Nuclear modification factors for hadrons at forward and backward rapidities in deuteron gold collisions at root s(NN) = 200 GeV

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Nuclear modification factors for hadrons at forward and backward rapidities in deuteron gold collisions at root s(NN) = 200 GeV

Adler, S.S.; Gustafsson, Hans-Åke; Nystrand, Joakim; Oskarsson, Anders; Otterlund, Ingvar; Rosendahl, Sarah; Stenlund, Evert; Tydesjö, Henrik

Physical review letters, 03/2005, Volume: 94, Issue: 8

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We report on charged hadron production in deuteron-gold reactions at roots(NN) = 200 GeV. Our measurements in the deuteron direction cover 1.4<eta<2.2, referred to as forward rapidity, and in the gold direction -2.0<eta<-1.4, referred to as backward rapidity, and a transverse momentum range p(T)=0.5-4.0 GeV/c. We compare the relative yields for different deuteron-gold collision centrality classes. We observe a suppression relative to binary collision scaling at forward rapidity, sensitive to low momentum fraction (x) partons in the gold nucleus, and an enhancement at backward rapidity, sensitive to high momentum fraction partons in the gold nucleus.

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