rho^0$ photoproduction in ultraperipheral relativistic heavy ion collisions at $\sqrt{S_{NN}}$=200 GeV
Photoproduction reactions occur when the electromagnetic field of a relativistic heavy ion interacts with another heavy ion. The STAR collaboration presents a measurement of rho^0 and direct pi^+pi^- photoproduction in ultra-peripheral relativistic heavy ion collisions at sqrt(s_{NN})=200 GeV. We ob...
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| Veröffentlicht in: | Physical review. C 2008, Vol.77 |
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| creator | Abelev, B.I. Aggarwal, M.M. Ahammed, Z. Anderson, B.D. Arkhipkin, D. Averichev, G.S. Bai, Y. Balewski, J. Barannikova, O. Barnby, L.S. Baudot, J. Baumgart, S. Beavis, D.R. Bellwied, R. Benedosso, F. Betts, R.R. Bhardwaj, S. Bhasin, A. Bhati, A.K. Bichsel, H. Bielcik, J. Bielcikova, J. Bland, L.C. Blyth, S.-L. Bombara, M. Bonner, B.E. Botje, M. Bouchet, J. Braidot, E. Brandin, A.V. Bueltmann, S. Burton, T.P. Bystersky, M. Cai, X.Z. Caines, H. Calderon de La Barca Sanchez, M. Callner, J. Catu, O. Cebra, D. Cervantes, M.C. Chajecki, Z. Chaloupka, P. Chattopadhyay, S. Chen, H.F. Chen, J.H. Chen, J.Y. Cheng, J. Cherney, M. Chikanian, A. Choi, K.E. Christie, W. Chung, S.U. Clarke, R.F. Codrington, M.J.M. Coffin, J.P. Cormier, T.M. Cosentino, M.R. Cramer, J.G. Crawford, H.J. Das, D. Dash, S. Daugherity, M. de Moura, M.M. Dedovich, T.G. Dephillips, M. Derevschikov, A.A. Derradi de Souza, R. Didenko, L. Dietel, T. Djawotho, P. Dogra, S.M. Dong, X. Drachenberg, J.L. Draper, J.E. Du, F. Dunlop, J.C. Dutta Mazumdar, M.R. Edwards, W.R. Efimov, L.G. Elhalhuli, E. Emelianov, V. Engelage, J. Eppley, G. Erazmus, B. Estienne, Magali Eun, L. Fachini, P. Fatemi, R. Fedorisin, J. Feng, A. Filip, P. Finch, E. Fine, V. Fisyak, Y. Fu, J. Gagliardi, C.A. Gaillard, L. Ganti, M.S. Garcia-Solis, E. Ghazikhanian, V. |
| description | Photoproduction reactions occur when the electromagnetic field of a relativistic heavy ion interacts with another heavy ion. The STAR collaboration presents a measurement of rho^0 and direct pi^+pi^- photoproduction in ultra-peripheral relativistic heavy ion collisions at sqrt(s_{NN})=200 GeV. We observe both exclusive photoproduction and photoproduction accompanied by mutual Coulomb excitation. We find a coherent cross-section of sigma(AuAu) -> Au^*Au^*rho^0 = 530 pm 19 (stat.) pm 57 (syst.) mb, in accord with theoretical calculations based on a Glauber approach, but considerably below the predictions of a color dipole model. The rho^0 transverse momentum spectrum (p_{T}^2 ) is fit by a double exponential curve including both coherent and incoherent coupling to the target nucleus; we find sigma_{inc}/sigma_{coh} = 0.29 pm 0.03 (stat.) pm 0.08 (syst.). The ratio of direct pi^+pi^- to rho^0 production is comparable to that observed in gamma p collisions at HERA, and appears to be independent of photon energy. Finally, the measured rho^0 spin helicity matrix elements agree within errors with the expected s-channel helicity conservation. |
| doi_str_mv | 10.1103/PhysRevC.77.034910 |
| format | Article |
