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Measurement of Direct Photons inAu+AuCollisions at<sub>sNN</sub>=200GeV
Afanasiev, S.,Aidala, C.,Ajitanand, N. N.,Akiba, Y.,Al-Jamel, A.,Alexander, J.,Aoki, K.,Aphecetche, L.,Armendariz, R.,Aronson, S. H.,Averbeck, R.,Awes, T. C.,Azmoun, B.,Babintsev, V.,Baldisseri, A.,Ba American Physical Society 2012 Physical review letters Vol.109 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>
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.
Dilepton mass spectra in p+p collisions at s=200 GeV and the contribution from open charm
PHENIX Collaboration,Adare, A.,Afanasiev, S.,Aidala, C.,Ajitanand, N.N.,Akiba, Y.,Al-Bataineh, H.,Alexander, J.,Aoki, K.,Aphecetche, L.,Armendariz, R.,Aronson, S.H.,Asai, J.,Atomssa, E.T.,Averbeck, R. North-Holland Pub. Co 2009 Physics letters: B Vol.670 No.4
<P>PHENIX has measured the electron-positron pair mass spectrum from 0 to 8 GeV/c(2) in p + p collisions at root s = 200 GeV. The contributions from light meson decays to e(+)e(-) pairs have been determined based on measurements of hadron production cross sections by PHENIX. Within the systematic uncertainty of similar to 20% they account for all e(+)e(-) pairs in the mass region below similar to 1 GeV/c(2). The e(+)e(-) pair yield remaining after subtracting these contributions is dominated by semileptonic decays of charmed hadrons correlated through flavor conservation. Using the spectral shape predicted by PYTHIA, we estimate the charm production cross section to be 544 +/- 39(stat) +/- 142(syst) +/- 200(model) pb. which is consistent with QCD calculations and measurements of single leptons by PHENIX. (C) 2008 Elsevier BV. All rights reserved.</P>
Low-momentum direct-photon measurement in Cu + Cu collisions at sNN=200GeV
Adare, A.,Afanasiev, S.,Aidala, C.,Ajitanand, N. N.,Akiba, Y.,Al-Bataineh, H.,Alexander, J.,Alfred, M.,Aoki, K.,Aphecetche, L.,Armendariz, R.,Aronson, S. H.,Asai, J.,Atomssa, E. T.,Averbeck, R.,Awes, American Physical Society 2018 Physical Review C Vol.98 No.5
Charged hadron multiplicity fluctuations inAu+AuandCu+Cucollisions from<sub>sNN</sub>=22.5to 200 GeV
Adare, A.,Adler, S. S.,Afanasiev, S.,Aidala, C.,Ajitanand, N. N.,Akiba, Y.,Al-Bataineh, H.,Alexander, J.,Al-Jamel, A.,Aoki, K.,Aphecetche, L.,Armendariz, R.,Aronson, S. H.,Asai, J.,Atomssa, E. T.,Aver American Physical Society 2008 PHYSICAL REVIEW C - Vol.78 No.4
Charged-pion cross sections and double-helicity asymmetries in polarizedp+pcollisions ats=200 GeV
Adare, A.,Aidala, C.,Ajitanand, N. N.,Akiba, Y.,Akimoto, R.,Al-Ta’ani, H.,Alexander, J.,Andrews, K. R.,Angerami, A.,Aoki, K.,Apadula, N.,Appelt, E.,Aramaki, Y.,Armendariz, R.,Aschenauer, E. C.,Atomssa American Physical Society 2015 PHYSICAL REVIEW D - Vol.91 No.3