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1. Measurements of isospin asymmetry and difference of direct $CP$ asymmetries in inclusive $B \to X_s \gamma$ decays

Author

Watanuki, S., Ishikawa, A., Bakich, A. M., Mohanty, G. B., Mori, T., Nakao, M., Nanut, T., Nath, K. J., Niiyama, M., Nishida, S., Nishimura, K., Ogawa, K., Ogawa, S., Bansal, V., Okuno, S., Ono, H., Ostrowicz, W., Pakhlov, P., Pakhlova, G., Pal, B., Park, H., Paul, S., Pedlar, T. K., Pestotnik, R., Behera, P., Piilonen, L. E., Prencipe, E., Ritter, M., Rostomyan, A., Russo, G., Sakai, Y., Sandilya, S., Santelj, L., Savinov, V., Schneider, O., Beleño, C., Schnell, G., Schueler, J., Schwanda, C., Schwartz, A. J., Seino, Y., Senyo, K., Seon, O., Shebalin, V., Shibata, T.-A., Shiu, J.-G., Berger, M., Shwartz, B., Sokolov, A., Solovieva, E., Stanič, S., Starič, M., Sumiyoshi, T., Sutcliffe, W., Takizawa, M., Tanida, K., Taniguchi, N., Bhardwaj, V., Tenchini, F., Uchida, M., Uglov, T., Unno, Y., Uno, S., Vahsen, S. E., Van Hulse, C., Van Tonder, R., Varner, G., Varvell, K. E., Bhuyan, B., Vossen, A., Wang, B., Wang, C. H., Wang, M.-Z., Wang, P., Watanabe, M., Widmann, E., Won, E., Ye, H., Yin, J. H., Bilka, T., Yusa, Y., Zakharov, S., Zhang, Z. P., Zhilich, V., Zhukova, V., Zhulanov, V., Zupanc, A., Belle Collaboration, Biswal, J., Bobrov, A., Adachi, I., Bonvicini, G., Bozek, A., Brač, M., Browder, T. E., Cao, L., Červenkov, D., Chang, P., Cheon, B. G., Chilikin, K., Cho, K., Aihara, H., Choi, Y., Choudhury, S., Cinabro, D., Cunliffe, S., Di Carlo, S., Dingfelder, J., Dong, T. V., Eidelman, S., Epifanov, D., Fast, J. E., Al Said, S., Ferber, T., Frey, A., Fulsom, B. G., Gaur, V., Gabyshev, N., Garmash, A., Gelb, M., Giri, A., Goldenzweig, P., Guan, Y., Asner, D. M., Guido, E., Haba, J., Hayasaka, K., Hayashii, H., Hou, W.-S., Iijima, T., Inami, K., Inguglia, G., Itoh, R., Iwasaki, M., Aushev, T., Iwasaki, Y., Jacobs, W. W., Jaegle, I., Jeon, H. B., Jia, S., Jin, Y., Joo, K. K., Julius, T., Karyan, G., Kawasaki, T., Ayad, R., Kiesling, C., Kim, D. Y., Kim, J. B., Kim, S. H., Kinoshita, K., Kodyš, P., Korpar, S., Kotchetkov, D., Križ, P., Kroeger, R., Babu, V., Krokovny, P., Kuhr, T., Kumar, R., Kuzmin, A., Kwon, Y.-J., Lee, I. S., Lee, S. C., Li, L. K., Li, Y. B., Li Gioi, L., Badhrees, I., Libby, J., Liventsev, D., Lubej, M., Luo, T., Masuda, M., Matsuda, T., Merola, M., Miyabayashi, K., Miyata, H., Mizuk, R., Laboratoire de l'Accélérateur Linéaire (LAL), 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), Belle, 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
Upsilon(10570): electroproduction, isospin: asymmetry, BELLE, B: radiative decay, annihilation [electron positron], S042A12, electron positron: annihilation, S049A06, CP [asymmetry], 10.58 GeV-cms, violation [CP], High Energy Physics - Experiment, KEK-B, CP: violation, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Particle Physics Experiments, ddc:530, photon: resolved, radiative decay [B], Seoul 2018/07/04 [talk], B: pair production, talk: Seoul 2018/07/04, resolved [photon], electron positron: colliding beams, S049CP2, S041A11, pair production [B], asymmetry: CP, High Energy Physics - Phenomenology, Upsilon(10570), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], electroproduction [Upsilon(10570)], colliding beams [electron positron], S049IA1, branching ratio, asymmetry [isospin], S049DA1, experimental results
Abstract

We report measurements of isospin asymmetry $\Delta_{0-}$ and difference of direct $CP$ asymmetries $\Delta A_{CP}$ between charged and neutral $B \to X_s \gamma$ decays. This analysis is based on the data sample containing $772 \times 10^6 B\bar{B}$ pairs that was collected with the Belle detector at the KEKB energy-asymmetric $e^+ e^-$ collider. Using a sum-of-exclusive technique with invariant $X_s$ mass up to 2.8~GeV/$c^2$, we obtain $\Delta_{0-} = \bigl[-0.48 \pm 1.49 {\rm (stat.)} \pm 0.97 {\rm (syst.)} \pm 1.15 {(f_{+-}/f_{00})}\bigr]$\% and $\Delta A_{CP} = \bigl[+3.69 \pm 2.65 {\rm (stat.)} \pm 0.76{\rm (syst.)}\bigr]$\%, where the last uncertainty for $\Delta_{0-}$ is due to the uncertainty on the production ratio of $B^+B^-$ to $B^0\bar{B}^0$ in $\Upsilon(4S)$ decays. The measured value of $\Delta_{0-}$ is consistent with zero, allowing us to constrain the resolved photon contribution in the $B \to X_s \gamma$, and improve the branching fraction prediction. The result for $\Delta A_{CP}$ is consistent with the prediction of the SM. We also measure the direct $CP$ asymmetries for charged and neutral $B \to X_s \gamma$ decays. All the measurements are the most precise to date., Comment: 20 pages, 10 figures, submitted to PRD

Published
2019
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2. Diffractive photoproduction of dijets in ep collisions at HERA