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The STAR collaboration presents a measurement of rho^0 and direct pi^+pi^- photoproduction in ultra-peripheral relativistic heavy ion collisions at sqrt(s_{NN})=200 GeV. We observe both exclusive photoproduction and photoproduction accompanied by mutual Coulomb excitation. We find a coherent cross-section of sigma(AuAu) -> Au^*Au^*rho^0 = 530 pm 19 (stat.) pm 57 (syst.) mb, in accord with theoretical calculations based on a Glauber approach, but considerably below the predictions of a color dipole model. The rho^0 transverse momentum spectrum (p_{T}^2 ) is fit by a double exponential curve including both coherent and incoherent coupling to the target nucleus; we find sigma_{inc}/sigma_{coh} = 0.29 pm 0.03 (stat.) pm 0.08 (syst.). The ratio of direct pi^+pi^- to rho^0 production is comparable to that observed in gamma p collisions at HERA, and appears to be independent of photon energy. Finally, the measured rho^0 spin helicity matrix elements agree within errors with the expected s-channel helicity conservation.</description><identifier>ISSN: 2469-9985</identifier><identifier>EISSN: 2469-9993</identifier><identifier>DOI: 10.1103/PhysRevC.77.034910</identifier><language>eng</language><publisher>American Physical Society</publisher><subject>Nuclear Experiment ; Physics</subject><ispartof>Physical review. C, 2008, Vol.77</ispartof><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><orcidid>0000-0001-9611-2004 ; 0000-0001-7547-4241 ; 0000-0002-4684-3121 ; 0000-0002-2039-0590 ; 0000-0003-1825-7907 ; 0000-0001-5920-6271 ; 0000-0002-2967-790X ; 0000-0002-6611-4380 ; 0000-0003-0687-5580 ; 0000-0001-6413-4479 ; 0000-0003-3069-726X ; 0000-0003-0687-5580 ; 0000-0002-6611-4380</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,315,781,785,886,4025,27928,27929,27930</link.rule.ids><backlink>$$Uhttps://in2p3.hal.science/in2p3-00269881$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Abelev, B.I.</creatorcontrib><creatorcontrib>Aggarwal, M.M.</creatorcontrib><creatorcontrib>Ahammed, 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J.</creatorcontrib><creatorcontrib>Cherney, M.</creatorcontrib><creatorcontrib>Chikanian, A.</creatorcontrib><creatorcontrib>Choi, K.E.</creatorcontrib><creatorcontrib>Christie, W.</creatorcontrib><creatorcontrib>Chung, S.U.</creatorcontrib><creatorcontrib>Clarke, R.F.</creatorcontrib><creatorcontrib>Codrington, M.J.M.</creatorcontrib><creatorcontrib>Coffin, J.P.</creatorcontrib><creatorcontrib>Cormier, T.M.</creatorcontrib><creatorcontrib>Cosentino, M.R.</creatorcontrib><creatorcontrib>Cramer, J.G.</creatorcontrib><creatorcontrib>Crawford, H.J.</creatorcontrib><creatorcontrib>Das, D.</creatorcontrib><creatorcontrib>Dash, S.</creatorcontrib><creatorcontrib>Daugherity, M.</creatorcontrib><creatorcontrib>de Moura, M.M.</creatorcontrib><creatorcontrib>Dedovich, T.G.</creatorcontrib><creatorcontrib>Dephillips, M.</creatorcontrib><creatorcontrib>Derevschikov, A.A.</creatorcontrib><creatorcontrib>Derradi de Souza, R.</creatorcontrib><creatorcontrib>Didenko, L.</creatorcontrib><creatorcontrib>Dietel, T.</creatorcontrib><creatorcontrib>Djawotho, P.</creatorcontrib><creatorcontrib>Dogra, S.M.</creatorcontrib><creatorcontrib>Dong, X.</creatorcontrib><creatorcontrib>Drachenberg, J.L.</creatorcontrib><creatorcontrib>Draper, J.E.</creatorcontrib><creatorcontrib>Du, F.