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arXiv · 1208.1234

Direct photon production in d+Au collisions at sqrt(s_NN)=200 GeV

A. Adare·S. S. Adler·S. Afanasiev·C. Aidala·N. N. Ajitanand·Y. Akiba·H. Al-Bataineh·A. Al-Jamel·J. Alexander·A. Angerami·K. Aoki·N. Apadula·L. Aphecetche·Y. Aramaki·R. Armendariz·S. H. Aronson·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·F. Bauer·C. Baumann·A. Bazilevsky·S. Belikov·R. Belmont·R. Bennett·A. Berdnikov·Y. Berdnikov·J. H. Bhom·A. A. Bickley·M. T. Bjorndal·D. S. Blau·J. G. Boissevain·J. S. Bok·H. Borel·K. Boyle·M. L. Brooks·D. S. Brown·N. Bruner·D. Bucher·H. Buesching·V. Bumazhnov·G. Bunce·J. M. Burward-Hoy·S. Butsyk·C. M. Camacho·X. Camard·S. Campbell·A. Caringi·P. Chand·B. S. Chang·W. C. Chang·J. -L. Charvet·C. -H. Chen·S. Chernichenko·C. Y. Chi·J. Chiba·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·Y. Cobigo·B. A. Cole·M. P. Comets·Z. Conesa del Valle·M. Connors·P. Constantin·M. Csanád·T. Csörgő·J. P. Cussonneau·T. Dahms·S. Dairaku·I. Danchev·K. Das·A. Datta·G. David·M. K. Dayananda·F. Deák·H. Delagrange·A. Denisov
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Abstract

Direct photons have been measured in sqrt(s_NN)=200 GeV d+Au collisions at midrapidity. A wide p_T range is covered by measurements of nearly-real virtual photons (1<p_T<6 GeV/c) and real photons (5<p_T<16 GeV/c). The invariant yield of the direct photons in d+Au collisions over the scaled p+p cross section is consistent with unity. Theoretical calculations assuming standard cold nuclear matter effects describe the data well for the entire p_T range. This indicates that the large enhancement of direct photons observed in Au+Au collisions for 1.0<p_T<2.5 GeV/c is due to a source other than the initial-state nuclear effects.

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A. Adare, S. S. Adler, S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, H. Al-Bataineh, A. Al-Jamel, J. Alexander, A. Angerami, K. Aoki, N. Apadula, L. Aphecetche, Y. Aramaki, R. Armendariz, S. H. Aronson, 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, F. Bauer, C. Baumann, A. Bazilevsky, S. Belikov, R. Belmont, R. Bennett, A. Berdnikov, Y. Berdnikov, J. H. Bhom, A. A. Bickley, M. T. Bjorndal, D. S. Blau, J. G. Boissevain, J. S. Bok, H. Borel, K. Boyle, M. L. Brooks, D. S. Brown, N. Bruner, D. Bucher, H. Buesching, V. Bumazhnov, G. Bunce, J. M. Burward-Hoy, S. Butsyk, C. M. Camacho, X. Camard, S. Campbell, A. Caringi, P. Chand, B. S. Chang, W. C. Chang, J. -L. Charvet, C. -H. Chen, S. Chernichenko, C. Y. Chi, J. Chiba, 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, Y. Cobigo, B. A. Cole, M. P. Comets, Z. Conesa del Valle, M. Connors, P. Constantin, M. Csanád, T. Csörgő, J. P. Cussonneau, T. Dahms, S. Dairaku, I. Danchev, K. Das, A. Datta, G. David, M. K. Dayananda, F. Deák, H. Delagrange, A. Denisov. 2012-08-06. Direct photon production in d+Au collisions at sqrt(s_NN)=200 GeV. https://doi.org/10.1103/physrevc.87.054907

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