Author

Chekanov, S[ 1 ], Derrick, M[ 1 ], Magill, S[ 1 ], Musgrave, B[ 1 ], Nicholass, D[ 1 ], Repond, J[ 1 ], Yoshida, R[ 1 ], Mattingly, MCK[ 2 ], Jechow, M[ 3 ], Pavel, N[ 3 ], Molina, AGY[ 3 ], Antonelli, S[, 4, 59, ], Antonioli, P[, 4, Bari, G[, 4, Basile, M[, 4, Bellagamba, L[, 4, Bindi, Boscherini, D[, 4, Bruni, A[, 4, Cifarelli, Cindolo, F[, 4, Contin, Corradi, DE PASQUALE, Salvatore, Iacobucci, Margotti, Nania, R[, 4, Polini, Sartorelli, Zichichi, Bartsch, D[ 60 ], Brock, I[ 60 ], Hartmann, H[ 60 ], Hilger, E[ 60 ], Jakob, HP[ 60 ], Jungst, M[ 60 ], Kind, OM[ 60 ], Nuncio Quiroz, AE[ 60 ], Paul, E[ 60 ], Renner, R[ 60 ], Samson, U[ 60 ], Schonberg, V[ 60 ], Shehzadi, R[ 60 ], Wlasenko, M[ 60 ], Brook, NH[ 61 ], Heath, GP[ 61 ], Morris, JD[ 61 ], Capua, M[, 62, 63, ], Fazio, S[, 62, Mastroberardino, A[, 62, Schioppa, Susinno, G[, 62, Tassi, E[, 62, Kim, JY[ 5 ], Ibrahim, ZA[ 6 ], Kamaluddin, B[ 6 ], Abdullah, WATW[ 6 ], Ning, Y[ 7 ], Ren, Z[ 7 ], Sciulli, F[ 7 ], Chwastowski, J[ 8 ], Eskreys, A[ 8 ], Figiel, J[ 8 ], Galas, A[ 8 ], Gil, M[ 8 ], Olkiewicz, K[ 8 ], Stopa, P[ 8 ], Zawiejski, L[ 8 ], Adamczyk, L[ 9 ], Bold, T[ 9 ], Grabowska Bold, I[ 9 ], Kisielewska, D[ 9 ], Lukasik, J[ 9 ], Przybycien, M[ 9 ], Suszycki, L[ 9 ], Kotanski, A[ 10 ], Slominski, W[ 10 ], Adler, V[ 11 ], Behrens, U, Blohm, C, Bonato, A, Borras, K, Ciesielski, R, Coppola, N, Drugakov, V, Fang, S, Fourletova, J[ 11 ], Geiser, A[ 11 ], Gladkov, D[ 11 ], Gottlicher, P[ 11 ], Grebenyuk, J[ 11 ], Gregor, I[ 11 ], Haas, T[ 11 ], Hain, W[ 11 ], Huttmann, A[ 11 ], Kahle, B[ 11 ], Katkov, II[ 11 ], Klein, U[ 11 ], Kotz, U[ 11 ], Kowalski, H[ 11 ], Lobodzinska, E[ 11 ], Lohr, B[ 11 ], Mankel, R[ 11 ], Melzer Pellmann, IA[ 11 ], Miglioranzi, S[ 11 ], Montanari, A[ 11 ], Namsoo, T[ 11 ], Notz, D[ 11 ], Rinaldi, L[ 11 ], Roloff, P[ 11 ], Rubinsky, I[ 11 ], Santamarta, R[ 11 ], Schneekloth, U[ 11 ], Spiridonov, A[, 11, 55, ], Szuba, D[, 11, 56, ], Szuba, J[ 11 ], Theedt, T[ 11 ], Wolf, G[ 11 ], Wrona, K[ 11 ], Youngman, C[ 11 ], Zeuner, W[ 11 ], Lohmann, W[ 12 ], Schlenstedt, S[ 12 ], Barbagli, G[, 13, 14, ], Gallo, E[, 13, Pelfer, Pg[, 13, Bamberger, A[ 15 ], Dobur, D[ 15 ], Karstens, F[ 15 ], Vlasov, NN[ 15 ], Bussey, Pj[, 15, 16, ], Doyle, AT[ 16 ], Dunne, W[ 16 ], Forrest, M[ 16 ], Saxon, DH[ 16 ], Skillicorn, IO[ 16 ], Gialas, I[ 17 ], Papageorgiu, K[ 17 ], Holm, U[ 18 ], Klanner, R[ 18 ], Lohrmann, E[ 18 ], Schleper, P[ 18 ], Schorner Sadenius, T[ 18 ], Sztuk, J[ 18 ], Stadie, H[ 18 ], Turcato, M[, 18, 35, ], Foudas, C[ 19 ], Fry, C[ 19 ], Long, KR[ 19 ], Tapper, AD[ 19 ], Matsumoto, T[ 20 ], Nagano, K[ 20 ], Tokushuku, K[ 20 ], Yamada, S[ 20 ], Yamazaki, Y[ 20 ], Barakbaev, An[, 20, 65, ], Boos, Eg[, 20, Pokrovskiy, NS[ 65 ], Zhautykov, BO[ 65 ], Aushev, V[, 21, 22, ], Borodin, M[, 21, Kozulia, A[, 21, Lisovyi, Son, D[ 64 ], de Favereau, J[ 23 ], Piotrzkowski, K[ 23 ], Barreiro, F[ 24 ], Glasman, C[ 24 ], Jimenez, M[ 24 ], Labarga, L[ 24 ], del Peso, J[ 24 ], Ron, E[ 24 ], Soares, M[ 24 ], Terron, J[ 24 ], Zambrana, M[ 24 ], Corriveau, F[ 25 ], Liu, C[ 25 ], Walsh, R[ 25 ], Zhou, C[ 25 ], Tsurugai, T[ 26 ], Antonov, A[ 27 ], Dolgoshein, BA[ 27 ], Sosnovtsev, V[ 27 ], Stifutkin, A[ 27 ], Suchkov, S[ 27 ], Dementiev, RK[ 28 ], Ermolov, PF[ 28 ], Gladilin, LK[ 28 ], Khein, LA[ 28 ], Korzhavina, IA[ 28 ], Kuzmin, VA[ 28 ], Levchenko, BB[ 28 ], Lukina, OY[ 28 ], Proskuryakov, AS[ 28 ], Shcheglova, LM[ 28 ], Zotkin, DS[ 28 ], Zotkin, SA[ 28 ], Abt, I[ 29 ], Buttner, C[ 29 ], Caldwell, A[ 29 ], Kollar, D[ 29 ], Schmidke, WB[ 29 ], Sutiak, J[ 29 ], Grigorescu, G[, 29, 31, ], Keramidas, A[, 30, Koffeman, E[, 30, Kooijman, P[, 30, Pellegrino, Tiecke, H[, 30, Vazquez, M[, 30, Wiggers, L[, 30, Brummer, N[ 32 ], Bylsma, B[ 32 ], Durkin, LS[ 32 ], Lee, A[ 32 ], Ling, TY[ 32 ], Allfrey, PD[ 33 ], Bell, MA[ 33 ], Cooper Sarkar, AM[ 33 ], Devenish, RCE[ 33 ], Ferrando, J[ 33 ], Foster, B[ 33 ], Korcsak Gorzo, K[ 33 ], Oliver, K[ 33 ], Patel, S[ 33 ], Roberfroid, V[ 33 ], Robertson, A[ 33 ], Straub, PB[ 33 ], Uribe, Estrada, C[, 9, 33, ], Walczak, R[ 33 ], Bellan, P[, 34, Bertolin, A[, 34, Brugnera, R[, 34, Carlin, Dal, Corso, F[, 34, Dusini, S[, 34, Garfagnini, Limentani, Longhin, Stanco, L[, 34, Turcato, M, BY[ 36 ], Oh, Raval, A[ 36 ], Ukleja, J[ 36 ], Whitmore, JJ[ 36 ], Iga, Y[ 37 ], D'Agostini, G[, 38, 39, ], Marini, Nigro, A[, 38, Cole, JE[ 40 ], Hart, JC[ 40 ], Abramowicz, H[ 41 ], Gabareen, A[ 41 ], Ingbir, R[ 41 ], Kananov, S[ 41 ], Levy, A[ 41 ], Smith, O[ 41 ], Stern, A[ 41 ], Kuze, M[ 42 ], Maeda, J[ 42 ], Hori, R[ 43 ], Kagawa, S[ 43 ], Okazaki, N[ 43 ], Shimizu, S[ 43 ], Tawara, T[ 43 ], Hamatsu, R[ 44 ], Kaji, H[ 44 ], Kitamura, S[, 44, 57, ], Ota, O[ 44 ], YD[ 44 ], Ri, Ferrero, Mi[, 45, 46, ], Monaco, V[, 45, Sacchi, R[, 45, Solano, A[, 45, Arneodo, M[ 47 ], Costa, M[ 47 ], Ruspa, M[ 47 ], Fourletov, S[ 48 ], Martin, JF[ 48 ], Stewart, TP[ 48 ], Boutle, SK[ 49 ], Butterworth, JM[ 49 ], Gwenlan, C[ 49 ], Jones, TW[ 49 ], Loizides, JH[ 49 ], Wing, M[ 49 ], Brzozowska, B[ 50 ], Ciborowski, J[, 50, 58, ], Grzelak, G[ 50 ], Kulinski, P[ 50 ], Luzniak, P[ 50 ], Malka, J[ 50 ], Nowak, RJ[ 50 ], Pawlak, JM[ 50 ], Tymieniecka, T[ 50 ], Ukleja, A[ 50 ], Zarnecki, AF[ 50 ], Adamus, M[ 51 ], Plucinski, P[ 51 ], Eisenberg, Y[ 52 ], Giller, I[ 52 ], Hochman, D[ 52 ], Karshon, U[ 52 ], Rosin, M[ 52 ], Brownson, E[ 53 ], Danielson, T[ 53 ], Everett, A[ 53 ], Kcira, D[ 53 ], Reeder, DD[ 53 ], Ryan, P[ 53 ], Savin, AA[ 53 ], Smith, WH[ 53 ], Wolfe, H[ 53 ], Bhadra, S[ 54 ], Catterall, CD[ 54 ], Cui, Y[ 54 ], Hartner, G[ 54 ], Menary, S[ 54 ], Noor, U[ 54 ], Standage, J[ 54 ], Whyte, J., S. CHEKANOV, M. DERRICK, S. MAGILL, B. MUSGRAVE, D. NICHOLASS, J. REPOND, R. YOSHIDA, M.C.K. MATTINGLY, M. JECHOW, N. PAVEL, A.G. YAGÜES MOLINA, S. ANTONELLI, P. ANTONIOLI, G. BARI, M. BASILE, L. BELLAGAMBA, M. BINDI, D. BOSCHERINI, A. BRUNI, G. BRUNI, L. CIFARELLI, F. CINDOLO, A. CONTIN, M. CORRADI, S. DE PASQUALE, G. IACOBUCCI, A. MARGOTTI, R. NANIA, A. POLINI, G. SARTORELLI, A. ZICHICHI, D. BARTSCH, I. BROCK, H. HARTMANN, E. HILGER, H.-P. JAKOB, M. JÜNGST, O.M. KIND, A.E. NUNCIO-QUIROZ, E. PAUL, R. RENNER, U. SAMSON, V. SCHÖNBERG, R. SHEHZADI, M. WLASENKO, N.H. BROOK, G.P. HEATH, J.D. MORRIS, M. CAPUA, S. FAZIO, A. MASTROBERARDINO, M. SCHIOPPA, G. SUSINNO, E. TASSI, J.Y. KIM, Z.A. IBRAHIM, B. KAMALUDDIN, W.A.T. WAN ABDULLAH, Y. NING, Z. REN, F. SCIULLI, J. CHWASTOWSKI, A. ESKREYS, J. FIGIEL, A. GALAS, M. GIL, K. OLKIEWICZ, P. STOPA, L. ZAWIEJSKI, L. ADAMCZYK, T. BOLD, I. GRABOWSKA-BOLD, D. KISIELEWSKA, J. LUKASIK, M. PRZYBYCIEN, L. SUSZYCKI, A. KOTANSKI, W. SLOMINSKI, V. ADLER, U. BEHRENS, C. BLOHM, A. BONATO, K. BORRAS, R. CIESIELSKI, N. COPPOLA, V. DRUGAKOV, S. FANG, J. FOURLETOVA, A. GEISER, D. GLADKOV, P. GÖTTLICHER, J. GREBENYUK, I. GREGOR, T. HAAS, W. HAIN, A. HÜTTMANN, B. KAHLE, I.I. KATKOV, U. KLEIN, U. KÖTZ, H. KOWALSKI, E. LOBODZINSKA, B. LÖHR, R. MANKEL, I.-A. MELZER-PELLMANN, S. MIGLIORANZI, A. MONTANARI, T. NAMSOO, D. NOTZ, L. RINALDI, P. ROLOFF, I. RUBINSKY, R. SANTAMARTA, U. SCHNEEKLOTH, A. SPIRIDONOV, D. SZUBA, J. SZUBA, T. THEEDT, G. WOLF, K. WRONA, C. YOUNGMAN, W. ZEUNER, W. LOHMANN, S. SCHLENSTEDT, G. BARBAGLI, E. GALLO, P. G. PELFER, A. BAMBERGER, D. DOBUR, F. KARSTENS, N.N. VLASOV, P.J. BUSSEY, A.T. DOYLE, W. DUNNE, M. FORREST, D.H. SAXON, I.O.SKILLICORN, I. GIALAS, K. PAPAGEORGIU, U. HOLM, R. KLANNER, E. LOHRMANN, P. SCHLEPER, T. SCHÖRNER-SADENIUS, J. SZTUK, H. STADIE, C. FOUDAS, C. FRY, K.R. LONG, A.D. TAPPER, T. MATSUMOTO, K. NAGANO, K. TOKUSHUKU, S. YAMADA, Y. YAMAZAKI, A.N. BARAKBAEV, E.G. BOOS, N.S. POKROVSKIY, B.O. ZHAUTYKOV, V. AUSHEV, M. BORODIN, A. KOZULIA, M. LISOVYI, D. SON, J. DE FAVEREAU, K. PIOTRZKOWSKI, F. BARREIRO, C. GLASMAN, M. JIMENEZ, L. LABARGA, J. DEL PESO, E. RON, M. SOARES, J. TERRÓN, M. ZAMBRANA, F. CORRIVEAU, C. LIU, R. WALSH, C. ZHOU, T. TSURUGAI, A. ANTONOV, B.A. DOLGOSHEIN, V. SOSNOVTSEV, A. STIFUTKIN, S. SUCHKOV, R.K. DEMENTIEV, P.F. ERMOLOV, L.K. GLADILIN, L.A. KHEIN, I.A. KORZHAVINA, V.A. KUZMIN, B.B. LEVCHENKO, O.YU. LUKINA, A.S. PROSKURYAKOV, L.M. SHCHEGLOVA, D.S. ZOTKIN, S.A. ZOTKIN, I. ABT, C. BÜTTNER, A. CALDWELL, D. KOLLAR, W.B. SCHMIDKE, J. SUTIAK, G. GRIGORESCU, A. KERAMIDAS, E. KOFFEMAN, P. KOOIJMAN, A. PELLEGRINO, H. TIECKE, M. VÁZQUEZ, L. WIGGERS, N. BRÜMMER, B. BYLSMA, L.S. DURKIN, A. LEE, T.Y. LING, P.D. ALLFREY, M.A. BELL, A.M. COOPER-SARKAR, R.C.E. DEVENISH, J. FERRANDO, B. FOSTER, K. KORCSAK-GORZO, K. OLIVER, S. PATEL, V. ROBERFROID, A. ROBERTSON, P.B. STRAUB, C. URIBE-ESTRADA, R. WALCZAK, P. BELLAN, A. BERTOLIN, R. BRUGNERA, R. CARLIN, F. DAL CORSO, S. DUSINI, A. GARFAGNINI, S. LIMENTANI, A. LONGHIN, L. STANCO, M. TURCATO, B.Y. OH, A. RAVAL, J. UKLEJA, J.J. WHITMORE, Y. IGA, G. D'AGOSTINI, G. MARINI, A. NIGRO, J.E. COLE, J.C. HART, H. ABRAMOWICZ, A. GABAREEN, R. INGBIR, S. KANANOV, A. LEVY, O. SMITH, A. STERN, M. KUZE, J. MAEDA, R. HORI, S. KAGAWA, N. OKAZAKI, S. SHIMIZU, T. TAWARA, R. HAMATSU, H. KAJI, S. KITAMURA, O. OTA, Y.D. RI, M.I. FERRERO, V. MONACO, R. SACCHI, A. SOLANO, M. ARNEODO, M. COSTA, M. RUSPA, S. FOURLETOV, J.F. MARTIN, T.P. STEWART, S.K. BOUTLE, J.M. BUTTERWORTH, C. GWENLAN, T.W. JONES, J.H. LOIZIDES, M. WING, B. BRZOZOWSKA, J. CIBOROWSKI, G. GRZELAK, P. KULINSKI, P. LUZNIAK, J. MALKA, R.J. NOWAK, J.M. PAWLAK, T. TYMIENIECKA, A. UKLEJA, A.F. ZARNECKI, M. ADAMUS, P. PLUCINSKI, Y. EISENBERG, I. GILLER, D. HOCHMAN, U. KARSHON, M. ROSIN, E. BROWNSON, T. DANIELSON, A. EVERETT, D. KÇIRA, D.D. REEDER, P. RYAN, A.A. SAVIN, W.H. SMITH, H. WOLFE, S. BHADRA, C.D. CATTERALL, Y. CUI, G. HARTNER, S. MENARY, U. NOOR, J. STANDAGE, J. WHYTE., and Zeus (IHEF, IoP, FNWI)

