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

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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A. and Atomssa, E. and Hennino, T. and Imre, M. and Kunne, R. and Le Galliard, C. and Ma, B. and Marchand, D. and Ong, S. and Ramstein, B. and Rosier, P. and Tomasi-Gustafsson, E. and Van De Wiele, J. and Boca, G. and Costanza, S. and Genova, P. and Lavezzi, L. and Montagna, P. and Rotondi, A. and Abramov, V. and Belikov, N. and Bukreeva, S. and Davidenko, A. and Derevschikov, A. and Goncharenko, Y. and Grishin, V. and Kachanov, V. and Kormilitsin, V. and Melnik, Y. and Levin, A. and Minaev, N. and Mochalov, V. and Morozov, D. and Nogach, L. and Poslavskiy, S. and Ryazantsev, A. and Ryzhikov, S. and Semenov, P. and Shein, I. and Uzunian, A. and Vasiliev, A. and Yakutin, A. and Yabsley, B. and Back, T. and Cederwall, B. and Makonyi, K. and Tegner, P. E. and von Wurtemberg, K. M. and Belostotski, S. and Gavrilov, G. and Izotov, A. and Kashchuk, A. and Levitskaya, O. and Manaenkov, S. and Miklukho, O. and Naryshkin, Y. and Suvorov, K. and Veretennikov, D. and Zhadanov, A. and Rai, A. 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.. (2015) Experimental access to Transition Distribution Amplitudes with the PANDA experiment at FAIR. The European physical journal A, 51 (8). p. 107.

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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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:30 Jun 2016 11:01
Deposited On:09 May 2016 09:20

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