Direct photon production in Pb–Pb collisions at √sNN = 2.76 TeV

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dc.contributor.authorAdam, J
dc.contributor.authorAdamová, D
dc.contributor.authorAggarwal, M M
dc.contributor.authorAglieri Rinella, G
dc.contributor.authorAgnello, M
dc.contributor.authorAgrawal, N
dc.contributor.authorAhammed, Z
dc.contributor.authorAhn, S U
dc.contributor.authorAiola, S
dc.contributor.authorAkindinov, A
dc.contributor.authorAlam, S N
dc.contributor.authorAleksandrov, D
dc.contributor.authorAlessandro, B
dc.contributor.authorAlexandre, D
dc.contributor.authorAlfaro Molina, R
dc.contributor.authorAlici, A
dc.contributor.authorAlkin, A
dc.contributor.authorAlmaraz, J R M
dc.contributor.authorAlme, J
dc.contributor.authorAlt, T
dc.contributor.authorAltinpinar, S
dc.contributor.authorAltsybeev, I
dc.contributor.authorAlves Garcia Prado, C
dc.contributor.authorAndrei, C
dc.contributor.authorAndronic, A
dc.contributor.authorAnguelov, V
dc.contributor.authorAnielski, J
dc.contributor.authorAntičić, T
dc.contributor.authorAntinori, F
dc.contributor.authorAntonioli, P
dc.contributor.authorAphecetche, L
dc.contributor.authorAppelshäuser, H
dc.date.accessioned2021-10-08T07:11:46Z
dc.date.available2021-10-08T07:11:46Z
dc.date.issued2016
dc.description.abstractDirect photon production at mid-rapidity in Pb–Pb collisions at √sNN = 2.76 TeV was studied in the transverse momentum range 0.9 < pT < 14 GeV/c. Photons were detected with the highly segmented electromagnetic calorimeter PHOS and via conversions in the ALICE detector material with the e+e− pair reconstructed in the central tracking system. The results of the two methods were combined and direct photon spectra were measured for the 0–20%, 20–40%, and 40–80% centrality classes. For all three classes, agreement was found with perturbative QCD calculations for pT 5 GeV/c. Direct photon spectra down to pT ≈ 1 GeV/c could be extracted for the 20–40% and 0–20% centrality classes. The significance of the direct photon signal for 0.9 < pT < 2.1 GeV/c is 2.6σ for the 0–20% class. The spectrum in this pT range and centrality class can be described by an exponential with an inverse slope parameter of (297 ± 12stat ± 41syst) MeV. State-of-the-art models for photon production in heavy-ion collisions agree with the data within uncertainties.
dc.identifier.apacitationAdam, J., Adamová, D., Aggarwal, M. M., Aglieri Rinella, G., Agnello, M., Agrawal, N., ... Appelshäuser, H. (2016). Direct photon production in Pb–Pb collisions at √sNN = 2.76 TeV. <i>Physics Letters, B</i>, 754(C), 235 - 248. http://hdl.handle.net/11427/34683en_ZA
dc.identifier.chicagocitationAdam, J, D Adamová, M M Aggarwal, G Aglieri Rinella, M Agnello, N Agrawal, Z Ahammed, et al "Direct photon production in Pb–Pb collisions at √sNN = 2.76 TeV." <i>Physics Letters, B</i> 754, C. (2016): 235 - 248. http://hdl.handle.net/11427/34683en_ZA
dc.identifier.citationAdam, J., Adamová, D., Aggarwal, M.M., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z. & Ahn, S.U. et al. 2016. Direct photon production in Pb–Pb collisions at √sNN = 2.76 TeV. <i>Physics Letters, B.</i> 754(C):235 - 248. http://hdl.handle.net/11427/34683en_ZA
dc.identifier.issn0370-2693
dc.identifier.issn1873-2445
dc.identifier.ris TY - Journal Article AU - Adam, J AU - Adamová, D AU - Aggarwal, M M AU - Aglieri Rinella, G AU - Agnello, M AU - Agrawal, N AU - Ahammed, Z AU - Ahn, S U AU - Aiola, S AU - Akindinov, A AU - Alam, S N AU - Aleksandrov, D AU - Alessandro, B AU - Alexandre, D AU - Alfaro Molina, R AU - Alici, A AU - Alkin, A AU - Almaraz, J R M AU - Alme, J AU - Alt, T AU - Altinpinar, S AU - Altsybeev, I AU - Alves Garcia Prado, C AU - Andrei, C AU - Andronic, A AU - Anguelov, V AU - Anielski, J AU - Antičić, T AU - Antinori, F AU - Antonioli, P AU - Aphecetche, L AU - Appelshäuser, H AB - Direct photon production at mid-rapidity in Pb–Pb collisions at √sNN = 2.76 TeV was studied in the transverse momentum range 0.9 < pT < 14 GeV/c. Photons were detected with the highly segmented electromagnetic calorimeter PHOS and via conversions in the ALICE detector material with the e+e− pair reconstructed in the central tracking system. The results of the two methods were combined and direct photon spectra were measured for the 0–20%, 20–40%, and 40–80% centrality classes. For all three classes, agreement was found with perturbative QCD calculations for pT 5 GeV/c. Direct photon spectra down to pT ≈ 1 GeV/c could be extracted for the 20–40% and 0–20% centrality classes. The significance of the direct photon signal for 0.9 < pT < 2.1 GeV/c is 2.6σ for the 0–20% class. The spectrum in this pT range and centrality class can be described by an exponential with an inverse slope parameter of (297 ± 12stat ± 41syst) MeV. State-of-the-art models for photon production in heavy-ion collisions agree with the data within uncertainties. DA - 2016 DB - OpenUCT DP - University of Cape Town IS - C J1 - Physics Letters, B LK - https://open.uct.ac.za PY - 2016 SM - 0370-2693 SM - 1873-2445 T1 - Direct photon production in Pb–Pb collisions at √sNN = 2.76 TeV TI - Direct photon production in Pb–Pb collisions at √sNN = 2.76 TeV UR - http://hdl.handle.net/11427/34683 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34683
dc.identifier.vancouvercitationAdam J, Adamová D, Aggarwal MM, Aglieri Rinella G, Agnello M, Agrawal N, et al. Direct photon production in Pb–Pb collisions at √sNN = 2.76 TeV. Physics Letters, B. 2016;754(C):235 - 248. http://hdl.handle.net/11427/34683.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Physics
dc.publisher.facultyFaculty of Science
dc.sourcePhysics Letters, B
dc.source.journalissueC
dc.source.journalvolume754
dc.source.pagination235 - 248
dc.source.urihttps://dx.doi.org/10.1016/j.physletb.2016.01.020
dc.subject.otherQuark-Gluon Plasma
dc.subject.otherNucleus-Nucleus Collisions
dc.subject.otherEquation-Of-State
dc.subject.otherTransverse-Momentum
dc.subject.otherThermal Photons
dc.subject.otherLeading Order
dc.subject.otherNeutral Pion
dc.subject.otherFragmentation
dc.subject.otherCollaboration
dc.subject.otherPerspective
dc.subject.otherArticle
dc.titleDirect photon production in Pb–Pb collisions at √sNN = 2.76 TeV
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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