Subjects
Proton, Physics and Astronomy (miscellaneous), Parton, 01 natural sciences, 7. Clean energy, law.invention, rapidity dependence, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics, HERA, ZEUS Collaboration, law, transverse energy [jet], Nuclear Experiment, momentum transfer dependence [differential cross section], 318 GeV-cms, colliding beams [electron p], Physics, Luminosity (scattering theory), Perturbative QCD, resolved [photon], mass dependence, colliding beams [positron p], DESY HERA Stor, Pseudorapidity, rapidity [jet], hadroproduction [jet], perturbation theory [quantum chromodynamics], Particle physics, pair production [jet], Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Sciences de l'ingénieur, momentum spectrum [parton], x-dependence, 0103 physical sciences, ddc:530, structure function [diffraction], 010306 general physics, Collider, Engineering (miscellaneous), ZEUS (particle detector), 010308 nuclear & particles physics, Physique, parametrization, ZEUS, Astronomie, High Energy Physics::Experiment, experimental results
Abstract

Diffractive photoproduction of dijets was measured with the ZEUS detector at the ep collider HERA using an integrated luminosity of 77.2 pb-1. The measurements were made in the kinematic range Q2 < 1 GeV 2, 0.207.5 and 6.5 GeV, respectively, and to lie in the pseudorapidity range -1.5, 0, SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2008
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3. Investigation of heavy quark and multiple interactions at HERA

Author

Marti Magro, Lluis

Subjects
photoproduction [quark], D*(2010): photoproduction, showers [parton], spectrum [multiplicity], electron p: inclusive reaction, jet: associated production, photoproduction [D*(2010)], transverse momentum [differential cross section], parton: showers, rapidity dependence, quark: particle identification, heavy quark, associated production [jet], photon: resolved, colliding beams [electron p], thesis, resolved [photon], Monte Carlo [numerical calculations], quark: photoproduction, particle identification [quark], multiple scattering, DESY HERA Stor, electron p: colliding beams, differential cross section: transverse momentum, H1, multiplicity: spectrum, inclusive reaction [electron p], numerical calculations: Monte Carlo
Abstract

Universität Hamburg, Diplomarbeit, 2005; 101 pp., (2005). doi:10.3204/DESY-THESIS-2005-030, Published by Deutsches Elektronen-Synchrotron, DESY, Hamburg

Published
2005
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4. Charm jets in photoproduction at HERA

Author

Padhi, Sanjay

Subjects
electron p: deep inelastic scattering, perturbation theory [quantum chromodynamics], fragmentation [model], photoproduction [jet], D*(2010): hadronic decay, fragmentation function [quark], x-dependence, quark: charm, charm [quark], angular distribution: (2jet), parton [showers], photon: resolved, quantum chromodynamics: perturbation theory, 300: 318 GeV-cms, hadronic decay [D*(2010)], colliding beams [electron p], quark: fragmentation function, jet: photoproduction, (2jet) [angular distribution], thesis, 318 GeV-cms [300], bibliography, resolved [photon], ZEUS, DESY HERA Stor, electron p: colliding beams, differential cross section: energy dependence, model: fragmentation, energy dependence [differential cross section], deep inelastic scattering [electron p], showers: parton, experimental results
Abstract

McGill University, Diss., 2004; 278 pp., (2004). doi:10.3204/DESY-THESIS-2004-012, Published by Deutsches Elektronen-Synchrotron, DESY, Hamburg

Published
2004
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5. Next-to-leading-order predictions for $\mathrm{D^{*^\pm}}$ plus jet photoproduction at DESY HERA

Author

Heinrich, Gudrun and Kniehl, Bernd A.

