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51. Measurements of the branching fractions ofΛc+→pηandΛc+→pπ0decays at Belle

Author

Jyoti Prakash Biswal, S. Eidelman, P. Pakhlov, P. Goldenzweig, S. Cunliffe, S. Sandilya, M. Sumihama, Martin Florian Bessner, Motoki Iwasaki, M. C. Chang, M. Nakao, H. Park, A. Bozek, D. Epifanov, Soumya D. Mohanty, S-H Park, A. Ishikawa, B. H. Kim, Doyen Sahoo, E. Wang, T. Pang, M. Takizawa, D. Y. Kim, C. Z. Yuan, R. Mizuk, D. M. Asner, F. Di Capua, T. K. Pedlar, Y. Sakai, A. Chen, I. Adachi, K. Hayasaka, A. Bobrov, H. E. Cho, R. B. Garg, B. Bhuyan, B. G. Fulsom, J-G Shiu, G.V. Russo, K. Lieret, T. E. Browder, Y-J Kwon, Florian Urs Bernlochner, Z. P. Zhang, J. K. Ahn, A. Korobov, L. Nayak, W-S Hou, E. Prencipe, Zhulanov, R. Dhamija, L. E. Piilonen, G. Pakhlova, Shebalin, Alexei Kuzmin, T. Aushev, John Yelton, C.-L. Hsu, R. Kroeger, M. E. Sevior, I. S. Lee, R. Ayad, P. Krizan, M. Uchida, L. K. Li, Phillip Urquijo, Y. Yusa, C. Sharma, Peter Kodys, W. W. Jacobs, M. Campajola, S. Uehara, Shih-Chang Lee, T. Ferber, G. Schnell, T. Iijima, T. Uglov, C. W. Joo, K. Tanida, Y. Kato, D. Ferlewicz, Zhilich, D. Liventsev, E. Solovieva, S. Nishida, Zdenek Dolezal, G. De Nardo, M. Niiyama, Y. Iwasaki, H. Ono, T. Matsuda, Y. B. Li, A. B. Kaliyar, M. T. Hedges, S. Das, G. Karyan, T. Konno, K. Lalwani, T. Kuhr, G. S. Varner, B. Shwartz, Seongbae Yang, J. V. Bennett, Y. Tao, S. Uno, C. Schwanda, H. Kichimi, T. Mori, H. Aihara, A. Vossen, J. Schueler, R. Van Tonder, N. Rout, A. K. Giri, Yk Kim, F. Tenchini, T. Podobnik, T. Sumiyoshi, M. Shapkin, K. Kumara, A. Natochii, M. Masuda, K. Inami, Savinov, E. Won, R. Itoh, B. G. Cheon, E.-J. Jang, M. Röhrken, K. Chilikin, W. Sutcliffe, Y. Onuki, Z. S. Stottler, A. Garmash, A. Rostomyan, P. Wang, Zhukova, Seema Bahinipati, T. V. Dong, T. Sanuki, T. Bilka, SX Li, P. Krokovny, L. Cao, Y. Choi, M. Z. Wang, K. Kinoshita, K. Gudkova, X. P. Xu, K. H. Kang, K. Cho, Popov, L. Santelj, Sudhanwa Patra, K. Trabelsi, C. H. Li, Ya-Qiu Jin, S. Korpar, R. Pestotnik, C. P. Shen, Seok Kim, N. Dash, A. Sangal, P. K. Behera, D. Matvienko, Mukesh Kumar, H. Hayashii, Gaur, O. Hartbrich, Babu, M. Merola, K. Senyo, J. H. Yin, C. H. Kim, T. Kawasaki, S. Jia, K. T. Kim, W. B. Yan, C. Hadjivasiliou, Z. Natkaniec, B. Golob, O. Grzymkowska, C. H. Wang, S. Paul, L. Li Gioi, Felix Metzner, N. K. Nisar, H. Ye, Bhardwaj, J. S. Lange, K. Uno, K. K. Joo, S. Pardi, Bruce Yabsley, D. Cinabro, G. Inguglia, Somnath Choudhury, J. Libby, E. Kovalenko, Y. Seino, M. T. Prim, and Shoichi Watanuki

Subjects
Quark, Physics, Particle physics, Luminosity (scattering theory), 010308 nuclear & particles physics, Branching fraction, Branching (polymer chemistry), 01 natural sciences, law.invention, KEKB, law, 0103 physical sciences, Invariant mass, 010306 general physics, Collider
Abstract

We report measurements of the branching fractions of singly Cabibbo-suppressed decays Λc+→pη and Λc+→pπ0 using the full Belle data sample corresponding to an integrated luminosity of 980.6 fb-1. The data were collected by the Belle detector at the KEKB e+e- asymmetric energy collider. A clear Λc+ signal is seen in the invariant mass distribution of pη. The fitted number of signal events of the Λc+→pη process is 7734±263; from this, we measure the ratio of branching fractions B(Λc+→pη)/B(Λc+→pK-π+)=[2.258±0.077(stat)±0.122(syst)]×10-2, from which we infer the branching fraction B(Λc+→pη)=[1.42±0.05(stat)±0.11(syst)]×10-3. In addition, no significant signal for Λc+→pπ0 is found, so an upper limit on the branching fraction of B(Λc+→pπ0)

Published
2021

52. Erratum: Measurement of the CKM matrix element |Vcb| from B0→D*−ℓ+νℓ at Belle [Phys. Rev. D 100 , 052007 (2019)]

Author

R. B. Garg, B. Bhuyan, J-G Shiu, Andrey Sokolov, V. Savinov, H Ye, K. Nishimura, K. Inami, D. Epifanov, M. Z. Wang, L. Li Gioi, D. Červenkov, J. Haba, S. H. Kim, S. Sandilya, Tao Luo, K. Tanida, V. Gaur, H. Hayashii, S. Pardi, C. H. Kim, Semen Eidelman, G. Schnell, T. Iijima, Victoria Zhukova, Florian Urs Bernlochner, M. Starič, A. K. Giri, A. Chen, I. Adachi, BG Cheon, J. MacNaughton, Jihwa Lee, M Iwasaki, D. Matvienko, Y Choi, S. C. Lee, M. Bračko, V. Chekelian, Zhiqing Zhang, Chunjie Wang, F. Tenchini, S. Uno, DY Kim, M. Salehi, Pavel Krokovny, S. Al Said, J. Biswal, M. Campajola, GB Mohanty, M. T. Hedges, M. Masuda, V.N. Zhilich, D. Ferlewicz, D Cinabro, Samo Korpar, T. Sumiyoshi, S Choudhury, G. Bonvicini, B. K. Pal, K. Trabelsi, Kevin Varvell, Y. Iwasaki, J. Kahn, C. Schwanda, J. E. Fast, C. P. Shen, K. Senyo, J. F. Strube, K. T. Kim, P. Pakhlov, E. Waheed, D. Dossett, Vikas Bansal, V. Babu, P. Wang, O. Schneider, A. Vinokurova, S. K. Choi, T. Sanuki, Phillip Urquijo, T. Mori, K. Miyabayashi, I. Badhrees, M Merola, Y. Usov, V.E. Shebalin, M. Nayak, Y. Sakai, H Aihara, C. H. Li, G. Russo, H. Park, S-H Park, R. Pestotnik, Samo Stanič, T. Uglov, D. M. Asner, S. Nishida, T. Bilka, K. Hayasaka, M. Takizawa, K Kinoshita, K. Lieret, R. Mizuk, R. Ayad, K. Cho, Z. S. Stottler, G. Varner, Z. Doležal, Eunil Won, K. Chilikin, Z. Natkaniec, E. Prencipe, Y-J Kwon, Y. Jin, C. Beleño, R. Kulasiri, S. Jia, Y. Seino, M. T. Prim, M. E. Sevior, P. Goldenzweig, O. Grzymkowska, G. Pakhlova, TE Browder, G. Inguglia, S. Paul, P. Chang, C.-L. Hsu, H. Ono, Peter Kodys, W. W. Jacobs, E. Solovieva, T. Kuhr, S. Di Carlo, Y. Unno, G. Karyan, M. Uchida, L. K. Li, Leo Piilonen, D. Joffe, Tagir Aushev, Seongbae Yang, A. Vossen, A. Rostomyan, S. Cunliffe, B. G. Fulsom, O. Seon, Frank Simon, Vladimir Popov, R. Mussa, P. C. Lu, H. B. Jeon, A. Ishikawa, M. Nakao, P. Križan, D. Kotchetkov, S Ogawa, T. Kawasaki, R. Kroeger, D. Liventsev, B. Shwartz, K. Adamczyk, W. S. Hou, Alexei Kuzmin, A. B. Kaliyar, J. Schueler, A. Bozek, H. Atmacan, Felix Metzner, B. Golob, A. Garmash, N. K. Nisar, J. S. Lange, K. K. Joo, Yang Li, T. V. Dong, K. J. Nath, T. Hara, Y. Yusa, M. Niiyama, J. Libby, I. Nakamura, H. Miyata, A. Bobrov, H. E. Cho, and P Behera

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Cabibbo–Kobayashi–Maskawa matrix, 0103 physical sciences, Element (category theory), 010303 astronomy & astrophysics, 01 natural sciences, Vertical bar
Published
2021

53. Observation of Beam Spin Asymmetries in the Process ep→e′π+π−X with CLAS12

Author

G. Niculescu, D. Bulumulla, G. Ciullo, Aditya R. Khanal, A. El Alaoui, S. Niccolai, E. L. Isupov, D. S. Carman, F. X. Girod, Nikos Sparveris, K. A. Griffioen, D. G. Ireland, V. I. Mokeev, M. Contalbrigo, V. Crede, Nicholas Zachariou, J. C. Carvajal, Sung-Sik Lee, X. Wei, S. Boiarinov, Andrea Bianconi, P. Lenisa, C. Dilks, Fatiha Benmokhtar, O. Soto, T. B. Hayward, M. Osipenko, R. Paremuzyan, L. Marsicano, Maxime Defurne, B. A. Clary, Latifa Elouadrhiri, A. Movsisyan, N. Tyler, N. Markov, P. L. Cole, N. Dashyan, K. Hicks, I. J. D. MacGregor, S. Strauch, D. I. Glazier, V. P. Kubarovsky, Michael Paolone, Krishna Neupane, H. Hakobyan, F. Bossu, R. Tyson, J. Ritman, Eugene Pasyuk, R. De Vita, D. Marchand, H. S. Jo, H. Avakian, Eric Voutier, L. Lanza, S. Diehl, C. Salgado, A. A. Golubenko, H. Atac, H. Voskanyan, G. Costantini, W. J. Briscoe, L. Barion, S. E. Kuhn, M. Hattawy, A. Vossen, M. Guidal, A. D'Angelo, Dustin Keller, M Ehrhart, P. Naidoo, T. Chetry, D. P. Watts, P. Chatagnon, Y. Prok, U. Shrestha, Michael Wood, F. Sabatié, M. Holtrop, Chaden Djalali, L. El Fassi, V. Mascagna, G. Gavalian, K. Hafidi, A. Filippi, B. A. Raue, Luciano Pappalardo, C. Ayerbe Gayoso, I. Bedlinskiy, Michael Dugger, W. Phelps, G. Angelini, P. Rossi, K. Wei, S. Joosten, S. Fegan, M. Leali, A. Celentano, R. W. Gothe, P. Nadel-Turonski, M. Khachatryan, N. A. Baltzell, K. Livingston, Alessandro Rizzo, Axel Schmidt, T. R. O'Connell, William Brooks, I. I. Strakovsky, F. Hauenstein, A. Kim, L. Venturelli, Jie Zhang, Y. Gotra, Z. E. Meziani, A. Deur, B. Yale, E.P. Segarra, S. Nanda, A. Kripko, T. A. Forest, S. Stepanyan, Y. G. Sharabian, M. Ripani, R. Dupré, M. Bondì, M. Battaglieri, O. Pogorelko, J. Rowley, Volker D. Burkert, A. S. Biselli, A. Hobart, S. Adhikari, B. McKinnon, M. Mirazita, Gerard Gilfoyle, D. Sokhan, M. Arratia, Hovanes Egiyan, C. Munoz Camacho, M. Ungaro, K. Joo, A. Thornton, and W. Kim

Subjects
Quark, Physics, Spectrometer, Proton, Nuclear Theory, General Physics and Astronomy, Deep inelastic scattering, 01 natural sciences, Gluon, Nuclear physics, 0103 physical sciences, Cathode ray, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Beam (structure), Spin-½
Abstract

The observation of beam spin asymmetries in two-pion production in semi-inclusive deep inelastic scattering off an unpolarized proton target is reported for the first time. The data presented here were taken in the fall of 2018 with the CLAS12 spectrometer using a 10.6 GeV longitudinally spin-polarized electron beam delivered by CEBAF at JLab. The measured asymmetries provide the first observation of a signal that can be used to extract the PDF $e(x)$ in a collinear framework and the helicity-dependent two-pion fragmentation function $G_1^\perp$.

Published
2021

54. Measurement of branching fraction and search for CP violation in B→ϕϕK

Author

G. Schnell, S. Das, K. Tanida, W. B. Yan, Jyoti Prakash Biswal, Z. J. Liptak, J. Wiechczynski, K. Hayasaka, A. Bobrov, M. Uchida, P. Goldenzweig, V. Gaur, A. B. Kaliyar, S. Cunliffe, S. Sandilya, L. K. Li, Y. Guan, M. Nakao, J. Schueler, Motoki Iwasaki, C. W. Park, E. Won, J. G. Shiu, D. Liventsev, E. Wang, M. Starič, M. Takizawa, L. E. Piilonen, M. E. Sevior, G. Pakhlova, P. Oskin, F. Di Capua, G. S. Varner, R. Kulasiri, C.-L. Hsu, M. Bračko, H. Atmacan, A. Sangal, S. Mohanty, R. Itoh, S. Jia, S.-J. Cho, M. Merola, A. Rostomyan, Victoria Zhukova, P. Wang, T. Matsuda, Z. Doležal, Y. Onuki, Z. P. Zhang, C. Sharma, Peter Kodys, W. W. Jacobs, K. Gudkova, J. H. Yin, O. Grzymkowska, C. H. Wang, A. Chen, J. Libby, G. De Nardo, L. Li Gioi, J. F. Strube, Kohei Ogawa, Seok Kim, V. M. Aulchenko, A. Vinokurova, Y. B. Li, L. Nayak, V. Babu, T. Aushev, Rahul Kumar, G. Karyan, Frank Simon, H. Ye, A. Natochii, B. Golob, I. Adachi, F. Tenchini, K. Inami, P. Krokovny, Vladimir Popov, Kevin Varvell, N. K. Nisar, T. Podobnik, Shih-Chang Lee, T. Ferber, T. Sumiyoshi, S. Al Said, K. H. Kang, K. Cho, Y. Seino, J. Li, M. T. Prim, T. J. Moon, Sudhanwa Patra, A. K. Giri, Shoichi Watanuki, D. Cinabro, T. Konno, Y. Tao, H. Aihara, Y. Usov, T. Sanuki, K. Senyo, B. Shwartz, Y. Sakai, S. Halder, T. Bilka, M. Masuda, G. B. Mohanty, B. H. Kim, Yongsun Kim, M. Shapkin, K. Lalwani, S. Uno, C. Schwanda, M. Röhrken, Mukesh Kumar, S. K. Choi, K. Chilikin, Somnath Choudhury, E. Prencipe, H. Hayashii, S. Pardi, C. H. Kim, S. Ogawa, N. Gabyshev, D. Červenkov, E. Solovieva, Y. Unno, M. Z. Wang, K. Kinoshita, M. Nayak, X. P. Xu, Martin Florian Bessner, R. Pestotnik, D. Kotchetkov, Bruce Yabsley, R. Mizuk, Ya-Qiu Jin, D. M. Asner, R. Dhamija, C. MacQueen, A. J. Schwartz, M. Campajola, V.N. Zhilich, K. Miyabayashi, Tariq Aziz, S. Eidelman, Seema Bahinipati, T. V. Dong, Y. Choi, V. Bhardwaj, T. K. Pedlar, R. Mussa, H. B. Jeon, B. G. Cheon, A. Ishikawa, H. Park, A. Bozek, S. Korpar, N. Dash, P. Križan, S. Nishida, Doyen Sahoo, K. Kumara, X. L. Wang, V. Chekelian, Z. S. Stottler, K. K. Joo, R. Van Tonder, Seokhee Park, B. G. Fulsom, T. E. Browder, D. Y. Kim, V. Savinov, C. Hadjivasiliou, S. E. Vahsen, Y. J. Kwon, N. Rout, A. Garmash, K. Adamczyk, G.V. Russo, W. S. Hou, V. Vorobyev, and P. K. Behera

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, media_common.quotation_subject, Resonance, 01 natural sciences, Asymmetry, law.invention, KEKB, law, 0103 physical sciences, CP violation, 010306 general physics, Collider, media_common
Abstract

We report the measurement of branching fractions and CP-violation asymmetries in B→φφK decays based on a 711 fb-1 data sample containing 772×106 BB¯ events. The data were recorded at the I(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. For B+→φφK+, the branching fraction and CP-violation asymmetry measured below the ηc threshold (mφφ

Published
2021

55. Evidence for X(3872)→J/ψπ+π− Produced in Single-Tag Two-Photon Interactions

Author

R. Mussa, G.V. Russo, A. Ishikawa, W. S. Hou, Y. Seino, S. Jia, G. Inguglia, T. Matsuda, M. Nakao, C. MacQueen, B. Bhuyan, P. Chang, P. Križan, Somnath Choudhury, G. Bonvicini, Iki Adachi, A. Vinokurova, J. G. Shiu, V. Savinov, M. Campajola, S. Pardi, Doo Young Kim, H. Aihara, A. B. Kaliyar, O. Hartbrich, J. Kahn, C.-L. Hsu, J. Schueler, Y. Teramoto, Bruce Yabsley, D. Liventsev, B. H. Kim, J. Libby, D. M. Asner, K. Hayasaka, Rakesh Kumar, Peter Kodys, M. T. Prim, Takeo Kawasaki, V. Gaur, W. W. Jacobs, K. H. Kang, V.N. Zhilich, Y. Kato, W. Sutcliffe, A. Sangal, X. L. Wang, T. Uglov, V. Chekelian, G. B. Mohanty, S. Sandilya, T. Mori, G. Karyan, S. Cunliffe, K. Miyabayashi, G. Varner, M. Shapkin, Y. Usov, R. Van Tonder, M. C. Chang, A. K. Giri, M. Takizawa, R. Ayad, K. Cho, Jyoti Prakash Biswal, G. De Nardo, M. T. Hedges, T. K. Pedlar, N. K. Nisar, M. Iwasaki, Pavel Krokovny, K. Senyo, A. Garmash, M. Masuda, G. Schnell, T. Iijima, J. S. Lange, M. Starič, T. Bilka, Semen Eidelman, E. Nakano, Vladimir Zhulanov, R. Kroeger, M. Watanabe, B. G. Cheon, T. E. Browder, T. V. Dong, E. Won, R. Pestotnik, M. E. Sevior, I. S. Lee, T. D. Kimmel, A. Kuzmin, E.-J. Jang, P. Goldenzweig, S. Ogawa, E. Prencipe, L. K. Li, C. W. Joo, U. Tamponi, Shih-Chang Lee, T. Kuhr, Tao Luo, S.-J. Cho, K. Chilikin, K. Sumisawa, Daniel Greenwald, F. Tenchini, Y. Iwasaki, Y. J. Kwon, J. H. Yin, C. Kiesling, Seongbae Yang, H. Ono, C. Beleño, E. Waheed, N. Rout, V. Vorobyev, H. Miyata, T. J. Moon, Prafulla Kumar Behera, H. Hayashii, B. G. Fulsom, E. Wang, T. Podobnik, T. Sumiyoshi, H. Park, A. Bozek, D. Matvienko, M. Hernandez Villanueva, M. Merola, Y. Jin, C. H. Wang, S. Paul, H. Kichimi, S. Al Said, Martin Ritter, Tagir Aushev, V. Zhukova, Y. Onuki, Y. Unno, J. Bennett, Z. P. Zhang, H. Ye, M. Bračko, M. Z. Wang, K. Kinoshita, M. Nayak, T. Sanuki, S. Korpar, Saraju P. Mohanty, Seok Kim, D. Kotchetkov, T. Hara, M. Mrvar, Yongsun Kim, H. Atmacan, K. K. Joo, A. Chen, V. Babu, K. Lalwani, Dipak Kumar Sahoo, S. Uno, C. Schwanda, D. Cinabro, H. Nakazawa, Rocky Bala Garg, T. Ferber, Sadaharu Uehara, R. Kulasiri, Phillip Urquijo, Kohei Ogawa, A. Natochii, M. Sumihama, K. Inami, Y. B. Li, Y. Choi, V. Popov, L. Santelj, C. Hadjivasiliou, Y. Sakai, N. Gabyshev, D. Červenkov, G. Pakhlova, L. Li Gioi, P. L. Wang, K. Kumara, M. Uchida, Z. S. Stottler, V. Bhardwaj, Z. Liptak, R. Itoh, A. Rostomyan, Seokhee Park, F. Di Capua, P. Pakhlov, S. Nishida, Z. Natkaniec, P. Lewis, Leo Piilonen, X. P. Xu, K. Lieret, E. Solovieva, John Yelton, Z. Doležal, J. B. Singh, S. K. Choi, V. Shebalin, and S. Patra

Subjects
Physics, Particle physics, Meson, General Physics and Astronomy, Virtual particle, Electron, State (functional analysis), 01 natural sciences, law.invention, KEKB, law, 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), 010306 general physics, Collider, X(3872)
Abstract

We report the first evidence for $X(3872)$ production in two-photon interactions by tagging either the electron or the position in the final state, exploring the highly virtual photon region. The search is performed in $e^+e^- \rightarrow e^+e^-J/\psi\pi^+\pi^-$, using 825 fb$^{-1}$ of data collected by the Belle detector operated at the KEKB $e^+e^-$ collider. We observe three $X(3872)$ candidates with an expected background of $0.11\pm 0.10$ events, with a significance of 3.2$\sigma$. We obtain an estimated value for $\tilde{\Gamma}_{\gamma\gamma}{\cal B}(X(3872)\rightarrow J/\psi\pi^+\pi^-$) assuming the $Q^2$ dependence predicted by a $c\bar{c}$ meson model, where $-Q^2$ is the invariant mass-squared of the virtual photon. No $X(3915)\rightarrow J/\psi\pi^+\pi^-$ candidates are found.

Published
2021

56. Measurements of the Branching Fractions of the Semileptonic Decays Ξ_{c}^{0}→Ξ^{-}ℓ^{+}ν_{ℓ} and the Asymmetry Parameter of Ξ_{c}^{0}→Ξ^{-}π^{+}

Author

Y B, Li, C P, Shen, I, Adachi, K, Adamczyk, H, Aihara, S, Al Said, D M, Asner, T, Aushev, R, Ayad, V, Babu, P, Behera, J, Bennett, M, Bessner, V, Bhardwaj, B, Bhuyan, T, Bilka, J, Biswal, G, Bonvicini, A, Bozek, M, Bračko, T E, Browder, M, Campajola, D, Červenkov, M-C, Chang, A, Chen, B G, Cheon, K, Chilikin, K, Cho, S-J, Cho, S-K, Choi, Y, Choi, S, Choudhury, D, Cinabro, S, Cunliffe, S, Das, N, Dash, G, De Nardo, R, Dhamija, F, Di Capua, T V, Dong, S, Eidelman, D, Epifanov, T, Ferber, B G, Fulsom, R, Garg, V, Gaur, N, Gabyshev, A, Garmash, A, Giri, P, Goldenzweig, O, Grzymkowska, K, Gudkova, C, Hadjivasiliou, O, Hartbrich, K, Hayasaka, H, Hayashii, M, Hernandez Villanueva, C-L, Hsu, A, Ishikawa, R, Itoh, M, Iwasaki, Y, Iwasaki, W W, Jacobs, S, Jia, Y, Jin, C W, Joo, K K, Joo, K H, Kang, G, Karyan, Y, Kato, H, Kichimi, C H, Kim, D Y, Kim, K-H, Kim, S H, Kim, K, Kinoshita, P, Kodyš, T, Konno, A, Korobov, S, Korpar, E, Kovalenko, P, Križan, R, Kroeger, P, Krokovny, T, Kuhr, M, Kumar, R, Kumar, K, Kumara, A, Kuzmin, Y-J, Kwon, K, Lalwani, J S, Lange, I S, Lee, S C, Lee, C H, Li, L K, Li, L, Li Gioi, J, Libby, K, Lieret, D, Liventsev, M, Masuda, D, Matvienko, J T, McNeil, F, Metzner, R, Mizuk, G B, Mohanty, T J, Moon, T, Mori, R, Mussa, A, Natochii, L, Nayak, M, Nayak, M, Niiyama, N K, Nisar, S, Nishida, K, Nishimura, S, Ogawa, H, Ono, Y, Onuki, P, Pakhlov, G, Pakhlova, T, Pang, S, Pardi, H, Park, S, Patra, S, Paul, T K, Pedlar, R, Pestotnik, L E, Piilonen, T, Podobnik, V, Popov, E, Prencipe, M T, Prim, M, Röhrken, A, Rostomyan, N, Rout, G, Russo, D, Sahoo, Y, Sakai, S, Sandilya, L, Santelj, T, Sanuki, V, Savinov, G, Schnell, C, Schwanda, Y, Seino, K, Senyo, M, Shapkin, C, Sharma, J-G, Shiu, A, Sokolov, E, Solovieva, M, Starič, Z S, Stottler, M, Sumihama, U, Tamponi, K, Tanida, F, Tenchini, M, Uchida, S, Uehara, T, Uglov, K, Uno, S, Uno, Y, Usov, R, Van Tonder, G, Varner, A, Vinokurova, A, Vossen, C H, Wang, M-Z, Wang, P, Wang, X L, Wang, M, Watanabe, S, Watanuki, E, Won, X, Xu, W, Yan, S B, Yang, H, Ye, J H, Yin, C Z, Yuan, Z P, Zhang, V, Zhilich, and V, Zhukova

Abstract

Using data samples of 89.5 and 711 fb^{-1} recorded at energies of sqrt[s]=10.52 and 10.58 GeV, respectively, with the Belle detector at the KEKB e^{+}e^{-} collider, we report measurements of branching fractions of semileptonic decays Ξ_{c}^{0}→Ξ^{-}ℓ^{+}ν_{ℓ} (ℓ=e or μ) and the CP-asymmetry parameter of Ξ_{c}^{0}→Ξ^{-}π^{+} decay. The branching fractions are measured to be B(Ξ_{c}^{0}→Ξ^{-}e^{+}ν_{e})=(1.31±0.04±0.07±0.38)% and B(Ξ_{c}^{0}→Ξ^{-}μ^{+}ν_{μ})=(1.27±0.06±0.10±0.37)%, and the decay parameter α_{Ξπ} is measured to be 0.63±0.03±0.01 with much improved precision compared with the current world average. The corresponding ratio B(Ξ_{c}^{0}→Ξ^{-}e^{+}ν_{e})/B(Ξ_{c}^{0}→Ξ^{-}μ^{+}ν_{μ}) is 1.03±0.05±0.07, which is consistent with the expectation of lepton flavor universality. The first measured asymmetry parameter A_{CP}=(α_{Ξ^{-}π^{+}}+α_{Ξ[over ¯]^{+}π^{-}})/(α_{Ξ^{-}π^{+}}-α_{Ξ[over ¯]^{+}π^{-}})=0.024±0.052±0.014 is found to be consistent with zero. The first and the second uncertainties above are statistical and systematic, respectively, while the third ones arise due to the uncertainty of the Ξ_{c}^{0}→Ξ^{-}π^{+} branching fraction.

Published
2021

57. Convolutional Neural Networks and Their Activations: An Exploratory Case Study on Mounded Settlements

Author

Serban Vadineanu, Tuna Kalayci, Daniël M. Pelt, and K. Joost Batenburg

Subjects
deep learning, site detection, explainability, annotations, corona imagery, Archaeology, CC1-960, Electronic computers. Computer science, QA75.5-76.95
Abstract

Automating the detection and classification of archaeological features in remotely sensed imagery poses significant challenges due to image variability and the heterogeneity of archaeological objects, which traditional object-based solutions have struggled to fully address. However, recent advancements in deep learning offer promising avenues for overcoming these obstacles. Despite their widespread adoption, deep learning algorithms still face problems such as the lack of annotated data and the opacity of model decision-making processes. We address these challenges through an approach linking annotation scarcity and model explainability. We propose leveraging explainability techniques to not only gain insights into model decision-making processes but also to reduce annotation costs. Through a case study mapping ancient settlement mounds in Upper Mesopotamia, we apply three explainability methods to three widely-used deep learning architectures that were trained to recognize whether or not a site is present within an image. We then employ the output of the explainability methods to both delineate the sites’ boundaries, a more time-consuming process for a human expert, and to generate meaningful visual insights of the features found relevant by the networks for which we provide detailed interpretations. Additionally, we propose a new variant of an explainability method that produces site boundaries that are more consistent with the expert estimations than the existing solutions.

