Search

Your search keyword '"Semenov A.Y."' showing total 9 results
Start Over Author "Semenov A.Y." Search Limiters Full Text
9 results on '"Semenov A.Y."'

1. Beam asymmetry ς for the photoproduction of η and η′ mesons at Eγ=8.8 GeV

Author

Adhikari, S. Ali, A. Amaryan, M. Austregesilo, A. Barbosa, F. Barlow, J. Barnes, A. Barriga, E. Barsotti, R. Beattie, T.D. Berdnikov, V.V. Black, T. Boeglin, W. Boer, M. Briscoe, W.J. Britton, T. Brooks, W.K. Cannon, B.E. Cao, N. Chudakov, E. Cole, S. Cortes, O. Crede, V. Dalton, M.M. Daniels, T. Deur, A. Dobbs, S. Dolgolenko, A. Dotel, R. Dugger, M. Dzhygadlo, R. Egiyan, H. Erbora, T. Ernst, A. Eugenio, P. Fanelli, C. Fegan, S. Foda, A.M. Foote, J. Frye, J. Furletov, S. Gan, L. Gasparian, A. Gevorgyan, N. Gleason, C. Goetzen, K. Goncalves, A. Goryachev, V.S. Guo, L. Hakobyan, H. Hamdi, A. Huber, G.M. Hurley, A. Ireland, D.G. Ito, M.M. Jarvis, N.S. Jones, R.T. Kakoyan, V. Kalicy, G. Kamel, M. Kourkoumelis, C. Kuleshov, S. Larin, I. Lawrence, D. Lersch, D.I. Li, H. Li, W. Liu, B. Livingston, K. Lolos, G.J. Lyubovitskij, V. Mack, D. Marukyan, H. Mattione, P. Matveev, V. McCaughan, M. McCracken, M. McGinley, W. Meyer, C.A. Miskimen, R. Mitchell, R.E. Nerling, F. Ng, L. Ostrovidov, A.I. Papandreou, Z. Patsyuk, M. Paudel, C. Pauli, P. Pedroni, R. Pentchev, L. Peters, K.J. Phelps, W. Pooser, E. Qin, N. Reinhold, J. Ritchie, B.G. Robison, L. Romanov, D. Romero, C. Salgado, C. Schertz, A.M. Schumacher, R.A. Schwiening, J. Semenov, A.Y. Semenova, I.A. Seth, K.K. Shen, X. Shepherd, M.R. Smith, E.S. Sober, D.I. Somov, A. Somov, S. Soto, O. Staib, M. Stevens, J.R. Strakovsky, I.I. Suresh, K. Tarasov, V.V. Teymurazyan, A. Thiel, A. Vasileiadis, G. Whitlatch, T. Wickramaarachchi, N. Williams, M. Xiao, T. Yang, Y. Zarling, J. Zhang, Z. Zhao, G. Zhou, Q. Zhou, X. Zihlmann, B. The GlueX Collaboration

Abstract

We report on the measurement of the beam asymmetry ς for the reactions γ - p→pη and γ - p→pη′ from the GlueX experiment using an 8.2-8.8-GeV linearly polarized tagged photon beam incident on a liquid hydrogen target in Hall D at Jefferson Laboratory. These measurements are made as a function of momentum transfer -t with significantly higher statistical precision than our earlier η measurements and are the first measurements of η′ in this energy range. We compare the results to theoretical predictions based on t-channel quasiparticle exchange. We also compare the ratio of ςη to ςη′ to these models as this ratio is predicted to be sensitive to the amount of ss exchange in the production. We find that photoproduction of both η and η′ is dominated by natural parity exchange with little dependence on -t. © 2019 American Physical Society.

Published
2019

2. Construction and performance of the barrel electromagnetic calorimeter for the GlueX experiment

Author

Beattie, T.D. Foda, A.M. Henschel, C.L. Katsaganis, S. Krueger, S.T. Lolos, G.J. Papandreou, Z. Plummer, E.L. Semenova, I.A. Semenov, A.Y. Barbosa, F. Chudakov, E. Dalton, M.M. Lawrence, D. Qiang, Y. Sandoval, N. Smith, E.S. Stanislav, C. Stevens, J.R. Taylor, S. Whitlatch, T. Zihlmann, B. Levine, W. McGinley, W. Meyer, C.A. Staib, M.J. Anassontzis, E. Kourkoumelis, C. Vasileiadis, G. Voulgaris, G. Brooks, W.K. Hakobyan, H. Kuleshov, S. Rojas, R. Romero, C. Soto, O. Toro, A. Vega, I. Shepherd, M.R.