Subjects
DESY HERA Stor [interpretation of experiments], High Energy Physics::Phenomenology, photoproduction [D*(2010)], resolved [photon], electroproduction [D*(2010)], nonperturbative [fragmentation function], higher-order [perturbation theory], jet [transverse momentum], rapidity spectrum, charm [quark], factorization, inclusive reaction [photon p], quantum chromodynamics, D*(2010) [rapidity spectrum], High Energy Physics::Experiment, ddc:530, angular distribution, associated production [jet], spectrum [transverse momentum], Nuclear Experiment, inclusive reaction [electron p], numerical calculations, jet [rapidity spectrum]
Abstract

We study the photoproduction of a D^{*+-} meson in association with a hadron jet at next-to-leading order in the parton model of QCD with non-perturbative fragmentation functions extracted from LEP1 data of e^+e^- annihilation. The transverse-momentum and rapidity distributions recently measured at DESY HERA in various kinematic ranges nicely agree with our theoretical predictions. This provides a useful test of the universality and the scaling violations of the fragmentation functions predicted by the factorization theorem. These comparisons also illustrate the significance of the charm component in the resolved photon. This is elaborated by investigating the cross-section distributions in x_obs^gamma and cos(theta^*).

Published
2004
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6. Can the gluon polarization in the nucleon be extracted from HERMES data on single high-$\mathrm{{p_{T}}}$ hadrons?

Author

Liebing, Patricia

Subjects
positron: polarized beam, internal [polarized target], rho(770)0, transverse momentum: high, HERMES [magnetic spectrometer], photoproduction [hadron], gluon: polarization, high [transverse momentum], radiative correction [quantum electrodynamics], 27.5 GeV, deep inelastic scattering [positron p], photon: resolved, tables, programming: Monte Carlo, magnetic spectrometer: HERMES, photoproduction [vector meson], positron p: deep inelastic scattering, thesis, parametrization, bibliography, transverse momentum: dependence, resolved [photon], polarization [gluon], hadron: photoproduction, electron deuteron: deep inelastic scattering, DESY HERA Stor, vector meson: photoproduction, quantum electrodynamics: radiative correction, dependence [transverse momentum], polarized target: internal, Monte Carlo [programming], deep inelastic scattering [electron deuteron], polarized beam [positron], asymmetry [spin], spin: asymmetry, experimental results
Abstract

Universität Hamburg, Diss., 2004; 243 pp., (2004). doi:10.3204/DESY-THESIS-2004-036, Published by Deutsches Elektronen-Synchrotron, DESY, Hamburg

Published
2004
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7. Measurements of inelastic J / psi and psi-prime photoproduction at HERA

Author

Chekanov, S., Krakauer, D., Magill, S., Musgrave, B., Repond, J., Yoshida, R., Mattingly, M. C. K., Antonioli, P., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Cara Romeo, G., Cifarelli, L., Cindolo, F., Contin, A., Corradi, M., De Pasquale, S., Giusti, P., Iacobucci, G., Margotti, A., Nania, R., Palmonari, F., Pesci, A., Sartorelli, G., Zichichi, A., Aghuzumtsyan, G., Bartsch, D., Brock, I., Goers, S., Hartmann, H., Hilger, E., Irrgang, P., Jakob, H. P., Kappes, A., Katz, U. F., Kind, O., Paul, E., Rautenberg, J., Renner, R., Schnurbusch, H., Stifutkin, A., Tandler, J., Voss, K. C., Wang, M., Weber, A., Bailey, D. S., Brook, N. H., Cole, J. E., Foster, B., Heath, G. P., Heath, Helen F., Robins, S., Rodrigues, E., Scott, J., Tapper, R. J., Wing, M., Capua, M., Mastroberardino, A., Schioppa, M., Susinno, G., Kim, J. Y., Kim, Y. K., Lee, J. H., Lim, I. T., Pac, M. Y., Caldwell, A., Helbich, M., Liu, X., Mellado, B., Ning, Y., Paganis, S., Ren, Z., Schmidke, W. B., Sciulli, F., Chwastowski, J., Eskreys, A., Figiel, J., Olkiewicz, K., Stopa, P., Zawiejski, L., Adamczyk, L., Bold, T., Grabowska-Bold, I., Kisielewska, D., Kowal, A. M., Kowal, M., Kowalski, T., Przybycien, M., Suszycki, L., Szuba, D., Szuba, J., Kotanski, A., Slominski, W., Bauerdick, L. A. T., Behrens, U., Bloch, I., Borras, K., Chiochia, V., Dannheim, D., Derrick, M., Drews, G., Fourletova, J., Fox-Murphy, A., Fricke, U., Geiser, A., Goebel, F., Gottlicher, P., Gutsche, O., Haas, Tobias M., Hain, W., Hartner, G. F., Hillert, S., Kotz, U., Kowalski, H., Kramberger, G., Labes, H., Lelas, D., Lohr, B., Mankel, R., Melzer-Pellmann, I. A., Moritz, M., Notz, D., Petrucci, M. C., Polini, A., Raval, Amita, Schneekloth, U., Selonke, F., Wessoleck, H., Wichmann, R., Wolf, G., Youngman, C., Zeuner, W., Lopez-Duran-Viani, Amaya, Meyer, A., Schlenstedt, S., Barbagli, G., Gallo, E., Genta, C., Pelfer, P. G., Bamberger, A., Benen, A., Coppola, N., Bell, M., Bussey, P. J., Doyle, A. T., Glasman, C., Hanlon, S., Lee, S. W., Lupi, A., McCance, G. J., Saxon, D. H., Skillicorn, I. O., Gialas, I., Bodmann, B., Carli, T., Holm, U., Klimek, K., Krumnack, N., Lohrmann, E., Milite, M., Salehi, H., Stonjek, S., Wick, K., Ziegler, A., Ziegler, Ar., Collins-Tooth, C., Foudas, C., Goncalo, R., Long, K. R., Metlica, F., Tapper, A. D., Cloth, P., Filges, D., Kuze, M., Nagano, K., Tokushuku, K., Yamada, S., Yamazaki, Y., Barakbaev, A. N., Boos, E. G., Pokrovskiy, N. S., Zhautykov, B. O., Lim, H., Son, D., Barreiro, F., Gonzalez, O., Labarga, L., del Peso, J., Redondo, I., Tassi, E., Terron, J., Vazquez Acosta, Monica Luisa, Barbi, M., Bertolin, A., Corriveau, F., Ochs, A., Padhi, S., Stairs, D. G., St. Laurent, M., Tsurugai, T., Antonov, A., Danilov, P., Dolgoshein, B. A., Gladkov, D., Sosnovtsev, V., Suchkov, S., Dementiev, R. K., Ermolov, P. F., Golubkov, Yu. A., Katkov, I. I., Khein, L. A., Korzhavina, I. A., Kuzmin, V. A., Levchenko, B. B., Lukina, O. Yu., Proskuryakov, A. S., Shcheglova, L. M., Vlasov, N. N., Zotkin, S. A., Bokel, C., Engelen, J., Grijpink, S., Koffeman, E., Kooijman, P., Maddox, E., Pellegrino, A., Schagen, S., Tiecke, H., Tuning, N., Velthuis, J. J., Wiggers, L., de Wolf, E., Brummer, N., Bylsma, B., Durkin, L. S., Ling, T. Y., Boogert, S., Cooper-Sarkar, Amanda M., Devenish, R. C. E., Ferrando, J., Grzelak, G., Matsushita, T., Rigby, M., Ruske, O., Sutton, M. R., Walczak, R., Brugnera, R., Carlin, R., Dal Corso, F., Dusini, S., Garfagnini, A., Limentani, S., Longhin, A., Parenti, A., Posocco, M., Stanco, L., Turcato, M., Heaphy, E. A., Oh, B. Y., Saull, P. R. B., Whitmore, J. J., Iga, Y., D'Agostini, G., Marini, G., Nigro, A., Cormack, C., Hart, J. C., McCubbin, N. A., Heusch, C., Park, I. H., Pavel, N., Abramowicz, H., Gabareen, A., Kananov, S., Kreisel, A., Levy, A., Abe, T., Fusayasu, T., Kagawa, S., Kohno, T., Tawara, T., Yamashita, T., Hamatsu, R., Hirose, T., Inuzuka, M., Kitamura, S., Matsuzawa, K., Nishimura, T., Arneodo, M., Ferrero, M. I., Monaco, V., Ruspa, M., Sacchi, R., Solano, A., Galea, R., Koop, T., Levman, G. M., Martin, J. F., Mirea, A., Sabetfakhri, A., Butterworth, J. M., Gwenlan, C., Hall-Wilton, R., Jones, T. W., Lightwood, M. S., Loizides, J. H., West, B. J., Ciborowski, J., Ciesielski, R., Nowak, R. J., Pawlak, J. M., Smalska, B., Sztuk, J., Tymieniecka, T., Ukleja, A., Ukleja, J., Zarnecki, A. F., Adamus, M., Plucinski, P., Eisenberg, Y., Gladilin, L. K., Hochman, D., Karshon, U., Kcira, D., Lammers, S., Li, L., Reeder, D. D., Savin, A. A., Smith, W. H., Deshpande, A., Dhawan, S., Hughes, V. W., Straub, P. B., Bhadra, S., Catterall, C. D., Fourletov, S., Menary, S., Soares, M., Standage, J., and ZEUS Collaboration