</creatorcontrib><creatorcontrib>Dunlop, J.C.</creatorcontrib><creatorcontrib>Dutta Mazumdar, M.R.</creatorcontrib><creatorcontrib>Edwards, W.R.</creatorcontrib><creatorcontrib>Efimov, L.G.</creatorcontrib><creatorcontrib>Elhalhuli, E.</creatorcontrib><creatorcontrib>Emelianov, V.</creatorcontrib><creatorcontrib>Engelage, J.</creatorcontrib><creatorcontrib>Eppley, G.</creatorcontrib><creatorcontrib>Erazmus, B.</creatorcontrib><creatorcontrib>Estienne, Magali</creatorcontrib><creatorcontrib>Eun, L.</creatorcontrib><creatorcontrib>Fachini, P.</creatorcontrib><creatorcontrib>Fatemi, R.</creatorcontrib><creatorcontrib>Fedorisin, J.</creatorcontrib><creatorcontrib>Feng, A.</creatorcontrib><creatorcontrib>Filip, P.</creatorcontrib><creatorcontrib>Finch, E.</creatorcontrib><creatorcontrib>Fine, V.</creatorcontrib><creatorcontrib>Fisyak, Y.</creatorcontrib><creatorcontrib>Fu, J.</creatorcontrib><creatorcontrib>Gagliardi, C.A.</creatorcontrib><creatorcontrib>Gaillard, L.</creatorcontrib><creatorcontrib>Ganti, M.S.</creatorcontrib><creatorcontrib>Garcia-Solis, E.</creatorcontrib><creatorcontrib>Ghazikhanian, V.</creatorcontrib><title>rho^0$ photoproduction in ultraperipheral relativistic heavy ion collisions at $\sqrt{S_{NN}}$=200 GeV</title><title>Physical review. C</title><description>Photoproduction reactions occur when the electromagnetic field of a relativistic heavy ion interacts with another heavy ion. The STAR collaboration presents a measurement of rho^0 and direct pi^+pi^- photoproduction in ultra-peripheral relativistic heavy ion collisions at sqrt(s_{NN})=200 GeV. We observe both exclusive photoproduction and photoproduction accompanied by mutual Coulomb excitation. We find a coherent cross-section of sigma(AuAu) -> Au^*Au^*rho^0 = 530 pm 19 (stat.) pm 57 (syst.) mb, in accord with theoretical calculations based on a Glauber approach, but considerably below the predictions of a color dipole model. The rho^0 transverse momentum spectrum (p_{T}^2 ) is fit by a double exponential curve including both coherent and incoherent coupling to the target nucleus; we find sigma_{inc}/sigma_{coh} = 0.29 pm 0.03 (stat.) pm 0.08 (syst.). The ratio of direct pi^+pi^- to rho^0 production is comparable to that observed in gamma p collisions at HERA, and appears to be independent of photon energy. Finally, the measured rho^0 spin helicity matrix elements agree within errors with the expected s-channel helicity conservation.</description><subject>Nuclear Experiment</subject><subject>Physics</subject><issn>2469-9985</issn><issn>2469-9993</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><recordid>eNqVyjFLAzEYgOEgChbtH3DKcJv0_HKpd5fBQYq2gxRRcRLDx5mST-IlJunBUfrfVRB3p_cZXsbOBJRCgLy4t2N6MMOibJoS5FwJOGCTal6rmVJKHv65vTxm05TeAUDUoBoBE7aJ1r9CwYP12Yfo37ZdJt9z6vnW5YjBRArWRHQ8GoeZBkqZOm4NDiP_OTvvHKVvJY6ZFy_pM-bdo96t1_t9cVUB8KV5PmVHG3TJTH97ws5vb54Wq5lFp0OkD4yj9kh6dX2nqa-C1ABVrdpWDEL-7_4Cc49Ulw</recordid><startdate>2008</startdate><enddate>2008</enddate><creator>Abelev, B.I.</creator><creator>Aggarwal, M.M.</creator><creator>Ahammed, Z.</creator><creator>Anderson, B.D.</creator><creator>Arkhipkin, D.</creator><creator>Averichev, G.S.</creator><creator>Bai, Y.</creator><creator>Balewski, J.</creator><creator>Barannikova, 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X.