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Experimental access to Transition Distribution Amplitudes with the PANDA experiment at FAIR

Singh, B. P.; Erni, W.; Keshelashvili, I.; Krusche, B.; Steinacher, M.; Liu, B.; Liu, H.; Liu, Z.; Shen, X. and Wang, C., et al. (2015) In European Physical Journal A. Hadrons and Nuclei 51(8).
Abstract
Baryon-to-meson Transition Distribution Amplitudes (TDAs) encoding valuable new information on hadron structure appear as building blocks in the collinear factorized description for several types of hard exclusive reactions. In this paper, we address the possibility of accessing nucleon-to-pion (pi N) TDAs from (p) over barp -> e(+)e(-)pi(0) reaction with the future PANDA detector at the FAIR facility. At high center-of-mass energy and high invariant mass squared of the lepton pair q(2), the amplitude of the signal channel (p) over barp -> e(+)e(-)pi(0) admits a QCD factorized description in terms of pi N TDAs and nucleon Distribution Amplitudes (DAs) in the forward aid backward kinematic regimes. Assuming the validity of this... (More)
Baryon-to-meson Transition Distribution Amplitudes (TDAs) encoding valuable new information on hadron structure appear as building blocks in the collinear factorized description for several types of hard exclusive reactions. In this paper, we address the possibility of accessing nucleon-to-pion (pi N) TDAs from (p) over barp -> e(+)e(-)pi(0) reaction with the future PANDA detector at the FAIR facility. At high center-of-mass energy and high invariant mass squared of the lepton pair q(2), the amplitude of the signal channel (p) over barp -> e(+)e(-)pi(0) admits a QCD factorized description in terms of pi N TDAs and nucleon Distribution Amplitudes (DAs) in the forward aid backward kinematic regimes. Assuming the validity of this factorized description, we perform feasibility studies for measuring (p) over barp -> e(+)e(-)pi(0) with the PANDA detector. Detailed simulations on signal reconstruction efficiency as well as on rejection of the most severe background channel, i.e. (p) over barp -> pi(+)pi(-)pi(0) were performed for the center-of-mass energy squared s = 5 GeV2 and s = 10 GeV2, in the kinematic regions 3.0 < q(2) < 4.3 GeV2 and 5 < q(2) < 9 GeV2, respectively, with a neutral pion scattered in the forward or backward cone vertical bar cos theta(pi 0)vertical bar > 0.5 in the proton-antiproton center-of-mass frame. Results of the simulation show that the particle identification capabilities of the PANDA detector will allow to achieve a background rejection factor of 5 . 10(7) (1 . 10(7)) at low (high) q(2) for s = 5 GeV2, and of 1 . 10(8) (6 . 10(6)) at low (high) q(2) for s = 10 GeV2, while keeping the signal reconstruction efficiency at around 40%. At both energies, a clean lepton signal can be reconstructed with the expected statistics corresponding to 2 of integrated luminosity. The cross sections obtained from the simulations are used to show that a test of QCD collinear factorization can be done at the lowest order by measuring scaling laws and angular distributions. The future measurement of the signal channel cross section with PANDA will provide a new test of the perturbative QCD description of a novel class of hard exclusive reactions and will open the possibility of experimentally accessing pi N TDAs. (Less)
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European Physical Journal A. Hadrons and Nuclei
volume
51
issue
8
publisher
Springer
external identifiers
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  • scopus:84940490717
ISSN
1434-6001
DOI
10.1140/epja/i2015-15107-y
language
English
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2015-09-22 14:11:30
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@article{7bcccb64-b500-4d74-ae77-ce825dd6d397,
  abstract     = {Baryon-to-meson Transition Distribution Amplitudes (TDAs) encoding valuable new information on hadron structure appear as building blocks in the collinear factorized description for several types of hard exclusive reactions. In this paper, we address the possibility of accessing nucleon-to-pion (pi N) TDAs from (p) over barp -&gt; e(+)e(-)pi(0) reaction with the future PANDA detector at the FAIR facility. At high center-of-mass energy and high invariant mass squared of the lepton pair q(2), the amplitude of the signal channel (p) over barp -&gt; e(+)e(-)pi(0) admits a QCD factorized description in terms of pi N TDAs and nucleon Distribution Amplitudes (DAs) in the forward aid backward kinematic regimes. Assuming the validity of this factorized description, we perform feasibility studies for measuring (p) over barp -&gt; e(+)e(-)pi(0) with the PANDA detector. Detailed simulations on signal reconstruction efficiency as well as on rejection of the most severe background channel, i.e. (p) over barp -&gt; pi(+)pi(-)pi(0) were performed for the center-of-mass energy squared s = 5 GeV2 and s = 10 GeV2, in the kinematic regions 3.0 &lt; q(2) &lt; 4.3 GeV2 and 5 &lt; q(2) &lt; 9 GeV2, respectively, with a neutral pion scattered in the forward or backward cone vertical bar cos theta(pi 0)vertical bar &gt; 0.5 in the proton-antiproton center-of-mass frame. Results of the simulation show that the particle identification capabilities of the PANDA detector will allow to achieve a background rejection factor of 5 . 