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HK: Physik der Hadronen und Kerne
HK 2: Theory I
HK 2.1: Group Report
Monday, March 11, 2002, 16:15–16:45, A
New soft pion theorems for hard reactions — •M.V. Polyakov1,2, P.V. Pobylitsa1,2, and M.I. Strikman1,3 — 1Petersburg Nuclear Physics Institute, 188350 Gatchina, Russia — 2Institute for Theoretical Physics II, Ruhr University Bochum, 44780 Bochum, Germany — 3Pennsylvania State University, University Park, PA16802,USA
We prove a new soft pion theorem for the near threshold pion production by a hard electromagnetic probe. This theorem relates various near threshold pion production amplitudes to the nucleon form factors at large momentum transfer. The new soft pion theorem exploits the kinematic domain Q2 ≫ Λ3/mπ (Λ∼ 1 GeV is a typical hadronic scale, Q2 is a virtuality of the incident photon).
The new soft pion theorem is in a good agreement with the SLAC data for the structure function F2p(W,Q2) for W2≤ 1.4 GeV2 and 9≤ Q2≤ 30.7 GeV2.