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PHENIX Collaboration,Afanasiev, S.,Aidala, C.,Ajitanand, N.N.,Akiba, Y.,Alexander, J.,Al-Jamel, A.,Aoki, K.,Aphecetche, L.,Armendariz, R.,Aronson, S.H.,Averbeck, R.,Awes, T.C.,Azmoun, B.,Babintsev, V. North-Holland Pub. Co 2009 Physics letters: B Vol.679 No.4
We present the first measurement of photoproduction of J/ψ and of two-photon production of high-mass e<SUP>+</SUP>e<SUP>-</SUP> pairs in electromagnetic (or ultra-peripheral) nucleus-nucleus interactions, using Au+Au data at s<SUB>NN</SUB>=200 GeV. The events are tagged with forward neutrons emitted following Coulomb excitation of one or both Au<SUP>@</SUP>? nuclei. The event sample consists of 28 events with m<SUB>e<</SUB>SUP><SUB><</SUB>/SUP>+<SUB>e<</SUB>SUP><SUB><</SUB>/SUP>->2 GeV/c<SUP>2</SUP> with zero like-sign background. The measured cross sections at midrapidity of dσ/dy(J/ψ+Xn,y=0)=76+/-33(stat)+/-11(syst) μb and d<SUP>2</SUP>σ/dmdy(e<SUP>+</SUP>e<SUP>-</SUP>+Xn,y=0)=86+/-23(stat)+/-16(syst) μb/(GeV/c<SUP>2</SUP>) for m<SUB>e<</SUB>SUP><SUB><</SUB>/SUP>+<SUB>e<</SUB>SUP><SUB><</SUB>/SUP>-@?[2.0,2.8] GeV/c<SUP>2</SUP> have been compared and found to be consistent with models for photoproduction of J/ψ and QED based calculations of two-photon production of e<SUP>+</SUP>e<SUP>-</SUP> pairs.
High- p_{T} charged hadron suppression in Au+Au collisions at sqrt[s_{NN}]=200GeV
Adler, S. S.,Afanasiev, S.,Aidala, C.,Ajitanand, N. N.,Akiba, Y.,Alexander, J.,Amirikas, R.,Aphecetche, L.,Aronson, S. H.,Averbeck, R.,Awes, T. C.,Azmoun, R.,Babintsev, V.,Baldisseri, A.,Barish, K. N. American Physical Society 2004 PHYSICAL REVIEW C - Vol.69 No.3
Bose-Einstein Correlations of Charged Pion Pairs inAu+AuCollisions atsNN=200 GeV
Adler, S. S.,Afanasiev, S.,Aidala, C.,Ajitanand, N. N.,Akiba, Y.,Alexander, J.,Amirikas, R.,Aphecetche, L.,Aronson, S. H.,Averbeck, R.,Awes, T. C.,Azmoun, R.,Babintsev, V.,Baldisseri, A.,Barish, K. N. American Physical Society 2004 Physical Review Letters Vol.93 No.15
Charged Kaon Interferometric Probes of Space-Time Evolution inAu+AuCollisions atsNN=200 GeV
Afanasiev, S.,Aidala, C.,Ajitanand, N. N.,Akiba, Y.,Alexander, J.,Al-Jamel, A.,Aoki, K.,Aphecetche, L.,Armendariz, R.,Aronson, S. H.,Averbeck, R.,Awes, T. C.,Azmoun, B.,Babintsev, V.,Baldisseri, A.,Ba American Physical Society 2009 Physical Review Letters Vol.103 No.14
<P>Bose-Einstein correlations of charged kaons are used to probe Au+Au collisions at sqrt[S(NN)]=200 GeV and are compared to charged pion probes, which have a larger hadronic scattering cross section. Three-dimensional Gaussian source radii are extracted, along with a one-dimensional kaon emission source function. The centrality dependences of the three Gaussian radii are well described by a single linear function of N(part)1/3 with a zero intercept. Imaging analysis shows a deviation from a Gaussian tail at r greater than or approximately equal to 10 fm, although the bulk emission at lower radius is well described by a Gaussian. The presence of a non-Gaussian tail in the kaon source reaffirms that the particle emission region in a heavy-ion collision is extended, and that similar measurements with pions are not solely due to the decay of long-lived resonances.</P>
Dielectron production in Au + Au collisions at<sub>sNN</sub>=200GeV
Adare, A.,Aidala, C.,Ajitanand, N. N.,Akiba, Y.,Akimoto, R.,Alexander, J.,Alfred, M.,Al-Ta'ani, H.,Angerami, A.,Aoki, K.,Apadula, N.,Aramaki, Y.,Asano, H.,Aschenauer, E. C.,Atomssa, E. T.,Averbeck, R. American Physical Society 2016 Physical review. C Vol.93 No.1
Centrality dependence of subthresholdϕmeson production in Ni + Ni collisions at1.9AGeV
Piasecki, K.,Tymiń,ski, Z.,Herrmann, N.,Averbeck, R.,Andronic, A.,Barret, V.,Basrak, Z.,Bastid, N.,Benabderrahmane, M. L.,Berger, M.,Buehler, P.,Cargnelli, M.,Č,aplar, R.,Cordier, E.,Crochet American Physical Society 2016 Physical Review C Vol.94 No.1
<P>We analyzed the phi meson production in central Ni + Ni collisions at a beam kinetic energy of 1.93A GeV with the FOPI spectrometer and found a production probability per event of [8.6 +/- 1.6(stat) +/- 1.5(syst)] x 10(-4). This new data point allows us for the first time to inspect the centrality dependence of subthreshold phi meson production in heavy-ion collisions. The rise of phi meson multiplicity per event with mean number of participants can be parametrized by a power function with exponent alpha = 1.8 +/- 0.6. The ratio of phi to K- production yields seems not to depend, within the experimental uncertainties, on the collision centrality, and the average of measured values was found to be 0.36 +/- 0.05.</P>