Published
2024
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58. Photoproduction of the f2(1270) Meson Using the CLAS Detector

Author

V. Mokeev, P. Eugenio, Vincent Mathieu, D. Heddle, R. A. Schumacher, M. Battaglieri, K. A. Griffioen, R. Paremuzyan, Laura Clark, L. Marsicano, L. Lanza, M. J. Amaryan, M Carver, G. Angelini, D. P. Watts, Gerard Gilfoyle, M. Osipenko, N. Gevorgyan, P. Lenisa, M. Contalbrigo, H. Egiyan, K. Livingston, R. Tyson, D. Sokhan, S. Stepanyan, I. J. D. MacGregor, F. X. Girod, S. Adhikari, Dustin Keller, F. Sabatié, B. McKinnon, G. Niculescu, G. Rosner, B. A. Clary, D. G. Ireland, V. Crede, D. Bulumulla, William Brooks, E. Munevar, Jie Zhang, T. B. Hayward, K. Hafidi, A. Filippi, W. Phelps, Z. E. Meziani, B. Yale, Aditya R. Khanal, L. Venturelli, M. Ehrhart, M. Khandaker, E. L. Isupov, Friedrich Klein, Alessandro Rizzo, A. Kim, Michael Paolone, S. Boiarinov, Andrea Bianconi, G. Ciullo, A. Pilloni, C. W. Kim, A. Celentano, R. W. Gothe, Y. Prok, C. E. Hyde, I. Bedlinskiy, A. El Alaoui, N. A. Baltzell, F. Bossu, T. Chetry, D. S. Carman, Nicholas Zachariou, H. S. Jo, U. Shrestha, J. C. Carvajal, H. Voskanyan, Z. W. Zhao, Fatiha Benmokhtar, Nikos Sparveris, X. Wei, W. J. Briscoe, O. Soto, V. Mascagna, Maxime Defurne, M. Holtrop, S. Joosten, S. Niccolai, D. Protopopescu, E. Voutier, Luciano Pappalardo, A. Movsisyan, R. De Vita, H. Hakobyan, O. Pogorelko, S. Strauch, J. Ritman, J. Rowley, A. I. Ostrovidov, P. Chatagnon, K. Wei, S. Diehl, C. Salgado, S. Fegan, H. Atac, Volker D. Burkert, C. Munoz Camacho, Eugene Pasyuk, A. S. Biselli, G. Gavalian, V. P. Kubarovsky, Krishna Neupane, M. Ripani, M. Hattawy, K. Hicks, N. Dashyan, Michael Dugger, Yordanka Ilieva, L. Barion, Barry Ritchie, R. Dupre, D. Marchand, M. Ungaro, G. V. Fedotov, Q. Huang, K. P. Adhikari, K. Joo, D. G. Jenkins, M. Leali, Axel Schmidt, I. I. Strakovsky, P. Nadel-Turonski, A. Deur, Mark W. Bondi, M. E. McCracken, N. Tyler, C. Djalali, A. D'Angelo, L. El Fassi, A. Kripko, Y. G. Sharabian, and P. L. Cole

Subjects
Quark, Physics, Spectrometer, Meson, High Energy Physics::Lattice, Nuclear Theory, Quark model, Detector, General Physics and Astronomy, Quantum number, 01 natural sciences, 7. Clean energy, Resonance (particle physics), Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

The quark structure of the f2(1270) meson has, for many years, been assumed to be a pure quark-antiquark (qq¯) resonance with quantum numbers JPC=2++. Recently, it was proposed that the f2(1270) is a molecular state made from the attractive interaction of two ρ mesons. Such a state would be expected to decay strongly to final states with charged pions due to the dominant decay ρ→π+π-, whereas decay to two neutral pions would likely be suppressed. Here, we measure for the first time the reaction γp→π0π0p, using the CEBAF Large Acceptance Spectrometer detector at Jefferson Lab for incident beam energies between 3.6 and 5.4 GeV. Differential cross sections, dσ/dt, for f2(1270) photoproduction are extracted with good precision due to low backgrounds and are compared to theoretical calculations.

Published
2021

59. Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs

Author

K. Park, V. P. Kubarovsky, Krishna Neupane, C. W. Kim, H. Avakian, H. Voskanyan, W. J. Briscoe, Dustin Keller, P. Eugenio, Michael Wood, K. Hafidi, G. Gavalian, L. Marsicano, A Hobart, V. Mokeev, F. X. Girod, R. A. Schumacher, M. Battaglieri, I. I. Strakovsky, R. W. Gothe, T. Chetry, M. J. Amaryan, F. Sabatié, K. Wei, S. Fegan, N. Markov, L. Guo, Alessandro Rizzo, K. A. Griffioen, Fatiha Benmokhtar, Gerard Gilfoyle, R. Paremuzyan, E. L. Isupov, A. Deur, S. Pisano, V. Crede, Ross Milner, O. Soto, P. Lenisa, M. Contalbrigo, C. Dilks, L. Lanza, M. Ungaro, T. A. Forest, C. Mullen, W. K. Brooks, M. Guidal, Z. W. Zhao, S. Stepanyan, N. A. Baltzell, M. Holtrop, T. B. Hayward, Friedrich Klein, Andrea Celentano, O. Pogorelko, J. Poudel, A. Filippi, Brian Raue, K. Hicks, K. Joo, D. Marchand, M. Osipenko, Luciano Pappalardo, K. L. Giovanetti, Hovanes Egiyan, M. Ripani, C. Munoz Camacho, A. D'Angelo, B. Yale, S. Adhikari, L. Venturelli, B. McKinnon, M. Ehrhart, D. G. Ireland, Tim O'Connell, I. Bedlinskiy, D. I. Glazier, W. Phelps, D. G. Jenkins, N. Tyler, M. Leali, L. El Fassi, C. Djalali, Volker D. Burkert, W. Kim, T. Mineeva, D. Heddle, R. De Vita, G. Ciullo, V. Mascagna, H. S. Jo, A. S. Biselli, M. Mirazita, D. Bulumulla, Y. Prok, D. S. Carman, G. Niculescu, B. S. Ishkhanov, E. Pasyuk, Aditya R. Khanal, X. Wei, R. G. Fersch, Andrea Bianconi, H. Atac, P. L. Cole, N. Dashyan, G. Angelini, P. Chatagnon, B. A. Clary, P. Rossi, M. Defurne, Michael Paolone, L. Barion, Axel Schmidt, Aurore Courtoy, K. Livingston, M. Khandaker, Jie Zhang, I. J. D. MacGregor, E. Golovatch, R. Dupre, Y. Ghandilyan, Q. Huang, E. Voutier, A. Vossen, A. El Alaoui, Y. Ilieva, Nicholas Zachariou, J. C. Carvajal, S. Strauch, D. P. Watts, F. Bossu, Nikolaos Sparveris, Dinko Pocanic, S. E. Kuhn, M. Hattawy, Y. G. Sharabian, S. Boiarinov, H. Hakobyan, J. Ritman, S. Diehl, C. Salgado, U. Shrestha, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and CLAS

Subjects
High Energy Physics::Lattice, Nuclear Theory, Hadron, parton: distribution function, General Physics and Astronomy, Parton, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Economica, higher-twist, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), electron: beam, Nuclear Experiment, dimension: 1, Physics, Quantum chromodynamics, deep inelastic scattering: semi-inclusive reaction, Settore FIS/04, nucleon, kinematics, Quarks and Gluons, helicity distributions, quark: valence, Nucleon, Jefferson Lab, Quark, Particle physics, polarization: longitudinal, FOS: Physical sciences, Socio-culturale, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Transversity Distributions, hadron: electroproduction, hadron: pair production, Pion, CLAS, Hadron Physics, quantum chromodynamics, 0103 physical sciences, ddc:530, 010306 general physics, High Energy Physics::Phenomenology, Ambientale, Deep inelastic scattering, spin: asymmetry: measured, Distribution function, Elementary Particles and Fields, QCD Dynamics, High Energy Physics::Experiment, pi: pair production, experimental results
Abstract

Physical review letters 126(6), 062002 (2021). doi:10.1103/PhysRevLett.126.062002, Published by APS, College Park, Md.

Published
2021

60. Measurement of time-dependent CP violation parameters in B0→KS0KS0KS0 decays at Belle

Author

R. Mizuk, C. Beleño, A. B. Kaliyar, L. Li Gioi, H. Miyata, Yongsun Kim, J. Li, J. Schueler, S. Uno, C. Schwanda, H. Ye, T. J. Moon, E. Won, A. K. Giri, K. Trabelsi, M. Masuda, G. B. Mohanty, K. Hayasaka, S. Pardi, L. Cao, M. Z. Wang, K. Kinoshita, S. Cunliffe, Seok Kim, Y. Guan, M. Shapkin, M. C. Chang, C.-L. Hsu, M. Takizawa, Y. Yusa, Z. P. Zhang, Peter Kodys, W. W. Jacobs, M. Röhrken, V. Babu, P. Goldenzweig, H. Ono, K. Chilikin, A. Garmash, Daniel Greenwald, G. Karyan, A. Sangal, G.V. Russo, T. Aushev, G. Schnell, C. MacQueen, H. Nakazawa, A. M. Bakich, J. E. Fast, B. G. Cheon, J. K. Ahn, S. Sandilya, L. E. Piilonen, G. Pakhlova, P. Oskin, R. Kulasiri, W. S. Hou, T. Ferber, M. Nayak, D. Matvienko, R. B. Garg, A. J. Schwartz, Z. Doležal, K. Sumisawa, M. Merola, Motoki Iwasaki, D. M. Asner, Alexei Kuzmin, D. Y. Kim, Ya-Qiu Jin, M. Starič, Y. Ushiroda, N. Gabyshev, D. Červenkov, B. G. Fulsom, Bruce Yabsley, P. K. Behera, V. Vorobyev, Jyoti Prakash Biswal, Seema Bahinipati, T. E. Browder, T. V. Dong, Y. Choi, Seokhee Park, L. Santelj, K. H. Kang, Y. Unno, R. Pestotnik, M. Campajola, T. Bilka, J. H. Yin, S. Korpar, Seongbae Yang, I. Adachi, K.-H. Kim, W. Sutcliffe, Y. Onuki, V. Gaur, W. B. Yan, H. Hayashii, O. Hartbrich, N. Dash, G. De Nardo, M. Mrvar, C. H. Kim, F. Tenchini, V. Savinov, E.-J. Jang, Z. Natkaniec, T. Podobnik, T. Sumiyoshi, M. Nakao, Rahul Kumar, U. Tamponi, B. Golob, C. Kiesling, S. Ogawa, N. K. Nisar, M. Hernandez Villanueva, R. Mussa, T. Morii, Victoria Zhukova, T. Higuchi, Vladimir Popov, J. G. Shiu, Martin Ritter, H. B. Jeon, J. S. Lange, T. Sanuki, J. MacNaughton, J. Libby, A. Ishikawa, V.E. Shebalin, Y. Iwasaki, Y. J. Kwon, A. Chen, S. Jia, S. Nishida, V.N. Zhilich, E. Wang, V. M. Aulchenko, Z. S. Stottler, P. Križan, K. K. Joo, R. Ayad, N. Rout, Phillip Urquijo, M. Bračko, Doyen Sahoo, Y. Sakai, S. K. Choi, K. Lieret, X. L. Wang, Y. B. Li, T. Uglov, K. Miyabayashi, Kohei Ogawa, C. H. Wang, Y. Seino, M. T. Prim, S. Paul, J. V. Bennett, T. Mori, H. Aihara, Shoichi Watanuki, K. Inami, K. Nishimura, V. Chekelian, D. Cinabro, C. Z. Yuan, V. V. Zhulanov, E. Solovieva, G. Inguglia, E. Prencipe, S. Eidelman, X. P. Xu, M. Rozanska, D. Kotchetkov, P. Pakhlov, Shih-Chang Lee, Sudhanwa Patra, Samo Stanič, H. Park, A. Bozek, V. Bhardwaj, K. Tanida, T. K. Pedlar, H. Kichimi, R. Kroeger, M. E. Sevior, I. S. Lee, T. Matsuda, G. Bonvicini, A. Vinokurova, P. Krokovny, K. Cho, M. Uchida, L. K. Li, D. Liventsev, G. S. Varner, A. Rostomyan, P. Wang, M. V. Purohit, K. Senyo, T. Kawasaki, and S. Al Said

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Zero (complex analysis), Resonance, 01 natural sciences, law.invention, Standard Model, KEKB, law, 0103 physical sciences, CP violation, 010306 general physics, Collider
Abstract

We measure the time-dependent $C\!P$ violation parameters in $B^{0} \to K^{0}_{S}K^{0}_{S}K^{0}_{S}$ decays using $772 \times 10^6$ $B {\mkern 1.5mu\overline{\mkern-1.5mu B \mkern-0.1mu}\mkern 0.1mu}$ pairs collected at the $\Upsilon (4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The obtained mixing-induced and direct $C\!P$ asymmetries are $-0.71 \pm 0.23~{\rm(stat)} \pm 0.05~{\rm(syst)}$ and $0.12 \pm 0.16~{\rm(stat)} \pm 0.05~{\rm(syst)}$, respectively. These values are consistent with the Standard Model predictions. The significance of $C\!P$ violation differs from zero by 2.5 standard deviations.

Published
2021

61. An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab

Author

Anthony W. Thomas, M. Battaglieri, R. De Vita, D. Marchand, Latifa Elouadrhiri, S. Habet, Hubert Spiesberger, P. Gueye, David Hamilton, Giovanni Salmè, A. Filippi, Pete Markowitz, D. Perera, G. Kalicy, M. Muhoza, N. Kalantarians, H. Atac, M. Khandaker, J. Xie, F. Sabatié, M. Mazouz, Ashot Gasparian, I.P. Fernando, V. Klimenko, T. A. Forest, D. McNulty, Z. E. Meziani, M. Boer, M. McCaughan, A. Asaturyan, J. P. Chen, V. Kozhuharov, S. Stepanyan, Simonetta Liuti, T. Patel, Alberto Accardi, M. Spata, Andrew Puckett, Andreas Metz, Salina Ali, V. Bellini, L. Barion, V. V. Berdnikov, Alexandre Camsonne, P. E. Reimer, M. Shabestari, P. Bisio, Simon Širca, T. Averett, J. Kim, Nikolaos Sparveris, M. Poelker, M. Spreafico, H. F. Ibrahim, Dipangkar Dutta, V. Bertone, Bogdan Wojtsekhowski, Ross Milner, H. Avakian, C. E. Hyde, P. M. King, Marc Vanderhaeghen, A. Somov, Yulia Furletova, Miha Mihovilovič, V. Tadevosyan, P. Sznajder, S. Migliorati, R. S. Beminiwattha, T. Chetry, M. Guidal, Olfred Hansen, T. Kutz, Z. W. Zhao, Barbara Pasquini, Eric Voutier, L. Lanza, M. J. Amaryan, J. R. M. Annand, Fatiha Benmokhtar, T. Gautam, H. Voskanyan, Richard Trotta, Ian L. Pegg, J. F. Owens, W. J. Briscoe, Jingyi Zhou, P. Valente, M. N. H. Rashad, Gordan Krnjaic, P. Lenisa, Elena Santopinto, Joseph Grames, M. Leali, S. Zhamkochyan, M. Caudron, Kai-Thomas Brinkmann, Elton Smith, L. Marsicano, Andrei Afanasev, Luciano Pappalardo, M. Carmignotto, Donal Day, L. Venturelli, Eugene Pasyuk, M. Ungaro, C. Peng, L. Causse, D. Hasell, G. Costantini, Douglas Higinbotham, N. D’Hose, J. Murphy, P. Chatagnon, R. Dupré, M. Bondì, Alexander Ilyichev, Matteo Rinaldi, P. Stoler, Brian Raue, G. N. Grauvogel, R. Santos Estrada, Kondo Gnanvo, K. Price, Q. Liu, S. Diehl, J. Nazeer, Y. G. Sharabian, X. Zheng, S. Niccolai, P. G. Blunden, J. Arrington, Riad Suleiman, J. Erler, S. Joosten, Andrea Bianconi, H.-S. Ko, P. L. Cole, Nilanga Liyanage, I. Albayrak, K. Joo, Jan C. Bernauer, F.-X. Girod, D. Gaskell, A. Kim, Juliette Mammei, A. Italiano, M. Hattawy, C. Ayerbe Gayoso, I. I. Strakovsky, M. Yurov, N. Randazzo, A. Deur, Wally Melnitchouk, H.-G. Zaunick, Michael Kohl, A. D'Angelo, E. Nardi, M. Paolone, C. Zorn, L. El Fassi, B. T. Kriesten, L. Darmé, M. Rathnayake, A. Shahinyan, Jie Zhang, Alessandro Rizzo, D. Flay, W. Xiong, H. Dutrieux, V. Sergeyeva, S. Zhang, E. R. Kinney, Hervé Moutarde, B. Dongwi, Axel Schmidt, Rolf Ent, S. Zhao, Volker D. Burkert, A. S. Tadepalli, A. S. Biselli, Tanja Horn, G. Niculescu, T. Cao, A. Celentano, P. Nadel-Turonski, Ethan Cline, J. Roche, B. Karky, M. Contalbrigo, H. Szumila-Vance, S. Fucini, O. Rondon-Aramayo, M. De Napoli, V. Mascagna, E. Fuchey, L. Cardman, G. Ciullo, Haiyan Gao, Cynthia Keppel, M. Ehrhart, A. Movsisyan, R. Novotny, A. Hobart, Sergio Scopetta, B. McKinnon, S. A. Wood, H. Mkrtchyan, M. Tiefenback, C. Munoz Camacho, Xinzhan Bai, R. Paremuzyan, B. Sawatzky, D. Sokhan, M. Suresh, Markus Diefenthaler, Z. Ye, Mauro Raggi, M. Kerver, Y. Roblin, A. Mkrtchyan, V. P. Kubarovsky, R. Capobianco, T. J. Hague, Dustin Keller, Sonny Mantry, Vladimir Khachatryan, Peter Schweitzer, Michael Wood, Maxime Defurne, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
cross-section, ratio, Photon, parton distributions, elastic scattering, Parton, polarized beam, Electron, Leptons Accelerators, Structure of Nucleons, 7. Clean energy, 01 natural sciences, Dark photon, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Positron, Economica, electromagnetic form-factors, virtual compton-scattering, generalized, squared 4-momentum transfers, lepton-flavor, violation, electron-proton, parity violation, pair production, Physics, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, Elastic scattering, Dark sector, JLab, dark photon, Settore FIS/04, lepton: flavor: violation, nucleon: generalized parton distribution, 3. Good health, High Energy Physics - Phenomenology, Elastic and deep inelastic Scattering, Nucleon, Jefferson Lab, Nuclear and High Energy Physics, nucleon: form factor: electromagnetic, FOS: Physical sciences, Socio-culturale, helium: target, Context (language use), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, PE2_2, PE2_1, deeply virtual Compton scattering, 0103 physical sciences, quantum chromodynamics, 010306 general physics, PE2_3, activity report, exchange: two-photon, electroweak interaction, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Ambientale, positron: beam, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], charge: asymmetry, Positron Beams, Physics::Accelerator Physics, proposal, High Energy Physics::Experiment
Abstract

Positron beams, both polarized and unpolarized, are identified as essential ingredients for the experimental programs at the next generation of lepton accelerators. In the context of the hadronic physics program at Jefferson Lab (JLab), positron beams are complementary, even essential, tools for a precise understanding of the electromagnetic structure of nucleons and nuclei, in both the elastic and deep-inelastic regimes. For instance, elastic scattering of polarized and unpolarized electrons and positrons from the nucleon enables a model independent determination of its electromagnetic form factors. Also, the deeply-virtual scattering of polarized and unpolarized electrons and positrons allows unambiguous separation of the different contributions to the cross section of the lepto-production of photons and of lepton-pairs, enabling an accurate determination of the nucleons and nuclei generalized parton distributions, and providing an access to the gravitational form factors. Furthermore, positron beams offer the possibility of alternative tests of the Standard Model of particle physics through the search of a dark photon, the precise measurement of electroweak couplings, and the investigation of charged lepton flavor violation. This document discusses the perspectives of an experimental program with high duty-cycle positron beams at JLab., Comment: 18 pages, 7 figures This version superseeds the previous version which scientific content was decomposed into several more elaborated articles. All of these articles will be collected in the EPJ A Topical Issue about "Positron beam and physics at Jefferson Lab (e+@Jlab)"

Published
2021

62. Search for lepton-flavor-violating tau-lepton decays to ℓγ at Belle

Author

J. Libby, D. M. Asner, K. Hayasaka, M. Bračko, B.A. Shwartz, E. Kovalenko, J. G. Shiu, M. Uchida, J. Biswal, M. Takizawa, Y. Seino, M. Starič, E. Prencipe, V. Bhardwaj, H. Nakazawa, M. T. Prim, Y. Jin, Phillip Urquijo, R. Kroeger, G. S. Varner, C.-L. Hsu, S. E. Vahsen, M. E. Sevior, Z. Doležal, P. Goldenzweig, V.N. Zhilich, Y. Kato, M. Sumihama, Y. B. Li, L. E. Piilonen, K. Trabelsi, C. MacQueen, R. Itoh, Y. Ushiroda, D. Epifanov, H. Hayashii, W. Sutcliffe, M. Campajola, K. Miyabayashi, A. Rostomyan, P. Oskin, E. Waheed, C. Sharma, Peter Kodys, W. W. Jacobs, B. G. Fulsom, D. Cinabro, L. Li Gioi, Tomoyuki Konno, Andrey Sokolov, Y. J. Kwon, Tagir Aushev, V. Zhukova, Y. Choi, G. Inguglia, M. Iwasaki, T. Podobnik, A. Korobov, M. Kumar, S. Uno, C. Schwanda, Y. Tao, H. Park, N. Rout, Y. Usov, R. Mizuk, Rocky Bala Garg, A. Bozek, M. Z. Wang, F. Di Capua, A. Frey, M. Röhrken, M. Niiyama, S.-J. Cho, V. Gaur, S. Nishida, Z. P. Zhang, X. L. Wang, S.-H. Park, J. Bennett, K. Tanida, Semen Eidelman, C. P. Shen, Seok Kim, Somnath Choudhury, S. Pardi, Dipak Kumar Sahoo, Sadaharu Uehara, T. Hara, Y. Unno, A. Sangal, G. B. Mohanty, Hiroaki Aihara, L. Nayak, V. Babu, A. Garmash, R. Van Tonder, Shih-Chang Lee, Y. Sakai, Samo Korpar, Steve K. Choi, Luka Santelj, R. Ayad, G. Schnell, S. Sandilya, T. Iijima, G. Pakhlova, P. Pakhlov, M. Merola, Y. Yusa, T. Ferber, C. H. Kim, F. Tenchini, A. K. Giri, A. Bobrov, D. Y. Kim, Bruce Yabsley, K. Senyo, D. Matvienko, D. Liventsev, C. Hadjivasiliou, V. Savinov, H. E. Cho, R. Pestotnik, Kohei Ogawa, M. Masuda, A. Natochii, T. Sumiyoshi, K. Inami, Iki Adachi, H. Ye, T. V. Dong, K. Matsuoka, K. Kumara, T. Kuhr, H. Kichimi, T. Uglov, E. Won, Z. S. Stottler, A. Ishikawa, K. Lieret, T. Sanuki, Felix Metzner, M. Nakao, G. Bonvicini, P. Križan, E. Wang, Jochen Dingfelder, W. B. Yan, K.-H. Kim, A. Vinokurova, O. Hartbrich, S. Cunliffe, O. Werbycka, M. Bessner, A. Kuzmin, M. Hernandez Villanueva, M. C. Chang, H. Atmacan, K. K. Joo, Y.-T. Lai, S. Ogawa, C. H. Wang, P. Krokovny, Rakesh Kumar, K. H. Kang, K. Cho, N. Gabyshev, D. Červenkov, N. K. Nisar, J. S. Lange, K. Uno, G.V. Russo, W. S. Hou, J. H. Yin, Florian Urs Bernlochner, C. Kiesling, N. Dash, E. Solovieva, S. Paul, A. Vossen, K. Nishimura, Frank Simon, Belle, Collaboration, Campajola, M., De Nardo, G., Di Capua, F., Merola, M., Pardi, S., Russo, G., and Et, Al.

Subjects
Nuclear and High Energy Physics, Particle physics, Physics beyond the Standard Model, QC770-798, +, 01 natural sciences, Nuclear and particle physics. Atomic energy. Radioactivity, 0103 physical sciences, Radiative transfer, ddc:530, 010306 general physics, Flavor, Physics, Luminosity (scattering theory), 010308 nuclear & particles physics, e, High Energy Physics::Phenomenology, −, e +-e − Experiments, Belle experiment, Standard Model (mathematical formulation), Full data, High Energy Physics::Experiment, Experiments, Lepton
Abstract

Charged lepton flavor violation is forbidden in the Standard Model but possible in several new physics scenarios. In many of these models, the radiative decays τ± → ℓ±γ (ℓ = e, μ) are predicted to have a sizeable probability, making them particularly interesting channels to search at various experiments. An updated search via τ± → ℓ±γ using full data of the Belle experiment, corresponding to an integrated luminosity of 988 fb−1, is reported for charged lepton flavor violation. No significant excess over background predictions from the Standard Model is observed, and the upper limits on the branching fractions, $$ \mathcal{B} $$ B (τ± → μ±γ) ≤ 4.2 × 10−8 and $$ \mathcal{B} $$ B (τ± → e±γ) ≤ 5.6 × 10−8, are set at 90% confidence level.