Subjects
Physics::Instrumentation and Detectors, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The barrel calorimeter is part of the new spectrometer installed in Hall D at Jefferson Lab for the GlueX experiment. The calorimeter was installed in 2013, commissioned in 2014 and has been operating routinely since early 2015. The detector configuration, associated Monte Carlo simulations, calibration and operational performance are described herein. The calorimeter records the time and energy deposited by charged and neutral particles created by a multi-GeV photon beam. It is constructed as a lead and scintillating-fiber calorimeter and read out with 3840 large-area silicon photomultiplier arrays. Particles impinge on the detector over a wide range of angles, from normal incidence at 90 degrees down to 11.5 degrees, which defines a geometry that is fairly unique among calorimeters. The response of the calorimeter has been measured during a running experiment and performs as expected for electromagnetic showers below 2.5 GeV. We characterize the performance of the BCAL using the energy resolution integrated over typical angular distributions for π0 and η production of σE∕E=5.2%∕E(GeV)⊕3.6% and a timing resolution of σ=150 ps at 1 GeV. © 2018

Published
2018

3. Measurement of the beam asymmetry Σ for π0 and η photoproduction on the proton at Eγ=9 GeV

Author

Al Ghoul, H. Anassontzis, E.G. Austregesilo, A. Barbosa, F. Barnes, A. Beattie, T.D. Bennett, D.W. Berdnikov, V.V. Black, T. Boeglin, W. Briscoe, W.J. Brooks, W.K. Cannon, B.E. Chernyshov, O. Chudakov, E. Crede, V. Dalton, M.M. Deur, A. Dobbs, S. Dolgolenko, A. Dugger, M. Dzhygadlo, R. Egiyan, H. Eugenio, P. Fanelli, C. Foda, A.M. Frye, J. Furletov, S. Gan, L. Gasparian, A. Gerasimov, A. Gevorgyan, N. Goetzen, K. Goryachev, V.S. Guo, L. Hakobyan, H. Hardin, J. Henderson, A. Huber, G.M. Ireland, D.G. Ito, M.M. Jarvis, N.S. Jones, R.T. Kakoyan, V. Kamel, M. Klein, F.J. Kliemt, R. Kourkoumeli, C. Kuleshov, S. Kuznetsov, I. Lara, M. Larin, I. Lawrence, D. Levine, W.I. Livingston, K. Lolos, G.J. Lyubovitskij, V. Mack, D. Mattione, P.T. Matveev, V. McCaughan, M. McCracken, M. McGinley, W. McIntyre, J. Mendez, R. Meyer, C.A. Miskimen, R. Mitchell, R.E. Mokaya, F. Moriya, K. Nerling, F. Nigmatkulov, G. Ochoa, N. Ostrovidov, A.I. Papandreou, Z. Patsyuk, M. Pedroni, R. Pennington, M.R. Pentchev, L. Peters, K.J. Pooser, E. Pratt, B. Qiang, Y. Reinhold, J. Ritchie, B.G. Robison, L. Romanov, D. Salgado, C. Schumacher, R.A. Schwarz, C. Schwiening, J. Semenov, A.Y. Semenova, I.A. Seth, K.K. Shepherd, M.R. Smith, E.S. Sober, D.I. Somov, A. Somov, S. Soto, O. Sparks, N. Staib, M.J. Stevens, J.R. Strakovsky, I.I. Subedi, A. Tarasov, V. Taylor, S. Teymurazyan, A. Tolstukhin, I. Tomaradze, A. Toro, A. Tsaris, A. Vasileiadis, G. Vega, I. Walford, N.K. Werthmüller, D. Whitlatch, T. Williams, M. Wolin, E. Xiao, T. Zarling, J. Zhang, Z. Zihlmann, B. Mathieu, V. Nys, J. GlueX Collaboration

Subjects
Nuclear Experiment
Abstract

We report measurements of the photon beam asymmetry Σ for the reactions γ - p→pπ0 and γ - p→pη from the GlueX experiment using a 9 GeV linearly polarized, tagged photon beam incident on a liquid hydrogen target in Jefferson Lab's Hall D. The asymmetries, measured as a function of the proton momentum transfer, possess greater precision than previous π0 measurements and are the first η measurements in this energy regime. The results are compared with theoretical predictions based on t-channel, quasiparticle exchange and constrain the axial-vector component of the neutral meson production mechanism in these models. © 2017 American Physical Society.

