Frankfurt 2014 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 37: Hadronenstruktur und -spektroskopie
HK 37.7: Talk
Thursday, March 20, 2014, 15:30–15:45, HZ 1+2
Accessing Transition Distribution Amplitudes with the PANDA experiment at FAIR — •Manuel Zambrana, Maria del Carmen Mora, and Frank Maas — Institut für Kernphysik, Johannes Gutenberg Universität, Mainz, Germany
The possibility of accessing the proton to pion Transition Distribution Amplitudes with the future PANDA detector at the FAIR facility is investigated. At high center of mass energy and four-momentum transfer, the amplitude of signal channel pp → e+e−π0 admits a QCD factorized description in terms of Distribution Amplitudes and Transition Distribution Amplitudes in the forward and backward regions. Feasibility studies of measuring pp → e+e−π0 with the PANDA detector have been performed at the center of mass energy squared s = 5 GeV2 and s=10 GeV2, in the kinematic region of four-momentum transfer 3.8 < q2 < 4.2 GeV2 and 7 < q2 < 8 GeV2, respectively. These include detailed simulations on signal reconstruction efficiency as well as on rejection of the most severe background channel, i.e. pp → π+π−π0. Simulations show that the particle identification capabilities of the PANDA detector will allow to achieve a background rejection factor larger than 108 while keeping the signal reconstruction efficiency at the level of 40%, and that a clean lepton signal can be reconstructed with a data sample corresponding to 2 fb−1 of integrated luminosity. The future measurement of the signal channel cross section with PANDA will provide a test of QCD factorization and opens the possibility of accessing the proton to pion Transition Distribution Amplitudes.