Published
2021

63. Measurement of the proton spin structure at long distances

Author

P. Eugenio, J. Brock, N. Dashyan, I. Bedlinskiy, S. Choi, P. Nadel-Turonski, A. Hobart, M. Defurne, S. E. Kuhn, Latifa Elouadrhiri, P. Chatagnon, M. Ripani, C. D. Keith, D. Bulumulla, Aditya R. Khanal, S. Adhikari, B. McKinnon, T. Holmstrom, V. Mokeev, G. V. Fedotov, H. S. Jo, L. Guo, Alessandro Rizzo, Andrea Bianconi, L. Barion, M. Mirazita, K. Livingston, M. Hattawy, N. Markov, G. Rosner, Simon Širca, S. Fegan, Y. Ghandilyan, Jie Zhang, P. Bosted, Michael Paolone, C. Carlin, M. Guidal, M. L. Seely, E. Pasyuk, D. P. Watts, F. Bossu, Laura Clark, S. Niccolai, N. Guler, M. Holtrop, B. Yale, R. A. Schumacher, P. Rossi, W. Phelps, V. Mascagna, S. Joosten, Axel Schmidt, Alexandre Deur, Luciano Pappalardo, Nikolaos Sparveris, V. Crede, I. I. Strakovsky, W. Kim, Fatiha Benmokhtar, M. Ehrhart, D. I. Glazier, V. P. Kubarovsky, T. A. Forest, O. Pogorelko, Z. W. Zhao, J. Rowley, S. Stepanyan, A. I. Ostrovidov, K. Park, Krishna Neupane, R. De Vita, A. El Alaoui, Y. Ilieva, Nicholas Zachariou, D. G. Ireland, C. W. Kim, H. Avakian, C. Mullen, W. K. Brooks, A. Kripko, Andrea Celentano, Volker D. Burkert, A. S. Biselli, J. C. Carvajal, V. Sulkosky, H. Atac, Karl Slifer, M. Leali, F. Sabatié, L. Venturelli, Y. G. Sharabian, X. Zheng, M. Bondì, H. Voskanyan, P. Lenisa, W. J. Briscoe, I. J. D. MacGregor, M. Contalbrigo, S. K. Phillips, T. Mineeva, T. B. Hayward, Friedrich Klein, Brian Raue, J. Poudel, N. Tyler, C. Djalali, G. Ciullo, M. Osipenko, Y. Prok, D. S. Carman, X. Wei, K. A. Griffioen, E. Voutier, Dustin Keller, S. Strauch, L. Lanza, R. W. Gothe, Michael Wood, T. Chetry, K. Hafidi, R. Dupre, M. Battaglieri, Gerard Gilfoyle, E. L. Isupov, V. A. Drozdov, S. Boiarinov, H. Kang, U. Shrestha, F.-X. Girod, K. P. Adhikari, H. Hakobyan, J. Ritman, S. Diehl, C. Salgado, R. G. Fersch, M. Ungaro, E. Long, J. P. Chen, D. Heddle, P. L. Cole, D. G. Meekins, A. D'Angelo, K. Hicks, L. El Fassi, K. Joo, M. Khandaker, M. J. Amaryan, A. Filippi, K. L. Giovanetti, Larry Weinstein, L. Marsicano, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and CLAS

Subjects
polarizabilities, Photon, Proton, High Energy Physics::Lattice, Nuclear Theory, General Physics and Astronomy, polarized target, polarized beam, 01 natural sciences, 7. Clean energy, 010305 fluids & plasmas, High Energy Physics - Experiment, Theoretical Nuclear Physics, Experimental Nuclear Physics, High Energy Physics - Experiment (hep-ex), effective field theory, Economica, Proton spin crisis, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Experimental particle Physics, order, Nuclear Experiment (nucl-ex), Nuclear Experiment, Spin-½, Quantum chromodynamics, Physics, Settore FIS/04, nucleon, virtual compton-scattering, chiral perturbation-theory, sum-rule, moments, evolution, sum rule, kinematics, Quantum electrodynamics, nuclear matter, Nucleon, nucleon: structure, Strong interaction, FOS: Physical sciences, Socio-culturale, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], p: spin, PE2_2, momentum transfer: low, PE2_1, CLAS, 0103 physical sciences, quantum chromodynamics, ddc:530, 010306 general physics, PE2_3, quark gluon, Coupling constant, nuclear force, scattering, Ambientale, Physics::Accelerator Physics, nucleon: spin, High Energy Physics::Experiment, experimental results
Abstract

Measuring the spin structure of protons and neutrons tests our understanding of how they arise from quarks and gluons, the fundamental building blocks of nuclear matter. At long distances the coupling constant of the strong interaction becomes large, requiring non-perturbative methods to calculate quantum chromodynamics processes, such as lattice gauge theory or effective field theories. Here we report proton spin structure measurements from scattering a polarized electron beam off polarized protons. The spin-dependent cross-sections were measured at large distances, corresponding to the region of low momentum transfer squared between 0.012 and 1.0 GeV$^2$. This kinematic range provides unique tests of chiral effective field theory predictions. Our results show that a complete description of the nucleon spin remains elusive, and call for further theoretical works, e.g. in lattice quantum chromodynamics. Finally, our data extrapolated to the photon point agree with the Gerasimov-Drell-Hearn sum rule, a fundamental prediction of quantum field theory that relates the anomalous magnetic moment of the proton to its integrated spin-dependent cross-sections., Published version. 10 pages, 5 figures. 20 pages of supplementary material (data tables and a figure)

Published
2021

64. Measurements of branching fractions and asymmetry parameters of $ {\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0} $, $ {\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0} $, and $ {\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -} $ decays at Belle

Author

Tagir Aushev, M. Bračko, V. Zhukova, Y. Onuki, G. De Nardo, E. Prencipe, G. Schnell, T. Iijima, Felix Metzner, F. Tenchini, H. Park, A. Bozek, V.M. Aulchenko, T. Sumiyoshi, T. Kuhr, V.N. Zhilich, Y. Kato, K. K. Joo, H. Miyata, Prafulla Kumar Behera, K. Miyabayashi, R. Mizuk, Andrey Sokolov, Iki Adachi, T. Podobnik, H. E. Cho, G. B. Mohanty, Y. Yusa, L. Nayak, V. Babu, Semen Eidelman, R. Mussa, C. MacQueen, S. Cunliffe, A. Bobrov, A. Ishikawa, M. Nakao, M. Niiyama, P. Križan, A. Garmash, V. Savinov, R. Dhamija, D. Liventsev, D. Epifanov, M. C. Chang, T. Ferber, T. Bilka, N. K. Nisar, M. Iwasaki, B. G. Cheon, Shih-Chang Lee, S. Pardi, M. Watanabe, C.-L. Hsu, Y. Iwasaki, J. S. Lange, K. Uno, L. E. Piilonen, M. Campajola, T. E. Browder, T. Uglov, P. Oskin, Y. J. Kwon, C. H. Kim, R. Ayad, K. Chilikin, K. Trabelsi, J. Li, C. Sharma, Peter Kodys, Seema Bahinipati, S. Nishida, Y. Choi, W. W. Jacobs, V. Popov, Z. P. Zhang, V. Gaur, S. K. Choi, H. Hayashii, N. Rout, M. Bessner, K.-H. Kim, J. Biswal, L. K. Li, D. Y. Kim, Tomoyuki Konno, M. Nayak, K. Flood, E. Won, J. H. Yin, V. Chekelian, Bruce Yabsley, G. Karyan, Seongbae Yang, M. Z. Wang, K. Kinoshita, S. Das, S.-J. Cho, C. H. Wang, S.-H. Park, O. Werbycka, R. Pestotnik, A. K. Giri, S. Paul, J. Bennett, S. Jia, R. Van Tonder, G. Pakhlova, S. Al Said, T. Matsuda, H. Ono, M. Masuda, J. Libby, D. M. Asner, K. Hayasaka, S. Sandilya, H. Ye, S. Patra, C. Z. Yuan, Dipak Kumar Sahoo, J. T. McNeil, G. Bonvicini, C. P. Shen, G.V. Russo, Seok Kim, E. Kovalenko, T. V. Dong, M. Starič, W. S. Hou, J. G. Shiu, Yongsun Kim, K. Lalwani, Y. Seino, Y. Unno, O. Hartbrich, S. Uno, C. Schwanda, M. Sumihama, P. Krokovny, Y. Jin, Rocky Bala Garg, M. T. Prim, Phillip Urquijo, Kohei Ogawa, M. Takizawa, L. Li Gioi, A. Korobov, A. Kuzmin, Sadaharu Uehara, A. Natochii, K. Cho, R. Kroeger, D. Cinabro, Y. B. Li, K. Inami, John Yelton, Z. Doležal, S. Ogawa, H. Aihara, Y. Usov, M. E. Sevior, H. Kichimi, P. Goldenzweig, Somnath Choudhury, N. Gabyshev, D. Červenkov, A. Chen, A. Sangal, M. Merola, E. Waheed, K. Senyo, K. Tanida, D. Matvienko, G. S. Varner, R. Itoh, S. S. Tang, A. Rostomyan, P. L. Wang, B. G. Fulsom, K. Kumara, Z. S. Stottler, Samo Korpar, F. Di Capua, P. Pakhlov, W. B. Yan, K. Nishimura, K. Lieret, and E. Solovieva

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Branching fraction, media_common.quotation_subject, Sigma, Lambda, 01 natural sciences, Asymmetry, Combinatorics, 0103 physical sciences, ddc:530, 010306 general physics, media_common
Abstract

Using a data sample of 980 fb−1 collected with the Belle detector at the KEKB asymmetric-energy e+e− collider, we study the processes of $$ {\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0} $$ Ξ c 0 → Λ K ¯ ∗ 0 , $$ {\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0} $$ Ξ c 0 → Σ 0 K ¯ ∗ 0 , and $$ {\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -} $$ Ξ c 0 → Σ + K ∗ − for the first time. The relative branching ratios to the normalization mode of $$ {\Xi}_c^0\to {\Xi}^{-}{\pi}^{+} $$ Ξ c 0 → Ξ − π + are measured to be$$ {\displaystyle \begin{array}{c}\mathcal{B}\left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.18\pm 0.02\left(\mathrm{stat}.\right)\pm 0.01\left(\mathrm{syst}.\right),\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.69\pm 0.03\left(\mathrm{stat}.\right)\pm 0.03\left(\mathrm{syst}.\right),\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.34\pm 0.06\left(\mathrm{stat}.\right)\pm 0.02\left(\mathrm{syst}.\right),\end{array}} $$ B Ξ c 0 → Λ K ¯ ∗ 0 / B Ξ c 0 → Ξ − π + = 0.18 ± 0.02 stat . ± 0.01 syst . , B Ξ c 0 → Σ 0 K ¯ ∗ 0 / B Ξ c 0 → Ξ − π + = 0.69 ± 0.03 stat . ± 0.03 syst . , B Ξ c 0 → Σ + K ∗ − / B Ξ c 0 → Ξ − π + = 0.34 ± 0.06 stat . ± 0.02 syst . , where the uncertainties are statistical and systematic, respectively. We obtain$$ {\displaystyle \begin{array}{c}\mathcal{B}\left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right)=\left(3.3\pm 0.3\left(\mathrm{stat}.\right)\pm 0.2\left(\mathrm{syst}.\right)\pm 1.0\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0}\right)=\left(12.4\pm 0.5\left(\mathrm{stat}.\right)\pm 0.5\left(\mathrm{syst}.\right)\pm 3.6\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast 0}\right)=\left(6.1\pm 1.0\left(\mathrm{stat}.\right)\pm 0.4\left(\mathrm{syst}.\right)\pm 1.8\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\end{array}} $$ B Ξ c 0 → Λ K ¯ ∗ 0 = 3.3 ± 0.3 stat . ± 0.2 syst . ± 1.0 ref . × 10 − 3 , B Ξ c 0 → Σ 0 K ¯ ∗ 0 = 12.4 ± 0.5 stat . ± 0.5 syst . ± 3.6 ref . × 10 − 3 , B Ξ c 0 → Σ + K ∗ 0 = 6.1 ± 1.0 stat . ± 0.4 syst . ± 1.8 ref . × 10 − 3 , where the uncertainties are statistical, systematic, and from $$ \mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right) $$ B Ξ c 0 → Ξ − π + , respectively. The asymmetry parameters $$ \alpha \left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right) $$ α Ξ c 0 → Λ K ¯ ∗ 0 and $$ \alpha \left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -}\right) $$ α Ξ c 0 → Σ + K ∗ − are 0.15 ± 0.22(stat.) ± 0.04(syst.) and −0.52 ± 0.30(stat.) ± 0.02(syst.), respectively, where the uncertainties are statistical followed by systematic.

Published
2021

65. Search for coherent charged pion production in neutrino-carbon interactions

Author

J. H. Choi, M. M. Khabibullin, Stephane T'Jampens, R. Gran, L. Whitehead, R. L. Helmer, T. Ishida, Katsuki Hiraide, S. Andringa, E. Fernandez, Takaaki Kajita, J. Y. Kim, J. Zalipska, A. Blondel, Shoei Nakayama, R. Terri, A. Ikeda, Y. Totsuka, Y. Takubo, Minoru Yoshida, S. Nawang, O. V. Mineev, C. Mariani, Y. Takeuchi, T. Nakadaira, Federico Sanchez, H. I. Jang, G. Jover, Shinya Yamada, G. Sitjes, T. Hara, Takehisa Hasegawa, K. Ishihara, K. K. Joo, K. McConnel, K. Nishikawa, Jordi Burguet-Castell, P. Novella, J. Hill, N. Tamura, Silvia Borghi, R. Schroeter, H. Yokoyama, F. Pierre, Michael B. Smy, M. Sekiguchi, J.J. Gómez-Cadenas, Y. Takenaga, Masaya Hasegawa, M. Miura, Yuichi Oyama, K. Kaneyuki, J. L. Stone, T. Inagaki, U. Dore, S. B. Kim, Makoto Sakuda, H. C. Bhang, Yu. Kudenko, J. Bouchez, M. Y. Pac, L. Ludovici, W. Wang, Koji Nakamura, Tomoyuki Maruyama, I. S. Jeong, C. Cavata, Itsuo Nakano, J. Argyriades, Toshio Namba, A. N. Khotjantsev, S. Matsuno, Masayuki Nakahata, Taichi Morita, Yasunari Suzuki, T. Kobayashi, T. Kutter, A. K. Ichikawa, H. Maesaka, Yoshitaka Itow, Masaaki Tanaka, A. Sarrat, K. Taki, Ko Okumura, F. Nova, E. J. Jeon, Hiroshi Sato, K. Asakura, P. Kitching, C. W. Walter, A. Konaka, Shigeki Aoki, S P Mikheyev, A. Cervera, C. Mauger, Kate Scholberg, J. Kameda, C. McGrew, Atsumu Suzuki, A. Okada, Y. Hayato, A. Minamino, H. G. Berns, Shoji Yamamoto, K. Hayashi, J. Mallet, Henry W. Sobel, K. Nitta, Tadayuki Takahashi, John G. Learned, Shaomin Chen, A. Tornero-Lopez, A. Rodriguez, D. Kerr, S. Likhoded, E. Sharkey, Y. Kuno, E. Kearns, C. O. Kim, Katsuhiro Kobayashi, Shigetaka Moriyama, Y. Fukuda, C. Saji, C. Yanagisawa, R. Ashie, K. O. Cho, T. Ishii, R. Nambu, X. Espinal, Y. Moriguchi, R. J. Wilkes, I. T. Lim, Masashi Yokoyama, Tsuyoshi Nakaya, J. Kubota, Masataka Iinuma, J. Yoo, Masato Shiozawa, T. Iwashita, C. K. Jung, D. Kielczewska, I. Kato, Y. Obayashi, S. Mine, M. Fechner, S. Ueda, E. Aliu, Mark R. Vagins, N. Yershov, W. R. Kropp, Yusuke Koshio, S. M. Oser, M. Ishitsuka, David William Casper, C. Mitsuda, J. Hosaka, K. K. Shiraishi, P. F. Loverre, T. Sasaki, L. R. Sulak, V. A. Matveev, Blondel, Alain, Borghi, Silvia, Cervera Villanueva, Anselmo, and Schroeter, Raphaël

Subjects
Particle physics, Meson, Physics::Instrumentation and Detectors, Neutrino-nucleus reactions, FOS: Physical sciences, General Physics and Astronomy, ddc:500.2, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pion, Experiment-HEP, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Neutrino oscillation, Nuclear Experiment, Charged current, Physics, Muon, Tamura, Norio, 010308 nuclear & particles physics, Neutrino oscillations, Física, 田村, 詔生, Production (computer science), High Energy Physics::Experiment, Neutrino, Lepton
Abstract

We report the result from a search for charged-current coherent pion production induced by muon neutrinos with a mean energy of 1.3 GeV. The data are collected with a fully active scintillator detector in the K2K long-baseline neutrino oscillation experiment. No evidence for coherent pion production is observed and an upper limit of $0.60 \times 10^{-2}$ is set on the cross section ratio of coherent pion production to the total charged-current interaction at 90% confidence level. This is the first experimental limit for coherent charged pion production in the energy region of a few GeV., 5 pages, 4 figures

Published
2021

66. Photoproduction of η mesons off the proton for 1.2<Eγ<4.7GeV using CLAS at Jefferson Laboratory

Author

I. Illari, R. A. Schumacher, U. Shrestha, M. Leali, S. Adhikari, B. McKinnon, C. A. Meyer, E. Munevar, P. Chatagnon, B. S. Ishkhanov, Aditya R. Khanal, G. V. Fedotov, P. Lenisa, J. Ritman, S. Stepanyan, N. Dashyan, D. P. Watts, Andrea Bianconi, M. Ungaro, K. P. Adhikari, A. El Alaoui, I. I. Strakovsky, G. Rosner, T. Chetry, A. Deur, C. W. Kim, Laura Clark, W. Phelps, M. Battaglieri, Nicholas Zachariou, J. C. Carvajal, Alexander Schmidt, M. J. Amaryan, William Brooks, Yordanka Ilieva, T. B. Hayward, V. Mascagna, B. A. Clary, E. L. Isupov, Y. G. Sharabian, H. Voskanyan, Friedrich Klein, W. J. Briscoe, P. Eugenio, S. Boiarinov, Brian Raue, G. Angelini, L. Barion, K. Joo, M. Guidal, Michael Paolone, Z. W. Zhao, F. X. Girod, F. Bossu, R. Cruz-Torres, E. Golovatch, M. Holtrop, R. Dupre, S. Strauch, Hovanes Egiyan, Maxime Defurne, K. A. Griffioen, Dustin Keller, C. Munoz Camacho, H. Hakobyan, Y. Prok, H. S. Jo, M. Hattawy, Michael Wood, K. Hafidi, D. G. Ireland, Luciano Pappalardo, V. Crede, A. Kim, D. I. Glazier, G. Ciullo, D. S. Carman, F. Sabatié, T. Hu, R. Paremuzyan, R. De Vita, D. Marchand, D. Protopopescu, Eugene Pasyuk, X. Wei, L. Venturelli, S. Diehl, Fatiha Benmokhtar, O. Soto, C. Salgado, E. Voutier, L. Lanza, Nicholas M. Harrison, Gerard Gilfoyle, A. Filippi, A. Movsisyan, J. W. Price, D. Sokhan, V. P. Kubarovsky, I. Bedlinskiy, M. Khandaker, M. Khachatryan, Nikolaos Sparveris, Z. E. Meziani, K. Wei, S. Niccolai, K. Livingston, N. Markov, Iu. Skorodumina, N. Tyler, C. Djalali, J. A. Tan, V. I. Mokeev, D. Heddle, Jie Zhang, G. Gavalian, D. G. Jenkins, R. Fersch, M. Ehrhart, M. Ripani, O. Pogorelko, P. L. Cole, J. Rowley, Tim O'Connell, A. I. Ostrovidov, Michael Dugger, T. Mineeva, P. Nadel-Turonski, H. Atac, A. S. Biselli, A. D'Angelo, L. Guo, Sylvester Joosten, Alessandro Rizzo, G. Asryan, L. El Fassi, C. Ayerbe Gayoso, M. E. McCracken, A. Hobart, C. Hanretty, W. Kim, G. Niculescu, P. Stoler, M. Osipenko, I. J. D. MacGregor, K. Hicks, M. Contalbrigo, J. Poudel, Z. Akbar, A. Celentano, and R. W. Gothe

Subjects
Physics, Particle physics, Range (particle radiation), Photon, Proton, Meson, 010308 nuclear & particles physics, Sigma, Photon energy, 01 natural sciences, 7. Clean energy, Resonance (particle physics), 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

Photoproduction cross sections are reported for the reaction $\gamma p\to p\eta$ using energy-tagged photons and the CLAS spectrometer at Jefferson Laboratory. The $\eta$ mesons are detected in their dominant charged decay mode, $\eta\to \pi^+\pi^-\pi^0$, and results on differential cross sections are presented for incident photon energies between 1.2 and 4.7 GeV. These new $\eta$ photoproduction data are consistent with earlier CLAS results but extend the energy range beyond the nucleon resonance region into the Regge regime. The normalized angular distributions are compared with the experimental results from several other experiments, and with predictions of $\eta$ MAID\,2018 and the latest solution of the Bonn-Gatchina coupled-channel analysis. Differential cross sections $d\sigma/dt$ are presented for incident photon energies $E_\gamma > 2.9$ GeV ($W > 2.5$ GeV), and compared with predictions which are based on Regge trajectories exchange in the $t$-channel (Regge models). The data confirm the expected dominance of $\rho$, $\omega$ vector-meson exchange in an analysis by the Joint Physics Analysis Center.

Published
2020

67. Search for a doubly charged DDK bound state in ϒ(1S, 2S) inclusive decays and via direct production in e+e− collisions at s=10.520 , 10.580, and 10.867 GeV

Author

R. Mussa, H. Miyata, Prafulla Kumar Behera, H. B. Jeon, A. Ishikawa, S. Al Said, H. Ye, M. Nakao, P. Križan, M. Uchida, Saraju P. Mohanty, Yongsun Kim, K. Lalwani, C. Schwanda, V. Bhardwaj, L. Santelj, S. Watanuki, Z. P. Zhang, M. Z. Wang, K. Kinoshita, C. Z. Yuan, E. Prencipe, G. S. Varner, R. Kulasiri, U. Tamponi, M. Shapkin, M. Röhrken, K. Chilikin, S. E. Vahsen, V.N. Zhilich, A. B. Kaliyar, W. Sutcliffe, M. Sumihama, D. Epifanov, S. Nishida, Martin Florian Bessner, J. Bennett, A. Rostomyan, P. Wang, B. G. Fulsom, Y. Iwasaki, J. G. Shiu, T. K. Pedlar, J. Schueler, G. Schnell, L. K. Li, K. Miyabayashi, R. Ayad, Seema Bahinipati, Jochen Dingfelder, W. B. Yan, Y. J. Kwon, V. Gaur, C. H. Wang, G. Pakhlova, R. Pestotnik, Dipak Kumar Sahoo, Seongbae Yang, C. W. Joo, Y. B. Li, K. Tanida, E. Won, L. Li Gioi, G. De Nardo, M. T. Hedges, N. Rout, S. Jia, T. Matsuda, S. Uno, Tagir Aushev, Y. Onuki, T. Kuhr, C. MacQueen, C. H. Li, M. Iwasaki, B. G. Cheon, M. Niiyama, Jyoti Prakash Biswal, A. Garmash, Andrey Sokolov, G. Bonvicini, A. Vinokurova, A. Natochii, T. Bilka, D. Y. Kim, K. Inami, Z. J. Liptak, R. Itoh, P. Krokovny, F. Tenchini, M. Campajola, K. Belous, S. Korpar, M. Watanabe, S. Sandilya, T. Podobnik, T. Sumiyoshi, Rakesh Kumar, K. H. Kang, K. Cho, S. C. Lee, F. Di Capua, Martin Ritter, Victoria Zhukova, B.A. Shwartz, I. Adachi, Semen Eidelman, A. Chen, T. Sanuki, S. Pardi, M. Starič, L. E. Piilonen, P. Oskin, H. Hayashii, E. Wang, L. Nayak, V. Babu, Vladimir Zhulanov, Y. Jin, T. Uglov, T. Ferber, R. Kroeger, Bruce Yabsley, M. E. Sevior, I. S. Lee, S. Cunliffe, P. Goldenzweig, J. Libby, D. M. Asner, K. Hayasaka, T. Mori, H. Aihara, M. C. Chang, G. Inguglia, Y. Guan, Tomoyuki Konno, K. Kumara, Y. Seino, M. T. Prim, Takeo Kawasaki, S.-J. Cho, Z. S. Stottler, D. Cinabro, P. Chang, M. Kumar, C. P. Shen, Seok Kim, M. Takizawa, Somnath Choudhury, D. Matvienko, Seokhee Park, John Yelton, Z. Doležal, K. Kim, H. Ono, S. K. Choi, M. Nayak, N. K. Nisar, J. S. Lange, R. Mizuk, T. Pang, S. Patra, Yoshinobu Unno, A. K. Giri, K. Sumisawa, M. Masuda, T. V. Dong, C.-L. Hsu, W. S. Hou, J. Li, C. Sharma, Peter Kodys, W. W. Jacobs, G. Karyan, V. Vorobyev, Y. Choi, V. Popov, Y. Sakai, O. Hartbrich, G. B. Mohanty, K. Lieret, K. K. Joo, N. Dash, E. Solovieva, X. P. Xu, S. Paul, D. Kotchetkov, B. Bhuyan, T. E. Browder, V. Savinov, R. Van Tonder, P. Pakhlov, G. Russo, H. Park, A. Bozek, Z. Natkaniec, D. Červenkov, J. H. Yin, S. Das, C. Kiesling, M. Bračko, A. Sangal, Rocky Bala Garg, M. Merola, K. Senyo, and C. Hadjivasiliou

Subjects
Physics, Direct production, Particle physics, KEKB, 010308 nuclear & particles physics, Branching fraction, 0103 physical sciences, Bound state, 010306 general physics, 01 natural sciences, Spectral line
Abstract

We report the results of a first search for a doubly charged DDK bound state, denoted the R++, in ϒ(1S) and ϒ(2S) inclusive decays and via direct production in e+e- collisions at s=10.520, 10.580, and 10.867 GeV. The search uses data accumulated with the Belle detector at the KEKB asymmetric-energy e+e- collider. No significant signals are observed in the D+Ds∗+ invariant-mass spectra of all studied modes. The 90% credibility level upper limits on their product branching fractions in ϒ(1S) and ϒ(2S) inclusive decays (B(ϒ(1S, 2S)→R+++anything)×B(R++→D+Ds∗+)), the product values of Born cross section and branching fraction in e+e- collisions (σ(e+e-→R+++anything)×B(R++→D+Ds∗+)) at s=10.520, 10.580, and 10.867 GeV under different assumptions of R++ masses varying from 4.13 to 4.17 GeV/c2 and widths varying from 0 to 5 MeV are obtained.

Published
2020

68. AB0037 APE1 REGULATES THE MIGRATION OF FIBROBLAST-LIKE SYNOVIOCYTES FROM PATIENTS WITH RHEUMATOID ARTHRITIS

Author

H. R. Lee, J. Kim, S. J. Yoo, J. A. Park, H. K. Joo, Y. R. Lee, S. Kim, B. H. Jeon, and S. W. Kang

Subjects
Rheumatology, Immunology, Immunology and Allergy, General Biochemistry, Genetics and Molecular Biology
Abstract

BackgroundThe level of apurinic/apyrimidinic endonuclease 1 (APE1) is elevated in synovial fluids from patients with rheumatoid arthritis (RA). However, the role of APE1 in RA pathogenesis remains unclear.ObjectivesTo explore whether APE1 affects cell migration through reactive oxygen species (ROS) level, fibroblast-like synoviocytes (FLS) from patients with RA were stimulated with human recombinant APE1.MethodsSynovial tissues were obtained from RA patients who were undergoing synovectomy or joint replacement. The isolated cells were cultured in Dulbecco’s modified Eagle’s medium (DMEM) supplemented with 10% fetal bovine serum and maintained in a 5% CO2 incubator at 37 °C. FLS were used for experiments after three to six passages. Cells were stimulated with or without recombinant interleukin 17 (IL-17; 10 ng/ml), tumor necrosis factor alpha (TNF-α; 10 ng/ml), and long-lasting recombinant human APE1 (MR201; 1, 10, 100 ng/ml) for 24 h. ROS levels were analyzed using MitoSOX dye. Cell migratory ability was examined using wound migration assay.ResultsRA FLS treated with APE1 showed slightly decreased level of mitochondrial specific ROS. To induce pro-inflammatory conditions, RA FLS were incubated with IL-17 and TNF-α. These cytokines are highly detected in RA synovium and directly stimulate FLS activation. Stimulation with IL-17 and TNF-α upregulated ROS by 30% compared to control. Cytokines-induced increase of ROS was inhibited by 22% in APE1 treatment. When FLS cultures were approximately 90% confluent, FLS monolayers were wounded with pipette tips and treated with IL-17/TNF-α and APE1 for 24 h. Cell migration was increased after treatment with IL-17/TNF-α. Cytokines-induced cell migration was remarkably attenuated by APE1 treatment.ConclusionRecombinant APE1 markedly inhibited mitochondrial specific ROS production and IL-17/TNF-α-induced cell migration in RA FLS.References[1]Bartok B, Firestein GS. Fibroblast-like synoviocytes: key effector cells in rheumatoid arthritis. Immunol Rev. 2010;233(1):233–55.[2]Mateen S, Moin S, Khan AQ, Zafar A, Fatima N. Increased reactive oxygen species formation and oxidative stress in rheumatoid arthritis. PLoS One. 2016;11(4):e0152925.[3]Lefevre S, Knedla A, Tennie C, Kampmann A, Wunrau C, Dinser R, Korb A, Schnaker EM, Tarner IH, Robbins PD, et al. Synovial fibroblasts spread rheumatoid arthritis to unaffected joints. Nat Med. 2009;15(12):1414–20.AcknowledgementsThis research was supported by Chungnam National University Hospital Research Fund, 2021.Disclosure of InterestsNone declared

Published
2022

69. Development of water-based liquid scintillator based on hydrophilic-lipophilic balance index

Author

J W Choi, J Y Choi, K K Joo, and H J Woo

Subjects
Condensed Matter Physics, Mathematical Physics, Atomic and Molecular Physics, and Optics
Abstract

Liquid scintillator (LS) dissolves a scintillating fluor in an organic base solvent to emit light. LS emits light when it receives energy from external sources. In this study, we developed a water-based liquid scintillator (WbLS), where a surfactant was used to mix water and oil. There are various surfactants in the market, hence, finding a suitable surfactant plays an important role in synthesizing liquid scintillators using water. We performed a feasibility study on synthesizing WbLS based on the hydrophilic-lipophilic balance (HLB) index. As far as we are concerned, no literature report on the investigation of WbLS using HLB index has been found. Long-term stability is very important for the WbLS, and it needs to be observed for at least a year for any changes. Meanwhile, as an application of WbLS, sinogram analysis was performed with Radon transformation. It was possible to reconstruct transverse images with longitudinal photo images of the WbLS sample. Optical tomography was done by combining WbLS and digital camera.

