Heavy-flavor electron-muon correlations in p +p and d +Au collisions at √sNN =200 GeV

Adare, A. and Afanasiev, S. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Al-Bataineh, H. and Alexander, J. and Angerami, A. and Aoki, K. and Apadula, N. and Aphecetche, L. and Aramaki, Y. and Asai, J. and Atomssa, E. T. and Averbeck, R. and Awes, T. C. and Azmoun, B. and Babintsev, V. and Bai, M. and Baksay, G. and Baksay, L. and Baldisseri, A. and Barish, K. N. and Barnes, P. D. and Bassalleck, B. and Basye, A. T. and Bathe, S. and Batsouli, S. and Baublis, V. and Baumann, C. and Csanád, Máté and Csörgő, Tamás and Dávid, Gábor and Imrek, József and Kiss, Ádám and Nagy, Márton and Ster, András and Sziklai, János István and Tarján, Péter and Vértesi, Róbert (2014) Heavy-flavor electron-muon correlations in p +p and d +Au collisions at √sNN =200 GeV. PHYSICAL REVIEW C, 89 (3). ISSN 2469-9985

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Abstract

We report e ±−µ ∓ pair yield from charm decay measured between midrapidity electrons (|η| < 0.35 and pT > 0.5 GeV/c) and forward rapidity muons (1.4 < η < 2.1 and pT > 1.0 GeV/c) as a function of ∆φ in both p+p and in d+Au collisions at √sNN = 200 GeV. Comparing the p+p results with several different models, we find the results are consistent with a total charm cross section σcc¯ = 538 ± 46 (stat) ± 197 (data syst) ± 174 (model syst) µb. These generators also indicate that the back-to-back peak at ∆φ = π is dominantly from the leading order contributions (gluon fusion), while higher order processes (flavor excitation and gluon splitting) contribute to the yield at all ∆φ. We observe a suppression in the pair yield per collision in d+Au. We find the pair yield suppression factor for 2.7 < ∆φ < 3.2 rad is JdA = 0.433 ± 0.087 (stat) ± 0.135 (syst), indicating cold nuclear matter modification of cc¯ pairs.

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