Experimental access to Transition Distribution Amplitudes with the P̄ANDA experiment at FAIR
Articolo
Data di Pubblicazione:
2015
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 (πN)
TDAs from ¯pp → e+e−π0 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 q2, the amplitude of the signal channel
pp¯ → e+e−π0 admits a QCD factorized description in terms of πN TDAs and nucleon Distribution Amplitudes
(DAs) in the forward and backward kinematic regimes. Assuming the validity of this factorized
description, we perform feasibility studies for measuring ¯pp → e+e−π0 with the PANDA detector. Detailed ¯
simulations on signal reconstruction efficiency as well as on rejection of the most severe background channel,
i.e. pp¯ → π+π−π0 were performed for the center-of-mass energy squared s = 5 GeV2 and s = 10 GeV2, in
the kinematic regions 3.0 < q2 < 4.3 GeV2 and 5 < q2 < 9 GeV2, respectively, with a neutral pion scattered
in the forward or backward cone | cos θπ0 | > 0.5 in the proton-antiproton center-of-mass frame
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 (πN)
TDAs from ¯pp → e+e−π0 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 q2, the amplitude of the signal channel
pp¯ → e+e−π0 admits a QCD factorized description in terms of πN TDAs and nucleon Distribution Amplitudes
(DAs) in the forward and backward kinematic regimes. Assuming the validity of this factorized
description, we perform feasibility studies for measuring ¯pp → e+e−π0 with the PANDA detector. Detailed ¯
simulations on signal reconstruction efficiency as well as on rejection of the most severe background channel,
i.e. pp¯ → π+π−π0 were performed for the center-of-mass energy squared s = 5 GeV2 and s = 10 GeV2, in
the kinematic regions 3.0 < q2 < 4.3 GeV2 and 5 < q2 < 9 GeV2, respectively, with a neutral pion scattered
in the forward or backward cone | cos θπ0 | > 0.5 in the proton-antiproton center-of-mass frame
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
Nuclear and High Energy Physics
Elenco autori:
The PANDA Collaboration, Null; Singh, B. P; Erni, W.; Keshelashvili, I.; Krusche, B.; Steinacher, M.; Liu, B.; Liu, H.; Liu, Z.; Shen, X.; Wang, C.; Zhao, J.; Albrecht, M.; Fink, M.; Heinsius, F. H.; Held, T.; Holtmann, T.; Koch, H.; Kopf, B.; Kümmel, M.; Kuhl, G.; Kuhlmann, M.; Leyhe, M.; Mikirtychyants, M.; Musiol, P.; Mustafa, A.; Pelizäus, M.; Pychy, J.; Richter, M.; Schnier, C.; Schröder, T.; Sowa, C.; Steinke, M.; Triffterer, T.; Wiedner, U.; Beck, R.; Hammann, C.; Kaiser, D.; Ketzer, B.; Kube, M.; Mahlberg, P.; Rossbach, M.; Schmidt, C.; Schmitz, R.; Thoma, U.; Walther, D.; Wendel, C.; Wilson, A.; Bianconi, A.; Bragadireanu, M.; Caprini, M.; Pantea, D.; Pietreanu, D.; Vasile, M. E.; Patel, B.; Kaplan, D.; Brandys, P.; Czyzewski, T.; Czyzycki, W.; Domagala, M.; Hawryluk, M.; Filo, G.; Krawczyk, M.; Kwiatkowski, D.; Lisowski, E.; Lisowski, F.; Fiutowski, T.; Idzik, M.; Mindur, B.; Przyborowski, D.; Swientek, K.; Czech, B.; Kliczewski, S.; Korcyl, K.; Kozela, A.; Kulessa, P.; Lebiedowicz, P.; Malgorzata, K.; Pysz, K.; Schäfer, W.; Siudak, R.; Szczurek, A.; Biernat, J.; Jowzaee, S.; Kamys, B.; Kistryn, S.; Korcyl, G.; Krzemien, W.; Magiera, A.; Moskal, P.; Palka, M.; Psyzniak, A.; Rudy, Z.; Salabura, P.; Smyrski, J.; Strzempek, P.; Wrońska, A.; Augustin, I.; Lehmann, I.; Nicmorus, D.; Schepers, G.; Schmitt, L.; Al