Published
2022

72. Search for transitions from ϒ(4S) and ϒ(5S) to ηb(1S) and ηb(2S) with emission of an ω meson

Author

K. Miyabayashi, W. B. Yan, Jyoti Prakash Biswal, A. Garmash, P. Goldenzweig, C.-L. Hsu, L. Nayak, Seongbae Yang, S. Pardi, T. Aushev, S. Sandilya, U. Tamponi, H. Nakazawa, Peter Kodys, Vladimir Popov, M. Campajola, W. W. Jacobs, T. Ferber, V. Gaur, R. Mussa, G. Schnell, M. Niiyama, S. Jia, T. Matsuda, Deepak Kumar Sahoo, M. Starič, D. M. Asner, A. B. Kaliyar, P. K. Behera, H. Ono, X. P. Xu, H. Aihara, A. Ishikawa, M. Nakao, T. Iijima, G. Karyan, C. W. Joo, D. Kotchetkov, G. Bonvicini, Motoki Iwasaki, F. Tenchini, C. Hadjivasiliou, J. Schueler, A. Vinokurova, S. Dubey, V. Aulchenko, P. Krokovny, Kohei Ogawa, Bruce Yabsley, S. E. Vahsen, T. J. Moon, A. Natochii, P. Oskin, S. K. Choi, Y. Onuki, P. Križan, R. Mizuk, T. Podobnik, Y. Sakai, K. Inami, S. Ogawa, Y. Iwasaki, F. Di Capua, K. H. Kang, K. Cho, D. Epifanov, Soumya D. Mohanty, E. Won, C. H. Wang, S. Paul, L. Li Gioi, M. Nayak, Y. J. Kwon, K. Kumara, E. Wang, E. Waheed, M. Hernandez Villanueva, V. Bhardwaj, T. K. Pedlar, H. Ye, C. Z. Yuan, E. Prencipe, K. Lieret, C. H. Li, T. Sanuki, S. Wehle, R. Dhamija, N. Rout, Z. S. Stottler, J. Libby, Ya-Qiu Jin, Victoria Zhukova, L. K. Li, D. Liventsev, A. K. Giri, M. Z. Wang, K. Kinoshita, D. Y. Kim, Y. Unno, T. Uglov, A. Chen, E. Solovieva, K. Trabelsi, A. Sangal, J. H. Yin, G. S. Varner, M. Shapkin, C. P. Shen, Z. P. Zhang, S. Cunliffe, Martin Florian Bessner, Y. Seino, M. Masuda, R. Kroeger, K. Chilikin, M. Takizawa, G. B. Mohanty, R. Ayad, M. E. Sevior, M. T. Prim, M. Merola, R. Itoh, H. Miyata, K. Sumisawa, G. De Nardo, M. T. Hedges, A. Rostomyan, K. Tanida, P. Wang, Shoichi Watanuki, K. Gudkova, L. Cao, H. Atmacan, Rahul Kumar, D. Cinabro, R. Pestotnik, John Yelton, Z. Doležal, Andrey Sokolov, B. Golob, T. V. Dong, H. Kichimi, Y. Choi, Z. J. Liptak, T. Hara, L. Santelj, L. E. Piilonen, J. Wiechczynski, N. K. Nisar, T. Bilka, Seokhee Park, H. Hayashii, G. Pakhlova, Yongsun Kim, S. Uno, C. Schwanda, R. Kulasiri, P. Chang, O. Hartbrich, C. H. Kim, H. E. Cho, M. Watanabe, J. C. Dingfelder, J. S. Lange, K. Senyo, T. Pang, J. V. Bennett, T. Mori, Y. Usov, Semen Eidelman, Y. Yusa, G.V. Russo, Somnath Choudhury, W. S. Hou, Felix Metzner, V. Vorobyev, K. K. Joo, B. G. Cheon, K. Belous, S. Korpar, S. C. Lee, J. G. Shiu, S. Nishida, V. Chekelian, R. Van Tonder, R. B. Garg, B. Bhuyan, B. G. Fulsom, T. E. Browder, V. Savinov, P. Pakhlov, Philip Lewis, H. Park, A. Bozek, C. Kiesling, M. Bračko, N. Gabyshev, D. Červenkov, V.N. Zhilich, and D. Ferlewicz

Subjects
Physics, Particle physics, KEKB, Meson, 010308 nuclear & particles physics, law, 0103 physical sciences, 010306 general physics, Collider, 01 natural sciences, Belle experiment, law.invention
Abstract

Using data collected in the Belle experiment at the KEKB asymmetric-energy e+e− collider we search for transitions Υ(4S)→ η$_{b}$(1S)ω, Υ(5S)→η$_{b}$(1S)ω and Υ(5S)→η$_{b}$(2S)ω. No significant signals are observed and we set 90% confidence level upper limits on the corresponding visible cross sections: 0.2 pb, 0.4 pb and 1.9 pb, respectively.

Published
2020

73. Extraction of beam-spin asymmetries from the hard exclusive π+ channel off protons in a wide range of kinematics

Author

Y. G. Sharabian, K. Tezgin, S. E. Kuhn, M. Hattawy, S. Adhikari, M. Khachatryan, M. J. Amaryan, N. Tyler, P. Lenisa, C. Dilks, J. A. Tan, C. W. Kim, H. Avakian, B. McKinnon, Maxime Defurne, Laura Clark, K. A. Griffioen, Chaden Djalali, D. Bulumulla, T. Mineeva, L. Guo, G. Angelini, D. I. Glazier, B. S. Ishkhanov, S. Strauch, Aditya R. Khanal, F. X. Girod, T. B. Hayward, M. Guidal, D. P. Watts, K. L. Giovanetti, P. L. Cole, E. L. Isupov, E. Golovatch, G. Asryan, L. Lanza, R. De Vita, Alessandro Rizzo, Z. W. Zhao, V. Crede, R. Dupre, H. Voskanyan, Andrea Bianconi, N. Markov, Brian Raue, Y. Ghandilyan, S. Boiarinov, A. D'Angelo, M. Mirazita, M. Ehrhart, W. Phelps, W. J. Briscoe, A. Filippi, M. Holtrop, Victor Mokeev, U. Shrestha, L. El Fassi, H. Atac, P. Nadel-Turonski, M. Khandaker, Luciano Pappalardo, P. Eugenio, J. W. Price, O. Pogorelko, I. J. D. MacGregor, T. Chetry, M. Osipenko, J. Rowley, M. Ripani, Fatiha Benmokhtar, H. Hakobyan, O. Soto, M. Battaglieri, S. Diehl, Paolo Rossi, K. Park, Michael Paolone, A. Celentano, R. W. Gothe, D. Heddle, F. Bossu, D. G. Ireland, Hovanes Egiyan, C. Munoz Camacho, W. Kim, Axel Schmidt, G. Niculescu, P. Stoler, Volker D. Burkert, M. Contalbrigo, A. S. Biselli, M. Ungaro, I. I. Strakovsky, K. Hicks, A. Deur, Nicholas M. Harrison, Gerard Gilfoyle, D. Marchand, V. Mascagna, Eugene Pasyuk, W. K. Brooks, D. G. Jenkins, S. Joosten, L. Marsicano, V. P. Kubarovsky, K. P. Adhikari, M. Leali, D. Riser, Z. E. Meziani, Y. Prok, F. Sabatié, I. Bedlinskiy, P. Kroll, K. Joo, Dustin Keller, Michael Wood, A. Kim, K. Livingston, Jie Zhang, H. S. Jo, C. Salgado, A. El Alaoui, Y. Ilieva, P. Chatagnon, Nicholas Zachariou, J. C. Carvajal, K. Semenov-Tian-Shansky, N. Dashyan, E. Voutier, L. Venturelli, L. Barion, R. A. Schumacher, G. Ciullo, D. S. Carman, Nikos Sparveris, X. Wei, T. A. Forest, S. Stepanyan, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and CLAS

Subjects
Particle physics, generalized parton distribution, Partons, Nucleons, Compton Scattering, media_common.quotation_subject, General Physics and Astronomy, parton: distribution function, Socio-culturale, Parton, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Resonance (particle physics), Asymmetry, High Energy Physics - Experiment, Pion, PE2_2, PE2_1, CLAS, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Nuclear Experiment, PE2_3, Spin-½, media_common, Physics, Settore FIS/04, electroproduction, moment, Moment (mathematics), distribution amplitude, High Energy Physics - Phenomenology, Amplitude, kinematics, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Elementary Particles and Fields, High Energy Physics::Experiment, Center of mass, asymmetry, experimental results
Abstract

We have measured beam-spin asymmetries to extract the \ud sin\ud ϕ\ud moment \ud A\ud sin\ud ϕ\ud L\ud U\ud from the hard exclusive \ud →\ud e\ud p\ud →\ud e\ud ′\ud n\ud π\ud +\ud reaction above the resonance region, for the first time with nearly full coverage from forward to backward angles in the center of mass. The \ud A\ud sin\ud ϕ\ud L\ud U\ud moment has been measured up to \ud 6.6\ud \ud \ud GeV\ud 2\ud in \ud −\ud t\ud , covering the kinematic regimes of generalized parton distributions (GPD) and baryon-to-meson transition distribution amplitudes (TDA) at the same time. The experimental results in very forward kinematics demonstrate the sensitivity to chiral-odd and chiral-even GPDs. In very backward kinematics where the TDA framework is applicable, we found \ud A\ud sin\ud ϕ\ud L\ud U\ud to be negative, while a sign change was observed near 90° in the center of mass. The unique results presented in this Letter will provide critical constraints to establish reaction mechanisms that can help to further develop the GPD and TDA frameworks.

Published
2020

74. Study of electromagnetic decays of orbitally excited Ξc baryons

Author

X. L. Wang, V. Chekelian, R. Van Tonder, M. Shapkin, J. K. Ahn, P. Pakhlov, K. Chilikin, G. Russo, H. Park, A. Bozek, P. Lewis, M. Uchida, J. Libby, D. M. Asner, C. MacQueen, C.-L. Hsu, B. Bhuyan, T. E. Browder, V. Savinov, K. Hayasaka, V. Bhardwaj, R. Ayad, Seema Bahinipati, Tagir Aushev, Y. Onuki, D. Epifanov, N. K. Nisar, G. S. Varner, J. S. Lange, S. Sandilya, J. B. Singh, E. Won, R. Pestotnik, Peter Kodys, T. J. Moon, W. W. Jacobs, S. K. Choi, T. K. Pedlar, X. P. Xu, D. Kotchetkov, Y. Seino, M. T. Prim, S. Al Said, M. Starič, A. Rostomyan, G. Schnell, T. Iijima, D. Y. Kim, C. W. Joo, S.-J. Cho, K. Kumara, M. Campajola, L. K. Li, P. Wang, B. G. Fulsom, Saraju P. Mohanty, Takeo Kawasaki, V.N. Zhilich, Y. Kato, S. Pardi, C. P. Shen, G. Karyan, G. De Nardo, Seok Kim, M. T. Hedges, A. B. Kaliyar, Seongbae Yang, M. Takizawa, F. Di Capua, W. Sutcliffe, A. Kuzmin, S. E. Vahsen, I. Adachi, Victoria Zhukova, Yongsun Kim, Z. S. Stottler, K. K. Joo, M. Merola, V. Babu, J. Schueler, R. Kulasiri, K. Lalwani, A. Chen, M. Sumihama, John Yelton, Z. Doležal, S. Jia, K. Lieret, Y. Choi, R. Mizuk, C. Schwanda, K. Miyabayashi, Y. Iwasaki, G. Inguglia, Y. J. Kwon, T. Ferber, V. Popov, T. Matsuda, S. Uno, L. Santelj, S. Ogawa, C. Beleño, K. Senyo, G. Bonvicini, M. Hernandez Villanueva, Shih-Chang Lee, E. Nakano, V. Gaur, Y. Sakai, S. Patra, A. Vinokurova, O. Hartbrich, H. Hayashii, E. Waheed, D. Matvienko, N. Rout, Bruce Yabsley, E. Solovieva, H. Ono, W. S. Hou, S. Nishida, G. B. Mohanty, B. H. Kim, P. Krokovny, Rakesh Kumar, Seokhee Park, M. Nayak, A. K. Giri, K. Sumisawa, K. H. Kang, K. Cho, H. Miyata, Prafulla Kumar Behera, W. B. Yan, V. Vorobyev, S.I. Eidelman, M. Z. Wang, K. Kinoshita, M. Masuda, E. Prencipe, T. V. Dong, Y. Unno, J. Bennett, Dipak Kumar Sahoo, Kohei Ogawa, A. Natochii, K. Inami, V.E. Shebalin, M. Iwasaki, B. G. Cheon, R. Itoh, S. Korpar, J. G. Shiu, Phillip Urquijo, Y. B. Li, Jyoti Prakash Biswal, J. F. Strube, E. Wang, Z. P. Zhang, G. Pakhlova, J. T. McNeil, T. Mori, H. Aihara, Y. Usov, M. Mrvar, A. Garmash, T. Sanuki, D. Liventsev, S. Cunliffe, M. C. Chang, F. Tenchini, T. Podobnik, T. Sumiyoshi, Martin Ritter, L. E. Piilonen, P. Oskin, L. Li Gioi, R. Mussa, A. Ishikawa, M. Nakao, P. Križan, Andrey Sokolov, Rocky Bala Garg, C. Hadjivasiliou, Z. Natkaniec, N. Gabyshev, D. Červenkov, J. H. Yin, C. Kiesling, M. Bračko, T. Bilka, M. Watanabe, U. Tamponi, C. H. Wang, S. Paul, H. Ye, Tao Luo, K. Tanida, D. Cinabro, H. Kichimi, P. Chang, Z. J. Liptak, B.A. Shwartz, Vladimir Zhulanov, Y. Jin, T. Uglov, R. Kroeger, M. E. Sevior, P. Goldenzweig, and Somnath Choudhury

Subjects
Physics, Quark, Particle physics, 010308 nuclear & particles physics, 01 natural sciences, Measure (mathematics), law.invention, Charmed baryons, Baryon, KEKB, law, Excited state, 0103 physical sciences, 010306 general physics, Collider
Abstract

Using 980 fb−1 of data collected with the Belle detector operating at the KEKB asymmetric-energy eþe− collider, we report a study of the electromagnetic decays of excited charmed baryons Ξcð2790Þ and Ξcð2815Þ. A clear signal (8.6 standard deviations) is observed for Ξcð2815Þ0 → Ξ0 cγ, and we measure: B½Ξcð2815Þ0 → Ξ0 cγ B½Ξcð2815Þ0 → Ξcð2645Þþπ− → Ξ0 cπþπ− ¼ 0.41 0.05 0.03. We also present evidence (3.8 standard deviations) for the similar decay of the Ξcð2790Þ0 and measure: B½Ξcð2790Þ0 → Ξ0 cγ B½Ξcð2790Þ0 → Ξ0þ c π− → Ξþ c γπ− ¼ 0.13 0.03 0.02. The first quoted uncertainties are statistical and the second systematic. We find no hint of the analogous decays of the Ξcð2815Þþ and Ξcð2790Þþ baryons and set upper limits at the 90% confidence level of: B½Ξcð2815Þþ → Ξþ c γ B½Ξcð2815Þþ → Ξcð2645Þ0πþ → Ξþ c π−πþ < 0.09, and B½Ξcð2790Þþ → Ξþ c γ B½Ξcð2790Þþ → Ξ00 c πþ → Ξ0 cγπþ < 0.06. Approximate values of the partial widths of the decays are extracted, which can be used to discriminate between models of the underlying quark structure of these excited states.

Published
2020

75. First measurement of direct photoproduction of the a2(1320)0 meson on the proton

Author

J. Rowley, A. I. Ostrovidov, Volker D. Burkert, A. S. Biselli, W. Phelps, K. A. Griffioen, V. Mascagna, N. Markov, M. E. McCracken, A. Hobart, Carlos A. Salgado, A. Filippi, A. Pilloni, Frank Klein, Dustin Keller, P. Eugenio, L. Marsicano, Sylvester Joosten, Maxime Defurne, M. Khandaker, M. Khachatryan, M. Osipenko, Pawel Nadel-Turonski, Michael Paolone, Alexander Schmidt, D. I. Glazier, D. Bulumulla, E. Munevar, B. S. Ishkhanov, Aditya R. Khanal, Nikolaos Sparveris, M. Ungaro, K. Hafidi, F. Bossu, M. Guidal, G. Niculescu, L. Lanza, D. G. Jenkins, I. J. D. MacGregor, R. De Vita, M. Leali, Laura Clark, M. J. Amaryan, Andrea Bianconi, C. W. Kim, W. Kim, W. Gohn, F. X. Girod, N. Tyler, C. Djalali, J. A. Tan, P. Chatagnon, G. V. Fedotov, H. Voskanyan, A. D'Angelo, T. Chetry, I. Bedlinskiy, L. Elouadrhiri, M. Holtrop, F. Hauenstein, W. J. Briscoe, E. Pasyuk, S. Strauch, K. Joo, H. Atac, D. P. Watts, H. Egiyan, G. Angelini, L. El Fassi, I. I. Strakovsky, R. Dupre, M. Battaglieri, F. Sabatié, Luciano Pappalardo, D. Heddle, A. Deur, M. Ripani, G. Gavalian, V. Mokeev, D. Marchand, V. Lucherini, V. P. Kubarovsky, Michael Dugger, Fatiha Benmokhtar, Krishna Neupane, R. G. Fersch, O. Pogorelko, O. Soto, S. Niccolai, Vincent Mathieu, P. L. Cole, Z. W. Zhao, Alessandro Rizzo, E. Golovatch, P. Lenisa, K. Hicks, M. Ehrhart, S. Adhikari, T. B. Hayward, J. Zhang, M. Hattawy, J. W. Price, N. Dashyan, Yordanka Ilieva, L. Barion, G. Rosner, William Brooks, G. Ciullo, Y. Prok, L. Venturelli, D. S. Carman, R. A. Schumacher, A. El Alaoui, X. Wei, Nicholas Zachariou, J. C. Carvajal, S. Stepanyan, E. Voutier, A. Movsisyan, Adam P. Szczepaniak, D. Sokan, Z. E. Meziani, K. Livingston, K. P. Adhikari, H. Hakobyan, H. S. Jo, A. Kim, J. Ritman, S. Diehl, D. G. Ireland, V. Crede, O. Cortes, E. L. Isupov, R. Paremuzyan, S. Boiarinov, R. Cruz-Torres, Nicholas M. Harrison, U. Shrestha, M. Contalbrigo, C. Munoz Camacho, M. H. Wood, B. McKinnon, A. Celentano, R. W. Gothe, M. Mirazita, and N. Gevorgyan

Subjects
Physics, Meson, 010308 nuclear & particles physics, Partial wave analysis, Hadron, Sigma, Photon energy, 01 natural sciences, Nuclear physics, Amplitude, 0103 physical sciences, Invariant mass, Nuclear Experiment, 010306 general physics, Phenomenology (particle physics)
Abstract

We present the first measurement of the exclusive reaction $\gamma p \rightarrow a_2(1320)^0 \, p$ in the photon energy range $3.5$-$5.5$ GeV and four-momentum transfer squared $0.2

Published
2020

76. The JSNS2 data acquisition system

Author

Shoichi Hasegawa, Yorihito Sugaya, Eunhyang Kwon, J. R. Jordan, R. Ujiie, M. Niiyama, K. Nishikawa, T. Maruyama, J. S. Park, T. Hiraiwa, M. Taira, H. Jeon, K. K. Joo, S. Jeon, Takeo Kawasaki, J. Spitz, Myung-Ki Cheoun, M. Jang, I. T. Lim, M. Botran, Masaharu Nomachi, J. S. Jang, Tatsushi Shima, H. I. Jang, Carsten Rott, Y. Hino, D. H. Lee, S. Monjushiro, Tomoyuki Konno, E. Marzec, M. Y. Pac, Jeong-Sik Choi, S. Ajimura, P. Gwak, F. Suekane, Intae Yu, I. Stancu, S. J. M. Peeters, T. Nakano, H. Furuta, Masahide Harada, Eunja Kim, Seyong Kim, J. Y. Kim, J. H. Seo, C. D. Shin, Kentaro Suzuya, Shinichi Sakamoto, A. Zohaib, S. B. Kim, Kenji Sakai, Sin Kyu Kang, W. Kim, S. Meigo, H. Ray, Hyonsan Seo, Dong Ho Moon, D. E. Jung, Minfang Yeh, Y. Kasugai, and T. Dodo

Subjects
Physics, Photomultiplier, 010308 nuclear & particles physics, business.industry, Detector, Scintillator, 01 natural sciences, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, Data acquisition, Optics, 0103 physical sciences, Neutron source, Neutrino, Neutrino oscillation, business, Instrumentation, Mathematical Physics, Spallation Neutron Source
Abstract

The JSNS$^{2}$ (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) experiment aims to search for neutrino oscillations over a 24 m short baseline at J-PARC. The JSNS$^{2}$ inner detector is filled with 17 tons of gadolinium(Gd)-loaded liquid scintillator (LS) with an additional 31 tons of unloaded LS in the intermediate $\gamma$-catcher and an optically separated outer veto volumes. A total of 120 10-inch photomultiplier tubes observe the scintillating optical photons and each analog waveform is stored with the flash analog-to-digital converters. We present details of the data acquisition, processing, and data quality monitoring system. We also present two different trigger logics which are developed for the beam and self-trigger.

Published
2020

77. The Hyper-Kamiokande Experiment -- Snowmass LOI

Author

Hyper-Kamiokande Collaboration, K. Abe, P. Adrich, H. Aihara, R. Akutsu, I. Alekseev, A. Ali, F. Ameli, L. H. V. Anthony, A. Araya, Y. Asaoka, V. Aushev, I. Bandac, M. Barbi, G. Barr, M. Batkiewicz-Kwasniak, M. Bellato, V. Berardi, L. Bernard, E. Bernardini, L. Berns, S. Bhadra, J. Bian, A. Blanchet, A. Blondel, A. Boiano, S. Bolognesi, L. Bonavera, S. Borjabad, T. Boschi, D. Bose, S . B. Boyd, C. Bozza, A. Bravar, C. Bronner, A. Bubak, A. Buchowicz, M. Buizza Avanzini, F. S. Cafagna, N. F. Calabria, J. M. Calvo-Mozota, S. Cao, M. G. Catanesi, S. Chakraborty, J. H. Choi, S. Choubey, M. Cicerchia, J. Coleman, G. Collazuol, S. Cuen-Rochin, M. Danilov, E. De la Fuente, P. de Perio, G. De Rosa, T. Dealtry, C. J. Densham, A. Dergacheva, N. Deshmukh, M. M. Devi, F. Di Lodovico, P. Di Meo, I. Di Palma, T. A. Doyle, E. Drakopoulou, O. Drapier, J. Dumarchez, L. Eklund, S. El Hedri, J. Ellis, S. Emery, A. Esmaili, S. Fedotov, J. Feng, E. Fernández-Martinez, P. Ferrario, B. Ferrazzi, A. Finch, C. Finley, G. Fiorillo, M. Fitton, M. Friend, Y. Fujii, Y. Fukuda, G. Galinski, J. Gao, C. Garde, A. Garfagnini, S. Garode, L. Gialanella, C. Giganti, J. J. Gomez-Cadenas, M. Gonin, J. González-Nuevo, A. Gorin, R. Gornea, F. Gramegna, M. Grassi, G. Grella, M. Guigue, D. R. Hadley, M. Harada, M. Hartz, S. Hassani, N. C. Hastings, Y. Hayato, K. Hiraide, K. Hoshina, K. Hultqvist, F. Iacob, A. K. Ichikawa, W. Idrissi Ibnsalih, M. Ikeda, M. Inomoto, A. Ioannisian, T. Ishida, K. Ishidoshiro, H. Ishino, M. Ishitsuka, H. Ito, S. Ito, Y. Itow, K. Iwamoto, N. Izumi, S. Izumiyama, M. Jakkapu, B. Jamieson, J. S. Jang, H. S. Jo, P. Jonsson, K. K. Joo, T. Kajita, H. Kakuno, J. Kameda, Y. Kano, D. Karlen, Y. Kataoka, A. Kato, T. Katori, N. Kazarian, M. Khabibullin, A. Khotjantsev, T. Kikawa, J. Y. Kim, S. B. Kim, S. King, T. Kinoshita, J. Kisiel, A. Klekotko, T. Kobayashi, L. Koerich, N. Kolev, A. Konaka, L. L. Kormos, Y. Koshio, Y. Kotsar, K. A. Kouzakov, K. L. Kowalik, L. Kravchuk, A. P. Kryukov, Y. Kudenko, T. Kumita, R. Kurjata, T. Kutter, M. Kuze, K. Kwak, M. La Commara, L. Labarga, J. Lagoda, M. Lamoureux, M. Laveder, L. Lavitola, J. Lee, R. Leitner, V. Lezaun, I. T. Lim, T. Lindner, R. P. Litchfield, K. R. Long, A. Longhin, P. Loverre, X. Lu, L. Ludovici, Y. Maekawa, L. Magaletti, K. Magar, Y. Makida, M. Malek, M. Malinský, T. Marchi, C. Mariani, A. Marinelli, K. Martens, Ll. Marti, J. F. Martin, D. Martin, J. Marzec, T. Matsubara, R. Matsumoto, N. McCauley, A. Medhi, P. Mehta, L. Mellet, H. Menjo, M. Mezzetto, J. Migenda, P. Migliozzi, S. Miki, A. Minamino, S. Mine, O. Mineev, A. Mitra, M. Miura, R. Moharana, C. M. Mollo, T. Mondal, M. Mongelli, F. Monrabal, D. H. Moon, C. S. Moon, S. Moriyama, T. Mueller, Y. Nagao, T. Nakadaira, K. Nakagiri, M. Nakahata, S. Nakai, Y. Nakajima, K. Nakamura, KI. Nakamura, H. Nakamura, Y. Nakano, T. Nakaya, S. Nakayama, K. Nakayoshi, L. Nascimento Machado, C. E. R. Naseby, B. Navarro-Garcia, M. Needham, K. Niewczas, Y. Nishimura, F. Nova, J. C. Nugent, H. Nunokawa, W. Obrebski, J. P. Ochoa-Ricoux, E. O'Connor, N. Ogawa, T. Ogitsu, K. Okamoto, H. M. O'Keeffe, K. Okumura, Y. Onishchuk, F. Orozco-Luna, A. Oshlianskyi, N. Ospina, M. Ostrowski, E. O'Sullivan, Y. Oyama, H. Ozaki, M. Y. Pac, P. Paganini, V. Palladino, M. Pari, J. Pasternak, C. Pastore, G. Pastuszak, D. A. Patel, M. Pavin, D. Payne, C. Peña-Garay, C. Pidcott, S. Playfer, B. W. Pointon, A. Popov, B. Popov, K. Porwit, M. Posiadala-Zezula, G. Pronost, N. W. Prouse, B. Quilain, A. A. Quiroga, E. Radicioni, B. Radics, P. J. Rajda, M. Rescigno, G. Ricciardi, B. Richards, E. Rondio, B. Roskovec, S. Roth, C. Rott, A. Rubbia, A. C. Ruggeri, S. Russo, A. Rychter, D. Ryu, K. Sakashita, S. Samani, F. Sánchez, M. L. Sánchez, S. Sano, J. D. Santos, G. Santucci, P. Sarmah, K. Sato, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, J. W. Seo, D. Sgalaberna, A. Shaykina, I. Shimizu, C. D. Shin, M. Shinoki, M. Shiozawa, N. Skrobova, K. Skwarczynski, M. B. Smy, J. Sobczyk, H. W. Sobel, F. J. P. Soler, Y. Sonoda, R. Spina, B. Spisso, P. Spradlin, K. L. Stankevich, L. Stawarz, S. M. Stellacci, A. I. Studenikin, S. L. Suárez Gómez, T. Suganuma, S. Suvorov, Y. Suwa, A. T. Suzuki, S. Suzuki, Y. Suzuki, D. Svirida, M. Taani, M. Tada, A. Takeda, Y. Takemoto, A. Takenaka, A. Taketa, Y. Takeuchi, H. Tanaka, H. I. Tanaka, M. Tanaka, T. Tashiro, M. Thiesse, L. F. Thompson, A. K. Tomatani-Sánchez, G. Tortone, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, M. R. Vagins, S. Valder, V. Valentino, G. Vasseur, A. Vijayvargi, W. G. S. Vinning, D. Vivolo, R. B. Vogelaar, M. M. Vyalkov, T. Wachala, J. Walker, D. Wark, M. O. Wascko, R. A. Wendell, J. R. Wilson, S. Wronka, J. Xia, Y. Yamaguchi, K. Yamamoto, T. Yano, N. Yershov, M. Yokoyama, J. Yoo, I. Yu, T. Zakrzewski, B. Zaldivar, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, K. Zietara, M. Zito, S. Zsoldos, Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Hyper-Kamiokande, HEP, INSPIRE, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Collaboration, Hyper-Kamiokande, Abe, K., Adrich, P., Aihara, H., Akutsu, R., Alekseev, I., Ali, A., Ameli, F., Anthony, L. H. V., Araya, A., Asaoka, Y., Aushev, V., Bandac, I., Barbi, M., Barr, G., Batkiewicz-Kwasniak, M., Bellato, M., Berardi, V., Bernard, L., Bernardini, E., Berns, L., Bhadra, S., Bian, J., Blanchet, A., Blondel, A., Boiano, A., Bolognesi, S., Bonavera, L., Borjabad, S., Boschi, T., Bose, D., Boyd, S . B., Bozza, C., Bravar, A., Bronner, C., Bubak, A., Buchowicz, A., Buizza Avanzini, M., Cafagna, F. S., Calabria, N. F., Calvo-Mozota, J. M., Cao, S., Catanesi, M. G., Chakraborty, S., Choi, J. H., Choubey, S., Cicerchia, M., Coleman, J., Collazuol, G., Cuen-Rochin, S., Danilov, M., De la Fuente, E., de Perio, P., De Rosa, G., Dealtry, T., Densham, C. J., Dergacheva, A., Deshmukh, N., Devi, M. M., Di Lodovico, F., Di Meo, P., Di Palma, I., Doyle, T. A., Drakopoulou, E., Drapier, O., Dumarchez, J., Eklund, L., El Hedri, S., Ellis, J., Emery, S., Esmaili, A., Fedotov, S., Feng, J., Fernández-Martinez, E., Ferrario, P., Ferrazzi, B., Finch, A., Finley, C., Fiorillo, G., Fitton, M., Friend, M., Fujii, Y., Fukuda, Y., Galinski, G., Gao, J., Garde, C., Garfagnini, A., Garode, S., Gialanella, L., Giganti, C., Gomez-Cadenas, J. J., Gonin, M., González-Nuevo, J., Gorin, A., Gornea, R., Gramegna, F., Grassi, M., Grella, G., Guigue, M., Hadley, D. R., Harada, M., Hartz, M., Hassani, S., Hastings, N. C., Hayato, Y., Hiraide, K., Hoshina, K., Hultqvist, K., Iacob, F., Ichikawa, A. K., Idrissi Ibnsalih, W., Ikeda, M., Inomoto, M., Ioannisian, A., Ishida, T., Ishidoshiro, K., Ishino, H., Ishitsuka, M., Ito, H., Ito, S., Itow, Y., Iwamoto, K., Izumi, N., Izumiyama, S., Jakkapu, M., Jamieson, B., Jang, J. S., Jo, H. S., Jonsson, P., Joo, K. K., Kajita, T., Kakuno, H., Kameda, J., Kano, Y., Karlen, D., Kataoka, Y., Kato, A., Katori, T., Kazarian, N., Khabibullin, M., Khotjantsev, A., Kikawa, T., Kim, J. Y., Kim, S. B., King, S., Kinoshita, T., Kisiel, J., Klekotko, A., Kobayashi, T., Koerich, L., Kolev, N., Konaka, A., Kormos, L. L., Koshio, Y., Kotsar, Y., Kouzakov, K. A., Kowalik, K. L., Kravchuk, L., Kryukov, A. P., Kudenko, Y., Kumita, T., Kurjata, R., Kutter, T., Kuze, M., Kwak, K., La Commara, M., Labarga, L., Lagoda, J., Lamoureux, M., Laveder, M., Lavitola, L., Lee, J., Leitner, R., Lezaun, V., Lim, I. T., Lindner, T., Litchfield, R. P., Long, K. R., Longhin, A., Loverre, P., Lu, X., Ludovici, L., Maekawa, Y., Magaletti, L., Magar, K., Makida, Y., Malek, M., Malinský, M., Marchi, T., Mariani, C., Marinelli, A., Martens, K., Marti, Ll., Martin, J. F., Martin, D., Marzec, J., Matsubara, T., Matsumoto, R., Mccauley, N., Medhi, A., Mehta, P., Mellet, L., Menjo, H., Mezzetto, M., Migenda, J., Migliozzi, P., Miki, S., Minamino, A., Mine, S., Mineev, O., Mitra, A., Miura, M., Moharana, R., Mollo, C. M., Mondal, T., Mongelli, M., Monrabal, F., Moon, D. H., Moon, C. S., Moriyama, S., Mueller, T., Nagao, Y., Nakadaira, T., Nakagiri, K., Nakahata, M., Nakai, S., Nakajima, Y., Nakamura, K., Nakamura, Ki., Nakamura, H., Nakano, Y., Nakaya, T., Nakayama, S., Nakayoshi, K., Nascimento Machado, L., Naseby, C. E. R., Navarro-Garcia, B., Needham, M., Niewczas, K., Nishimura, Y., Nova, F., Nugent, J. C., Nunokawa, H., Obrebski, W., Ochoa-Ricoux, J. P., O'Connor, E., Ogawa, N., Ogitsu, T., Okamoto, K., O'Keeffe, H. M., Okumura, K., Onishchuk, Y., Orozco-Luna, F., Oshlianskyi, A., Ospina, N., Ostrowski, M., O'Sullivan, E., Oyama, Y., Ozaki, H., Pac, M. Y., Paganini, P., Palladino, V., Pari, M., Pasternak, J., Pastore, C., Pastuszak, G., Patel, D. A., Pavin, M., Payne, D., Peña-Garay, C., Pidcott, C., Playfer, S., Pointon, B. W., Popov, A., Popov, B., Porwit, K., Posiadala-Zezula, M., Pronost, G., Prouse, N. W., Quilain, B., Quiroga, A. A., Radicioni, E., Radics, B., Rajda, P. J., Rescigno, M., Ricciardi, G., Richards, B., Rondio, E., Roskovec, B., Roth, S., Rott, C., Rubbia, A., Ruggeri, A. C., Russo, S., Rychter, A., Ryu, D., Sakashita, K., Samani, S., Sánchez, F., Sánchez, M. L., Sano, S., Santos, J. D., Santucci, G., Sarmah, P., Sato, K., Scott, M., Seiya, Y., Sekiguchi, T., Sekiya, H., Seo, J. W., Sgalaberna, D., Shaykina, A., Shimizu, I., Shin, C. D., Shinoki, M., Shiozawa, M., Skrobova, N., Skwarczynski, K., Smy, M. B., Sobczyk, J., Sobel, H. W., Soler, F. J. P., Sonoda, Y., Spina, R., Spisso, B., Spradlin, P., Stankevich, K. L., Stawarz, L., Stellacci, S. M., Studenikin, A. I., Suárez Gómez, S. L., Suganuma, T., Suvorov, S., Suwa, Y., Suzuki, A. T., Suzuki, S., Suzuki, Y., Svirida, D., Taani, M., Tada, M., Takeda, A., Takemoto, Y., Takenaka, A., Taketa, A., Takeuchi, Y., Tanaka, H., Tanaka, H. I., Tanaka, M., Tashiro, T., Thiesse, M., Thompson, L. F., Tomatani-Sánchez, A. K., Tortone, G., Tsui, K. M., Tsukamoto, T., Tzanov, M., Uchida, Y., Vagins, M. R., Valder, S., Valentino, V., Vasseur, G., Vijayvargi, A., Vinning, W. G. S., Vivolo, D., Vogelaar, R. B., Vyalkov, M. M., Wachala, T., Walker, J., Wark, D., Wascko, M. O., Wendell, R. A., Wilson, J. R., Wronka, S., Xia, J., Yamaguchi, Y., Yamamoto, K., Yano, T., Yershov, N., Yokoyama, M., Yoo, J., Yu, I., Zakrzewski, T., Zaldivar, B., Zalipska, J., Zaremba, K., Zarnecki, G., Ziembicki, M., Zietara, K., Zito, M., and Zsoldos, S.