</creator><creator>Drachenberg, J.L.</creator><creator>Draper, J.E.</creator><creator>Du, F.</creator><creator>Dunlop, J.C.</creator><creator>Dutta Mazumdar, M.R.</creator><creator>Edwards, W.R.</creator><creator>Efimov, L.G.</creator><creator>Elhalhuli, E.</creator><creator>Emelianov, V.</creator><creator>Engelage, J.</creator><creator>Eppley, G.</creator><creator>Erazmus, B.</creator><creator>Estienne, Magali</creator><creator>Eun, L.</creator><creator>Fachini, P.</creator><creator>Fatemi, R.</creator><creator>Fedorisin, J.</creator><creator>Feng, A.</creator><creator>Filip, P.</creator><creator>Finch, E.</creator><creator>Fine, V.</creator><creator>Fisyak, Y.</creator><creator>Fu, J.</creator><creator>Gagliardi, C.A.</creator><creator>Gaillard, L.</creator><creator>Ganti, M.S.</creator><creator>Garcia-Solis, E.</creator><creator>Ghazikhanian, V.</creator><general>American Physical Society</general><scope>1XC</scope><orcidid>https://orcid.org/0000-0001-9611-2004</orcidid><orcidid>https://orcid.org/0000-0001-7547-4241</orcidid><orcidid>https://orcid.org/0000-0002-4684-3121</orcidid><orcidid>https://orcid.org/0000-0002-2039-0590</orcidid><orcidid>https://orcid.org/0000-0003-1825-7907</orcidid><orcidid>https://orcid.org/0000-0001-5920-6271</orcidid><orcidid>https://orcid.org/0000-0002-2967-790X</orcidid><orcidid>https://orcid.org/0000-0002-6611-4380</orcidid><orcidid>https://orcid.org/0000-0003-0687-5580</orcidid><orcidid>https://orcid.org/0000-0001-6413-4479</orcidid><orcidid>https://orcid.org/0000-0003-3069-726X</orcidid><orcidid>https://orcid.org/0000-0003-0687-5580</orcidid><orcidid>https://orcid.org/0000-0002-6611-4380</orcidid></search><sort><creationdate>2008</creationdate><title>rho^0$ photoproduction in ultraperipheral relativistic heavy ion collisions at $\sqrt{S_{NN}}$=200 GeV</title><author>Abelev, B.I. ; Aggarwal, M.M. ; Ahammed, Z. ; Anderson, B.D. ; Arkhipkin, D. ; Averichev, G.S. ; Bai, Y. ; Balewski, J. ; Barannikova, O. ; Barnby, L.S. ; Baudot, J. ; Baumgart, S. ; Beavis, D.R. ; Bellwied, R. ; Benedosso, F. ; Betts, R.R. ; Bhardwaj, S. ; Bhasin, A. ; Bhati, A.K. ; Bichsel, H. ; Bielcik, J. ; Bielcikova, J. ; Bland, L.C. ; Blyth, S.-L. ; Bombara, M. ; Bonner, B.E. ; Botje, M. ; Bouchet, J. ; Braidot, E. ; Brandin, A.V. ; Bueltmann, S. ; Burton, T.P. ; Bystersky, M. ; Cai, X.Z. ; Caines, H. ; Calderon de La Barca Sanchez, M. ; Callner, J. ; Catu, O. ; Cebra, D. ; Cervantes, M.C. ; Chajecki, Z. ; Chaloupka, P. ; Chattopadhyay, S. ; Chen, H.F. ; Chen, J.H. ; Chen, J.Y. ; Cheng, J. ; Cherney, M. ; Chikanian, A. ; Choi, K.E. ; Christie, W. ; Chung, S.U. ; Clarke, R.F. ; Codrington, M.J.M. ; Coffin, J.P. ; Cormier, T.M. ; Cosentino, M.R. ; Cramer, J.G. ; Crawford, H.J. ; Das, D. ; Dash, S. ; Daugherity, M. ; de Moura, M.M. ; Dedovich, T.G. ; Dephillips, M. ; Derevschikov, A.A. ; Derradi de Souza, R. ; Didenko, L. ; Dietel, T. ; Djawotho, P. ; Dogra, S.M. ; Dong, X. ; Drachenberg, J.L. ; Draper, J.E. ; Du, F. ; Dunlop, J.C. ; Dutta Mazumdar, M.R. ; Edwards, W.R. ; Efimov, L.G. ; Elhalhuli, E. ; Emelianov, V. ; Engelage, J. ; Eppley, G. ; Erazmus, B. ; Estienne, Magali ; Eun, L. ; Fachini, P. ; Fatemi, R. ; Fedorisin, J. ; Feng, A. ; Filip, P. ; Finch, E. ; Fine, V. ; Fisyak, Y. ; Fu, J. ; Gagliardi, C.A. ; Gaillard, L. ; Ganti, M.S. ; Garcia-Solis, E. ; Ghazikhanian, V.