Subjects
perturbation theory [quantum chromodynamics], color: octet, leptonic decay [psi mesons], approx. 300 GeV-cms, J/psi(3100): helicity, transverse momentum dependence, photoproduction [psi(3685)], energy dependence, psi mesons: leptonic decay, photoproduction [J/psi(3100)], helicity [J/psi(3100)], J/psi(3100): photoproduction, positron p: inelastic scattering, inelastic scattering [positron p], ddc:530, angular distribution, photon: resolved, quantum chromodynamics: perturbation theory, ratio [channel cross section], tables, psi(3685): photoproduction, octet [color], resolved [photon], singlet [color], ZEUS, positron p: colliding beams, colliding beams [positron p], DESY HERA Stor, color: singlet, channel cross section: ratio, experimental results
Abstract

38 pp. (2003)., The cross sections for inelastic photoproduction of J/psi and psi' mesons have been measured in ep collisions with the ZEUS detector at HERA, using an integrated luminosity of 38.0 pb-1. The events were required to have 0.1 < z < 0.9 and 50 < W < 180 GeV, where z is the fraction of the incident photon energy carried by the J/psi in the proton rest frame and W is the photon-proton centre-of-mass energy. The psi' to J/psi cross-section ratio was measured in the range 0.55 < z < 0.9. The J/psi data, for various ranges of transverse momentum, are compared to theoretical models incorporating colour-singlet and colour-octet matrix elements. Predictions of a next-to-leading-order colour-singlet model give a good description of the data, although there is a large normalisation uncertainty. The J/psi helicity distribution for z > 0.4 is compared to leading-order QCD predictions.

Published
2003
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8. Theoretical investigations of heavy quarkonium production in photon photon collisions

Author

Mihaila, Luminita

Subjects
two-photon [exchange], pair production [jet], nonrelativistic [quantum chromodynamics], electron positron: inelastic scattering, 189 GeV-cms, emission [photon], CERN LEP Stor [interpretation of experiments], model: parton, exclusive reaction [photon photon], photoproduction [J/psi(3100)], photon: emission, J/psi(3100): photoproduction, radiative correction, channel cross section: energy dependence, photon: resolved, emission [gluon], numerical calculations, exchange: two-photon, quantum chromodynamics: nonrelativistic, photon photon: exclusive reaction, inelastic scattering [electron positron], interpretation of experiments: CERN LEP Stor, thesis, bibliography, resolved [photon], energy dependence [channel cross section], parton [model], gluon: emission, rapidity spectrum, transverse momentum: spectrum, jet: pair production, spectrum [transverse momentum], renormalization group
Abstract

Universität Hamburg, Diss., 2002; 136 pp., (2002). doi:10.3204/DESY-THESIS-2002-054, Published by Deutsches Elektronen-Synchrotron, DESY, Hamburg

Published
2002
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9. Evidence for color octet mechanism from CERN LEP-2 $\gamma \gamma \to J/\psi$ + $X$ data

Author

Klasen, M., Kniehl, Bernd A., Mihaila, L. N., and Steinhauser, M.

Subjects
two-photon [exchange], octet [color], Astrophysics::High Energy Astrophysical Phenomena, inelastic scattering [electron positron], High Energy Physics::Phenomenology, nonrelativistic [quantum chromodynamics], bibliography, resolved [photon], inclusive reaction [photon photon], CERN LEP Stor [interpretation of experiments], electroproduction [J/psi(3100)], photoproduction [J/psi(3100)], factorization, ddc:550, High Energy Physics::Experiment, spectrum [transverse momentum], Nuclear Experiment, numerical calculations
Abstract

We present theoretical predictions for the transverse-momentum distribution of J/psi mesons promptly produced in gamma gamma collisions within the factorization formalism of nonrelativistic quantum chromodynamics, including the contributions from both direct and resolved photons, and we perform a conservative error analysis. The fraction of J/psi mesons from decays of bottom-flavoured hadrons is estimated to be negligibly small. New data taken by the DELPHI Collaboration at LEP2 nicely confirm these predictions, while they disfavour those obtained within the traditional colour-singlet model.

Published
2002
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10. $J/\psi$ production through resolved photon processes at $e^{+} e^{-}$ colliders

Author

Godbole, R. M., Indumathi, D., and Kramer, M.

Subjects
two-photon [exchange], color: octet, 14.40.Lb, electron positron: inelastic scattering, interaction [photon photon], photon photon: interaction, photoproduction [J/psi(3100)], J/psi(3100): photoproduction, photon: structure function, ddc:530, channel cross section: energy dependence, photon: resolved, numerical calculations, exchange: two-photon, octet [color], electron positron: linear collider, inelastic scattering [electron positron], resolved [photon], backscatter: laser, energy dependence [channel cross section], structure function [photon], 12.38.Bx, transverse momentum: spectrum, spectrum [transverse momentum], 13.60.Le, laser [backscatter], linear collider [electron positron]
Abstract

14 pp. (2002)., We consider $J/\psi$ photoproduction in $e^+ e^-$ as well as linear photon colliders. We find that the process is dominated by the resolved photon channel. Both the once-resolved and twice-resolved cross-sections are sensitive to (different combinations of) the colour octet matrix elements. Hence, this may be a good testing ground for colour octet contributions in NRQCD. On the other hand, the once-resolved J/psi production cross-section, particularly in a linear photon collider, is sensitive to the gluon content of the photon. Hence these cross-sections can be used to determine the parton distribution functions, especially the gluon distribution, in a photon, if the colour octet matrix elements are known.

Published
2002
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11. Photoproduction of $J / \psi$ Mesons at Medium and Low Elasticities at HERA

Author

Krueger, Katja

Subjects
perturbation theory [quantum chromodynamics], fusion [gluon gluon], electron p: inelastic scattering, transverse momentum [differential cross section], photoproduction [J/psi(3100)], momentum spectrum [gluon], photon gluon: fusion, J/psi(3100): photoproduction, angular distribution, pair production [muon], channel cross section: energy dependence, quantum chromodynamics: perturbation theory, photon: resolved, fusion [photon gluon], colliding beams [electron p], tables, thesis, gluon: momentum spectrum, bibliography, singlet [color], resolved [photon], energy dependence [channel cross section], muon: pair production, J/psi(3100): leptonic decay, DESY HERA Stor, electron p: colliding beams, inelastic scattering [electron p], differential cross section: transverse momentum, gluon gluon: fusion, H1, color: singlet, leptonic decay [J/psi(3100)], experimental results
Abstract

Universität Hamburg, Diss., 2001; 136 pp. (2001). = Universität Hamburg, Diss., 2001

Published
2001
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12. Probing the parton evolution in DIS at low $x_{BJ}$ using jet observables

Author

Riveline, Michael and Corriveau, F.