Published
2017

4. Correlations and fluctuations in Pb+Pb collisons

Author

Seyboth, P. Bächler, J. Barna, D. Barnby, L.S. Bartke, J. Barton, R.A. Betev, L. Bialkowska, H. Billmeier, A. Blume, C. Blyth, C.O. Boimska, B. Bracinik, J. Brady, F.P. Brun, R. Bunčić, P. Carr, L. Cebra, D. Cooper, G.E. Cramer, J.G. Csató, P. Eckardt, V. Eckhardt, F. Ferenc, D. Fischer, H.G. Fodor, Z. Foka, P. Freund, P. Friese, V. Ftacnik, J. Gál, J. Ganz, R. Gaździcki, M. Gladysz, E. Grebieszkow, J. Harris, J.W. Hegyi, S. Hlinka, V. Höhne, C. Igo, G. Ivanov, M. Jacobs, P. Janik, R. Jones, P.G. Kadija, K. Kolesnikov, V.I. Kowalski, M. Lasiuk, B. Lednicky, R. Lévai, P. Malakhov, A.I. Margetis, S. Markert, C. Mayes, B.W. Melkumov, G.L. Molnár, J. Nelson, J.M. Odyniec, G. Oldenburg, M.D. Pálla, G. Panagiotou, A.D. Petridis, A. Pikna, M. Pinsky, L. Poskanzer, A.M. Prindle, D.J. Pühlhofer, F. Reid, J.G. Renfordt, R. Retyk, W. Ritter, H.G. Röhrich, D. Roland, C. Roland, G. Rybicki, A. Sammer, T. Sandoval, A. Sann, H. Semenov, A.Y. Schäfer, E. Schmitz, N. Seyboth, P. Siklér, F. Sitar, B. Skrzypczak, E. Snellings, R. Squier, G.T.A. Stock, R. Strmen, P. Ströbele, H. Susa, T. Szarka, I. Szentpétery, I. Sziklai, J. Toy, M. Trainor, T.A. Trentalange, S. Ullrich, T. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Voloshin, S. Vranić, D. Wang, F. Weerasundara, D.D. Wenig, S. Whitten, C. Xu, N. Yates, T.A. Yoo, I.K. Zimányi, J.

Abstract

Results on two-particle correlations, deuteron production, event anisotropy and event-by-event fluctuations of 〈pT〉 and K/π were obtained by the NA49 experiment in Pb+Pb collisions at 158 A·GeV beam energy. The interpretation of the measurements is discussed in light of the search for deconfinement. © 2001 Elsevier Science B.V. All rights reserved.

Published
2001

5. Centrality dependence of directed and elliptic flow at the SPS

Author

Poskanzer, A.M. Voloshin, S.A. for the NA49 Collaboration Bächler, J. Barna, D. Barnby, L.S. Bartke, J. Barton, R.A. Betev, L. Biał-kowska, H. Billmeier, A. Blume, C. Blyth, C.O. Boimska, B. Bracinik, J. Brady, F.P. Brockmann, R. Brun, R. Bunčić, P. Bunčić, P. Carr, L. Cebra, D. Cooper, G.E. Cramer, J.G. Csató, P. Eckardt, V. Eckhardt, F. Ferenc, D. Fischer, H.G. Fodor, Z. Foka, P. Freund, P. Friese, V. Ftacnik, J. Gál, J. Ganz, R. Gaździcki, M. Gładysz, E. Grebieszkow, J. Harris, J.W. Hegyi, S. Hlinka, V. Höhne, C. Igo, G. Ivanov, M. Jacobs, P. Janik, R. Jones, P.G. Kadija, K. Kadija, K. Kolesnikov, V.I. Kowalski, M. Lasiuk, B. Lévai, P. Malakhov, A.I. Margetis, S. Markert, C. Mayes, B.W. Melkumov, G.L. Molnár, J. Nelson, J.M. Odyniec, G. Oldenburg, M.D. Pálla, G. Panagiotou, A.D. Petridis, A. Pikna, M. Pinsky, L. Poskanzer, A.M. Prindle, D.J. Pühlhofer, F. Reid, J.G. Renfordt, R. Retyk, W. Ritter, H.G. Röhrich, D. Roland, C. Roland, G. Rybicki, A. Sammer, T. Sandoval, A. Sann, H. Semenov, A.Y. Schäfer, E. Schmitz, N. Seyboth, P. Siklér, F. Siklér, F. Sitar, B. Skrzypczak, E. Snellings, R. Squier, G.T.A. Stock, R. Strmen, P. Ströbele, H. Susa, T. Szarka, I. Szentpétery, I. Sziklai, J. Toy, M. Toy, M. Trainor, T.A. Trentalange, S. Ullrich, T. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Voloshin, S. Vranić, D. Vranić, D. Wang, F. Weerasundara, D.D. Wenig, S. Whitten, C. Xu, N. Yates, T.A. Yoo, I.K. Zimányi, J.

