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Dilepton distributions at backward rapidities

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Dilepton distributions at backward rapidities

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Título Dilepton distributions at backward rapidities
Autor Silva, Marcos André Betemps Vaz da
Gay Ducati, Maria Beatriz
Oliveira, Emmanuel Gräve de
Abstract The dilepton production at backward rapidities in pAu and pp collisions at RHIC and LHC energies is investigated in the dipole approach. The results are shown through the nuclear modification ratio RpA considering transverse momentum and rapidity spectra. The dilepton modification ratio presents interesting behavior at the backward rapidities when compared with the already known forward ones, since it is related with the large x kinematical region that is being probed. The rapidity dependence of the nuclear modification ratio in the dilepton production is strongly dependent on the Bjorken x behavior of the nuclear structure function ratio RF2 FA 2 =Fp 2 . The RpA transverse momentum dependence at backward rapidities is modified due to the large x nuclear effects: at RHIC energies, for instance, the ratio RpA is reduced as pT increases, presenting an opposite behavior when compared with the forward one. It implies that the dilepton production at backward rapidities should carry information of the nuclear effects at large Bjorken x, as well as that it is useful to investigate the pT dependence of the observables in this kinematical regime.
Contido em Physical review. D, Particles, fields, gravitation, and cosmology. College Park. Vol. 74, no. 9 (Nov. 2006), 094010 7p.
Assunto Colisões proton-proton
Cromodinamica quantica
Dileptons
Reacoes nucleares
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/104026
Arquivos Descrição Formato
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