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HK: Physik der Hadronen und Kerne

HK 2: Theory I

HK 2.1: Gruppenbericht

Montag, 11. März 2002, 16:15–16:45, A

New soft pion theorems for hard reactions — •M.V. Polyakov^1,2, P.V. Pobylitsa^1,2, and M.I. Strikman^1,3 — 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/m_π (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 F₂^p(W,Q²) for W²≤ 1.4 GeV² and 9≤ Q²≤ 30.7 GeV².