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-hal_primary_oai_HAL_in2p3_00269881v13</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>Nuclear Experiment</topic><topic>Physics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Abelev, B.I.</creatorcontrib><creatorcontrib>Aggarwal, M.M.</creatorcontrib><creatorcontrib>Ahammed, Z.</creatorcontrib><creatorcontrib>Anderson, B.D.</creatorcontrib><creatorcontrib>Arkhipkin, D.</creatorcontrib><creatorcontrib>Averichev, G.S.</creatorcontrib><creatorcontrib>Bai, Y.</creatorcontrib><creatorcontrib>Balewski, J.</creatorcontrib><creatorcontrib>Barannikova, O.</creatorcontrib><creatorcontrib>Barnby, L.S.</creatorcontrib><creatorcontrib>Baudot, J.</creatorcontrib><creatorcontrib>Baumgart, S.</creatorcontrib><creatorcontrib>Beavis, D.R.</creatorcontrib><creatorcontrib>Bellwied, R.</creatorcontrib><creatorcontrib>Benedosso, F.</creatorcontrib><creatorcontrib>Betts, R.R.</creatorcontrib><creatorcontrib>Bhardwaj, S.</creatorcontrib><creatorcontrib>Bhasin, A.</creatorcontrib><creatorcontrib>Bhati, A.K.</creatorcontrib><creatorcontrib>Bichsel, H.</creatorcontrib><creatorcontrib>Bielcik, J.</creatorcontrib><creatorcontrib>Bielcikova, J.</creatorcontrib><creatorcontrib>Bland, L.C.</creatorcontrib><creatorcontrib>Blyth, S.-L.</creatorcontrib><creatorcontrib>Bombara, M.</creatorcontrib><creatorcontrib>Bonner, B.E.</creatorcontrib><creatorcontrib>Botje, M.</creatorcontrib><creatorcontrib>Bouchet, J.</creatorcontrib><creatorcontrib>Braidot, E.</creatorcontrib><creatorcontrib>Brandin, A.V.</creatorcontrib><creatorcontrib>Bueltmann, S.</creatorcontrib><creatorcontrib>Burton, T.P.</creatorcontrib><creatorcontrib>Bystersky, M.</creatorcontrib><creatorcontrib>Cai, X.Z.</creatorcontrib><creatorcontrib>Caines, H.</creatorcontrib><creatorcontrib>Calderon de La Barca Sanchez, M.</creatorcontrib><creatorcontrib>Callner, J.</creatorcontrib><creatorcontrib>Catu, O.</creatorcontrib><creatorcontrib>Cebra, D.</creatorcontrib><creatorcontrib>Cervantes, M.C.</creatorcontrib><creatorcontrib>Chajecki, Z.</creatorcontrib><creatorcontrib>Chaloupka, P.</creatorcontrib><creatorcontrib>Chattopadhyay, S.</creatorcontrib><creatorcontrib>Chen, H.F.</creatorcontrib><creatorcontrib>Chen, J.H.</creatorcontrib><creatorcontrib>Chen, J.Y.</creatorcontrib><creatorcontrib>Cheng, J.</creatorcontrib><creatorcontrib>Cherney, M.</creatorcontrib><creatorcontrib>Chikanian, A.</creatorcontrib><creatorcontrib>Choi, K.E.</creatorcontrib><creatorcontrib>Christie, W.</creatorcontrib><creatorcontrib>Chung, S.U.</creatorcontrib><creatorcontrib>Clarke, R.F.</creatorcontrib><creatorcontrib>Codrington, M.J.M.</creatorcontrib><creatorcontrib>Coffin, J.P.</creatorcontrib><creatorcontrib>Cormier, T.M.</creatorcontrib><creatorcontrib>Cosentino, M.R.</creatorcontrib><creatorcontrib>Cramer, J.G.</creatorcontrib><creatorcontrib>Crawford, H.J.</creatorcontrib><creatorcontrib>Das, D.</creatorcontrib><creatorcontrib>Dash, S.</creatorcontrib><creatorcontrib>Daugherity, M.</creatorcontrib><creatorcontrib>de Moura, M.M.</creatorcontrib><creatorcontrib>Dedovich, T.G.</creatorcontrib><creatorcontrib>Dephillips, M.</creatorcontrib><creatorcontrib>Derevschikov, A.A.