Turany, M.; Cahit, U.; Capozza, L.; Dbeyssi, A.; Deppe, H.; Dzhygadlo, R.; Ehret, A.; Flemming, H.; Gerhardt, A.; Götzen, K.; Karabowicz, R.; Kliemt, R.; Kunkel, J.; Kurilla, U.; Lehmann, D.; Lühning, J.; Maas, F.; Morales Morales, C.; Mora Espí, M. C.; Nerling, F.; Orth, H.; Peters, K.; Rodríguez Piñeiro, D.; Saito, N.; Saito, T.; Sánchez Lorente, A.; Schmidt, C. J.; Schwarz, C.; Schwiening, J.; Traxler, M.; Valente, R.; Voss, B.; Wieczorek, P.; Wilms, A.; Zühlsdorf, M.; Abazov, V. M.; Alexeev, G.; Arefiev, A.; Astakhov, V. I.; Barabanov, M. Y. u.; Batyunya, B. V.; Davydov, Y. u. I.; Dodokhov, V. K. h.; Efremov, A. A.; Fedunov, A. G.; Festchenko, A. A.; Galoyan, A. S.; Grigoryan, S.; Karmokov, A.; Koshurnikov, E. K.; Lobanov, V. I.; Lobanov, Y. u. Y. u.; Makarov, A. F.; Malinina, L. V.; Malyshev, V. L.; Mustafaev, G. A.; Olshevskiy, A.; Pasyuk, M. A.; Perevalova, E. A.; Piskun, A. A.; Pocheptsov, T. A.; Pontecorvo, G.; Rodionov, V. K.; Rogov, Y. u. N.; Salmin, R. A.; Samartsev, A. G.; Sapozhnikov, M. G.; Shabratova, G. S.; Skachkov, N. B.; Skachkova, A. N.; Strokovsky, E. A.; Suleimanov, M. K.; Teshev, R. S. h.; Tokmenin, V. V.; Uzhinsky, V. V.; Vodopyanov, A. S.; Zaporozhets, S. A.; Zhuravlev, N. I.; Zorin, A. G.; Branford, D.; Glazier, D.; Watts, D.; Woods, P.; Britting, A.; Eyrich, W.; Lehmann, A.; Uhlig, F.; Dobbs, S.; Seth, K.; Tomaradze, A.; Xiao, T.; Bettoni, D.; Carassiti, V.; Cotta Ramusino, A.; Dalpiaz, P.; Drago, A.; Fioravanti, E.; Garzia, I.; Savriè, M.; Stancari, G.; Akishina, V.; Kisel, I.; Kulakov, I.; Zyzak, M.; Arora, R.; Bel, T.; Gromliuk, A.; Kalicy, G.; Krebs, M.; Patsyuk, M.; Zuehlsdorf, M.; Bianchi, N.; Gianotti, P.; Guaraldo, C.; Lucherini, V.; Pace, E.; Bersani, A.; Bracco, G.; Macri, M.; Parodi, R. F.; Bianco, S.; Bremer, D.; Brinkmann, K. T.; Diehl, S.; Dormenev, V.; Drexler, P.; Düren, M.; Eissner, T.; Etzelmüller, E.; Föhl, K.; Galuska, M.; Gessler, T.; Gutz, E.; Hayrapetyan, A.; Hu, J.; Kröck, B.; Kühn, W.; Kuske, T.; Lange, S.; Liang, Y.; Merle, O.; Metag, V.; Mülhheim, D.; Münchow, D.; Nanova, M.; Novotny, R.; Pitka, A.; Quagli, T.; Rieke, J.; Rosenbaum, C.; Schnell, R.; Spruck, B.; Stenzel, H.; Thöring, U.; Ullrich, M.; Wasem, T.; Werner, M.; Zaunick, H. G.; Ireland, D.; Rosner, G.; Seitz, B.; Deepak, P. N.; Kulkarni, A. V.; Apostolou, A.; Babai, M.; Kavatsyuk, M.; Lemmens, P.; Lindemulder, M.; Löhner, H.; Messchendorp, J.; Schakel, P.; Smit, H.; van der Weele, J. C.; Tiemens, M.; Veenstra, R.; Vejdani, S.; Kalita, K.; Mohanta, D. P.; Kumar, A.; Roy, A.; Sahoo, R.; Sohlbach, H.; Büscher, M.; Cao, L.; Cebulla, A.; Deermann, D.; Dosd
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