10(7) (1 . 10(7)) at low (high) q(2) for s = 5 GeV2, and of 1 . 10(8) (6 . 10(6)) at low (high) q(2) for s = 10 GeV2, while keeping the signal reconstruction efficiency at around 40%. At both energies, a clean lepton signal can be reconstructed with the expected statistics corresponding to 2 of integrated luminosity. The cross sections obtained from the simulations are used to show that a test of QCD collinear factorization can be done at the lowest order by measuring scaling laws and angular distributions. The future measurement of the signal channel cross section with PANDA will provide a new test of the perturbative QCD description of a novel class of hard exclusive reactions and will open the possibility of experimentally accessing pi N TDAs.},
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  author       = {Singh, B. P. and Erni, W. and Keshelashvili, I. and Krusche, B. and Steinacher, M. and Liu, B. and Liu, H. and Liu, Z. and Shen, X. and Wang, C. and Zhao, J. and Albrecht, M. and Fink, M. and Heinsius, F. H. and Held, T. and Holtmann, T. and Koch, H. and Kopf, B. and Kuemmel, M. and Kuhl, G. and Kuhlmann, M. and Leyhe, M. and Mikirtychyants, M. and Musiol, P. and Mustafa, A. and Pelizaeus, M. and Pychy, J. and Richter, M. and Schnier, C. and Schroeder, T. and Sowa, C. and Steinke, M. and Triffterer, T. and Wiedner, U. and Beck, R. and Hammann, C. and Kaiser, D. and Ketzer, B. and Kube, M. and Mahlberg, P. and Rossbach, M. and Schmidt, C. and Schmitz, R. and Thoma, U. and Walther, D. and Wendel, C. and Wilson, A. and Bianconi, A. and Bragadireanu, M. and Caprini, M. and Pantea, D. and Pietreanu, D. and Vasile, M. 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Morales and Espi, M. C. Mora and Nerling, F. and Orth, H. and Peters, K. and Pineiro, D. Rodriguez and Saito, N. and Saito, T. and Lorente, A. Sanchez and Schmidt, C. J. and Schwarz, C. and Schwiening, J. and Traxler, M. and Valente, R. and Voss, B. and Wieczorek, P. and Wilms, A. and Zuhlsdorf, M. and Abazov, V. M. and Alexeev, G. and Arefiev, A. and Astakhov, V. I. and Barabanov, M. Yu. and Batyunya, B. V. and Davydov, Yu. I. and Dodokhov, V. Kh. and Efremov, A. A. and Fedunov, A. G. and Festchenko, A. A. and Galoyan, A. S. and Grigoryan, S. and Karmokov, A. and Koshurnikov, E. K. and Lobanov, V. I. and Lobanov, Yu. Yu. and Makarov, A. F. and Malinina, L. V. and Malyshev, V. L. and Mustafaev, G. A. and Olshevskiy, A. and Pasyuk, M. A. and Perevalova, E. A. and Piskun, A. A. and Pocheptsov, T. A. and Pontecorvo, G. and Rodionov, V. K. and Rogov, Yu. N. and Salmin, R. A. and Samartsev, A. G. and Sapozhnikov, M. G. and Shabratova, G. S. and Skachkov, N. B. and Skachkova, A. N. and Strokovsky, E. A. and Suleimanov, M. K. and Teshev, R. Sh. and Tokmenin, V. V. and Uzhinsky, V. V. and Vodopyanov, A. S. and Zaporozhets, S. A. and Zhuravlev, N. I. and Zorin, A. G. and Branford, D. and Glazier, D. and Watts, D. and Woods, P. and Britting, A. and Eyrich, W. and Lehmann, A. and Uhlig, F. and Dobbs, S. and Seth, K. and Tomaradze, A. and Xiao, T. and Bettoni, D. and Carassiti, V. and Ramusino, A. Cotta and Dalpiaz, P. and Drago, A. and Fioravanti, E. and Garzia, I. and Savrie, M. and Stancari, G. and Akishina, V. and Kisel, I. and Kulakov, I. and Zyzak, M. and Arora, R. and Bel, T. and Gromliuk, A. and Kalicy, G. and Krebs, M. and Patsyuk, M. and Zuehlsdorf, M. and Bianchi, N. and Gianotti, P. and Guaraldo, C. and Lucherini, V. and Pace, E. and Bersani, A. and Bracco, G. and Macri, M. and Parodi, R. F. and Bianco, S. and Bremer, D. and Brinkmann, K. 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K. and Godre, S. S. and Duchat, R. and Amoroso, A. and Bussa, M. P. and Busso, L. and De Mori, F. and Destefanis, M. and Fava, L. and Ferrero, L. and Greco, M. and Maggiora, M. and Maniscalco, G. and Marcello, S. and Sosio, S. and Spataro, S. and Zotti, L. and Calvo, D. and Coli, S. and De Remigis, P. and Filippi, A. and Giraudo, G. and Lusso, S. and Mazza, G. and Mingnore, M. and Rivetti, A. and Wheadon, R. and Balestra, F. and Iazzi, F. and Introzzi, R. and Lavagno, A. and Younis, H. and Birsa, R. and Bradamante, F. and Bressan, A. and Martin, A. and Clement, H. and Galnander, B. and Balkestahl, L. Caldeira and Calen, H. and Fransson, K. and Johansson, T. and Kupsc, A. and Marciniewski, P. and Pettersson, J. and Schonning, K. and Wolke, M. and Zlomanczuk, J. and Diaz, J. and Ortiz, A. and Vinodkumar, P. C. and Parmar, A. and Chlopik, A. and Melnychuk, D. and Slowinski, B. and Trzcinski, A. and Wojciechowski, M. and Wronka, S. and Zwieglinski, B. and Buhler, P. and Marton, J. and Suzuki, K. and Widmann, E. and Zmeskal, J. and Froehlich, B. and Khaneft, D. and Lin, D. and Zimmermann, I. and Semenov-Tian-Shansky, K.},
  issn         = {1434-6001},
  language     = {eng},
  number       = {8},
  publisher    = {Springer},
  series       = {European Physical Journal A. Hadrons and Nuclei},
  title        = {Experimental access to Transition Distribution Amplitudes with the PANDA experiment at FAIR},
  url          = {http://dx.doi.org/10.1140/epja/i2015-15107-y},
  volume       = {51},
  year         = {2015},
}