</creatorcontrib><creatorcontrib>Derradi de Souza, R.</creatorcontrib><creatorcontrib>Didenko, L.</creatorcontrib><creatorcontrib>Dietel, T.</creatorcontrib><creatorcontrib>Djawotho, P.</creatorcontrib><creatorcontrib>Dogra, S.M.</creatorcontrib><creatorcontrib>Dong, X.</creatorcontrib><creatorcontrib>Drachenberg, J.L.</creatorcontrib><creatorcontrib>Draper, J.E.</creatorcontrib><creatorcontrib>Du, F.</creatorcontrib><creatorcontrib>Dunlop, J.C.</creatorcontrib><creatorcontrib>Dutta Mazumdar, M.R.</creatorcontrib><creatorcontrib>Edwards, W.R.</creatorcontrib><creatorcontrib>Efimov, L.G.</creatorcontrib><creatorcontrib>Elhalhuli, E.</creatorcontrib><creatorcontrib>Emelianov, V.</creatorcontrib><creatorcontrib>Engelage, J.</creatorcontrib><creatorcontrib>Eppley, G.</creatorcontrib><creatorcontrib>Erazmus, B.</creatorcontrib><creatorcontrib>Estienne, Magali</creatorcontrib><creatorcontrib>Eun, L.</creatorcontrib><creatorcontrib>Fachini, P.</creatorcontrib><creatorcontrib>Fatemi, R.</creatorcontrib><creatorcontrib>Fedorisin, J.</creatorcontrib><creatorcontrib>Feng, A.</creatorcontrib><creatorcontrib>Filip, P.</creatorcontrib><creatorcontrib>Finch, E.</creatorcontrib><creatorcontrib>Fine, V.</creatorcontrib><creatorcontrib>Fisyak, Y.</creatorcontrib><creatorcontrib>Fu, J.</creatorcontrib><creatorcontrib>Gagliardi, C.A.</creatorcontrib><creatorcontrib>Gaillard, L.</creatorcontrib><creatorcontrib>Ganti, M.S.</creatorcontrib><creatorcontrib>Garcia-Solis, E.</creatorcontrib><creatorcontrib>Ghazikhanian, V.</creatorcontrib><collection>Hyper Article en Ligne (HAL)</collection><jtitle>Physical review. C</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Abelev, B.I.</au><au>Aggarwal, M.M.</au><au>Ahammed, Z.</au><au>Anderson, B.D.</au><au>Arkhipkin, D.</au><au>Averichev, G.S.</au><au>Bai, Y.</au><au>Balewski, J.</au><au>Barannikova, O.</au><au>Barnby, L.S.</au><au>Baudot, J.</au><au>Baumgart, S.</au><au>Beavis, D.R.</au><au>Bellwied, R.</au><au>Benedosso, F.</au><au>Betts, R.R.</au><au>Bhardwaj, S.</au><au>Bhasin, A.</au><au>Bhati, A.K.</au><au>Bichsel, H.</au><au>Bielcik, J.</au><au>Bielcikova, J.</au><au>Bland, L.C.</au><au>Blyth, S.-L.</au><au>Bombara, M.</au><au>Bonner, B.E.</au><au>Botje, M.</au><au>Bouchet, J.</au><au>Braidot, E.</au><au>Brandin, A.V.</au><au>Bueltmann, S.</au><au>Burton, T.P.</au><au>Bystersky, M.</au><au>Cai, X.Z.</au><au>Caines, H.</au><au>Calderon de La Barca Sanchez, M.</au><au>Callner, J.</au><au>Catu, O.</au><au>Cebra, D.</au><au>Cervantes, M.C.</au><au>Chajecki, Z.</au><au>Chaloupka, P.</au><au>Chattopadhyay, S.</au><au>Chen, H.F.</au><au>Chen, J.H.</au><au>Chen, J.Y.</au><au>Cheng, J.</au><au>Cherney, M.</au><au>Chikanian, A.</au><au>Choi, K.E.</au><au>Christie, W.</au><au>Chung, S.U.</au><au>Clarke, R.F.</au><au>Codrington, M.J.M.</au><au>Coffin, J.P.</au><au>Cormier, T.M.</au><au>Cosentino, M.R.</au><au>Cramer, J.G.</au><au>Crawford, H.J.</au><au>Das, D.</au><au>Dash, S.</au><au>Daugherity, M.</au><au>de Moura, M.M.</au><au>Dedovich, T.G.</au><au>Dephillips, M.</au><au>Derevschikov, A.A.</au><au>Derradi de Souza, R.</au><au>Didenko, L.</au><au>Dietel, T.</au><au>Djawotho, P.</au><au>Dogra, S.M.</au><au>Dong, X.</au><au>Drachenberg, J.L.</au><au>Draper, J.E.</au><au>Du, F.