Precision Measurement Of The P(E,E ' P)Pi(0) Reaction At Threshold

K Chirapatpimol,M Shabestari,R A Lindgren,L C Smith,J R M Annand,D W Higinbotham,B Moffit,V Nelyubin,B E Norum,K Allada,K A Aniol,K Ardashev,D S Armstrong,Richard A Arndt,F Benmokhtar,Aron M Bernstein, W Bertozzi,W J Briscoe,L Bimbot,A Camsonne,J P Chen,S Choi,E Chudakov,E Cisbani,F Cusanno,M Dalton,C Dutta,K S Egiyan,C Fernandezramirez,R J Feuerbach,K G Fissum,S Frullani,F Garibaldi,O Gayou,Robert H Gilman,S Gilad,J L Goity,J A Gomez,Byungdong Hahn,D Hamilton,J O Hansen,Jun Huang,R Igarashi,D G Ireland,C W De Jager, Xiaohua Jin,Xingyu Jiang, T Jinasundera,J D Kellie,C Keppel,N R Kolb,J J Lerose,N Liyanage, K Livingston,D Mcnulty, L Mercado,R Michaels,Marko D Mihovilovic,Sijin Qian,X Qian,S Mailyan,V Mamyan,S Marrone,P Monaghan,Sirish Nanda,C F Perdrisat,E Piasetzky,D Protopopescu,V Punjabi,Y Qiang,I A Rachek,A Rakhman,G Ron,G Rosner,A Saha,B Sawatzky,A Shahinyan,S Sirca,N Sparveris,R Subedi,R Suleiman,I I Strakovsky,V Sulkosky, J Moinelo,H Voskanyan,Kun Wang,Yi Wang,Junko M Watson,D P Watts,B Wojtsekhowski,R L Workman,Hongbing Yao,Xiangjiang Zhan,Yanjin Zhang

PHYSICAL REVIEW LETTERS（2015）

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摘要

New results are reported from a measurement of pi(0) electroproduction near threshold using the p(e , e'p)pi(0) reaction. The experiment was designed to determine precisely the energy dependence of s- and p-wave electromagnetic multipoles as a stringent test of the predictions of chiral perturbation theory (ChPT). The data were taken with an electron beam energy of 1192 MeV using a two-spectrometer setup in Hall A at Jefferson Lab. For the first time, complete coverage of the. phi*(pi) and. theta*(pi) angles in the p pi(0) center of mass was obtained for invariant energies above threshold from 0.5 up to 15 MeV. The 4-momentum transfer Q(2) coverage ranges from 0.05 to 0.155 (GeV/c)(2) in fine steps. A simple phenomenological analysis of our data shows strong disagreement with p-wave predictions from ChPT for Q(2) > 0.07 (GeV/c)(2), while the s-wave predictions are in reasonable agreement.

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