Subjects
Nuclear Experiment
Abstract

New data with a minimum bias trigger for 158 GeV/nucleon Pb + Pb have been analyzed. Directed and elliptic flow as a function of rapidity of the particles and centrality of the collision are presented. The centrality dependence of the ratio of elliptic flow to the initial space elliptic anisotropy is compared to models.

Published
1999

6. Strangeness measurements in NA49 experiment with Pb projectiles

Author

Margetis, S. Appelshäuser, H. Bächler, J. Bailey, S.J. Barna, D. Barnby, L.S. Bartke, J. Barton, R.A. Bialkowska, H. Billmeier, A. Blyth, C.O. Bock, R. Bormann, C. Brady, F.P. Brockmann, R. Brun, R. Buncic, P. Caines, H.L. Carr, L.D. Cebra, D. Cooper, G.E. Cramer, J.G. Cristinziani, M. Csato, P. Dunn, J. Eckardt, V. Eckhardt, F. Ferguson, M.I. Fischer, H.G. Flierl, D. Fodor, Z. Foka, P. Friese, V. Fuchs, M. Gabler, F. Gal, J. Gazdzicki, M. Gladysz, E. Grebieszkow, J. Günther, J. Harris, J.W. Hegyi, S. Henkel, T. Hill, L.A. Hümmler, H. Irmscher, D. Jacobs, P. Jones, P.G. Kadija, K. Kolesnikov, V.I. Kowalski, M. Lasiuk, B. Lévai, P. Malakhov, A.I. Markert, C. Melkumov, G.L. Mock, A. Molnár, J. Nelson, J.M. Oldenburg, M. Odyniec, G. Palla, G. Panagiotou, A.D. Petridis, A. Piper, A. Porter, R.J. Poskanzer, A.M. Prindle, D.J. Pühlhofer, F. Rauch, W. Reid, J.G. Renfordt, R. Retyk, W. Ritter, H.G. Röhrich, D. Roland, C. Roland, G. Rudolph, H. Rybicki, A. Sandoval, A. Sann, H. Semenov, A.Y. Schäfer, E. Schmischke, D. Schmitz, N. Schönfelder, S. Seyboth, P. Seyerlein, J. Sikler, F. Skrzypczak, E. Snellings, R. Squier, G.T.A. Stock, R. Ströbele, H. Struck, C. Szentpetery, I. Sziklai, J. Trainor, T.A. Trentalange, S. Ullrich, T. Vassiliou, M. Veres, G. Vesztergombi, G. Vranic, D. Wang, F. Weerasundara, D.D. Wenig, S. Whitten, C. Wienold, T. Wood, L. Xu, N. Yates, T.A. Zimanyi, J. Zybert, R.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Strangeness measurements in NA49 indicate a strangeness enhancement in Pb + Pb interactions, relative to the elementary nucleon-nucleon and nucleon-nucleus collisions. It appears that the magnitude of the enhancement is similar in Pb + Pb and S + nucleus collisions. The enhancement is present in almost every central Pb + Pb collision, the dynamical fluctuations (in strangeness) appear to be minimal. The magnitude of the enhancement increases with the strangeness content of the particle species. The inverse slope systematics indicate the presence of transverse flow in the system. The cascade/lambda ratio is increased relative to elementary collisions.

Published
1999

Catalog

Books, media, physical & digital resources
See catalog results