Measurements of the Nucleon Structure Function in the Range 0.002 < X < 0.17 and 00.2 < Q2 < 8 GeV2 in Deuterium, Carbon and Calcium

M ARNEODO,A ARVIDSON,JJ AUBERT,B BADELEK,J BEAUFAYS,CP BEE,C BENCHOUK,G BERGHOFF,IG BIRD,D BLUM,E BOHM,X DEBOUARD,FW BRASSE,H BRAUN,C BROLL,SC BROWN,H BRUCK,H CALEN,JS CHIMA,J CIBOROWSKI,R CLIFFT,G COIGNET,F COMBLEY,J COUGHLAN,G DAGOSTINI,S DAHLGREN,I DERADO,T DREYER,J DREES,M DUREN,V ECKARDT, A EDWARDS,M EDWARDS,T ERNST,G ESZES,J FAVIER, MI FERRERO, J FIGIEL,W FLAUGER,J FOSTER,E GABATHULER,J GAJEWSKI,R GAMET,N GEDDES,P GRAFSTROM,L GUSTAFSSON,J HAAS,E HAGBERG,FJ HASERT,P HAYMAN,P HEUSSE,M JAFFRE,A JACHOLKOWSKA,F JANATA,G JANCSO,AS JOHNSON, EM KABUSS,G KELLNER,A KRUGER,J KRUGER,S KULLANDER,U LANDGRAF,D LANSKE,J LOKEN,K LONG,M MAIRE,P MALECKI,A MANZ,S MASELLI,W MOHR,F MONTANET, HE MONTGOMERY,E NAGY,J NASSALSKI,PR NORTON,FG OAKHAM,AM OSBORNE,C PASCAUD,B PAWLIK,P PAYRE,C PERONI,H PESCHEL,H PESSARD, J PETTINGALE,B PIETRZYK, B POENSGEN,M POTSCH,P RENTON,P RIBARICS,K RITH,E RONDIO,A SANDACZ,M SCHEER,A SCHLAGBOHMER,H SCHIEMANN,N SCHMITZ, M SCHNEEGANS,M SCHOLZ,M SCHOUTEN,T SCHRODER,K SCHULTZE,T SLOAN,HE STIER, M STUDT,GN TAYLOR,JM THENARD,JC THOMPSON, A DELATORRE,J TOTH,L URBAN,W WALLUCKS,M WHALLEY,S WHEELER,WSC WILLIAMS,SJ WIMPENNY,R WINDMOLDERS,G WOLF

Nuclear physics B（1990）

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摘要

Small angle scattering of 280 GeV positive muons by deuterium, carbon and calcium has been measured at scattering angles down to 2 mrad. The nucleon structure function F2 extracted from deuterium does not show a significant x dependence in the measured range of Q2 and its Q2 dependence is linear in logQ2. For calcium, a depletion of F2 is observed at low x by 30% as compared with the values at x = 0.1 where F2(Ca) and F2 (D) are not significantly different. This depletion is attributed to shadowing. The carbon structure function exhibits a similar, but less pronounced, x dependence. Such behaviour is observed to be independent of Q2. The data are consistent with those obtained from other charged lepton experiments both at similar and higher values of x and Q2 and considerably extend the range of the measurements down to the low values of x to be measured in forthcoming experiments at HERA.

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