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arXiv · 1005.4916

Transverse momentum dependence of eta meson suppression in Au+Au collisions at sqrt(s_NN) = 200 GeV

A. Adare·S. Afanasiev·C. Aidala·N. N. Ajitanand·Y. Akiba·H. Al-Bataineh·J. Alexander·K. Aoki·L. Aphecetche·Y. Aramaki·J. Asai·E. T. Atomssa·R. Averbeck·T. C. Awes·B. Azmoun·V. Babintsev·M. Bai·G. Baksay·L. Baksay·A. Baldisseri·K. N. Barish·P. D. Barnes·B. Bassalleck·A. T. Basye·S. Bathe·S. Batsouli·V. Baublis·C. Baumann·A. Bazilevsky·S. Belikov·R. Belmont·R. Bennett·A. Berdnikov·Y. Berdnikov·A. A. Bickley·J. G. Boissevain·J. S. Bok·H. Borel·K. Boyle·M. L. Brooks·H. Buesching·V. Bumazhnov·G. Bunce·S. Butsyk·C. M. Camacho·S. Campbell·B. S. Chang·W. C. Chang·J. -L. Charvet·C. -H. Chen·S. Chernichenko·C. Y. Chi·M. Chiu·I. J. Choi·R. K. Choudhury·P. Christiansen·T. Chujo·P. Chung·A. Churyn·O. Chvala·V. Cianciolo·Z. Citron·B. A. Cole·M. Connors·P. Constantin·M. Csanád·T. Csörgő·T. Dahms·S. Dairaku·I. Danchev·K. Das·A. Datta·G. David·A. Denisov·D. d'Enterria·A. Deshpande·E. J. Desmond·O. Dietzsch·A. Dion·M. Donadelli·O. Drapier·A. Drees·K. A. Drees·A. K. Dubey·J. M. Durham·A. Durum·D. Dutta·V. Dzhordzhadze·S. Edwards·Y. V. Efremenko·F. Ellinghaus·T. Engelmore·A. Enokizono·H. En'yo·S. Esumi·K. O. Eyser·B. Fadem·D. E. Fields·M. Finger, Jr.·M. Finger
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Abstract

New measurements by the PHENIX experiment at RHIC for eta production at midrapidity as a function of transverse momentum (p_T) and collision centrality in sqrt(s_NN) = 200 GeV Au+Au and p+p collisions are presented. They indicate nuclear modification factors (R_AA) that are similar both in magnitude and trend to those found in earlier pi^0 measurements. Linear fits to R_AA in the 5--20 GeV/c p_T region show that the slope is consistent with zero within two standard deviations at all centralities although a slow rise cannot be excluded. Having different statistical and systematic uncertainties the pi^0 and eta measurements are complementary at high p_T; thus, along with the extended p_T range of these data they can provide additional constraints for theoretical modeling and the extraction of transport properties.

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A. Adare, S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, H. Al-Bataineh, J. Alexander, K. Aoki, L. Aphecetche, Y. Aramaki, J. Asai, E. T. Atomssa, R. Averbeck, T. C. Awes, B. Azmoun, V. Babintsev, M. Bai, G. Baksay, L. Baksay, A. Baldisseri, K. N. Barish, P. D. Barnes, B. Bassalleck, A. T. Basye, S. Bathe, S. Batsouli, V. Baublis, C. Baumann, A. Bazilevsky, S. Belikov, R. Belmont, R. Bennett, A. Berdnikov, Y. Berdnikov, A. A. Bickley, J. G. Boissevain, J. S. Bok, H. Borel, K. Boyle, M. L. Brooks, H. Buesching, V. Bumazhnov, G. Bunce, S. Butsyk, C. M. Camacho, S. Campbell, B. S. Chang, W. C. Chang, J. -L. Charvet, C. -H. Chen, S. Chernichenko, C. Y. Chi, M. Chiu, I. J. Choi, R. K. Choudhury, P. Christiansen, T. Chujo, P. Chung, A. Churyn, O. Chvala, V. Cianciolo, Z. Citron, B. A. Cole, M. Connors, P. Constantin, M. Csanád, T. Csörgő, T. Dahms, S. Dairaku, I. Danchev, K. Das, A. Datta, G. David, A. Denisov, D. d'Enterria, A. Deshpande, E. J. Desmond, O. Dietzsch, A. Dion, M. Donadelli, O. Drapier, A. Drees, K. A. Drees, A. K. Dubey, J. M. Durham, A. Durum, D. Dutta, V. Dzhordzhadze, S. Edwards, Y. V. Efremenko, F. Ellinghaus, T. Engelmore, A. Enokizono, H. En'yo, S. Esumi, K. O. Eyser, B. Fadem, D. E. Fields, M. Finger, Jr., M. Finger. 2010-05-26. Transverse momentum dependence of eta meson suppression in Au+Au collisions at sqrt(s_NN) = 200 GeV. https://doi.org/10.1103/physrevc.82.011902

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