Probing Hot and Dense Matter with Charm and Bottom Measurements with PHENIX VTX Tracker

Nouicer, R. and Adare, A. and Afanasiev, S. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Akimoto, R. and Al-Bataineh, H. and Al-Taʼani, H. and Alexander, J. and Andrews, K. R. and Angerami, A. and Aoki, K. and Apadula, N. and Aphecetche, L. and Appelt, E. and Aramaki, Y. and Armendariz, R. and Aronson, S. H. and Asai, J. and Asano, H. and Aschenauer, E. C. and Atomssa, E. T. and Averbeck, R. and Awes, T. C. and Azmoun, B. and Babintsev, V. and Bai, M. and Bai, X. and Baksay, G. and Csanád, Máté and Csörgő, Tamás and Imrek, József and Kiss, Árpád and Varga-Kőfaragó, Mónika and Nagy, Márton and Novák, Tamás and Ster, András and Sziklai, János István and Tarján, Péter and Vargyas, Márton and Vértesi, Róbert and Zimányi, József (2013) Probing Hot and Dense Matter with Charm and Bottom Measurements with PHENIX VTX Tracker. NUCLEAR PHYSICS A, 904. 647C-652C. ISSN 0375-9474

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Abstract

We present the first measurements of the nuclear modification factor (RAA) for flavor-separated b, c-quark electrons in Au+Au collisions at √sNN = 200 GeV. The newly installed Silicon Vertex Tracker is used to measure the distance of closest approach distributions of electrons at midra- pidity (|η|< 0.35) over the transverse momentum range 1 <pe T < 5 GeV/c. From this, the relative fraction of bottom (b) and charm (c) quarks is determined in both the p+p and Au+Au collision systems, which form the basis of the measured RAA. In p+p, we observe that a FONLL perturba- tive QCD calculation of b →e/(c →e+b →e) ratio is in good agreement with the data. In Au+Au, the data imply a large suppression of b→e or a large modification of B meson pT distributions, which implies very interesting physics of B mesons in Au+Au collisions.

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