Subjects
small-x, Lipatov equation, approx. 300 GeV-cms, structure function [p], event shape analysis, differential cross section: x-dependence, dipole [color], DGLAP equation, jet: electroproduction, production: small-angle, deep inelastic scattering [positron p], p: structure function, angular correlation: (2jet), photon: resolved, electroproduction [jet], positron p: deep inelastic scattering, thesis, x-dependence [differential cross section], bibliography, (2jet) [angular correlation], resolved [photon], ZEUS, small-angle [production], positron p: colliding beams, colliding beams [positron p], parton [momentum spectrum], momentum spectrum: parton, DESY HERA Stor, color: dipole, experimental results
Abstract

196 pp. (1998)., The advent of the $ep$ collider HERA at the DESY research center has opened a wide kinematical wi11dow for the study of the Deep Inelastic Scattering (DIS) processes $e^+{p} \to e^+{X}$. Recent measurements of the structure function $F_2$ of the proton have confirmed the fact that the Bjorken scaling which arises from the naive Quark-Parton Model is broken in the limit where the scaling variable, $x$-Bjorken, is small. It also revealed that $F_2$ grows exponentially with $x$-Bjorken at low $x$. The standard picture of parton evolution, based on the DGLAP equations, reproduces this steep rise if it is used with an appropriate set of $F_2$ parametrizations. However these parametrizations iuclude 'ad-hoc' assumptions on the non-perturbative behavior or the structure functions and depend on a large set of phenomenological parameters. The steep rise can also be reproduced by using different perturbative treatment for the parton evolution. This treatment, based on the BFKL evolution equations, differs from the standard DGLAP picture by the lack of ordering in the transverse energy of the emitted partons. Unlike DGLAP, the BFKL picture reproduces the steep rise of $F_2$ without assuming any particular shape of the structure function in the non-perturbative domain. In order to gain an insight on parton dynamics in DIS at low $x$ and discriminate between these two pictures, jet observables are used as they are expected to be closely related to the hard scattering and depend only slightly on the hadronization effects. Two jet observables are studied here in more details: the azimuthal correlation between the two leading-order jets and the cross section of the forward jet production. The measured cross sections are corrected for detector effects and compared to several DIS Monte Carlo models and next-to-leading order simulations over a wide kinematic range. The results are evaluated in the lightof the BFKL and the DGLAP pictures. The experimental results are compared to other models of parton evolution as well, like the Colour Dipole Model (CDM), the Linked Dipole Chain (LDC) and the resolved photon model in DIS.

Published
1998
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13. Jet shapes in $e p$ and $p \bar{p}$ collisions in NLO QCD

Author

Klasen, M. and Kramer, G.

Subjects
electroproduction [jet], inclusive reaction [anti-p p], High Energy Physics::Phenomenology, resolved [photon], photoproduction [jet], event shape analysis, direct production [jet], parton [model], higher-order [perturbation theory], rapidity, interpretation of experiments [numerical calculations], quantum chromodynamics, hadroproduction [jet], High Energy Physics::Experiment, ddc:530, Nuclear Experiment, inclusive reaction [electron p], transverse energy
Abstract

We have calculated jet shapes in low $Q^2$ $ep$ and $p\overline{p}$ collisions in perturbation theory at order $\alpha_s^3$ for the hard parton-parton processes. For the $\gamma p$ process resolved and direct contributions are superimposed. The dependence of the jet shapes on transverse energy, rapidity, and inner cone extension is studied. The numerical results of the calculation are compared with recent data from ZEUS at HERA and from CDF and D0 at the TEVATRON. Good agreement is achieved if the problem of merging overlapping jets is taken into account by varying the parameter $R_{sep}$ as a function of transverse energy and rapidity.

Published
1997
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14. Low $x$ physics at HERA

Author

Levy, Anna

Subjects
lectures: Banz 1995/10/10, electron p: deep inelastic scattering, structure function: pomeron, small-x, gap [rapidity], DESY HERA Stor [interpretation of experiments], neutral current, Lipatov equation, interpretation of experiments: DESY HERA Stor, diffraction, structure function [p], photoproduction [hadron], Banz 1995/10/10 [lectures], charged current, DGLAP equation, strong interaction: coupling constant, quantum chromodynamics, photon: structure function, p: structure function, photon: resolved, numerical calculations, high energy behavior [total cross section], Regge poles, parametrization, bibliography, resolved [photon], hadron: photoproduction, one-pion [exchange], pomeron [structure function], total cross section: high energy behavior, rapidity: gap, parton [momentum spectrum], momentum spectrum: parton, structure function [photon], exchange: pomeron, deep inelastic scattering [electron p], exchange: one-pion, coupling constant [strong interaction], pomeron [exchange]
Abstract

440303 152 pp. (1997).

Published
1997
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15. Inclusive parton cross-sections in photoproduction and photon structure

Author

Ahmed, T., Aid, S., Baranov, P., Ferencei, J., Ferrarotto, F., Flamm, K., Fleischer, M., Flieser, M., Flugge, G., Fomenko, A., Fominykh, B., Forbush, M., Formanek, J., Barrelet, E., Foster, J. M., Franke, G., Fretwurst, E., Gabathuler, E., Gabathuler, K., Gamerdinger, K., Garvey, J., Gayler, Joerg, Gebauer, M., Gellrich, A., Bartel, W., Genzel, H., Gerhards, R., Goerlach, U., Goerlich, L., Gogitidze, N., Goldberg, M., Goldner, D., Gonzalez-Pineiro, B., Gorelov, I., Gorichev, P., Barth, M., Grab, C., Grassler, H., Grassler, R., Greenshaw, T., Grindhammer, Guenter, Gruber, A., Gruber, C., Haack, J., Haidt, D., Hajduk, L., Bassler, U., Hamon, O., Hampel, M., Hanlon, E. M., Hapke, M., Haynes, W. J., Heatherington, J., Heinzelmann, G., Henderson, R. C. W., Henschel, H., Herynek, I., Beck, H. P., Hess, M. F., Hildesheim, W., Hill, P., Hiller, K. H., Hilton, C. D., Hladky, J., Hoeger, K. C., Hoppner, M., Horisberger, R., Hudgson, V. L., Behrend, H. J., Huet, P., Hutte, M., Hufnagel, H., Ibbotson, M., Itterbeck, H., Jabiol, M. A., Jacholkowska, A., Jacobsson, C., Jaffre, M., Janoth, J., Belousov, A., Jansen, T., Jonsson, L., Johnson, D. P., Johnson, L., Jung, H., Kalmus, P. I. P., Kant, D., Kaschowitz, R., Kasselmann, P., Kathage, U., Berger, Christoph, Katzy, J., Kaufmann, H. H., Ghazaryan, Samvel, Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, Christian M., Klein, M., Kleinwort, C., Knies, G., Bernardi, G., Ko, W., Kohler, T., Kohne, J., Kolanoski, H., Kole, F., Kolya, S. D., Korbel, V., Korn, M., Kostka, P., Kotelnikov, S. K., Andreev, V., Bernet, R., Kramerkamper, T., Krasny, M. W., Krehbiel, H., Krucker, D., Kruger, U., Kruner-Marquis, U., Kubenka, J. P., Kuster, H., Kuhlen, M., Kurca, T., Bertrand-Coremans, G., Kurzhofer, J., Kuznik, B., Lacour, D., Lamarche, F., Lander, R., Landon, M. P. J., Lange, W., Lanius, P., Laporte, J. F., Lebedev, A., Besancon, M., Leverenz, C., Levonian, S., Ley, C., Lindner, A., Lindstrom, G., Link, J., Linsel, F., Lipinski, J., List, B., Lobo, G., Beyer, R., Loch, P., Lohmander, H., Lomas, J., Lopez, G. C., Lyubimov, V., Luke, D., Magnussen, N., Malinovski, E., Mani, S., Maracek, R., Biddulph, P., Marage, P., Marks, J., Marshall, R., Martens, J., Martin, R., Martyn, H. U., Martyniak, J., Masson, S., Mavroidis, T., Maxfield, S. J., Bispham, P., McMahon, S. J., Mehta, A., Meier, K., Mercer, D., Merz, T., Meyer, C. A., Meyer, H., Meyer, J., Migliori, A., Mikocki, S., Bizot, J. C., Milstead, D., Moreau, F., Morris, J. V., Mroczko, E., Muller, G., Muller, K., Murin, P., Nagovizin, V., Nahnhauer, R., Naroska, B., Blobel, V., Naumann, T., Newman, Paul R., Newton, D., Neyret, D., Nguyen, H. K., Nicholls, T. C., Niebergall, F., Niebuhr, C., Niedzballa, C., Nisius, R., Borras, K., Nowak, G., Noyes, G. W., Nyberg-Werther, M., Oakden, M., Oberlack, H., Obrock, U., Olsson, J. E., Ozerov, D., Panaro, E., Panitch, A., Botterweck, F., Pascaud, C., Patel, G. D., Peppel, E., Perez, E., Phillips, J. P., Pichler, C., Pieuchot, A., Pitzl, D., Pope, G., Prell, Soeren A., Andrieu, B., Boudry, V., Prosi, R., Rabbertz, K., Radel, G., Raupach, F., Reimer, P., Reinshagen, S., Ribarics, P., Rick, H., Riech, V., Riedlberger, J., Braemer, A., Riess, S., Rietz, M., Rizvi, E., Robertson, S. M., Robmann, P., Roloff, H. E., Roosen, R., Rosenbauer, K., Rostovtsev, A., Rouse, F., Brasse, F., Royon, C., Ruter, K., Rusakov, S., Rybicki, K., Rylko, R., Sahlmann, N., Salesch, S. G., Sanchez, E., Sankey, D. P., Schacht, P., Braunschweig, W., Schiek, S., Schleper, P., von Schlippe, W., Schmidt, C., Schmidt, D., Schmidt, G., Schoning, A., Schroder, V., Schuhmann, E., Schwab, B., Brisson, V., Schwind, A., Sefkow, F., Seidel, M., Sell, R., Semenov, A., Chekelian, V. I., Sheviakov, I., Shooshtari, H., Shtarkov, L. N., Siegmon, G., Bruncko, D., Siewert, U., Sirois, Y., Skillicorn, I. O., Smirnov, P., Smith, J. R., Solochenko, V., Solovev, Ya., Spiekermann, J., Spielman, S., Spitzer, H., Brune, C., Starosta, R., Steenbock, M., Steffen, P., Steinberg, R., Stella, B., Stephens, K., Stier, J., Stiewe, J., Stosslein, U., Stolze, K., Buchholz, R., Strachota, J., Straumann, U., Struczinski, W., Sutton, J. P., Tapprogge, S., Chernyshov, V., Thiebaux, C., Thompson, Graham, Truoel, Peter, Turnau, J., Bungener, L., Tutas, J., Ulkes, P., Usik, A., Valkar, S., Valkarova, A., Vallee, C., Van Esch, P., Van Mechelen, P., Vartapetian, A., Vazdik, Y., Burger, J., Verrecchia, P., Villet, G., Wacker, K., Wagener, A., Wagener, M., Walker, I. W., Walther, A., Weber, G., Weber, M., Wegener, D., Appuhn, R. D., Busser, F. W., Wegner, A., Wellisch, H. P., West, L. R., Willard, S., Winde, M., Winter, G. G., Wittek, C., Wright, A. E., Wunsch, E., Wulff, N., Bunyatyan, A., Yiou, T. P., Zacek, J., Zarbock, D., Zhang, Z., Zhokin, A., Zimmer, M., Zimmermann, W., Zomer, F., Zuber, K., H1 Collaboration, Burke, Stephen, Burton, M., Buschhorn, G., Campbell, A. J., Carli, T., Charles, F., Charlet, M., Clarke, D., Arpagaus, M., Clegg, Arthur B., Clerbaux, B., Colombo, M., Contreras, J. G., Cormack, C., Coughlan, J. A., Courau, A., Coutures, C., Cozzika, G., Criegee, L., Babaev, A., Cussans, D. G., Cvach, J., Dagoret, S., Dainton, J. B., Dau, W. D., Daum, K., David, M., Delcourt, B., Del Buono, L., de Roeck, A., Baehr, J., De Wolf, E. A., Di Nezza, P., Dollfus, C., Dowell, J. D., Dreis, H. B., Droutskoi, V., Duboc, J., Duellmann, Dirk, Dunger, O., Duhm, H., Ban, J., Ebert, J., Ebert, T. R., Eckerlin, Guenter, Efremenko, V., Egli, S., Ehrlichmann, H., Eichenberger, S., Eichler, R., Eisele, F., Eisenhandler, E., Ban, Y., Ellison, R. J., Elsen, E., Erdmann, M., Erdmann, W., Evrard, E., Favart, L., Fedotov, A., Feeken, D., Felst, R., and Feltesse, J.

