Helicity-Dependent Angular Distributions in Double-Charged-Pion Photoproduction
نویسنده
چکیده
Two-pion photoproduction in the reaction ~γp → pππ has been studied at Jefferson Lab Hall B using a circularly-polarized tagged photon beam in the energy range between 0.6 GeV and 2.3 GeV. Owing to the large angular acceptance of the CLAS detector, complete beam-helicity-dependent angular distributions of the final-state particles were measured. The large cross-section asymmetries exhibit strong sensitivity to the kinematics of the reaction and provide valuable information on the reaction dynamics. Preliminary results are presented.
منابع مشابه
Helicity-dependent Angular Distributions for Double-charged-pion Photoproduction
Two-pion photoproduction in the reaction γp → pπ + π − has been studied at Jeffer-son Lab Hall B using a circularly-polarized tagged photon beam in the energy range between 0.6 GeV and 2.3 GeV. Beam-helicity-dependent angular distributions of the final-state particles were measured. The large cross-section asymmetries that have been found exhibit strong sensitivity to the kinematics of the reac...
متن کاملth / 0 40 70 49 v 1 1 6 Ju l 2 00 4 Helicity asymmetries in double pion photoproduction on the proton February 28 , 2008
Based on a prior model on double pion photoproduction on the proton, successfully tested in total cross sections and invariant mass distributions, we make a theoretical study of the angular dependence of helicity asymmetries from the interaction of circularly polarized photons with unpolarized protons. We show that this observable is sensitive to details of the internal mechanisms and, thus, re...
متن کامل0 40 70 49 v 2 1 1 N ov 2 00 4 Helicity asymmetries in double pion photoproduction on the proton February 8 , 2008 L . Roca
Based on a prior model on double pion photoproduction on the proton, successfully tested in total cross sections and invariant mass distributions, we make a theoretical study of the angular dependence of helicity asymmetries from the interaction of circularly polarized photons with unpolarized protons. We show that this observable is sensitive to details of the internal mechanisms and, thus, re...
متن کاملNucleon helicity in pion photoproduction.
Pion-photoproduction data is examined to check for the nucleon-helicity conservation predicted by asymptotic QCD. The differential cross section shows agreement with constituent-counting rules, and polarization data is not in disagreement with conservation of nucleon helicity. However large uncertainties in the polarization measurements do not allow a conclusive statement. The helicity amplitud...
متن کاملMeasurement of the Helicity Difference in~γ~p → pπ+π− with the CLAS Spectrometer at Jefferson Laboratory
Abstract. The study of the properties of baryon resonances can provide us with hints to help us understand the structure of non-perturbative QCD and the effect of a particular resonance on polarization observables. The investigation of double-pion photoproduction data is needed to discover higher-lying states and their properties at and above W ≈ 1.8 GeV. Therefore, the analysis of the helicity...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2008