Subjects
nucleon: decay, Physics - Instrumentation and Detectors, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Cherenkov counter: water, Physics::Instrumentation and Detectors, J-PARC Lab, High Energy Physics::Phenomenology, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), KAMIOKANDE, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], upgrade, High Energy Physics::Experiment, Physics - Instrumentation and Detector, neutrino: oscillation, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], activity report
Abstract

Hyper-Kamiokande is the next generation underground water Cherenkov detector that builds on the highly successful Super-Kamiokande experiment. The detector which has an 8.4~times larger effective volume than its predecessor will be located along the T2K neutrino beamline and utilize an upgraded J-PARC beam with 2.6~times beam power. Hyper-K's low energy threshold combined with the very large fiducial volume make the detector unique, that is expected to acquire an unprecedented exposure of 3.8~Mton$\cdot$year over a period of 20~years of operation. Hyper-Kamiokande combines an extremely diverse science program including nucleon decays, long-baseline neutrino oscillations, atmospheric neutrinos, and neutrinos from astrophysical origins. The scientific scope of this program is highly complementary to liquid-argon detectors for example in sensitivity to nucleon decay channels or supernova detection modes. Hyper-Kamiokande construction has started in early 2020 and the experiment is expected to start operations in 2027. The Hyper-Kamiokande collaboration is presently being formed amongst groups from 19 countries including the United States, whose community has a long history of making significant contributions to the neutrino physics program in Japan. US physicists have played leading roles in the Kamiokande, Super-Kamiokande, EGADS, K2K, and T2K programs., 6 pages, prepared as Snowmass2021 LOI

Published
2020

80. Dalitz analysis of D0→K−π+η decays at Belle

Author

J. E. Fast, A. Garmash, Y. Iwasaki, Y. J. Kwon, T. Bilka, M. Watanabe, X. P. Xu, S. Eidelman, O. Schneider, N. Rout, A. Rabusov, Shih-Chang Lee, P. K. Behera, W. Sutcliffe, S. Jia, H. Aihara, K. Senyo, P. Pakhlov, T. Uglov, V. M. Aulchenko, C. H. Wang, T. Kawasaki, S. Paul, Seongbae Yang, M. Sumihama, Mikihiko Nakao, P. Goldenzweig, Motoki Iwasaki, L. Li Gioi, Y. Q. Chen, H. Park, A. Bozek, M. Shapkin, Vladimir Popov, Sudhanwa Patra, Andrey Sokolov, G. Schnell, J. Libby, J. H. Yin, H. Ye, E.-J. Jang, S. Ogawa, P. Krokovny, B. G. Cheon, M. Uchida, D. Liventsev, V. Babu, V.N. Zhilich, D. Ferlewicz, T. Aushev, K. H. Kang, K. Cho, Y. Sakai, M. Röhrken, K. Chilikin, H. Ono, G. S. Varner, M. Starič, V. V. Zhulanov, E. Waheed, T. Kuhr, K. Lieret, Z. Natkaniec, L. K. Li, D. Epifanov, M. Z. Wang, K. Kinoshita, Soumya D. Mohanty, R. Itoh, T. Ferber, P. Wang, Seema Bahinipati, B. Golob, T. V. Dong, S. Korpar, Y. Choi, K. Miyabayashi, Y. Seino, I. Badhrees, E. Solovieva, G. De Nardo, F. Di Capua, D. Y. Kim, N. Dash, M. Mrvar, V. Bhardwaj, T. K. Pedlar, J. S. Lange, J. G. Shiu, M. T. Prim, C. MacQueen, T. D. Kimmel, Phillip Urquijo, D. M. Asner, R. Mussa, H. B. Jeon, A. Ishikawa, A. J. Schwartz, P. Križan, Y. B. Li, G.V. Russo, D. Cinabro, R. Pestotnik, R. Kroeger, K. Trabelsi, M. E. Sevior, I. S. Lee, Seok Kim, G. Inguglia, M. Campajola, W. S. Hou, O. Hartbrich, C. Z. Yuan, E. Prencipe, Alexei Kuzmin, V. Vorobyev, Somnath Choudhury, Victoria Zhukova, M. Merola, K. Inami, S. Pardi, A. Chen, J. Schueler, E. Won, Y. Yusa, H. Hayashii, H. Atmacan, F. Tenchini, R. Ayad, Z. S. Stottler, T. Podobnik, T. Sumiyoshi, Martin Ritter, K. Tanida, I. Adachi, T. Sanuki, L. E. Piilonen, G. Pakhlova, P. Oskin, R. Kulasiri, D. Matvienko, K. K. Joo, S. Cunliffe, Y. Guan, M. C. Chang, K. Hayasaka, H. E. Cho, R. B. Garg, B. G. Fulsom, T. E. Browder, V. Savinov, S. Nishida, V. Chekelian, J. V. Bennett, Z. P. Zhang, Jyoti Prakash Biswal, R. Mizuk, V. Gaur, Deepak Kumar Sahoo, J. MacNaughton, E. Wang, S. Al Said, A. K. Giri, K. Lalwani, S. Uno, C. Schwanda, M. Masuda, M. Nayak, L. Cao, Ya-Qiu Jin, C.-L. Hsu, Peter Kodys, W. W. Jacobs, Rahul Kumar, V.E. Shebalin, G. Karyan, W. Yan, S. K. Choi, M. Takizawa, Z. Doležal, N. Gabyshev, D. Červenkov, and M. Bračko

Subjects
Physics, Particle physics, KEKB, 010308 nuclear & particles physics, Branching fraction, 0103 physical sciences, Dalitz plot, 010306 general physics, 01 natural sciences
Abstract

We present the results of the first Dalitz plot analysis of the decay D0→K-π+η. The analysis is performed on a data set corresponding to an integrated luminosity of 953 fb-1 collected by the Belle detector at the asymmetric-energy e+e- KEKB collider. The Dalitz plot is well described by a combination of the six resonant decay channels K∗(892)0η, K-a0(980)+, K-a2(1320)+, K∗(1410)0η, K∗(1680)-π+ and K2∗(1980)-π+, together with Kπ and Kη S-wave components. The decays K∗(1680)-→K-η and K2∗(1980)-→K-η are observed for the first time. We measure ratio of the branching fractions, B(D0→K-π+η)B(D0→K-π+)=0.500±0.002(stat)±0.020(syst)±0.003(BPDG). Using the Dalitz fit result, the ratio B(K∗(1680)→Kη)B(K∗(1680)→Kπ) is measured to be 0.11±0.02(stat)-0.04+0.06(syst)±0.04(BPDG); this is much lower than the theoretical expectations (≈1) made under the assumption that K∗(1680) is a pure 13D1 state. The product branching fraction B(D0→[K2∗(1980)-→K-η]π+)=(2.2-1.9+1.7)×10-4 is determined. In addition, the πη′ contribution to the a0(980)± resonance shape is confirmed with 10.1σ statistical significance using the three-channel Flatte model. We also measure B(D0→K∗(892)0η)=(1.41-0.12+0.13)%. This is consistent with, and more precise than, the current world average (1.02±0.30)%, deviates with a significance of more than 3σ from the theoretical predictions of (0.51-0.92)%.

Published
2020

81. Histone H3.3 Hira chaperone complex contributes to zygote formation in mice and humans

Author

Richard A. Anderson, K Joo Thong, Sue Pickering, Rowena Smith, Anna Kopakaki, and Chih-Jen Lin

Subjects
Histone H3, medicine.anatomical_structure, Histone, Zygote, Pronucleus, biology, medicine, biology.protein, Chaperone complex, Oocyte, Male pronucleus, Chromatin, Cell biology
Abstract

Elucidating the underlining mechanisms underpinning successful fertilisation is imperative in optimising IVF treatments, and may lead to a specific diagnosis and therefore potential treatment for some infertile couples. One of the critical steps involves paternal chromatin reprogramming, in which compacted sperm chromatin packed by protamines is removed by oocyte factors and new histones, including histone H3.3, are incorporated. This step is critical for the formation of the male pronucleus, without which the zygote contains only 1 pronucleus (1PN), in contrast to normally fertilised zygotes with two-pronuclei (2PN). 1PN zygotes are a frequently observed phenomenon in IVF treatments, therefore aberrant mechanism of action controlling paternal chromatin repackaging may be an important cause of abnormal fertilisation. Hira is the main H3.3 chaperone that governs this protamine-to-histone exchange. In this study, we investigated the maternal functions of two other molecules of the Hira complex, Cabin1 and Ubn1 in the mouse. Loss-of-function Cabin1 and Ubn1 mouse models were developed: their zygotes displayed abnormal 1PN zygote phenotypes, similar to the phenotype of Hira mutants. We then studied human 1PN zygotes, and found that the Hira complex was absent in 1PN zygotes which were lacking the male pronucleus. This result confirms that the role of the Hira complex in male pronucleus formation has coherence from mice to humans. Furthermore, rescue experiments showed that the abnormal 1PN phenotype derived from Hira mutants could be resolved by overexpression of Hira in the mouse oocytes. In summary, we have provided evidence of the role of Hira complex in regulating male pronucleus formation in both mice and humans, that both Cabin1 and Ubn1 components of the Hira complex are equally essential for male pronucleus formation, and that this can be rescued. We present a proof-of-concept experiment that could potentially lead to a personalised IVF therapy for oocyte defects.

Published
2020

82. Evidence for the N′(1720)3/2+ nucleon resonance from combined studies of CLAS π+π−p photo- and electroproduction data

Author

R. W. Gothe, B. S. Ishkhanov, K. Joo, D. S. Carman, Latifa Elouadrhiri, Arjun Trivedi, E. Golovatch, Eugene Pasyuk, N. Markov, V. I. Mokeev, Volker D. Burkert, K. Hicks, and E. L. Isupov

Subjects
Hadronic decay, Physics, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Hadron, Resonance couplings, Resonance, State (functional analysis), Missing resonances, 01 natural sciences, Two pion production, lcsh:QC1-999, Nuclear physics, Baryon, High Energy Physics - Phenomenology, Amplitude, 0103 physical sciences, 010306 general physics, Nucleon, Nuclear Experiment, lcsh:Physics
Abstract

The analysis of the nine 1-fold differential cross sections for the $\gamma_{r,v} p \to \pi^+\pi^-p$ photo- and electroproduction reactions obtained with the CLAS detector at Jefferson Laboratory was carried out with the goal to establish the contributing resonances in the mass range from 1.6~GeV to 1.8~GeV. In order to describe the photo- and electroproduction data with $Q^2$-independent resonance masses and hadronic decay widths in the $Q^2$ range below 1.5~GeV$^2$, it was found that an $N'(1720)3/2^+$ state is required in addition to the already well-established nucleon resonances. This work demonstrates that the combined studies of $\pi^+\pi^-p$ photo- and electroproduction data are vital for the observation of this resonance. The contributions from the $N'(1720)3/2^+$ state and the already established $N(1720)3/2^+$ state with a mass of 1.745~GeV are well separated by their different hadronic decays to the $\pi \Delta$ and $\rho p$ final states and the different $Q^2$-evolution of their photo-/electroexcitation amplitudes. The $N'(1720)3/2^+$ state is the first recently established baryon resonance for which the results on the $Q^2$-evolution of the photo-/electrocouplings have become available. These results are important for the exploration of the nature of the ``missing'' baryon resonances., Comment: accepted for publication in Phys. Lett. B

Published
2020

83. Slow control and monitoring system at the JSNS$^{2}$

Author

H. Jeon, S. Ajimura, Intae Yu, I. Stancu, H. Furuta, S. J. M. Peeters, Tomoyuki Konno, I. S. Yeo, J. S. Jang, E.J. Kim, Y. Hino, H. I. Jang, F. Suekane, S. Monjushiro, D H Lee, C. Yoo, T. Maruyama, J. S. Park, Yorihito Sugaya, R. Ujiie, Gerrit Roellinghoff, K. Nishikawa, J. Spitz, S. Sakamoto, M. Taira, J. W. Choi, Tatsushi Shima, J. Y. Kim, Shin-ichiro Meigo, S. Jeon, Myung-Ki Cheoun, Shoichi Hasegawa, Takeo Kawasaki, J. R. Jordan, D. E. Jung, M. Botran, J. H. Choi, J Goh, C. D. Shin, Minfang Yeh, K. K. Joo, K. Suzuya, Toshihiko Hiraiwa, I. T. Lim, Y. Kasugai, E. Marzec, T. Dodo, Dong Ho Moon, Masaharu Nomachi, Carsten Rott, Sin Kyu Kang, Masahide Harada, M. Jang, H. Ray, T. Nakano, M. Y. Pac, S. Lee, S. B. Kim, W. Kim, A. Zohaib, M. Niiyama, and Kenji Sakai

Subjects
Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Control (management), FOS: Physical sciences, General Physics and Astronomy, Control engineering, Monitoring system, High Energy Physics::Experiment, Instrumentation and Detectors (physics.ins-det)
Abstract

The JSNS$^2$ experiment is aimed to search for sterile neutrino oscillations using a neutrino beam from muon decays at rest. The JSNS$^2$ detector contains 17 tons of 0.1\% gadolinium (Gd) loaded liquid scintillator (LS) as a neutrino target. Detector construction was completed in the spring of 2020. A slow control and monitoring system (SCMS) was implemented for reliable control and quick monitoring of the detector operational status and environmental conditions. It issues an alarm if any of the monitored parameters exceed a preset acceptable range. The SCMS monitors the high voltage (HV) of the photomultiplier tubes (PMTs), the LS level in the detector, possible LS overflow and leakage, the temperature and air pressure in the detector, the humidity of the experimental hall, and the LS flow rate during filling and extraction. An initial 10 days of data-taking with a neutrino beam was done following a successful commissioning of the detector and SCMS in June 2020. In this paper, we present a description of the assembly and installation of the SCMS and its performance., 12 pages, 11 figures

Published
2020

84. Measurement of R(D) and R(D*) with a Semileptonic Tagging Method

Author

A. K. Giri, M. Masuda, S. E. Vahsen, T. V. Dong, K. Chilikin, Tagir Aushev, P. K. Resmi, C.-L. Hsu, C. Beleño, V. Zhukova, K. Trabelsi, Peter Kodys, W. W. Jacobs, S. Di Carlo, G. Karyan, Y. Onuki, A. M. Bakich, N. Dash, Y. Iwasaki, Y. J. Kwon, M. Iwasaki, T. J. Moon, K. Nakamura, Soumen Paul, H. Ono, B. G. Cheon, R. Mussa, Felix Metzner, O. Schneider, H. B. Jeon, F. Di Capua, G. Schnell, M. Rozanska, N. Gabyshev, D. Červenkov, B. G. Fulsom, Jyoti Prakash Biswal, A. Ishikawa, J. Schueler, A. Rabusov, M. Z. Wang, K. Kinoshita, P. Pakhlov, B. Bhuyan, K. K. Joo, Y. Seino, M. Nakao, Toru Iijima, J. Bennett, S. Sandilya, Seokhee Park, J. F. Krohn, E. Won, R. Pestotnik, S. Nishida, Iki Adachi, J. K. Lee, S. Korpar, Y. Choi, K. J. Nath, T. Kuhr, S. C. Lee, D. Kotchetkov, T. Matsuda, Doo Young Kim, G. De Nardo, M. Bračko, V. Babu, T. Sumiyoshi, T. K. Pedlar, Y. Sakai, Rocky Bala Garg, M. Nayak, Martin Ritter, M. Uchida, P. L. Wang, H. Atmacan, Y. Guan, R. Cheaib, L. K. Li, Leo Piilonen, A. Vossen, T. Ferber, V. Savinov, B.A. Shwartz, W. Sutcliffe, H. J. Kim, K. Cho, A. Chen, Phillip Urquijo, Seema Bahinipati, T. Sanuki, A. Garmash, H. Aihara, Hitoshi Yamamoto, Z. S. Stottler, K. Nishimura, Z. Doležal, Y. B. Li, T. Pang, G. B. Mohanty, M. Starič, Frank Simon, D. Liventsev, C. H. Kim, Vladimir Popov, Vladimir Zhulanov, P. Križan, R. Itoh, R. Kroeger, M. E. Sevior, I. S. Lee, V. Shebalin, S. Patra, G.V. Russo, Kevin Varvell, F. Tenchini, D. Joffe, M. Takizawa, P. Goldenzweig, E. Waheed, C. Z. Yuan, Tao Luo, K. Tanida, M. T. Prim, J. G. Shiu, K. T. Kim, W. S. Hou, K. Lieret, P. Oskin, O. Hartbrich, M. Merola, Pavel Krokovny, T. Uglov, D. Matvienko, J. Wiechczynski, T. Mori, D. Greenwald, S. H. Kim, Y. Usov, H. Hayashii, G. Pakhlova, N. K. Nisar, Rakesh Kumar, H. Park, A. Bozek, Dipak Kumar Sahoo, Luka Santelj, K. Senyo, K. H. Kang, J. H. Yin, L. Li Gioi, Z. P. Zhang, Kohei Ogawa, X. L. Wang, E. Solovieva, V. Chekelian, R. Van Tonder, A. B. Kaliyar, K. Inami, D. Epifanov, J. S. Lange, S. Cunliffe, B. Pal, Seongbae Yang, C. MacQueen, H. Ye, A. J. Schwartz, H. Kichimi, Takeo Higuchi, M. Campajola, V.N. Zhilich, D. Ferlewicz, V. Gaur, K. Miyabayashi, I. Badhrees, E. Prencipe, G. Caria, G. Varner, U. Tamponi, S. Al Said, S. Jia, Y. Jin, O. Grzymkowska, C. H. Wang, T. Bilka, T. E. Browder, S. Uno, C. Schwanda, D. Cinabro, J. Libby, D. M. Asner, K. Hayasaka, Takeo Kawasaki, Shoichi Watanuki, Prafulla Kumar Behera, Bo Wang, H. E. Cho, Andrey Sokolov, G. Inguglia, P. Chang, James E. Fast, Somnath Choudhury, and Semen Eidelman

Subjects
Physics, Semileptonic decay, Particle physics, Muon, Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, General Physics and Astronomy, 01 natural sciences, Standard Model, KEKB, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Bar (unit), Lepton
Abstract

The experimental results on the ratios of branching fractions $\mathcal{R}(D) = {\cal B}(\bar{B} \to D \tau^- \bar{\nu}_{\tau})/{\cal B}(\bar{B} \to D \ell^- \bar{\nu}_{\ell})$ and $\mathcal{R}(D^*) = {\cal B}(\bar{B} \to D^* \tau^- \bar{\nu}_{\tau})/{\cal B}(\bar{B} \to D^* \ell^- \bar{\nu}_{\ell})$, where $\ell$ denotes an electron or a muon, show a long-standing discrepancy with the Standard Model predictions, and might hint to a violation of lepton flavor universality. We report a new simultaneous measurement of $\mathcal{R}(D)$ and $\mathcal{R}(D^*)$, based on a data sample containing $772 \times 10^6$ $B\bar{B}$ events recorded at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^+ e^-$ collider. In this analysis the tag-side $B$ meson is reconstructed in a semileptonic decay mode and the signal-side $\tau$ is reconstructed in a purely leptonic decay. The measured values are $\mathcal{R}(D)= 0.307 \pm 0.037 \pm 0.016$ and $\mathcal{R}(D^*) = 0.283 \pm 0.018 \pm 0.014$, where the first uncertainties are statistical and the second are systematic. These results are in agreement with the Standard Model predictions within $0.2$, $1.1$ and $0.8$ standard deviations for $\mathcal{R}(D)$, $\mathcal{R}(D^*)$ and their combination, respectively. This work constitutes the most precise measurements of $\mathcal{R}(D)$ and $\mathcal{R}(D^*)$ performed to date as well as the first result for $\mathcal{R}(D)$ based on a semileptonic tagging method.