Subjects
interaction [photon p], pair production [jet], transverse momentum [cross section], correlation: (jet parton), photoproduction [jet], 296 GeV-cms, energy flow [transverse energy], rapidity dependence, photon p: interaction, photon p [interaction], photoproduction: jet, cross section: transverse momentum, ddc:530, (jet parton) [correlation], photon: resolved, exchange [one-photon], colliding beams [electron p], transverse momentum: parton, interaction: photon p, jet: photoproduction, DESY DESY HERA Stor Stor, pair production: jet, bibliography, resolved [photon], one-photon: exchange, electron p [colliding beams], jet [pair production], jet [photoproduction], parton [momentum spectrum], angular dependence, colliding beams: electron p, momentum spectrum: parton, electron p: colliding beams, transverse energy: energy flow, one-photon [exchange], jet: pair production, H1, parton [transverse momentum], exchange: one-photon, experimental results
Abstract

23 pp. (1995)., Photoproduction of 2-jet events is studied with the H1 detector at HERA. Parton cross sections are extracted from the data by an unfolding method using leading order parton-jet correlations of a QCD generator. The gluon distribution in the photon is derived in the fractional momentum range 0.04 ⩽ x γ ⩽ 1 at the average factorization scale 75 GeV 2 .

Published
1995
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16. Study of the Photon Remnant in Resolved Photoproduction at HERA

Author

Behrens, Bruce Henry

Subjects
interaction [photon p], multiple production [jet], transverse [energy flow], Astrophysics::High Energy Astrophysical Phenomena, thesis, resolved [photon], ZEUS, photoproduction [jet], longitudinal [energy flow], cluster [event shape analysis], 296 GeV-cms, transverse momentum [jet], high [transverse momentum], DESY HERA Stor, one-photon [exchange], High Energy Physics::Experiment, Nuclear Experiment, colliding beams [electron p], photoproduction, experimental results
Abstract

Photoproduction at HERA is studieci in ep colüsions, using the ZEUS detector, for $\gamma$p center-of-mass energies ranging from 130-270 GeV. A sample of events with two high-pt Jets (pt > 6 GeV, $\eta$ < l .6) and a third düster in the approximate direction of the eiectron beam is isolated using a clustering algorithm. These events are mostly due to resolved photoproduction. The third cluster is identified äs the photon remnant. Its properties, such äs the transverse and longitudinal energy flows around the axis of the cluster, are consistent with those commonly attributed to jets, and in particular with those found for the other two jets in these events. The mean value of the photon remnant pj with respect to the beam axis, measured to be 2.1 ± 0.2 GeV, is substatltial

Published
1995
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17. Study of the photon remnant in resolved photoproduction at HERA

