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 informa-
tion 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 p ̄ p → 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 q 2 , the amplitude of the signal channel
p ̄ p → e+ e−π0 admits a QCD factorized description in terms of πN TDAs and nucleon Distribution Am-
plitudes (DAs) in the forward and backward kinematic regimes. Assuming the validity of this factorized
description, we perform feasibility studies for measuring p ̄ p → 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. p ̄ p → π+π− π 0 were performed for the center-of-mass energy squared s = 5 GeV 2 and s = 10 GeV2 , in
the kinematic regions 3.0 < q2 < 4.3 GeV2 and 5 < q 2 < 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. Results
of the simulation show that the particle identification capabilities of the PANDA
̄
detector will allow to
achieve a background rejection factor of 5 · 107 (1 · 107 ) at low (high) q 2 for s = 5 GeV 2, and of 1 · 108
(6 · 106) at low (high) q2 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 fb−1 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 πN TDAs.
tion 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 p ̄ p → 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 q 2 , the amplitude of the signal channel
p ̄ p → e+ e−π0 admits a QCD factorized description in terms of πN TDAs and nucleon Distribution Am-
plitudes (DAs) in the forward and backward kinematic regimes. Assuming the validity of this factorized
description, we perform feasibility studies for measuring p ̄ p → 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. p ̄ p → π+π− π 0 were performed for the center-of-mass energy squared s = 5 GeV 2 and s = 10 GeV2 , in
the kinematic regions 3.0 < q2 < 4.3 GeV2 and 5 < q 2 < 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. Results
of the simulation show that the particle identification capabilities of the PANDA
̄
detector will allow to
achieve a background rejection factor of 5 · 107 (1 · 107 ) at low (high) q 2 for s = 5 GeV 2, and of 1 · 108
(6 · 106) at low (high) q2 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 fb−1 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 πN TDAs.
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, Andrea; 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.;
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