Published
2020

85. Search for an Invisibly Decaying Z′ Boson at Belle II in e+e−→μ+μ−(e±μ∓) Plus Missing Energy Final States

Author

I. Ripp-Baudot, F. Meggendorfer, V.N. Zhilich, D. Ferlewicz, E. Nakano, G.V. Russo, N. Akopov, S. Nishida, S. Longo, H. M. Wakeling, A. Pathak, M. De Nuccio, Rocky Bala Garg, L. Cao, Nataliia Kovalchuk, B. Spruck, T. J. Moon, T. Iijima, Soumen Paul, Dipak Kumar Sahoo, C. Kleinwort, K. Kumara, S. Fiore, W. B. Yan, Bumho Kim, C. W. Joo, K. Chilikin, Takeo Higuchi, Felix Metzner, Z. S. Stottler, P. Sartori, G. De Pietro, K. Miyabayashi, L. Zani, C. Wessel, N. K. Nisar, M. Bessner, C. Miller, C. Niebuhr, V. Babu, Abner Soffer, B. Scavino, E. Graziani, E. De La Cruz-Burelo, Elisa Manoni, Yang Chen, S. Reiter, R. Peschke, S. Sandilya, H. Windel, Carlos Marinas, M. Wakai, Marco Milesi, J. Baudot, C. Hadjivasiliou, Yoshinobu Unno, C. Hearty, T. Kuhr, H. G. Moser, I. Komarov, M. Bertemes, M. Nishimura, T. V. Dong, N. Taniguchi, J. H. Yin, U. Tamponi, Antonio Budano, Iki Adachi, Doo Young Kim, Agnese Martini, T. Ferber, A. K. Giri, Z. P. Zhang, V. Gaur, L. B. Rizzuto, T. Sumiyoshi, K. K. Joo, R. Godang, J. C. Mei, B. Paschen, S. Bussino, T. K. Pedlar, Soohyun Cho, S. Kurz, Tariq Aziz, Kohei Ogawa, K. Dort, S. Marcello, L. Corona, Prafulla Kumar Behera, Leo Piilonen, P. Taras, K. Azmi, Martin Ritter, Dmytro Levit, M. Masuda, B. Golob, L. Santelj, J. Gemmler, G. Casarosa, S. Wehle, M. Hernandez Villanueva, K. Inami, A. Vossen, G. Dujany, E. C. Hill, V. Aushev, J. S. Lange, A. Paladino, T. Czank, F. Dattola, T. D. Kimmel, S. Dey, D. Biswas, K. Nishimura, Frank Simon, S. E. Vahsen, A. B. Kaliyar, C. Rosenfeld, R. M. Seddon, A. Hershenhorn, A. Fodor, M. Remnev, A. Sangal, Vladimir Popov, J. Schueler, H. Park, A. Bozek, Kiyoshi Tanida, Sw. Banerjee, Felix Mueller, L. K. Li, M. Merola, S. Jia, Y. Iwasaki, Y. Sakai, E. Paoloni, L. Burmistrov, Pavel Krokovny, D. Dossett, P. K. Resmi, C.-L. Hsu, Y. J. Kwon, G. Finocchiaro, A. Panta, K. Lieret, S. Lacaprara, I. Domínguez Jiménez, R. Cheaib, Tagir Aushev, Seongbae Yang, J. Irakkathil Jabbar, Q. Y. Liu, S. Cunliffe, Makoto Tabata, Jakub Kandra, Andreas Warburton, Jürgen Becker, S. Yamada, E. Prencipe, Z. Doležal, N. Rout, V. Zhukova, Y. Onuki, Xiaopeng Zhou, A. De Yta-Hernandez, D. Červenkov, G. B. Mohanty, Alberto Aloisio, Y. Kato, G. Varner, J. F. Strube, M. C. Chang, M. Z. Wang, Peter Kodys, W. W. Jacobs, B. G. Fulsom, Y. Yusa, M. Nayak, B. Oberhof, T. Koga, A. Passeri, C. P. Shen, Y. Kim, P. Branchini, J. Bennett, M. Takizawa, T. Matsuda, K. Senyo, Enrico Bernieri, G. Karyan, L. Lanceri, S. K. Choi, S. Baehr, P. Gomis, Yi Fan Hu, Florian Urs Bernlochner, F. Di Capua, Shuji Tanaka, H. Aihara, E. Solovieva, G. Muroyama, S. Duell, I. M. Peruzzi, P. Oskin, M. Maggiora, Kevin Varvell, H. Atmacan, S. Y. Suzuki, K. Lautenbach, Pere Rados, G. Rizzo, M. Bračko, G. Pakhlova, Y.-T. Chen, M. Destefanis, M. Piccolo, W. Gradl, Y. Onishchuk, Y. Jin, C. H. Wang, D. Greenwald, A. Vinokurova, J. G. Shiu, S. Dubey, I. Heredia-De La Cruz, D. E. Jaffe, S. Bettarini, F. Müller, S. Spataro, O. Hartbrich, H. Ozaki, K. Cho, H. Miyake, K. Trabelsi, S. H. Kim, Y. Guan, K. Unger, P. Pakhlov, M. Eliachevitch, Rakesh Kumar, A. Kuzmin, V. Savinov, T. M. G. Kraetzschmar, F. Bianchi, C. Z. Yuan, M. Campajola, F. Tenchini, Th. Müller, A. Sibidanov, Yukinori Sato, E. Won, R. A. Briere, S. H. Robertson, R. Pestotnik, Kodai Matsuoka, M. Hoek, E. J. Jang, R. Rasheed, V. Chekelian, D. Rodríguez Pérez, K. Kim, H. Hayashii, H. Ono, R. Van Tonder, H. Ye, M. Barrett, R. Mizuk, L. Li Gioi, Y. B. Li, C. H. Kim, G. De Nardo, M. T. Hedges, Yongsun Kim, B. Gobbo, P. Leitl, Hidekazu Kakuno, Concettina Sfienti, S. Uno, R. Stroili, B. G. Cheon, C. Schwanda, L. M. Cremaldi, D. Cinabro, E. Torassa, Claudia Cecchi, M. V. Purohit, S. Korpar, S. C. Lee, T. Hara, F. Forti, T. Geßler, M. Garcia-Hernandez, E. Ganiev, S. Halder, J. M. Roney, M. Yonenaga, M. Sumihama, M. Watanabe, T. E. Browder, H. Kindo, C. Praz, P. Bambade, J. Libby, D. M. Asner, K. Hayasaka, M. T. Prim, Takeo Kawasaki, Andrey Sokolov, A. Gaz, James E. Fast, Semen Eidelman, J. Kahn, F. Meier, R. Mussa, H. B. Jeon, Bruce Yabsley, S. Stefkova, R. Giordano, G. Inguglia, A. Ishikawa, G. Nazaryan, Y. Seino, M. Kumar, M. Nakao, Somnath Choudhury, P. Križan, S. Kohani, Y. Ushiroda, M. Uchida, Tao Luo, A. Gellrich, Y. Maeda, T. Tsuboyama, D. Matvienko, Q. D. Zhou, J. Wiechczynski, C. La Licata, B.A. Shwartz, M. Starič, D. Liventsev, T. Morii, R. Kroeger, I. S. Lee, P. Goldenzweig, N. Anh Ky, R. de Sangro, Z. Liptak, P. Ahlburg, W. A. T. Wan Abdullah, D. J. Summers, R. Itoh, A. Rostomyan, R. J. Sobie, John Webb, L. Vitale, J. Kumar, D. Neverov, A. Selce, and Vikas Bansal

Subjects
Physics, Coupling constant, Particle physics, Missing energy, Physics beyond the Standard Model, General Physics and Astronomy, 01 natural sciences, law.invention, law, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Collider, Boson
Abstract

Theories beyond the standard model often predict the existence of an additional neutral boson, the Z′. Using data collected by the Belle II experiment during 2018 at the SuperKEKB collider, we perform the first searches for the invisible decay of a Z′ in the process e+e-→μ+μ-Z′ and of a lepton-flavor-violating Z′ in e+e-→e±μZ′. We do not find any excess of events and set 90% credibility level upper limits on the cross sections of these processes. We translate the former, in the framework of an Lμ-Lτ theory, into upper limits on the Z′ coupling constant at the level of 5×10-2-1 for MZ′≤6 GeV/c2.

Published
2020

86. Study of B→pp¯ππ

Author

F. Di Capua, C. P. Shen, R. Kroeger, U. Tamponi, Seok Kim, M. E. Sevior, I. S. Lee, G. Bonvicini, H. Aihara, E. Nakano, A. Vinokurova, A. M. Bakich, K. Chu, R. Mizuk, C. H. Wang, S. Paul, P. Krokovny, V. Babu, D. M. Asner, T. Aushev, Seema Bahinipati, T. V. Dong, K. Cho, T. Ferber, J. E. Fast, Y. Choi, K. J. Nath, L. Li Gioi, H. Ye, C. Beleño, Tao Luo, L. Santelj, K. Chilikin, K. Kinoshita, J. Libby, K. Tanida, D. Epifanov, B. G. Cheon, Y.-T. Lai, V. Bhardwaj, T. K. Pedlar, N. Gabyshev, D. Červenkov, D. Y. Kim, G. Schnell, M. Nayak, M. Merola, J. V. Bennett, T. Mori, Y. Usov, O. Hartbrich, Y. Seino, T. Iijima, W. Sutcliffe, Ya-Qiu Jin, Y. Sakai, K. Lieret, S. Eidelman, D. Matvienko, J. Wiechczynski, P. Pakhlov, S. K. Choi, T. Uglov, S. Korpar, N. Dash, Y. Onuki, Seokhee Park, R. Pestotnik, M. T. Prim, J. G. Shiu, P. K. Resmi, C.-L. Hsu, Z. P. Zhang, H. Hayashii, K. Senyo, S. Uno, C. Schwanda, Meng Wang, Bo Wang, E. Solovieva, D. Cinabro, R. Mussa, H. B. Jeon, Jyoti Prakash Biswal, T. Kawasaki, H. Park, Phillip Urquijo, V. M. Aulchenko, K. Hayasaka, A. Bozek, L. K. Li, Y. Yusa, A. Bobrov, D. Liventsev, A. Ishikawa, V. Gaur, Z. S. Stottler, A. Frey, Peter Kodys, W. W. Jacobs, E. Prencipe, M. Nakao, Victoria Zhukova, M. Takizawa, P. Chang, D. Joffe, H. E. Cho, G. S. Varner, A. Chen, Seongbae Yang, S. Di Carlo, G. Karyan, R. Itoh, P. Križan, A. Vossen, John Yelton, Z. Doležal, Motoki Iwasaki, A. Rostomyan, P. Wang, S. Nishida, Somnath Choudhury, K. Inami, Vladimir Popov, S. Pardi, Doyen Sahoo, A. K. Giri, Shih-Chang Lee, M. Masuda, G. B. Mohanty, K. K. Joo, X. L. Wang, V. Chekelian, T. Nakano, L. Cao, K. Nishimura, V. V. Zhulanov, B. K. Pal, M. Bračko, R. B. Garg, B. Bhuyan, B. G. Fulsom, J. H. Yin, V. Savinov, B. Golob, N. K. Nisar, J. Schueler, C. W. Park, E. Won, T. Pang, G.V. Russo, W. S. Hou, A. Garmash, P. K. Behera, H. Ono, L. E. Piilonen, G. Pakhlova, P. Oskin, Y. Unno, R. Kulasiri, R. Ayad, Iki Adachi, S. Cunliffe, M. Campajola, V.N. Zhilich, S. Al Said, K. Miyabayashi, I. Badhrees, F. Tenchini, T. Sumiyoshi, Martin Ritter, Y. Iwasaki, Y. J. Kwon, O. Schneider, N. Rout, P. Goldenzweig, S. Sandilya, and M. Starič

Subjects
Physics, Research program, Higher education, 010308 nuclear & particles physics, business.industry, media_common.quotation_subject, Library science, 7. Clean energy, 01 natural sciences, Science research, Excellence, 0103 physical sciences, Christian ministry, Russian federation, 010306 general physics, China, business, Research center, media_common
Abstract

We thank the KEKB group for the excellent operation of the accelerator, the KEK cryogenics group for the efficient operation of the solenoid, the KEK computer group and the Pacific Northwest National Laboratory (PNNL) Environmental Molecular Sciences Laboratory (EMSL) computing group for strong computing support, and the National Institute of Informatics and Science Information NETwork 5 (SINET5) for valuable network support. We acknowledge support from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan, the Japan Society for the Promotion of Science (JSPS), and the Tau-Lepton Physics Research Center of Nagoya University; the Australian Research Council including Grants No. DP180102629, No. DP170102389, No. DP170102204, No. DP150103061, and No. FT130100303; the Austrian Science Fund (FWF); the National Natural Science Foundation of China under Contracts No. 11435013, No. 11475187, No. 11521505, No. 11575017, No. 11675166, and No. 11705209; the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS), Grant No. QYZDJ-SSW-SLH011; the CAS Center for Excellence in Particle Physics (CCEPP); the Shanghai Pujiang Program under Grant No. 18PJ1401000; the Ministry of Education, Youth and Sports of the Czech Republic under Contract No. LTT17020; the Carl Zeiss Foundation, the Deutsche Forschungsgemeinschaft, the Excellence Cluster Universe, and the VolkswagenStiftung; the Department of Science and Technology of India; the Istituto Nazionale di Fisica Nucleare of Italy; the National Research Foundation (NRF) of Korea under Grants No. 2015H1A2A1033649, No. 2016R1D1A1B01010135, No. 2016K1A3A7A09005 603, No. 2016R1D1A1B02012900, No. 2018R1A2B3003 643, No. 2018R1A6A1A06024970, and No. 2018R1D1 A1B07047294; the Radiation Science Research Institute, Foreign Large-size Research Facility Application Supporting project, the Global Science Experimental Data Hub Center of theKorea Institute of Science and Technology Information and KREONET/GLORIAD; the Polish Ministry of Science and Higher Education and the National Science Center; the Grant of the Russian Federation Government, Agreement No. 14.W03.31.0026; the Slovenian Research Agency; Ikerbasque, Basque Foundation for Science, Spain; the Swiss National Science Foundation; the Ministry of Education and the Ministry of Science and Technology of Taiwan; and the United States Department of Energy and the National Science Foundation.

Published
2020

87. Search for B+→μ+νμ and B+→μ+N with inclusive tagging

Author

G. Schnell, T. Iijima, A. K. Giri, S. Eidelman, T. Kuhr, M. Masuda, P. Pakhlov, G. B. Mohanty, J. G. Shiu, H. Ono, Philip Lewis, L. Cao, H. Park, A. Bozek, Peter Kodys, G. De Nardo, G. Karyan, R. Mizuk, R. B. Garg, B. Bhuyan, B. G. Fulsom, T. E. Browder, Bo Wang, Rahul Kumar, C. Beleño, A. Garmash, D. Matvienko, K. Hayasaka, A. Bobrov, B. G. Cheon, V.E. Shebalin, H. E. Cho, Y. Choi, K. J. Nath, T. Hara, L. Santelj, V. Bansal, D. M. Asner, Florian Urs Bernlochner, C. Kiesling, V. Savinov, Jyoti Prakash Biswal, Andrey Sokolov, S. Al Said, J. Haba, M. Niiyama, F. Tenchini, P. Goldenzweig, Seokhee Park, A. B. Kaliyar, Shih-Chang Lee, S. Korpar, M. Bračko, P. K. Behera, S. Nishida, K. Senyo, J. K. Lee, V. Gaur, M. Heck, K. Nishimura, J. Schueler, E. Won, M. Nakao, Y. Unno, V. Babu, T. Aushev, M. Starič, Victoria Zhukova, V. V. Zhulanov, T. Kawasaki, J. MacNaughton, T. Sumiyoshi, L. Li Gioi, Martin Ritter, Jihwa Lee, E. Prencipe, M. Campajola, K. Lalwani, J. F. Strube, M. Uchida, T. Kumita, T. Matsuda, A. Chen, S. Uno, C. Schwanda, H. Atmacan, T. Ferber, S. Ogawa, V. Chekelian, R. Ayad, Felix Metzner, D. Liventsev, M. Merola, H. Hayashii, Z. P. Zhang, S. E. Vahsen, R. Van Tonder, B. K. Pal, Z. Natkaniec, G. S. Varner, L. E. Piilonen, C. H. Kim, B. Shwartz, K. K. Joo, K. Adamczyk, G. Pakhlova, R. Kulasiri, A. Rostomyan, P. Wang, D. Y. Kim, G.V. Russo, H. Ye, Y. Iwasaki, Y. J. Kwon, M. Z. Wang, M. Nayak, K. Kinoshita, Nils Braun, T. Uglov, K. Chilikin, V.N. Zhilich, Kevin Varvell, Sudhanwa Patra, Y. Yusa, Ya-Qiu Jin, A. Vinokurova, O. Schneider, Y. Tao, H. Aihara, Y. Usov, K. Miyabayashi, R. Mussa, P. C. Lu, W. S. Hou, A. Ishikawa, M. Sumihama, Alexei Kuzmin, A. M. Bakich, Motoki Iwasaki, Y. Ushiroda, K. Trabelsi, P. Križan, C. H. Li, I. Adachi, P. Krokovny, Seok Kim, J. E. Fast, M. Rozanska, Doyen Sahoo, D. Kotchetkov, W. Sutcliffe, Y. Onuki, D. Červenkov, K. Cho, S. Cunliffe, Y. Guan, V. M. Aulchenko, R. Pestotnik, D. Epifanov, T. Bilka, J. H. Yin, V. Bhardwaj, T. K. Pedlar, U. Tamponi, S. Jia, O. Grzymkowska, C. H. Wang, K. Inami, S. Paul, N. K. Nisar, Y. Sakai, J. S. Lange, K. Lieret, E. Solovieva, D. Joffe, Seongbae Yang, Frank Simon, Vladimir Popov, D. Cinabro, G. Inguglia, P. Chang, Somnath Choudhury, J. Libby, Y. Seino, M. T. Prim, Shoichi Watanuki, S. Pardi, M. Takizawa, Z. Doležal, K. T. Kim, R. Kroeger, M. E. Sevior, I. S. Lee, Tao Luo, and H. Kichimi

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, Rest frame, Type (model theory), Coupling (probability), 01 natural sciences, Helicity, Standard Model, 0103 physical sciences, High Energy Physics::Experiment, B meson, Sensitivity (control systems), 010306 general physics
Abstract

We report the result for a search for the leptonic decay of B$^{+}$ → μ$^{+}$ν$_{μ}$ using the full Belle dataset of 711 fb$^{-1}$ of integrated luminosity at the ϒ(4S) resonance. In the Standard Model leptonic B-meson decays are helicity and Cabibbo-Kobayashi-Maskawa suppressed. To maximize sensitivity an inclusive tagging approach is used to reconstruct the second B meson produced in the collision. The directional information from this second B meson is used to boost the observed μ into the signal B-meson rest frame, in which the μ has a monochromatic momentum spectrum. Though its momentum is smeared by the experimental resolution, this technique improves the analysis sensitivity considerably. Analyzing the μ momentum spectrum in this frame we find B(B$^{+}$ → μ$^{+}$ν$_{μ}$) = 5.3 ± 2.0 ± 0.9) × 10$^{-7}$ with a one-sided significance of 2.8 standard deviations over the background-only hypothesis. This translates to a frequentist upper limit of B(B$^{+}$ → μ$^{+}$ν$_{μ}$) < 8.6 × 10$^{-7}$ at 90% confidence level. The experimental spectrum is then used to search for a massive sterile neutrino, B$^{+}$ → μ$^{+}$N, but no evidence is observed for a sterile neutrino with a mass in a range of 0–1.5 GeV. The determined B$^{+}$ → μ$^{+}$ν$_{μ}$ branching fraction limit is further used to constrain the mass and coupling space of the type II and type III two-Higgs-doublet models.

Published
2020

88. Exclusive π0p electroproduction off protons in the resonance region at photon virtualities 0.4GeV2≤Q2≤1GeV2

Author

P. Eugenio, M. Taiuti, Carlos A. Salgado, L. C. Smith, I. I. Strakovsky, B. S. Ishkhanov, R. Dupre, M. Battaglieri, Aditya R. Khanal, A. Deur, R. A. Schumacher, M. Contalbrigo, Michael Paolone, F. Bossu, C. Evans, Maxime Defurne, N. Tyler, C. Djalali, J. A. Tan, K. A. Griffioen, Pawel Nadel-Turonski, Fatiha Benmokhtar, O. Soto, R. De Vita, M. Ungaro, S. Niccolai, L. Lanza, A. D'Angelo, A. Kim, Alessandro Rizzo, T. Mineeva, S. Stepanyan, W. Kim, U. Shrestha, V. Crede, L. El Fassi, T. B. Hayward, H. Atac, R. Paremuzyan, P. Stoler, K. Joo, D. G. Jenkins, M. Leali, K. Hicks, G. Ciullo, William Brooks, N. Markov, M. Guidal, G. Niculescu, Y. Prok, L. Venturelli, W. Phelps, E. De Sanctis, V. Mascagna, I. Bedlinskiy, E. Golovatch, D. S. Carman, A. Celentano, R. W. Gothe, E. L. Isupov, M. Holtrop, Nikos Sparveris, C. W. Kim, Luciano Pappalardo, X. Wei, F. X. Girod, S. Boiarinov, G. Angelini, H. Avakian, J. W. Price, P. L. Cole, G. Rosner, N. A. Baltzell, T. Chetry, J. Rowley, K. Park, D. Sokhan, Y. Ghandilyan, F. Sabatié, Y. G. Sharabian, H. Hakobyan, H. S. Jo, E. Voutier, S. Diehl, D. G. Ireland, I. J. D. MacGregor, N. Dashyan, Volker D. Burkert, A. S. Biselli, S. Strauch, S. Adhikari, M. H. Wood, M. Osipenko, P. Chatagnon, B. McKinnon, Yordanka Ilieva, V. Mokeev, M. Mirazita, Rong Wang, M. Ehrhart, L. Barion, M. Hattawy, H. Voskanyan, S. K. Nanda, M. Ripani, M. Khachatryan, W. J. Briscoe, D. Marchand, E. Pasyuk, V. P. Kubarovsky, D. Riser, A. El Alaoui, C. Ayerbe Gayoso, Nicholas Zachariou, J. C. Carvajal, O. Pogorelko, D. Protopopescu, Frank Klein, Dustin Keller, K. Livingston, K. Hafidi, M. J. Amaryan, A. Filippi, and M. Khandaker

Subjects
Physics, Range (particle radiation), Photon, Proton, 010308 nuclear & particles physics, Resonance, 01 natural sciences, Nuclear physics, Cross section (physics), Isospin, 0103 physical sciences, Invariant mass, 010306 general physics, Legendre polynomials
Abstract

The exclusive electroproduction process ep→e′p′π0 was measured in the range of photon virtualities Q2=0.4–1.0GeV2 and the invariant mass range of the pπ0 system of W=1.1–1.8 GeV. These kinematics are covered in exclusive π0 electroproduction off the proton with nearly complete angular coverage in the pπ0 center-of-mass system and with high statistical accuracy. Nearly 36 000 cross-section points were measured, and the structure functions σT+eσL,σLT, and σTT, were extracted via fitting the ϕπ0 dependence of the cross section. A Legendre polynomial expansion analysis demonstrates the sensitivity of our data to high-lying N* and Δ* resonances with M>1.6 GeV. As part of a broad effort to determine the electrocouplings of the N* and Δ* resonances using both single- and double-pion electroproduction, this dataset is crucial for the reliable extraction of the high-lying resonance electrocouplings from the combined isospin analysis of the Nπ and π+π−p channels.

Published
2020

89. Search for an Invisibly Decaying Z′ Boson at Belle II in e+e- →μ+μ- (e±μ) Plus Missing Energy Final States

Author

I, Adachi, P, Ahlburg, H, Aihara, N, Akopov, A, Aloisio, N, Anh Ky, D M, Asner, H, Atmacan, T, Aushev, V, Aushev, T, Aziz, V, Babu, S, Baehr, P, Bambade, Sw, Banerjee, V, Bansal, M, Barrett, J, Baudot, J, Becker, P K, Behera, J V, Bennett, E, Bernieri, F U, Bernlochner, M, Bertemes, M, Bessner, S, Bettarini, F, Bianchi, D, Biswas, A, Bozek, M, Bračko, P, Branchini, R A, Briere, T E, Browder, A, Budano, L, Burmistrov, S, Bussino, M, Campajola, L, Cao, G, Casarosa, C, Cecchi, D, Červenkov, M-C, Chang, R, Cheaib, V, Chekelian, Y Q, Chen, Y-T, Chen, B G, Cheon, K, Chilikin, K, Cho, S, Cho, S-K, Choi, S, Choudhury, D, Cinabro, L, Corona, L M, Cremaldi, S, Cunliffe, T, Czank, F, Dattola, E, De La Cruz-Burelo, G, De Nardo, M, De Nuccio, G, De Pietro, R, de Sangro, M, Destefanis, S, Dey, A, De Yta-Hernandez, F, Di Capua, Z, Doležal, I, Domínguez Jiménez, T V, Dong, K, Dort, D, Dossett, S, Dubey, S, Duell, G, Dujany, S, Eidelman, M, Eliachevitch, J E, Fast, T, Ferber, D, Ferlewicz, G, Finocchiaro, S, Fiore, A, Fodor, F, Forti, B G, Fulsom, E, Ganiev, M, Garcia-Hernandez, R, Garg, V, Gaur, A, Gaz, A, Gellrich, J, Gemmler, T, Geßler, R, Giordano, A, Giri, B, Gobbo, R, Godang, P, Goldenzweig, B, Golob, P, Gomis, W, Gradl, E, Graziani, D, Greenwald, Y, Guan, C, Hadjivasiliou, S, Halder, T, Hara, O, Hartbrich, K, Hayasaka, H, Hayashii, C, Hearty, M T, Hedges, I, Heredia de la Cruz, M, Hernández Villanueva, A, Hershenhorn, T, Higuchi, E C, Hill, M, Hoek, C-L, Hsu, Y, Hu, T, Iijima, K, Inami, G, Inguglia, J, Irakkathil Jabbar, A, Ishikawa, R, Itoh, Y, Iwasaki, W W, Jacobs, D E, Jaffe, E-J, Jang, H B, Jeon, S, Jia, Y, Jin, C, Joo, K K, Joo, J, Kahn, H, Kakuno, A B, Kaliyar, J, Kandra, G, Karyan, Y, Kato, T, Kawasaki, B H, Kim, C-H, Kim, D Y, Kim, K-H, Kim, S-H, Kim, Y K, Kim, Y, Kim, T D, Kimmel, H, Kindo, C, Kleinwort, P, Kodyš, T, Koga, S, Kohani, I, Komarov, S, Korpar, N, Kovalchuk, T M G, Kraetzschmar, P, Križan, R, Kroeger, P, Krokovny, T, Kuhr, J, Kumar, M, Kumar, R, Kumar, K, Kumara, S, Kurz, A, Kuzmin, Y-J, Kwon, S, Lacaprara, C, La Licata, L, Lanceri, J S, Lange, K, Lautenbach, I-S, Lee, S C, Lee, P, Leitl, D, Levit, L K, Li, Y B, Li, J, Libby, K, Lieret, L, Li Gioi, Z, Liptak, Q Y, Liu, D, Liventsev, S, Longo, T, Luo, Y, Maeda, M, Maggiora, E, Manoni, S, Marcello, C, Marinas, A, Martini, M, Masuda, T, Matsuda, K, Matsuoka, D, Matvienko, F, Meggendorfer, J C, Mei, F, Meier, M, Merola, F, Metzner, M, Milesi, C, Miller, K, Miyabayashi, H, Miyake, R, Mizuk, K, Azmi, G B, Mohanty, T, Moon, T, Morii, H-G, Moser, F, Mueller, F J, Müller, Th, Muller, G, Muroyama, R, Mussa, E, Nakano, M, Nakao, M, Nayak, G, Nazaryan, D, Neverov, C, Niebuhr, N K, Nisar, S, Nishida, K, Nishimura, M, Nishimura, B, Oberhof, K, Ogawa, Y, Onishchuk, H, Ono, Y, Onuki, P, Oskin, H, Ozaki, P, Pakhlov, G, Pakhlova, A, Paladino, A, Panta, E, Paoloni, H, Park, B, Paschen, A, Passeri, A, Pathak, S, Paul, T K, Pedlar, I, Peruzzi, R, Peschke, R, Pestotnik, M, Piccolo, L E, Piilonen, V, Popov, C, Praz, E, Prencipe, M T, Prim, M V, Purohit, P, Rados, R, Rasheed, S, Reiter, M, Remnev, P K, Resmi, I, Ripp-Baudot, M, Ritter, G, Rizzo, L B, Rizzuto, S H, Robertson, D, Rodríguez Pérez, J M, Roney, C, Rosenfeld, A, Rostomyan, N, Rout, G, Russo, D, Sahoo, Y, Sakai, S, Sandilya, A, Sangal, L, Santelj, P, Sartori, Y, Sato, V, Savinov, B, Scavino, J, Schueler, C, Schwanda, R M, Seddon, Y, Seino, A, Selce, K, Senyo, C, Sfienti, C P, Shen, J-G, Shiu, B, Shwartz, A, Sibidanov, F, Simon, R J, Sobie, A, Soffer, A, Sokolov, E, Solovieva, S, Spataro, B, Spruck, M, Starič, S, Stefkova, Z S, Stottler, R, Stroili, J, Strube, M, Sumihama, T, Sumiyoshi, D J, Summers, S Y, Suzuki, M, Tabata, M, Takizawa, U, Tamponi, S, Tanaka, K, Tanida, N, Taniguchi, P, Taras, F, Tenchini, E, Torassa, K, Trabelsi, T, Tsuboyama, M, Uchida, K, Unger, Y, Unno, S, Uno, Y, Ushiroda, S E, Vahsen, R, van Tonder, G S, Varner, K E, Varvell, A, Vinokurova, L, Vitale, A, Vossen, M, Wakai, H M, Wakeling, W, Wan Abdullah, C H, Wang, M-Z, Wang, A, Warburton, M, Watanabe, J, Webb, S, Wehle, C, Wessel, J, Wiechczynski, H, Windel, E, Won, B, Yabsley, S, Yamada, W, Yan, S B, Yang, H, Ye, J H, Yin, M, Yonenaga, C Z, Yuan, Y, Yusa, L, Zani, Z, Zhang, V, Zhilich, Q D, Zhou, X Y, Zhou, V I, Zhukova, Adachi, I., Ahlburg, P., Aihara, H., Akopov, N., Aloisio, A., Anh Ky, N., Asner, D. M., Atmacan, H., Aushev, T., Aushev, V., Aziz, T., Babu, V., Baehr, S., Bambade, P., Banerjee, Sw., Bansal, V., Barrett, M., Baudot, J., Becker, J., Behera, P. K., Bennett, J. V., Bernieri, E., Bernlochner, F. U., Bertemes, M., Bessner, M., Bettarini, S., Bianchi, F., Biswas, D., Bozek, A., Bračko, M., Branchini, P., Briere, R. A., Browder, T. E., Budano, A., Burmistrov, L., Bussino, S., Campajola, M., Cao, L., Casarosa, G., Cecchi, C., Červenkov, D., Chang, M. -C., Cheaib, R., Chekelian, V., Chen, Y. Q., Chen, Y. -T., Cheon, B. G., Chilikin, K., Cho, K., Cho, S., Choi, S. -K., Choudhury, S., Cinabro, D., Corona, L., Cremaldi, L. M., Cunliffe, S., Czank, T., Dattola, F., De La Cruz-Burelo, E., De Nardo, G., De Nuccio, M., De Pietro, G., de Sangro, R., Destefanis, M., Dey, S., De Yta-Hernandez, A., Di Capua, F., Doležal, Z., Domínguez Jiménez, I., Dong, T. V., Dort, K., Dossett, D., Dubey, S., Duell, S., Dujany, G., Eidelman, S., Eliachevitch, M., Fast, J. E., Ferber, T., Ferlewicz, D., Finocchiaro, G., Fiore, S., Fodor, A., Forti, F., Fulsom, B. G., Ganiev, E., Garcia-Hernandez, M., Garg, R., Gaur, V., Gaz, A., Gellrich, A., Gemmler, J., Geßler, T., Giordano, R., Giri, A., Gobbo, B., Godang, R., Goldenzweig, P., Golob, B., Gomis, P., Gradl, W., Graziani, E., Greenwald, D., Guan, Y., Hadjivasiliou, C., Halder, S., Hara, T., Hartbrich, O., Hayasaka, K., Hayashii, H., Hearty, C., Hedges, M. T., Heredia de la Cruz, I., Hernández Villanueva, M., Hershenhorn, A., Higuchi, T., Hill, E. C., Hoek, M., Hsu, C. -L., Hu, Y., Iijima, T., Inami, K., Inguglia, G., Irakkathil Jabbar, J., Ishikawa, A., Itoh, R., Iwasaki, Y., Jacobs, W. W., Jaffe, D. E., Jang, E. -J., Jeon, H. B., Jia, S., Jin, Y., Joo, C., Joo, K. K., Kahn, J., Kakuno, H., Kaliyar, A. B., Kandra, J., Karyan, G., Kato, Y., Kawasaki, T., Kim, B. H., Kim, C. -H., Kim, D. Y., Kim, K. -H., Kim, S. -H., Kim, Y. K., Kim, Y., Kimmel, T. D., Kindo, H., Kleinwort, C., Kodyš, P., Koga, T., Kohani, S., Komarov, I., Korpar, S., Kovalchuk, N., Kraetzschmar, T. M. G., Križan, P., Kroeger, R., Krokovny, P., Kuhr, T., Kumar, J., Kumar, M., Kumar, R., Kumara, K., Kurz, S., Kuzmin, A., Kwon, Y. -J., Lacaprara, S., La Licata, C., Lanceri, L., Lange, J. S., Lautenbach, K., Lee, I. -S., Lee, S. C., Leitl, P., Levit, D., Li, L. K., Li, Y. B., Libby, J., Lieret, K., Li Gioi, L., Liptak, Z., Liu, Q. Y., Liventsev, D., Longo, S., Luo, T., Maeda, Y., Maggiora, M., Manoni, E., Marcello, S., Marinas, C., Martini, A., Masuda, M., Matsuda, T., Matsuoka, K., Matvienko, D., Meggendorfer, F., Mei, J. C., Meier, F., Merola, M., Metzner, F., Milesi, M., Miller, C., Miyabayashi, K., Miyake, H., Mizuk, R., Azmi, K., Mohanty, G. B., Moon, T., Morii, T., Moser, H. -G., Mueller, F., Müller, F. J., Muller, Th., Muroyama, G., Mussa, R., Nakano, E., Nakao, M., Nayak, M., Nazaryan, G., Neverov, D., Niebuhr, C., Nisar, N. K., Nishida, S., Nishimura, K., Nishimura, M., Oberhof, B., Ogawa, K., Onishchuk, Y., Ono, H., Onuki, Y., Oskin, P., Ozaki, H., Pakhlov, P., Pakhlova, G., Paladino, A., Panta, A., Paoloni, E., Park, H., Paschen, B., Passeri, A., Pathak, A., Paul, S., Pedlar, T. K., Peruzzi, I., Peschke, R., Pestotnik, R., Piccolo, M., Piilonen, L. E., Popov, V., Praz, C., Prencipe, E., Prim, M. T., Purohit, M. V., Rados, P., Rasheed, R., Reiter, S., Remnev, M., Resmi, P. K., Ripp-Baudot, I., Ritter, M., Rizzo, G., Rizzuto, L. B., Robertson, S. H., Rodríguez Pérez, D., Roney, J. M., Rosenfeld, C., Rostomyan, A., Rout, N., Russo, G., Sahoo, D., Sakai, Y., Sandilya, S., Sangal, A., Santelj, L., Sartori, P., Sato, Y., Savinov, V., Scavino, B., Schueler, J., Schwanda, C., Seddon, R. M., Seino, Y., Selce, A., Senyo, K., Sfienti, C., Shen, C. P., Shiu, J. -G., Shwartz, B., Sibidanov, A., Simon, F., Sobie, R. J., Soffer, A., Sokolov, A., Solovieva, E., Spataro, S., Spruck, B., Starič, M., Stefkova, S., Stottler, Z. S., Stroili, R., Strube, J., Sumihama, M., Sumiyoshi, T., Summers, D. J., Suzuki, S. Y., Tabata, M., Takizawa, M., Tamponi, U., Tanaka, S., Tanida, K., Taniguchi, N., Taras, P., Tenchini, F., Torassa, E., Trabelsi, K., Tsuboyama, T., Uchida, M., Unger, K., Unno, Y., Uno, S., Ushiroda, Y., Vahsen, S. E., van Tonder, R., Varner, G. S., Varvell, K. E., Vinokurova, A., Vitale, L., Vossen, A., Wakai, M., Wakeling, H. M., Wan Abdullah, W., Wang, C. H., Wang, M. -Z., Warburton, A., Watanabe, M., Webb, J., Wehle, S., Wessel, C., Wiechczynski, J., Windel, H., Won, E., Yabsley, B., Yamada, S., Yan, W., Yang, S. B., Ye, H., Yin, J. H., Yonenaga, M., Yuan, C. Z., Yusa, Y., Zani, L., Zhang, Z., Zhilich, V., Zhou, Q. D., Zhou, X. Y., and Zhukova, V. I.

