Measurement of the photon structure functionF 2 γ (x, Q2) in the region 0.2&lt;Q 2&lt;7 GeV2

H Aihara ,M K Sullivan,Z R Wolf,J N Marx,H S Kaye,W Gorn,S Toutounchi,D H Stork,A Lu,R R Mcneil,R J Madaras,A M Eisner,T K Edberg,J J Eastman,S O Melnikoff,K H Kees,J Hylen,M Pripstein,T Kamae,N Toge,D O Caldwell,J S Steinman,K A Derby,G J Vandalen,J W Gary,A Buijs,B A Barnett,B D Magnuson,J G Layter,R I Koda,D R Nygren,B C Shen,W Vernon,J M Hauptman,K A Schwitkis,P J Oddone,M T Ronan,L T Kerth,H P Paar,S C Loken,W G.j Langeveld ,B Van Uitert ,D A Bauer ,W Wagner ,M Wayne ,R Enomoto ,J R Smith ,James R Thompson ,A R Barker ,G Shapiro ,M Alston‐Garnjost ,W Ko ,C S Lindsey ,Hans-Uno Bengtsson ,Tadayuki Takahashi ,F.l Linde ,R R Ross ,M Shapiro ,G Masek ,C Zeitlin ,T Fujii ,E S Miller ,G Lynch ,R E Avery ,S K Park ,R W Kenney ,K K Kwong ,R Kofler ,D A Park ,G D Cowan ,M L Stevenson ,W.w Moses ,R F Van Daalen Wetters ,D Bintinger ,C Buchanan ,A Bross ,H Yamamoto ,F Rouse ,J.c Sens ,J A J Matthews ,S J Maxfield ,M G Strauss ,F.c Erné ,R Lander ,M C S Williams ,A V Barnes ,D Crane ,K Maeshima ,J E Huth ,W Slater ,S Yellin ,W A Wenzel ,P Némethy ,R Van Tyen ,D Pellett ,G J Bobbink ,A Barbaro‐Galtieri ,T Bologneşe ,Y X Wang ,L Mathis ,E M Wang ,O I Dahl ,P.h Eberhard ,X Q Lu ,A R Clark ,J T White ,W Hofmann ,W M Zhang

doi:10.1007/bf01561108

Measurement of the photon structure functionF 2 γ (x, Q2) in the region 0.2<Q 2<7 GeV2

H Aihara , M K Sullivan + Show 106 more

https://doi.org/10.1007/bf01561108

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We present a measurement of the photon structure functionF2γ in the reactionee→eeX forQ2 in the range 0.2<Q2<7 GeV2, using 9,200 multihadron events obtained with the TPC/Two-Gamma detector at PEP. The data have been corrected for detector effects using a regularized unfolding procedure and are presented as a function ofx andQ2. The structure function shows scaling in the region 0.3<Q2<1.6 GeV2,x<0.3 and rises for higherQ2. AtQ2=5.1 GeV2 the results are compared with QCD and, within the scheme of Antoniadis and Grunberg, rather conservative bounds for the QCD scale parameter of 133±50<\(\Lambda _{\overline {{\rm M}S} } \)<268±98 MeV are obtained. A study of the final state structure shows that the rise ofF2γ is consistent with being entirely due to the pointlike component of the photon.

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