Author

Derrick, M., Krakauer, D., Magill, S., Mikunas, D., Musgrave, B., Repond, J., Stanek, R., Talaga, R. L., Zhang, H., Ayad, R., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Bruni, P., Cara Romeo, G., Castellini, G., Chiarini, M., Cifarelli, L., Cindolo, F., Contin, A., Corradi, M., Gialas, I., Giusti, P., Iacobucci, G., Laurenti, G., Levi, G., Margotti, A., Massam, T., Nania, R., Nemoz, C., Palmonari, F., Polini, A., Sartorelli, G., Timellini, R., Zamora Garcia, Y., Zichichi, A., Bargende, A., Crittenden, J., Desch, K., Diekmann, B., Doeker, T., Eckert, M., Feld, L., Frey, A., Geerts, M., Geitz, G., Grothe, M., Haas, Tobias M., Hartmann, H., Heinloth, K., Hilger, E., Jakob, H. P., Katz, U. F., Mari, S. M., Mass, A., Mengel, S., Mollen, J., Paul, E., Rembser, C., Schramm, D., Stamm, J., Wedemeyer, R., Campbell-Robson, S., Cassidy, A., Dyce, N., Foster, B., George, S., Gilmore, R., Heath, G. P., Heath, Helen F., Llewellyn, T. J., Morgado, C. J. S., Norman, D. J. P., O'Mara, J. A., Tapper, R. J., Wilson, S. S., Yoshida, R., Rau, R. R., Arneodo, M., Iannotti, L., Schioppa, M., Susinno, G., Bernstein, A., Caldwell, A., Cartiglia, N., Parsons, J. A., Ritz, S., Sciulli, F., Straub, P. B., Wai, L., Yang, S., Zhu, Q., Borzemski, P., Chwastowski, J., Eskreys, A., Piotrzkowski, K., Zachara, M., Zawiejski, L., Adamczyk, L., Bednarek, B., Jelen, K., Kisielewska, D., Kowalski, T., Rulikowska-Zarebska, E., Suszycki, L., Zajac, J., Kotanski, A., Przybycien, M., Bauerdick, L. A. T., Behrens, U., Beier, H., Bienlein, J. K., Coldewey, C., Deppe, O., Desler, K., Drews, G., Flasinski, M., Gilkinson, D. J., Glasman, C., Gottlicher, P., Grosse-Knetter, J., Gutjahr, B., Hain, W., Hasell, D., Hessling, H., Iga, Y., Joos, P., Kasemann, M., Klanner, R., Koch, W., Kopke, L., Kotz, U., Kowalski, H., Labs, J., Ladage, A., Lohr, B., Lowe, M., Luke, D., Mainusch, J., Manczak, O., Monteiro, T., Ng, J. S. T., Nickel, S., Notz, D., Ohrenberg, K., Roco, M., Rohde, M., Roldan, J., Schneekloth, U., Schulz, W., Selonke, F., Stiliaris, E., Surrow, B., Voss, T., Westphal, D., Wolf, G., Youngman, C., Zhou, J. F., Grabosch, H. J., Kharchilava, A., Leich, A., Mattingly, M. C. K., Meyer, A., Schlenstedt, S., Wulff, N., Barbagli, G., Pelfer, P., Anzivino, G., Maccarrone, G., De Pasquale, S., Votano, L., Bamberger, A., Eisenhardt, S., Freidhof, A., Soldner-Rembold, S., Schroder, J., Trefzger, T., Brook, N. H., Bussey, P. J., Doyle, A. T., Fleck, I., Saxon, D. H., Utley, M. L., Wilson, A. S., Dannemann, A., Holm, U., Horstmann, D., Neumann, T., Sinkus, R., Wick, K., Badura, E., Burow, B. D., Hagge, L., Lohrmann, E., Milewski, J., Nakahata, M., Pavel, N., Poelz, G., Schott, W., Zetsche, F., Bacon, T. C., Butterworth, I., Gallo, E., Harris, V. L., Hung, B. H., Long, K. R., Miller, D. B., Morawitz, P. P. O., Prinias, A., Sedgbeer, J. K., Whitfield, A. F., Mallik, U., McCliment, E., Wang, M. Z., Wang, S. M., Wu, J. T., Zhang, Y., Cloth, P., Filges, D., An, S. H., Hong, S. M., Nam, S. W., Park, S. K., Suh, M. H., Yon, S. H., Imlay, R., Kartik, S., Kim, H. J., McNeil, R. R., Metcalf, W., Nadendla, V. K., Barreiro, F., Cases, G., Fernandez, J. P., Graciani, R., Hernandez, J. M., Hervas, L., Labarga, L., Martinez, M., del Peso, J., Puga, J., Terron, J., de Troconiz, J. F., Smith, G. R., Corriveau, F., Hanna, D. S., Hartmann, J., Hung, L. W., Lim, J. N., Matthews, C. G., Patel, P. M., Sinclair, L. E., Stairs, D. G., St. Laurent, M., Ullmann, R., Zacek, G., Bashkirov, V., Dolgoshein, B. A., Stifutkin, A., Bashindzhagian, G. L., Ermolov, P. F., Gladilin, L. K., Golubkov, Y. A., Kobrin, V. D. D., Kuzmin, V. A., Proskuryakov, A. S., Savin, A. A., Shcheglova, L. M., Solomin, A. N., Zotov, N. P., Botje, M., Chlebana, F., Dake, A., Engelen, J., de Kamps, M., Kooijman, P., Kruse, A., Tiecke, H., Verkerke, W., Vreeswijk, M., Wiggers, L., de Wolf, E., van Woudenberg, R., Acosta, D., Bylsma, B., Durkin, L. S., Honscheid, K., Li, C., Ling, T. Y., McLean, K. W., Murray, W. N., Park, I. H., Romanowski, T. A., Seidlein, R., Bailey, D. S., Byrne, A., Cashmore, R. J., Cooper-Sarkar, Amanda M., Devenish, R. C. E., Harnew, N., Lancaster, M., Lindemann, L., McFall, J., Nath, C., Noyes, V. A., Quadt, A., Tickner, J. R., Uijterwaal, H., Walczak, R., Waters, D. S., Wilson, F. F., Yip, T., Abbiendi, G., Bertolin, A., Brugnera, R., Carlin, R., Dal Corso, F., De Giorgi, M., Dosselli, U., Limentani, S., Morandin, M., Posocco, M., Stanco, L., Stroili, R., Voci, C., Bulmahn, J., Butterworth, J. M., Feild, R. G., Oh, B. Y., Whitmore, J. J., D'Agostini, G., Marini, G., Nigro, A., Tassi, E., Hart, J. C., McCubbin, N. A., Prytz, K., Shah, T. P., Short, T. L., Barberis, E., Dubbs, T., Heusch, C., Van Hook, M., Hubbard, B., Lockman, William S., Rahn, J. T., Sadrozinski, H. F. W., Seiden, A., Biltzinger, J., Seifert, R. J., Schwarzer, O., Walenta, A. H., Zech, Gunter, Abramowicz, H., Briskin, G., Dagan, S., Levy, A., Hasegawa, T., Hazumi, M., Ishii, T., Kuze, M., Mine, S., Nagasawa, Y., Nakao, M., Suzuki, I., Tokushuku, K., Yamada, S., Yamazaki, Y., Chiba, M., Hamatsu, R., Hirose, T., Homma, K., Kitamura, S., Nakamitsu, Y., Yamauchi, K., Cirio, R., Costa, M., Ferrero, M. I., Lamberti, L., Maselli, S., Peroni, C., Sacchi, R., Solano, A., Staiano, A., Dardo, M., Bailey, David C., Bandyopadhyay, D., Benard, F., Brkic, M., Crombie, M. B., Gingrich, D. M., Hartner, G. F., Joo, K. K., Levman, G. M., Martin, J. F., Orr, R. S., Sampson, Cortney R., Teuscher, R. J., Catterall, C. D., Jones, T. W., Kaziewicz, P. B., Lane, J. B., Saunders, R. L., Shulman, J., Blankenship, K., Lu, B., Mo, L. W., Bogusz, W., Charchula, K., Ciborowski, J., Gajewski, J., Grzelak, G., Kasprzak, M., Krzyzanowski, M., Muchorowski, K., Nowak, R. J., Pawlak, J. M., Tymieniecka, T., Wroblewski, A. K., Zakrzewski, Janusz Andrzej, Zarnecki, A. F., Adamus, M., Eisenberg, Y., Karshon, U., Revel, D., Zer-Zion, D., Ali, I., Badgett, W. F., Behrens, B., Dasu, S., Fordham, C., Foudas, C., Goussiou, A., Loveless, R. J., Reeder, D. D., Silverstein, S., Smith, W. H., Vaiciulis, A., Wodarczyk, M., Tsurugai, T., Bhadra, S., Cardy, M. L., Fagerstroem, C. P., Frisken, William R., Furutani, K. M., Khakzad, M., Schmidke, W. B., and ZEUS Collaboration

Subjects
interaction [photon p], multiple production [jet], transverse momentum: high, multiple production: jet, photoproduction [jet], 296 GeV-cms, high [transverse momentum], energy flow [transverse energy], photon p: interaction, photon p [interaction], photoproduction: jet, jet: multiple production, ddc:530, photon: resolved, energy flow: longitudinal, exchange [one-photon], colliding beams [electron p], interaction: photon p, jet: photoproduction, DESY DESY HERA Stor Stor, event shape analysis: cluster, resolved [photon], one-photon: exchange, ZEUS, longitudinal [energy flow], electron p [colliding beams], cluster [event shape analysis], jet [photoproduction], colliding beams: electron p, electron p: colliding beams, rapidity spectrum, transverse energy: energy flow, one-photon [exchange], jet [multiple production], exchange: one-photon, experimental results
Abstract

15 pp. (1995)., Photoproduction at HERA is studied in ep collisions, with the ZEUS detector, for γp centre-of-mass energies ranging from 130–270 GeV. A sample of events with two high- p T jets ( p T > 6 GeV, η < 1.6) and a third cluster in the approximate direction of the electron beam is isolated using a clustering algorithm. These events are mostly due to resolved photoproduction. The third cluster is identified as the photon remnant. Its properties, such as the transverse and longitudinal energy flows around the axis of the cluster, are consistent with those commonly attributed to jets, and in particular with those found for the two jets in these events. The mean value of the photon remnant p T with respect to the beam axis is measured to be 2.1 ± 0.2 GeV, which demonstrates substantial mean transverse momenta for the photon remnant.

Published
1995
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18. Photoproduction of jets at HERA in next-to-leading order QCD

Author

Michael Klasen

Subjects
electroproduction [jet], interaction [photon p], factorization [dependence], DESY HERA Stor [interpretation of experiments], thesis, spectrum [transverse energy], dependence [renormalization], bibliography, resolved [photon], photoproduction [jet], Monte Carlo [numerical calculations], structure function [p], direct production [jet], parton [model], higher-order [perturbation theory], parton [momentum spectrum], structure function [photon], rapidity spectrum, (2jet) [final state], quantum chromodynamics, differential cross section, deep inelastic scattering [electron p], higher-order [Feynman graph], S-matrix
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19. Jet production at HERA with the ZEUS detector: Resolved and direct processes in photoproduction and the gluon content of the proton and the photon

Author

Claudia Glasman

Subjects
rapidity dependence [differential cross section], thesis, diffraction, differential cross section [transverse energy], resolved [photon], transverse energy [differential cross section], ZEUS, photoproduction [jet], electron p [colliding beams], structure function [p], 296 GeV-cms, high [transverse momentum], jet [photoproduction], DESY HERA Stor, momentum spectrum [gluon], (2jet) [final state], (hadron electron) [particle identification], differential cross section [rapidity dependence], parton [showers], final state [(2jet)], inclusive reaction [electron p], low [momentum transfer], leading logarithm approximation, colliding beams [electron p], experimental results
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20. Measurement of $\pi^0$ -Meson Cross Sections at low Bjorken-$x$ in Deep-Inelastic ep-Collisions at $\sqrt {s} =$ 300 GeV

Author

Thorsten Wengler

Subjects
perturbation theory [quantum chromodynamics], small-x, Thesis, electroproduction [pi0], Lipatov equation, approx. 300 GeV-cms, bibliography, resolved [photon], high [transverse momentum], rapidity dependence, x-dependence, colliding beams [positron p], DGLAP equation, DESY HERA Stor, H1, dependence [transverse momentum], deep inelastic scattering [positron p], momentum transfer [differential cross section], +pi0+positron+anything%22">positron p --> pi0 positron anything, experimental results

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