Subjects
High Energy Physics::Experiment
Abstract

Theories beyond the standard model often predict the existence of an additional neutral boson, the Z^{'}. Using data collected by the Belle II experiment during 2018 at the SuperKEKB collider, we perform the first searches for the invisible decay of a Z^{'} in the process e^{+}e^{-}→μ^{+}μ^{-}Z^{'} and of a lepton-flavor-violating Z^{'} in e^{+}e^{-}→e^{±}μ^{∓}Z^{'}. We do not find any excess of events and set 90% credibility level upper limits on the cross sections of these processes. We translate the former, in the framework of an L_{μ}-L_{τ} theory, into upper limits on the Z^{'} coupling constant at the level of 5×10^{-2}-1 for M_{Z^{'}}≤6 GeV/c^{2}.

Published
2020

90. Beam–target helicity asymmetry $E$ in $K^+$ $\Sigma^-$ photoproduction on the neutron

Author

R. De Vita, D. Marchand, H. Atac, H. S. Jo, A. Filippi, L. Marsicano, N. K. Walford, O. Soto, M. Khandaker, I. J. D. MacGregor, K. Hicks, W. Phelps, R. A. Schumacher, Michael Paolone, H. Hakobyan, W. Kim, G. Charles, F. Bossu, H. Lu, S. Joosten, J. W. Price, S. Diehl, C. Salgado, William Brooks, L. Venturelli, D. Heddle, V. P. Kubarovsky, I. Bedlinskiy, Z. E. Meziani, V. Mascagna, A. Celentano, R. W. Gothe, N. Markov, Alessandro Rizzo, W. Gohn, G. Asryan, Axel Schmidt, Dustin Keller, M. Ungaro, M. Guidal, M. Contalbrigo, M. Osipenko, Z. W. Zhao, Fatiha Benmokhtar, E. L. Isupov, Y. Prok, J. Poudel, O. Pogorelko, A. I. Ostrovidov, K. Park, M. J. Amaryan, Michael Wood, K. Hafidi, M. Holtrop, M. Ehrhart, C.D. Bass, V. A. Nikonov, A. D'Angelo, D. G. Jenkins, D. G. Ireland, G. Rosner, S. Boiarinov, E. Golovatch, P. Eugenio, K. Livingston, Luciano Pappalardo, K. Joo, M. Leali, Jie Zhang, T. Kageya, Volker D. Burkert, Y. Ghandilyan, A. S. Biselli, C. W. Kim, G. Gavalian, U. Shrestha, F.-X. Girod, Gerard Gilfoyle, M. Ripani, R. G. Fersch, H. Voskanyan, A. El Alaoui, G. Angelini, Nicholas Zachariou, J. C. Carvajal, W. J. Briscoe, P. L. Cole, T. Chetry, N. Gevorgyan, D. Ho, I. I. Strakovsky, A. M. Sandorfi, A. Deur, Victor Mokeev, D. Sokhan, T. R. O'Connell, Chaden Djalali, P. Nadel Turonski, T. Mineeva, M. Bashkanov, S. Adhikari, D. Bulumulla, E. Munevar, B. McKinnon, B. S. Ishkhanov, Aditya R. Khanal, Andrea Bianconi, I. Zonta, X. Wei, P. Peng, Hovanes Egiyan, C. Munoz Camacho, P. Lenisa, M. Hattawy, J. A. Fleming, Friedrich Klein, Brian Raue, Andrew Puckett, E. Voutier, Martin K. Mayer, M. Khachatryan, K. A. Griffioen, Nikolaos Sparveris, K. P. Adhikari, C. S. Whisnant, C. Hanretty, L. Lanza, R. Dupre, M. Battaglieri, M. Lowry, S. Strauch, Eugene Pasyuk, N. Dashyan, Yordanka Ilieva, L. Barion, G. Ciullo, D. S. Carman, S. Fegan, D. P. Watts, A. V. Sarantsev, N. Tyler, J. A. Tan, P. Chatagnon, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and CLAS

Subjects
Nuclear and High Energy Physics, Socio-culturale, nucleon resonance, Nucleons, Photoproduction, Mesons, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, K+: photoproduction, Particle identification, Nuclear physics, chemistry.chemical_compound, PE2_2, PE2_1, CLAS, 0103 physical sciences, Neutron, Hydrogen deuteride, n: target, 010306 general physics, Nuclear Experiment, PE2_3, photon: beam, Physics, 010308 nuclear & particles physics, nucleus: target, Settore FIS/04, Resonance, helicity: asymmetry, Observable, Sigma-: photoproduction, Helicity, lcsh:QC1-999, chemistry, Excited state, spectrometer, Nucleon, lcsh:Physics, Jefferson Lab, experimental results
Abstract

We report a measurement of a beam–target double-polarisation observable (E) for the γ→n→(p)→K+Σ−(p) reaction. The data were obtained impinging the circularly-polarised energy-tagged photon beam of Hall B at Jefferson Lab on a longitudinally-polarised frozen-spin hydrogen deuteride (HD) nuclear target. The E observable for an effective neutron target was determined for centre-of-mass energies 1.70≤W≤2.30 GeV, with reaction products detected over a wide angular acceptance by the CLAS spectrometer. These new double-polarisation data give unique constraints on the strange decays of excited neutron states. Inclusion of the new data within the Bonn-Gatchina theoretical model results in significant changes for the extracted photocouplings of a number of established nucleon resonances. Possible improvements in the PWA description of the experimental data with additional “missing” resonance states, including the N(2120)3/2− resonance, are also quantified.

Published
2020

91. The CLAS12 Spectrometer at Jefferson Laboratory

Author

C. W. Kim, H. Avakian, D. Protopopescu, D. Heddle, M. Contalbrigo, M. L. Kabir, H. Voskanyan, E. Voutier, T. Chetry, M. Zarecky, J. Poudel, I. Illari, B. A. Clary, M. Osipenko, D. Insley, D. P. Watts, I. Bedlinskiy, Michael Paolone, V. Sergeyeva, D. Kashy, M. Khachatryan, F. Hauenstein, V. Mascagna, Nikolaos Sparveris, F. Bossu, D. Marchand, W. Kim, G. Niculescu, P. Bonneau, G. Charles, P. Hemler, Ruben J. Fair, P. Moran, Dustin Keller, C. Ayerbe Gayoso, Nicholas Zachariou, M. Ungaro, C. Munoz Camacho, M. J. Amaryan, G. Rosner, I. J. D. MacGregor, T. A. Forest, V. Lucherini, S. E. Kuhn, Y. Prok, M. Hattawy, S. Stepanyan, Michael Wood, K. Hafidi, M. D. Mestayer, S. Lee, M. Wiseman, F. Sabatié, R. Paremuzyan, N. Dashyan, A. Deur, K. Hicks, K. Joo, E. L. Isupov, N. A. Baltzell, R. W. Gothe, S. Christo, L. C. Smith, B. S. Ishkhanov, Latifa Elouadrhiri, V. Baturin, Nicholas M. Harrison, Gerard Gilfoyle, M. McMullen, G. E. Dodge, H. S. Jo, R. Johnston, A. Yegneswaran, K. Livingston, A. Lung, P. Stoler, M. Guidal, D. Sokhan, K. Price, Aditya R. Khanal, K. P. Adhikari, Jie Zhang, K. Bruhwel, S. Adhikari, S. Boyarinov, B. McKinnon, M. Ehrhart, M. Leali, Z. W. Zhao, S. Joosten, B. J. Roy, V. P. Kubarovsky, J. Newton, P. Chatagnon, G. V. Fedotov, D. Tilles, M.A. Antonioli, Renuka Rajput-Ghoshal, G. D. Smith, M. Holtrop, C. Cuevas, V. Gyurjyan, Probir K. Ghoshal, Yordanka Ilieva, H. Hakobyan, Alexander Schmidt, Luciano Pappalardo, Andrea Bianconi, W. J. Briscoe, M. Turisini, M. Mirazita, D. I. Glazier, M. Garçon, M. Ripani, F. X. Girod, A. Filippi, K. L. Giovanetti, R. Miller, J. Ritman, S. Diehl, R. De Vita, C. D. Keith, Y. G. Sharabian, M. Lowry, M. Defurne, E. Pasyuk, P. Naidoo, J. Hogan, N. Markov, Or Hen, C. Salgado, M. Taylor, G. Young, S. Strauch, Larry Weinstein, H. Atac, Chaden Djalali, A. Hobart, A. Kim, Z. E. Meziani, S. Schadmand, U. Shrestha, T. Ewing, T. Mineeva, O. Pogorelko, S. Nanda, L. Barion, G. Angelini, J. Rowley, P. Rossi, M. Leffel, William Brooks, I. Mandjavidze, L. Venturelli, Iu. Skorodumina, Y. Gotra, C. Mealer, J. W. Price, S. Aune, C. Wiggins, D. G. Ireland, G. Gavalian, G. Jacobs, V. Crede, Volker D. Burkert, A. S. Biselli, O. Pastor, Victor Mokeev, E.P. Segarra, Ross Milner, N. Tyler, J. A. Tan, E. Golovatch, R. Dupre, W. Phelps, Andrea Celentano, S. Procureur, M. Cook, G. Ciullo, M. Battaglieri, D. S. Carman, B. Raydo, A. Rizzo, X. Wei, R. Cruz-Torres, S. Niccolai, K. A. Griffioen, B. Eng, A. Movsisyan, P. L. Cole, L. Lanza, G. Christiaens, A. D'Angelo, T. Kageya, L. El Fassi, P. Lenisa, V. Ziegler, C. Hanretty, D. Anderson, T. B. Hayward, Brian Raue, Fatiha Benmokhtar, O. Soto, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics::Instrumentation and Detectors, data acquisition, magnet: solenoid, superconductivity: torus, Solenoid, 01 natural sciences, Particle identification, Luminosity, momentum resolution, electron: beam, Nuclear Experiment, Instrumentation, QC, Physics, Luminosity (scattering theory), Settore FIS/04, Detector, Magnetic spectrometer, magnet: torus, performance, Nuclear and High Energy Physics, Meson, vertex detector, nucleon: interaction, CLAS12, Electromagnetic physics, Large acceptance, Socio-culturale, fabrication, beam: energy, Nuclear physics, PE2_1, CLAS, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, PE2_3, scintillation counter, Cherenkov radiation, detector: design, activity report, Spectrometer, 010308 nuclear & particles physics, nucleus, CLAS12, Electromagnetic physics, Large acceptance, Luminosity, Magnetic spectrometer, magnet: superconductivity, magnetic spectrometer, electromagnetic physics, large acceptance, luminosity, neutral particle, Automatic Keywords, calorimeter: electromagnetic, Cherenkov counter, spectrometer, particle identification, Beam (structure)
Abstract

International audience; The CEBAF Large Acceptance Spectrometer for operation at 12 GeV beam energy (CLAS12) in Hall B at Jefferson Laboratory is used to study electro-induced nuclear and hadronic reactions. This spectrometer provides efficient detection of charged and neutral particles over a large fraction of the full solid angle. CLAS12 has been part of the energy-doubling project of Jefferson Lab’s Continuous Electron Beam Accelerator Facility, funded by the United States Department of Energy. An international collaboration of 48 institutions contributed to the design and construction of detector hardware, developed the software packages for the simulation of complex event patterns, and commissioned the detector systems. CLAS12 is based on a dual-magnet system with a superconducting torus magnet that provides a largely azimuthal field distribution that covers the forward polar angle range up to 35 ∘ , and a solenoid magnet and detector covering the polar angles from 35° to 125° with full azimuthal coverage. Trajectory reconstruction in the forward direction using drift chambers and in the central direction using a vertex tracker results in momentum resolutions of < 1% and < 3%, respectively. Cherenkov counters, time-of-flight scintillators, and electromagnetic calorimeters provide good particle identification. Fast triggering and high data-acquisition rates allow operation at a luminosity of 1035 cm −2 s −1 . These capabilities are being used in a broad program to study the structure and interactions of nucleons, nuclei, and mesons, using polarized and unpolarized electron beams and targets for beam energies up to 11 GeV. This paper gives a general description of the design, construction, and performance of CLAS12.

Published
2020

92. First search for the ηc2(1D) in B decays at Belle

Author

F. Di Capua, P. Pakhlov, H. Aihara, J. Biswal, Tagir Aushev, S. Nishida, R. Mussa, M. Uchida, W. B. Yan, Z. Natkaniec, C. MacQueen, Leo Piilonen, V. Zhukova, Y. Onuki, L. K. Li, K. Sumisawa, V. Bhardwaj, M. Iwasaki, B. G. Cheon, K. Nishimura, C.-L. Hsu, J. H. Yin, G. Schnell, Pavel Krokovny, S. Cunliffe, M. C. Chang, H. Hayashii, P. L. Wang, A. Ishikawa, Y. Seino, M. Nakao, C. Kiesling, G. Pakhlova, T. K. Pedlar, A. Sangal, T. Kuhr, P. Križan, T. Mori, Y. Usov, Y. Choi, B. Golob, K. Trabelsi, K. Lieret, V.M. Aulchenko, Z. S. Stottler, R. Itoh, V. Savinov, Rok Pestotnik, A. Rostomyan, M. Campajola, N. K. Nisar, Prafulla Kumar Behera, V. Popov, V. Gaur, K. Belous, Andrey Sokolov, Peter Kodys, W. W. Jacobs, J. S. Lange, T. D. Kimmel, S. K. Choi, M. Mrvar, Z. P. Zhang, T. Sumiyoshi, M. Bračko, M. Z. Wang, T. Podobnik, E. Solovieva, Jia-ju Zhang, A. B. Kaliyar, M. Hernandez Villanueva, K. Kinoshita, Y. Iwasaki, Martin Ritter, N. Dash, V. Babu, Y. J. Kwon, T. Sanuki, J. Schueler, N. Gabyshev, D. Červenkov, Shih-Chang Lee, N. Rout, Y. Sakai, Phillip Urquijo, G. Varner, X. P. Xu, P. Oskin, E. Prencipe, L. Cao, T. Ferber, M. Nayak, G. Karyan, B. G. Fulsom, James E. Fast, K. Senyo, Seokhee Park, Rocky Bala Garg, Samo Korpar, C. H. Kim, Y. B. Li, S. Al Said, Luka Santelj, V.N. Zhilich, Semen Eidelman, Sadaharu Uehara, L. Li Gioi, A. Garmash, Y. Kato, D. Ferlewicz, W. Sutcliffe, K. Chilikin, G. De Nardo, T. J. Moon, A. Chen, Soumen Paul, C. Beleño, H. Park, A. Bozek, K. Miyabayashi, M. Shapkin, Kohei Ogawa, S. Patra, Kiyoshi Tanida, E. Wang, M. Röhrken, G.V. Russo, K. Inami, R. Kulasiri, Yongsun Kim, Yoshinobu Unno, W. S. Hou, Z. Doležal, K. Lalwani, S. Uno, C. Schwanda, D. Cinabro, A. K. Giri, K. K. Joo, E. Won, V. Chekelian, M. Merola, G. B. Mohanty, M. Masuda, D. Matvienko, B.A. Shwartz, T. V. Dong, C. Z. Yuan, M. Starič, D. Liventsev, M. Takizawa, Vladimir Zhulanov, K.-H. Kim, R. Kroeger, I. S. Lee, P. Goldenzweig, V. Vorobyev, S. Jia, Y. Jin, O. Grzymkowska, C. H. Wang, H. Ye, T. Bilka, M. Watanabe, T. E. Browder, T. Matsuda, G. Bonvicini, J. Libby, D. M. Asner, K. Hayasaka, A. Vinokurova, J. G. Shiu, O. Hartbrich, S. H. Kim, Rakesh Kumar, M. T. Prim, Takeo Kawasaki, Shoichi Watanuki, D. Epifanov, S. Pardi, Seongbae Yang, G. Inguglia, Somnath Choudhury, J. Bennett, T. Uglov, A. Kuzmin, E.-J. Jang, S. Ogawa, F. Tenchini, R. Ayad, K. Cho, Seema Bahinipati, Iki Adachi, Doo Young Kim, H. Ono, R. Mizuk, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Belle, Collaboration, Campajola, M., De Nardo, G., Di Capua, F., Merola, M., Pardi, S., Russo, G., and Et, Al.

Subjects
+charmed+meson+K%2B%22">B+ --> charmed meson K+, Analytical chemistry, +charmed+meson+pi%2B+K0%28S%29%22">B+ --> charmed meson pi+ K0(S), annihilation [electron positron], 01 natural sciences, High Energy Physics - Experiment, e +e − experiments, Experiment, 10.57 GeV-cms, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics, [PHYS]Physics [physics], B0: hadronic decay, e+-e- Experiments, e, B+: branching ratio: upper limit, e +-e − Experiments, electron positron: colliding beams, Quarkonium, 3. Good health, +charmed+meson+K0%28S%29%22">B0 --> charmed meson K0(S), electroproduction [Upsilon(10570)], colliding beams [electron positron], radiative decay [charmed meson], quarkonium, Nuclear and High Energy Physics, spectroscopy, Upsilon(10570): electroproduction, Meson, +photon+h%2Fc%283526%29%22">charmed meson --> photon h/c(3526), BELLE, electron positron: annihilation, +, KEKB, KEK-B, 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, ddc:530, +charmed+meson+K%2B+pi%22">B0 --> charmed meson K+ pi, 010306 general physics, hadronic decay [B0], mesons, 010308 nuclear & particles physics, h/c(3526), branching ratio: upper limit [B+], B0: branching ratio: upper limit, −, Resonance, e(+)-e(-) experiments, charmed meson: radiative decay, B+: hadronic decay, lcsh:QC770-798, hadronic decay [B+], branching ratio: upper limit [B0], experimental results
Abstract

Journal of high energy physics 2020(5), 34 (2020). doi:10.1007/JHEP05(2020)034, The first dedicated search for the η$_{c2}$(1D) is carried out using the decays B$^{+}$→ η$_{c2}$(1D)K$^{+}$, B$^{0}$ → η$_{c2}$(1D)$ {K}_S^0 $, B$^{0}$→ η$_{c2}$(1D)π$^{−}$K$^{+}$, and B$^{+}$→ η$_{c2}$(1D)π$^{+} {K}_S^0 $ with η$_{c2}$(1D) → h$_{c}$γ. No significant signal is found. For the η$_{c2}$(1D) mass range between 3795 and 3845 MeV/c$^{2}$, the branching-fraction upper limits are determined to be ℬ(B$^{+}$→ η$_{c2}$(1D)K$^{+}$) × ℬ(η$_{c2}$(1D) → h$_{c}$γ) < 3.7 × 10$^{−5}$, ℬ(B$^{0}$→ η$_{c2}$(1D)K$^{0}$) × ℬ(η$_{c2}$(1D) → h$_{c}$γ) < 3.5 × 10$^{−5}$, ℬ(B$^{0}$→ η$_{c2}$(1D)π$^{−}$K$^{+}$) × ℬ(η$_{c2}$(1D) → h$_{c}$γ) < 1.0 × 10$^{−4}$, and ℬ(B$^{+}$→ η$_{c2}$(1D)π$^{+} {K}_S^0 $) × ℬ(η$_{c2}$(1D) → h$_{c}$γ) < 1.1 × 10$^{−4}$ at 90% C.L. The analysis is based on the 711 fb$^{−1}$ data sample collected on the ϒ(4S) resonance by the Belle detector, which operated at the KEKB asymmetric-energy e$^{+}$e$^{−}$ collider.[graphic not available: see fulltext], Published by SISSA, [Trieste]

Published
2020

93. Performance of PMTs for the JSNS2 experiment

Author

S. B. Kim, F. Suekane, Shoichi Hasegawa, Masahide Harada, Eunja Kim, K. K. Joo, Jeong-Sik Choi, Kenji Sakai, Eunhyang Kwon, Intae Yu, J. Y. Kim, T. Maruyama, I. Stancu, M. Y. Pac, M. Niiyama, M. Taira, Shinichi Sakamoto, S. J. M. Peeters, T. Nakano, A. Zohaib, J. H. Seo, W. Kim, C. D. Shin, Y. Hino, Kentaro Suzuya, P. Gwak, E. Marzec, Seyong Kim, M. Jang, D. E. Jung, Minfang Yeh, H. Jeon, Y. Kasugai, S. Jeon, Myung-Ki Cheoun, T. Dodo, J. S. Jang, I. T. Lim, H. Furuta, Tatsushi Shima, Masaharu Nomachi, T. Hiraiwa, Hyonsan Seo, J. S. Park, S. Ajimura, J. R. Jordan, H. Ray, S. Meigo, R. Ujiie, J. Spitz, Sin Kyu Kang, Tomoyuki Konno, D. H. Lee, Carsten Rott, M. Botran, K. Nishikawa, Dong Ho Moon, Takeo Kawasaki, Yorihito Sugaya, H. I. Jang, and S. Monjushiro

Subjects
Physics, Photomultiplier, Scintillation, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Scintillator, 01 natural sciences, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, Optics, Neutrino detector, 0103 physical sciences, Neutron source, Neutrino, Neutrino oscillation, business, Instrumentation, Mathematical Physics, Spallation Neutron Source
Abstract

The JSNS$^{2}$ (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) experiment aims to search for neutrino oscillations over a 24\,m short baseline at J-PARC. The JSNS$^{2}$ inner detector is filled with 17 tons of gadolinium-loaded liquid scintillator (LS) and both the intermediate $\gamma$-catcher and the optically separated outer veto are filled with un-loaded LS. Optical photons from scintillation are observed by 120 Photomultiplier Tubes (PMTs). A total of 130 PMTs for the JSNS2 experiment were both donated by other experiments and purchased from Hamamatsu. Donated PMTs were purchased around 10 years ago, therefore JSNS$^{2}$ did pre-calibration of the PMTs including the purchased PMTs. 123 PMTs demonstrated acceptable performance for the JSNS$^{2}$ experiment, and 120 PMTs were installed in the detector.

