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arXiv · 1010.1246

Cold Nuclear Matter Effects on J/psi Yields as a Function of Rapidity and Nuclear Geometry in Deuteron-Gold Collisions at sqrt(s_NN) = 200 GeV

A. Adare·S. Afanasiev·C. Aidala·N. N. Ajitanand·Y. Akiba·H. Al-Bataineh·J. Alexander·A. Angerami·K. Aoki·N. Apadula·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·J. H. Bhom·A. A. Bickley·D. S. Blau·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·A. Caringi·B. S. Chang·W. C. Chang·J. -L. Charvet·C. -H. Chen·S. Chernichenko·C. Y. Chi·M. Chiu·I. J. Choi·J. B. Choi·R. K. Choudhury·P. Christiansen·T. Chujo·P. Chung·A. Churyn·O. Chvala·V. Cianciolo·Z. Citron·B. A. Cole·Z. Conesa del Valle·M. Connors·P. Constantin·M. Csanád·T. Csörgő·T. Dahms·S. Dairaku·I. Danchev·K. Das·A. Datta·G. David·M. K. Dayananda·A. Denisov·D. d'Enterria·A. Deshpande·E. J. Desmond·K. V. Dharmawardane·O. Dietzsch·A. Dion·M. Donadelli·L. D Orazio·O. Drapier·A. Drees·K. A. Drees·A. K. Dubey·J. M. Durham·A. Durum·D. Dutta·V. Dzhordzhadze·S. Edwards·Y. V. Efremenko
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Abstract

We present measurements of J/psi yields in d+Au collisions at sqrt(s_NN) = 200 GeV recorded by the PHENIX experiment and compare with yields in p+p collisions at the same energy per nucleon-nucleon collision. The measurements cover a large kinematic range in J/psi rapidity (-2.2 < y < 2.4) with high statistical precision and are compared with two theoretical models: one with nuclear shadowing combined with final state breakup and one with coherent gluon saturation effects. To remove model dependent systematic uncertainties we also compare the data to a simple geometric model. We find that calculations where the nuclear modification is linear or exponential in the density weighted longitudinal thickness are difficult to reconcile with the forward rapidity data.

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A. Adare, S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, H. Al-Bataineh, J. Alexander, A. Angerami, K. Aoki, N. Apadula, 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, J. H. Bhom, A. A. Bickley, D. S. Blau, 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, A. Caringi, B. S. Chang, W. C. Chang, J. -L. Charvet, C. -H. Chen, S. Chernichenko, C. Y. Chi, M. Chiu, I. J. Choi, J. B. Choi, R. K. Choudhury, P. Christiansen, T. Chujo, P. Chung, A. Churyn, O. Chvala, V. Cianciolo, Z. Citron, B. A. Cole, Z. Conesa del Valle, M. Connors, P. Constantin, M. Csanád, T. Csörgő, T. Dahms, S. Dairaku, I. Danchev, K. Das, A. Datta, G. David, M. K. Dayananda, A. Denisov, D. d'Enterria, A. Deshpande, E. J. Desmond, K. V. Dharmawardane, O. Dietzsch, A. Dion, M. Donadelli, L. D Orazio, O. Drapier, A. Drees, K. A. Drees, A. K. Dubey, J. M. Durham, A. Durum, D. Dutta, V. Dzhordzhadze, S. Edwards, Y. V. Efremenko. 2010-10-06. Cold Nuclear Matter Effects on J/psi Yields as a Function of Rapidity and Nuclear Geometry in Deuteron-Gold Collisions at sqrt(s_NN) = 200 GeV. https://doi.org/10.1103/physrevlett.107.142301

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