</au><au>Dunlop, J.C.</au><au>Dutta Mazumdar, M.R.</au><au>Edwards, W.R.</au><au>Efimov, L.G.</au><au>Elhalhuli, E.</au><au>Emelianov, V.</au><au>Engelage, J.</au><au>Eppley, G.</au><au>Erazmus, B.</au><au>Estienne, Magali</au><au>Eun, L.</au><au>Fachini, P.</au><au>Fatemi, R.</au><au>Fedorisin, J.</au><au>Feng, A.</au><au>Filip, P.</au><au>Finch, E.</au><au>Fine, V.</au><au>Fisyak, Y.</au><au>Fu, J.</au><au>Gagliardi, C.A.</au><au>Gaillard, L.</au><au>Ganti, M.S.</au><au>Garcia-Solis, E.</au><au>Ghazikhanian, V.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>rho^0$ photoproduction in ultraperipheral relativistic heavy ion collisions at $\sqrt{S_{NN}}$=200 GeV</atitle><jtitle>Physical review. C</jtitle><date>2008</date><risdate>2008</risdate><volume>77</volume><issn>2469-9985</issn><eissn>2469-9993</eissn><abstract>Photoproduction reactions occur when the electromagnetic field of a relativistic heavy ion interacts with another heavy ion. The STAR collaboration presents a measurement of rho^0 and direct pi^+pi^- photoproduction in ultra-peripheral relativistic heavy ion collisions at sqrt(s_{NN})=200 GeV. We observe both exclusive photoproduction and photoproduction accompanied by mutual Coulomb excitation. We find a coherent cross-section of sigma(AuAu) -> Au^*Au^*rho^0 = 530 pm 19 (stat.) pm 57 (syst.) mb, in accord with theoretical calculations based on a Glauber approach, but considerably below the predictions of a color dipole model. The rho^0 transverse momentum spectrum (p_{T}^2 ) is fit by a double exponential curve including both coherent and incoherent coupling to the target nucleus; we find sigma_{inc}/sigma_{coh} = 0.29 pm 0.03 (stat.) pm 0.08 (syst.). The ratio of direct pi^+pi^- to rho^0 production is comparable to that observed in gamma p collisions at HERA, and appears to be independent of photon energy. Finally, the measured rho^0 spin helicity matrix elements agree within errors with the expected s-channel helicity conservation.</abstract><pub>American Physical Society</pub><doi>10.1103/PhysRevC.77.034910</doi><orcidid>https://orcid.org/0000-0001-9611-2004</orcidid><orcidid>https://orcid.org/0000-0001-7547-4241</orcidid><orcidid>https://orcid.org/0000-0002-4684-3121</orcidid><orcidid>https://orcid.org/0000-0002-2039-0590</orcidid><orcidid>https://orcid.org/0000-0003-1825-7907</orcidid><orcidid>https://orcid.org/0000-0001-5920-6271</orcidid><orcidid>https://orcid.org/0000-0002-2967-790X</orcidid><orcidid>https://orcid.org/0000-0002-6611-4380</orcidid><orcidid>https://orcid.org/0000-0003-0687-5580</orcidid><orcidid>https://orcid.org/0000-0001-6413-4479</orcidid><orcidid>https://orcid.org/0000-0003-3069-726X</orcidid><orcidid>https://orcid.org/0000-0003-0687-5580</orcidid><orcidid>https://orcid.org/0000-0002-6611-4380</orcidid></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 2469-9985 |
| ispartof | Physical review. C, 2008, Vol.77 |
| issn | 2469-9985 2469-9993 |
| language | eng |
| recordid | cdi_hal_primary_oai_HAL_in2p3_00269881v1 |
| source | American Physical Society Journals |
| subjects | Nuclear Experiment Physics |
| title | rho^0$ photoproduction in ultraperipheral relativistic heavy ion collisions at $\sqrt{S_{NN}}$=200 GeV |
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