Published
2020
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94. Evidence of a structure in $$\bar{K}^{0} \Lambda _{c}^{+}$$ K¯0Λc+ consistent with a charged $$\Xi _c(2930)^{+}$$ Ξc(2930)+ , and updated measurement of $$\bar{B}^{0} \rightarrow \bar{K}^{0} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}$$ B¯0→K¯0Λc+Λ¯c- at Belle

Author

Y. B. Li, C. P. Shen, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, T. Aushev, R. Ayad, V. Babu, I. Badhrees, S. Bahinipati, Y. Ban, V. Bansal, P. Behera, C. Beleño, V. Bhardwaj, B. Bhuyan, J. Biswal, A. Bobrov, A. Bozek, M. Bračko, T. E. Browder, L. Cao, D. Červenkov, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, N. Dash, S. Di Carlo, J. Dingfelder, Z. Doležal, T. V. Dong, Z. Drásal, S. Eidelman, D. Epifanov, J. E. Fast, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, M. Gelb, A. Giri, P. Goldenzweig, B. Golob, J. Haba, K. Hayasaka, S. Hirose, W.-S. Hou, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, I. Jaegle, H. B. Jeon, S. Jia, Y. Jin, K. K. Joo, A. B. Kaliyar, K. H. Kang, Y. Kato, T. Kawasaki, D. Y. Kim, J. B. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, Y.-J. Kwon, J. S. Lange, I. S. Lee, S. C. Lee, L. K. Li, L. Li Gioi, J. Libby, D. Liventsev, T. Luo, D. Matvienko, M. Merola, H. Miyata, R. Mizuk, H. K. Moon, T. Mori, R. Mussa, E. Nakano, T. Nanut, K. J. Nath, Z. Natkaniec, M. Nayak, N. K. Nisar, S. Nishida, K. Nishimura, K. Ogawa, S. Okuno, H. Ono, P. Pakhlov, G. Pakhlova, B. Pal, S. Pardi, H. Park, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, V. Popov, E. Prencipe, A. Rostomyan, G. Russo, Y. Sakai, M. Salehi, S. Sandilya, L. Santelj, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, O. Seon, M. E. Sevior, T.-A. Shibata, J.-G. Shiu, E. Solovieva, M. Starič, J. F. Strube, M. Sumihama, T. Sumiyoshi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, Y. Unno, S. Uno, Y. Usov, C. Van Hulse, R. Van Tonder, G. Varner, K. E. Varvell, V. Vorobyev, E. Waheed, B. Wang, C. H. Wang, M.-Z. Wang, P. Wang, X. L. Wang, S. Watanuki, E. Widmann, E. Won, H. Ye, J. Yelton, J. H. Yin, C. Z. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, V. Zhukova, and V. Zhulanov

Subjects
lcsh:QB460-466, lcsh:QC770-798, High Energy Physics::Experiment, lcsh:Astrophysics, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Nuclear Experiment
Abstract

We report evidence for the charged charmed-strange baryon $$\Xi _{c}(2930)^+$$ Ξc(2930)+ with a signal significance of 3.9$$\sigma $$ σ with systematic errors included. The charged $$\Xi _{c}(2930)^+$$ Ξc(2930)+ is found in its decay to $$K_{S}^{0} \Lambda _{c}^+$$ KS0Λc+ in the substructure of $$\bar{B}^{0} \rightarrow K^{0}_{S} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}$$ B¯0→KS0Λc+Λ¯c- decays. The measured mass and width are $$[2942.3 \pm 4.4 ({\mathrm{stat.}}) \pm {1.5}({\mathrm{syst.}})]$$ [2942.3±4.4(stat.)±1.5(syst.)] MeV/$$c^{2}$$ c2 and $$[14.8 \pm 8.8({\mathrm{stat.}}) \pm {2.5}({\mathrm{syst.}})]$$ [14.8±8.8(stat.)±2.5(syst.)] MeV, respectively, and the product branching fraction is $$\mathcal{B}(\bar{B}^{0} \rightarrow \Xi _c(2930)^{+} \bar{\Lambda }_{c}^{-}) \mathcal{B}(\Xi _c(2930)^{+}\rightarrow \bar{K}^{0} \Lambda _{c}^{+})=[2.37 \pm 0.51 ({\mathrm{stat.}})\pm 0.31({\mathrm{syst.}})]\times 10^{-4}$$ B(B¯0→Ξc(2930)+Λ¯c-)B(Ξc(2930)+→K¯0Λc+)=[2.37±0.51(stat.)±0.31(syst.)]×10-4 . We also measure $$\mathcal{B}(\bar{B}^{0} \rightarrow \bar{K}^{0} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}) = [3.99 \pm 0.76({\mathrm{stat.}}) \pm 0.51({\mathrm{syst.}})] \times 10^{-4}$$ B(B¯0→K¯0Λc+Λ¯c-)=[3.99±0.76(stat.)±0.51(syst.)]×10-4 with greater precision than previous experiments, and present the results of a search for the charmonium-like state Y(4660) and its spin partner, $$Y_{\eta }$$ Yη , in the $$\Lambda _{c}^{+}\bar{\Lambda }_{c}^{-}$$ Λc+Λ¯c- invariant mass spectrum. No clear signals of the Y(4660) or $$Y_{\eta }$$ Yη are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of $$(772\pm 11)\times 10^{6} B\bar{B}$$ (772±11)×106BB¯ pairs collected at the $$\Upsilon (4S)$$ Υ(4S) resonance by the Belle detector at the KEKB asymmetric energy electron-positron collider.

Published
2018

95. Observation of a vector charmoniumlike state in e+e−→Ds+Ds1(2536)−+c.c

Author

D. Cinabro, G. Schnell, T. Iijima, Bumho Kim, Y. Choi, K. J. Nath, P. Chang, L. Santelj, T. Pang, S. Patra, P. Pakhlov, S. K. Choi, H. Hayashii, K. Tanida, A. M. Bakich, Y. Sakai, Rocky Bala Garg, N. Gabyshev, D. Červenkov, Samo Stanič, S. Nishida, Philip Lewis, Dipak Kumar Sahoo, T. Matsuda, S. Uno, A. Garmash, M. Nayak, H. Atmacan, K. Lieret, S. Pardi, W. S. Hou, H. Kichimi, G. Russo, H. Park, M. Takizawa, Victoria Zhukova, C. P. Shen, M. Bračko, A. Bozek, Y. Onuki, R. Mussa, A. Chen, G. Bonvicini, M. Uchida, Z. Doležal, V. Gaur, J. G. Shiu, Y. Iwasaki, A. Ishikawa, L. K. Li, Y. J. Kwon, V. Babu, K. Inami, E. Solovieva, V. Vorobyev, A. Vinokurova, O. Schneider, N. Rout, T. Bilka, Y. B. Li, V.M. Aulchenko, T. Ferber, R. Ayad, M. Watanabe, S. H. Kim, P. Krokovny, M. Z. Wang, K. Kinoshita, Soumen Paul, M. Röhrken, K. Chilikin, J. H. Yin, Vladimir Popov, B.A. Shwartz, G. S. Varner, J. Libby, D. M. Asner, K. Hayasaka, M. Iwasaki, Shih-Chang Lee, K. H. Kang, K. Cho, B. G. Cheon, Z. S. Stottler, B. Bhuyan, T. E. Browder, H. Ye, G. Pakhlova, S. Sandilya, D. Liventsev, Vladimir Zhulanov, C. H. Kim, Y. Jin, R. Itoh, B. Golob, K. Lalwani, R. Pestotnik, R. Kroeger, D. Epifanov, M. E. Sevior, I. S. Lee, P. Goldenzweig, C. Schwanda, A. Bobrov, M. Starič, A. Rostomyan, S. Korpar, Y. Seino, J. S. Lange, Andrey Sokolov, B. G. Fulsom, K. K. Joo, M. T. Prim, L. Li Gioi, F. Di Capua, D. Y. Kim, V. Savinov, T. K. Pedlar, W. Sutcliffe, K. Nishimura, D. Matvienko, S. Jia, R. Kulasiri, Seongbae Yang, James E. Fast, Seokhee Park, E. Won, V.N. Zhilich, C. H. Wang, I. Adachi, K. Miyabayashi, I. Badhrees, X. L. Wang, C. MacQueen, C. H. Li, R. Van Tonder, M. Campajola, G. Inguglia, H. Ono, R. Mizuk, H. Aihara, M. Niiyama, Y. Usov, Jyoti Prakash Biswal, C. Z. Yuan, E. Prencipe, F. Tenchini, T. Sumiyoshi, G. De Nardo, N. K. Nisar, Z. P. Zhang, S. Cunliffe, Yoshinobu Unno, L. E. Piilonen, P. Oskin, A. K. Giri, M. Masuda, T. V. Dong, L. Cao, C.-L. Hsu, K. Trabelsi, Peter Kodys, W. W. Jacobs, S. Di Carlo, G. Karyan, H. Miyata, Prafulla Kumar Behera, S.I. Eidelman, H. E. Cho, M. Merola, K. Senyo, T. Uglov, A. Kuzmin, and S. Ogawa

Subjects
Physics, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, 0103 physical sciences, Analytical chemistry, State (functional analysis), 010306 general physics, 01 natural sciences
Abstract

Using a data sample of 921.9 fb-1 collected with the Belle detector, we study the process of e+e-→Ds+Ds1(2536)-+c.c. via initial-state radiation. We report the first observation of a vector charmoniumlike state decaying to Ds+Ds1(2536)-+c.c. with a significance of 5.9σ, including systematic uncertainties. The measured mass and width are (4625.9-6.0+6.2(stat)±0.4(syst)) MeV/c2 and (49.8-11.5+13.9(stat)±4.0(syst)) MeV, respectively. The product of the e+e-→Ds+Ds1(2536)-+c.c. cross section and the branching fraction of Ds1(2536)-→D¯*0K- is measured from the DsD¯s1(2536) threshold to 5.59 GeV.

Published
2019

96. Measurements of the branching fractions B(B−→Λ¯c−Ξc′0) , B(B−→Λ¯c−Ξc(2645)0) and B(B−→Λ¯c−Ξc(2790)0)

Author

R. Mizuk, C. MacQueen, S. Pardi, S. Cunliffe, Andrey Sokolov, V. Babu, G. Schnell, T. Iijima, K. Nishimura, M. Z. Wang, K. Kinoshita, J. G. Shiu, Y. B. Li, M. Sumihama, T. Kuhr, F. Di Capua, H. Ono, M. Iwasaki, V. V. Zhulanov, J. E. Fast, T. Ferber, M. Campajola, Y. Sakai, B. G. Cheon, K. Lieret, S. Korpar, A. Garmash, S. Nishida, T. K. Pedlar, A. K. Giri, T. Bilka, S. K. Choi, Sudhanwa Patra, Shih-Chang Lee, Samo Stanič, X. L. Wang, L. E. Piilonen, M. Watanabe, M. Masuda, D. M. Asner, G. Pakhlova, P. Oskin, R. Kulasiri, M. Uchida, L. K. Li, Y. Iwasaki, E. Won, R. Mussa, Y. J. Kwon, E. Solovieva, H. Hayashii, M. Röhrken, K. Chilikin, C. H. Kim, H. Atmacan, R. Van Tonder, D. Liventsev, K. Tanida, K. Trabelsi, Z. S. Stottler, J. Libby, O. Schneider, N. Rout, P. K. Behera, A. Ishikawa, T. Matsuda, Y. Unno, B. Shwartz, R. B. Garg, L. Cao, A. Kuzmin, B. G. Fulsom, T. E. Browder, C. P. Shen, K. Lalwani, G. S. Varner, Seok Kim, S. Uno, Seongbae Yang, M. Niiyama, J. H. Yin, C. Schwanda, S. Ogawa, S. Jia, W. Sutcliffe, Y. Onuki, C.-L. Hsu, I. Adachi, R. Pestotnik, H. Kichimi, G. Bonvicini, M. Bračko, Vladimir Popov, A. Vinokurova, R. Itoh, A. Rostomyan, Y. Seino, V.N. Zhilich, B. Golob, C. Z. Yuan, V. M. Aulchenko, C. H. Wang, K. Inami, V. Savinov, Peter Kodys, W. W. Jacobs, N. K. Nisar, F. Tenchini, J. S. Lange, D. Ferlewicz, S. Eidelman, T. Podobnik, T. Sumiyoshi, C. H. Li, P. Goldenzweig, P. Krokovny, D. Matvienko, S. Sandilya, K. K. Joo, M. T. Prim, D. Y. Kim, S. Paul, L. Li Gioi, T. Pang, A. M. Bakich, Yang Li, E. Prencipe, H. Ye, P. Pakhlov, T. V. Dong, Victoria Zhukova, S. Di Carlo, Y. Choi, G.V. Russo, Philip Lewis, T. Uglov, K. H. Kang, K. Cho, M. Starič, Seokhee Park, G. Karyan, M. Nayak, K. J. Nath, I. Badhrees, W. S. Hou, D. Cinabro, R. Kroeger, M. E. Sevior, I. S. Lee, T. Hara, L. Santelj, G. Inguglia, N. Gabyshev, D. Červenkov, M. Takizawa, A. Chen, H. Park, A. Bozek, H. Miyata, M. Merola, Ya-Qiu Jin, John Yelton, P. Chang, Z. Doležal, R. Ayad, G. De Nardo, K. Senyo, K. Hayasaka, A. Bobrov, H. E. Cho, B. Grube, H. Aihara, Jyoti Prakash Biswal, V. Gaur, Deepak Kumar Sahoo, M. Nakao, and Z. P. Zhang

Subjects
Physics, 010308 nuclear & particles physics, Branching fraction, Analytical chemistry, Lambda, Branching (polymer chemistry), 01 natural sciences, Baryon, KEKB, Recoil, 0103 physical sciences, Mass spectrum, 010306 general physics, Bar (unit)
Abstract

Using the data sample of 711 fb-1 of ϒ(4S) on-resonance data taken by the Belle detector at the KEKB asymmetric-energy electron-positron collider, we present the first measurements of branching fractions of the decays B-→Λ¯c-Ξc′0, B-→Λ¯c-Ξc(2645)0, and B-→Λ¯c-Ξc(2790)0. The signal yields for these decays are extracted from the recoil mass spectrum of the system recoiling against Λ¯c- baryons in selected B- candidates. The branching fraction of B-→Λ¯c-Ξc(2790)0 is measured to be (1.1±0.4±0.2)×10-3, where the first uncertainty is statistical and the second is systematic. The 90% credibility level upper limits on B(B-→Λ¯c-Ξc′0) and B(B-→Λ¯c-Ξc(2645)0) are determined to be 6.5×10-4 and 7.9×10-4, respectively.

Published
2019

97. Semi-inclusive π0 target and beam-target asymmetries from 6 GeV electron scattering with CLAS

Author

P. Lenisa, W. Kim, R. Dupre, M. Battaglieri, G. Niculescu, G. Rosner, K. Livingston, M. Hattawy, Friedrich Klein, Y. Ghandilyan, A. Filippi, X. Wei, Brian Raue, M. Khandaker, M. J. Amaryan, V. I. Mokeev, D. Heddle, K. L. Giovanetti, Larry Weinstein, G. Hollis, R. A. Schumacher, Jie Zhang, K. A. Griffioen, Dustin Keller, C. Hanretty, N. Guler, G. Khachatryan, A. Celentano, R. W. Gothe, D. P. Watts, P. Nadel-Turonski, Michael Wood, Taya Chetry, W. J. Briscoe, H. Egiyan, M. Ungaro, Laura Clark, L. Lanza, S. Bültmann, M. E. McCracken, Sergey Kuleshov, K. P. Adhikari, T. A. Forest, C. Carlin, H. Avakian, F. X. Girod, S. Pisano, B. S. Ishkhanov, Sylvester Joosten, P. Eugenio, F. Cao, P. Bosted, P. Rossi, S. Strauch, D. Adikaram, E. De Sanctis, M. Guidal, M. Taiuti, J. Brock, C. Munoz Camacho, K. Joo, H. Hakobyan, D. Protopopescu, G. D. Smith, M. Holtrop, W. Phelps, V. Crede, C. Salgado, D. I. Sober, M. Garçon, J. Pierce, E. Voutier, S. Adhikari, B. McKinnon, Avraham Klein, R. A. Montgomery, C. Djalali, H. Voskanyan, Maxime Defurne, I. Bedlinskiy, L. Colaneri, O. Cortes, M. Mirazita, E. Phelps, H. Y. Lu, E. L. Isupov, E. Pasyuk, V. Batourine, R. De Vita, A. El Alaoui, S. Boiarinov, Nicholas Zachariou, A. D'Angelo, R. Paremuzyan, S. Anefalos Pereira, Nicholas M. Harrison, Gerard Gilfoyle, A. Kim, D. Sokhan, N. Markov, N. A. Baltzell, L. El Fassi, J. W. Price, I. Niculescu, V. P. Kubarovsky, Z. W. Zhao, K. Hicks, D. Riser, C. D. Keith, A. I. Ostrovidov, L. Guo, Alessandro Rizzo, O. Pogorelko, S. M. Hughes, K. Park, G. Ddoge, D. G. Ireland, I. Stankovic, T. Mineeva, H. Jiang, R. G. Fersch, Volker D. Burkert, A. S. Biselli, William Brooks, P. L. Cole, S. Koirala, A. Fradi, M. Osipenko, M. Contalbrigo, D. G. Jenkins, Iu. Skorodumina, Z. Akbar, G. Charles, A. Simonyan, F. Sabatié, N. K. Walford, S. S. Jawalkar, I. J. D. MacGregor, W. Gohn, E. Golovatch, A. Deur, L. A. Net, Latifa Elouadrhiri, C. A. Meyer, Y. G. Sharabian, G. V. Fedotov, N. Dashyan, S. E. Kuhn, Yordanka Ilieva, J. A. Fleming, Martin K. Mayer, M. Khachatryan, S. Fegan, C. Gleason, G. Ciullo, J. P. Ball, Y. Prok, D. S. Carman, Nikos Sparveris, S. Niccolai, A. Movsisyan, M. Ripani, E. Seder, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CLAS, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Single spin asymmetries, Hadron, fragmentation function, 01 natural sciences, Settore FIS/04 - Fisica Nucleare e Subnucleare, transverse momentum: momentum spectrum, Collins, hadron: production, Nuclear Experiment, Spin-½, Physics, deep inelastic scattering: semi-inclusive reaction, suppression, Collins fragmentation, hadron: energy, lcsh:QC1-999, Double spin asymmetries, Semi-inclusive deep-inelastic scattering, Transverse momentum distributions, High Energy Physics - Phenomenology, transverse, electron: scattering, cryogenics, spin: asymmetry, Jefferson Lab, Nuclear and High Energy Physics, pi: momentum, Quark, Socio-culturale, quark gluon: correlation, lepton: scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], quark, pi: electroproduction, Nuclear physics, Pion, target: spin, deep inelastic scattering, CLAS, 0103 physical sciences, 010306 general physics, 010308 nuclear & particles physics, Scattering, High Energy Physics::Phenomenology, Deep inelastic scattering, Gluon, Automatic Keywords, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, higher-dimensional, lcsh:Physics, experimental results, Lepton
Abstract

We present precision measurements of the target and beam-target spin asymmetries from neutral pion electroproduction in deep-inelastic scattering (DIS) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. We scattered 6-GeV, longitudinally polarized electrons off longitudinally polarized protons in a cryogenic $^{14}$NH$_3$ target, and extracted double and single target spin asymmetries for $ep\rightarrow e^\prime\pi^0X$ in multidimensional bins in four-momentum transfer ($1.0, Comment: 18 preprint pages, 3 figures

Published
2018

98. Observation of $$\Xi _{c}(2930)^0$$ Ξc(2930)0 and updated measurement of $$B^{-} \rightarrow K^{-} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}$$ B-→K-Λc+Λ¯c- at Belle

Author

Y. B. Li, C. P. Shen, I. Adachi, J. K. Ahn, H. Aihara, S. Al Said, D. M. Asner, T. Aushev, R. Ayad, V. Babu, I. Badhrees, A. M. Bakich, Y. Ban, V. Bansal, P. Behera, M. Berger, V. Bhardwaj, B. Bhuyan, J. Biswal, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S.-K. Choi, Y. Choi, D. Cinabro, S. Cunliffe, N. Dash, S. Di Carlo, Z. Doležal, Z. Drásal, S. Eidelman, D. Epifanov, J. E. Fast, T. Ferber, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, M. Gelb, A. Giri, P. Goldenzweig, E. Guido, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, M. T. Hedges, W.-S. Hou, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, S. Jia, Y. Jin, K. K. Joo, T. Julius, G. Karyan, Y. Kato, T. Kawasaki, H. Kichimi, C. Kiesling, D. Y. Kim, J. B. Kim, K. T. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, R. Kulasiri, T. Kumita, A. Kuzmin, Y.-J. Kwon, I. S. Lee, S. C. Lee, L. K. Li, L. Li Gioi, J. Libby, D. Liventsev, M. Lubej, T. Luo, J. MacNaughton, M. Masuda, T. Matsuda, M. Merola, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, H. K. Moon, T. Mori, M. Mrvar, R. Mussa, E. Nakano, M. Nakao, T. Nanut, K. J. Nath, Z. Natkaniec, M. Nayak, M. Niiyama, S. Nishida, S. Ogawa, P. Pakhlov, G. Pakhlova, B. Pal, S. Pardi, C. W. Park, H. Park, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, V. Popov, A. Rostomyan, G. Russo, Y. Sakai, M. Salehi, S. Sandilya, L. Santelj, T. Sanuki, O. Schneider, G. Schnell, C. Schwanda, Y. Seino, V. Shebalin, T.-A. Shibata, J.-G. Shiu, B. Shwartz, A. Sokolov, E. Solovieva, M. Starič, J. F. Strube, M. Sumihama, T. Sumiyoshi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, Y. Unno, S. Uno, C. Van Hulse, G. Varner, V. Vorobyev, A. Vossen, E. Waheed, B. Wang, C. H. Wang, M.-Z. Wang, P. Wang, X. L. Wang, M. Watanabe, Y. Watanabe, E. Widmann, E. Won, H. Ye, J. Yelton, C. Z. Yuan, Y. Yusa, S. Zakharov, Z. P. Zhang, V. Zhilich, V. Zhukova, and V. Zhulanov

Subjects
lcsh:QB460-466, lcsh:QC770-798, High Energy Physics::Experiment, lcsh:Astrophysics, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Nuclear Experiment
Abstract

We report the first observation of the $$\Xi _{c}(2930)^0$$ Ξc(2930)0 charmed-strange baryon with a significance greater than 5$$\sigma $$ σ . The $$\Xi _{c}(2930)^0$$ Ξc(2930)0 is found in its decay to $$K^- \Lambda _{c}^+$$ K-Λc+ in $$B^{-} \rightarrow K^{-} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}$$ B-→K-Λc+Λ¯c- decays. The measured mass and width are $$[2928.9 \pm 3.0(\mathrm stat.)^{+0.9}_{-12.0}(\mathrm syst.)]$$ [2928.9±3.0(stat.)-12.0+0.9(syst.)] MeV/$$c^{2}$$ c2 and $$[19.5 \pm 8.4(\mathrm stat.) ^{+5.9}_{-7.9}(\mathrm syst.)]$$ [19.5±8.4(stat.)-7.9+5.9(syst.)] MeV, respectively, and the product branching fraction is $$\mathcal{B}(B^{-} \rightarrow \Xi _{c}(2930)^0 \bar{\Lambda }_{c}^{-}) \mathcal{B}(\Xi _{c}(2930)^0 \rightarrow K^- \Lambda _{c}^{+})=[1.73 \pm 0.45(\mathrm stat.) \pm 0.21(\mathrm syst.)]\times 10^{-4}$$ B(B-→Ξc(2930)0Λ¯c-)B(Ξc(2930)0→K-Λc+)=[1.73±0.45(stat.)±0.21(syst.)]×10-4 . We also measure $$\mathcal{B}(B^{-} \rightarrow K^{-} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}) = [4.80 \pm 0.43(\mathrm stat.) \pm 0.60(\mathrm syst.)] \times 10^{-4}$$ B(B-→K-Λc+Λ¯c-)=[4.80±0.43(stat.)±0.60(syst.)]×10-4 with improved precision, and search for the charmonium-like state Y(4660) and its spin partner, $$Y_{\eta }$$ Yη , in the $$\Lambda _{c}^{+}\bar{\Lambda }_{c}^{-}$$ Λc+Λ¯c- invariant mass spectrum. No clear signals of the Y(4660) nor its spin partner are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of $$(772\pm 11)\times 10^{6} B\bar{B}$$ (772±11)×106BB¯ pairs collected at the $$\Upsilon (4S)$$ Υ(4S) resonance by the Belle detector at the KEKB asymmetric energy electron–positron collider.

Published
2018

99. Development of the readout system for the K2K SciBar detector

Author

Yoshida, M., Yamamoto, S., Murakami, T., Tanaka, M., Nakaya, T., Nishikawa, K. Joo, K.K., Kim, B.J., Kim, J.Y., Kim, S.B., Lee, M.J., and Lim, I.T.

Subjects
Nuclear physics -- Research, Detectors -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Readout electronics for the scintillation bar tracking detector (SciBar) in the K2K neutrino oscillation experiment has been developed. SciBar has 14 336 scintillator bars in total. The deposited energy and timing of particles from neutrino interactions in the scintillator bars are measured by 64-channel multianode photo-multiplier tubes (MAPMTs). Compact custom-designed electronics to record the MAPMT signals were developed, consisting of front-end circuit boards attached to each MAPMT and back-end electronics modules sitting in a VME crate. The front-end circuit board multiplexes pulse-height information from all 64 anodes and generates a fast triggering signal. Two sets of ASICs (IDEAS VA32HDRII and TA32CG) are employed for these functions. The bias voltages and relay of control signals are also handled on the board. The back-end electronics module controls the front-end board by providing the control, timing, and low-voltage signals. The board also digitizes the multiplexed signal from the front-end. The electronics achieves low noise of less than 0.3 photo-electrons and good linearity up to 300 (150) photo-electrons for MAPMTs at the gain of 5 + [10.sup.5] ([10.sup.6]). Index Terms--K2K, neutrino, photomultiplier, SciBar, scintillation detector.

Published
2004

100. 12C(e,e'pN) measurements of short range correlations in the tensor-to-scalar interaction transition region

Author

M. J. Amaryan, P. Lenisa, Jie Zhang, A. Beck, L. Marsicano, T. B. Hayward, U. Shrestha, Larry Weinstein, S. Strauch, Maxime Defurne, K. A. Griffioen, D. P. Watts, Friedrich Klein, R. Paremuzyan, Brian Raue, O. Pogorelko, J. Rowley, A. I. Ostrovidov, R. A. Schumacher, F. X. Girod, M. Duer, A. Denniston, E. Golovatch, R. Dupre, Nicholas M. Harrison, R. De Vita, I. I. Strakovsky, P. Eugenio, A. Deur, W. K. Brooks, A. Filippi, D. Sokhan, B. A. Clary, D. Protopopescu, Volker D. Burkert, A. S. Biselli, L. Lanza, M. Khandaker, N. Tyler, C. Djalali, E. Voutier, Michael Paolone, Y. G. Sharabian, X. Zheng, H. Atac, J. A. Tan, Y. Prok, D. S. Carman, I. Bedlinskiy, W. Phelps, V. Lucherini, M. Battaglieri, A. El Alaoui, Y. Ilieva, E. L. Isupov, Nicholas Zachariou, X. Wei, S. Mey-Tal Beck, S. Boiarinov, Hovanes Egiyan, F. Hauenstein, C. Munoz Camacho, J. W. Price, Taofeng Wang, Fatiha Benmokhtar, M. Khachatryan, Nikolaos Sparveris, N. Markov, A. Movsisyan, R. Cruz-Torres, T. A. Forest, O. Soto, D. Heddle, M. Ungaro, K. P. Adhikari, Douglas Higinbotham, Latifa Elouadrhiri, D. Marchand, P. Nadel-Turonski, S. Adhikari, B. McKinnon, M. Ripani, A. Kim, S. Stepanyan, I. Korover, M. Hattawy, M. Guidal, B. Mustapha, Z. W. Zhao, T. Mineeva, Or Hen, H. Hakobyan, M. Mirazita, J. Ritman, L. Barion, J.R. Pybus, M. Holtrop, S. Diehl, R. G. Fersch, C. Salgado, K. Joo, Luciano Pappalardo, T. Chetry, E.P. Segarra, H. S. Jo, D. G. Jenkins, M. Leali, Eugene Pasyuk, P. L. Cole, M. Ehrhart, G. Rosner, P. Chatagnon, A. D'Angelo, L. El Fassi, V. P. Kubarovsky, L. Venturelli, Krishna Neupane, C. W. Kim, H. Voskanyan, W. J. Briscoe, Dustin Keller, E. Piasetzky, D. Bulumulla, Michael Wood, K. Hafidi, Aditya R. Khanal, Andrea Bianconi, G. Niculescu, Alexander Schmidt, G. Gavalian, M. Osipenko, I. J. D. MacGregor, F. Sabatié, D. G. Ireland, V. Crede, M. Contalbrigo, Laura Clark, G. Angelini, K. Hicks, A. Celentano, R. W. Gothe, Alessandro Rizzo, V. Mascagna, S. Joosten, K. Livingston, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and The Clas Collaboration

Subjects
Nuclear and High Energy Physics, Nuclear Theory, dependence, CLAS, dynamics, isospin, energy, system, Astronomy & Astrophysics, Physics, QC1-999, Scalar (mathematics), FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Astrophysics, 01 natural sciences, Nuclear Theory (nucl-th), Momentum, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, ddc:530, Tensor, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Nuclear theory, [PHYS]Physics [physics], Range (particle radiation), 010308 nuclear & particles physics, Settore FIS/04, Nuclear interaction, High Energy Physics - Phenomenology, Astronomy &amp, Atomic physics, Nucleon
Abstract

High-momentum configurations of nucleon pairs at short-distance are probed using measurements of the $^{12}$C$(e,e'p)$ and $^{12}$C$(e,e'pN)$ reactions (where $N$ is either $n$ or $p$), at high-$Q^2$ and $x_B>1.1$. The data span a missing-momentum range of 300--1000 MeV/c and are predominantly sensitive to the transition region of the strong nuclear interaction from a Tensor to Scalar interaction. The data are well reproduced by theoretical calculations using the Generalized Contact Formalism with both chiral and phenomenological nucleon-nucleon ($NN$) interaction models. This agreement suggests that the measured high missing-momentum protons up to $1000$ MeV/c predominantly belong to short-ranged correlated (SRC) pairs. The measured $^{12}$C$(e,e'pN)$ / $^{12}$C$(e,e'p)$ and $^{12}$C$(e,e'pp)$ / $^{12}$C$(e,e'pn)$ cross-section ratios are consistent with a decrease in the fraction of proton-neutron SRC pairs and increase in the fraction of proton-proton SRC pairs with increasing missing momentum. This confirms the transition from an isospin-dependent tensor $NN$ interaction at $\sim 400$ MeV/c to an isospin-independent scalar interaction at high-momentum around $\sim 800$ MeV/c as predicted by theoretical calculation., Accepted for publication in Physics Letters B. 7 pages, 3 figures, and online supplementary materials

Published
2021

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