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Results from the first study of isolated-photon + jet correlations in relativistic heavy ion collisions are reported. The analysis uses data from PbPb collisions at a centre-of-mass energy of 2.76 TeV per nucleon pair corresponding to an integrated luminosity of 150 μb−1 recorded by the CMS experiment at the LHC. For events containing an isolated photon with transverse momentum pTγ>60 GeV/c and an associated jet with pTJet>30 GeV/c , the photon + jet pT imbalance is studied as a function of collision centrality and compared to pp data and pythia calculations at the same collision energy. Using the pTγ of the isolated photon as an estimate of the momentum of the associated parton at production, this measurement allows an unbiased characterisation of the in-medium parton energy loss. For more central PbPb collisions, a significant decrease in the ratio pTJet/pTγ relative to that in the pythia reference is observed. Furthermore, significantly more pTγ>60 GeV/c photons in PbPb are observed not to have an associated pTJet>30 GeV/c jet, compared to the reference. However, no significant broadening of the photon + jet azimuthal correlation is observed.
Studies of jet quenching using isolated-photon plus jet correlations in PbPb and pp collisions at √s(NN)=2.76 TeV
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Perloff;J. Roe;A. Safonov;T. Sakuma;S. Sengupta;I. Suarez;A. Tatarinov;D. Toback;N. Akchurin;J. Damgov;P. R. Dudero;C. Jeong;K. Kovitanggoon;S. W. Lee;T. Libeiro;Y. Roh;I. Volobouev;E. Appelt;D. Engh;C. Florez;S. Greene;A. Gurrola;W. Johns;C. Johnston;R. Kurt;C. Maguire;A. Melo;P. Sheldon;B. Snook;S. Tuo;J. Velkovska;M. W. Arenton;M. Balazs;S. Boutle;B. Cox;B. Francis;J. Goodell;R. Hirosky;A. Ledovskoy;C. Lin;C. Neu;J. Wood;R. Yohay;S. Gollapinni;R. Harr;P. E. Karchin;C. K. Kankanamge;P. Lamichhane;A. Sakharov;M. Anderson;M. Bachtis;D. Belknap;L. Borrello;D. Carlsmith;M. Cepeda;S. Dasu;L. Gray;K. S. Grogg;M. Grothe;R. Hall Wilton;M. Herndon;A. Herve;P. Klabbers;J. Klukas;A. Lanaro;C. Lazaridis;J. Leonard;R. Loveless;A. Mohapatra;I. Ojalvo;G. A. Pierro;I. Ross;A. Savin;W. H. Smith;J. Swanson
2013-01-01
Abstract
Results from the first study of isolated-photon + jet correlations in relativistic heavy ion collisions are reported. The analysis uses data from PbPb collisions at a centre-of-mass energy of 2.76 TeV per nucleon pair corresponding to an integrated luminosity of 150 μb−1 recorded by the CMS experiment at the LHC. For events containing an isolated photon with transverse momentum pTγ>60 GeV/c and an associated jet with pTJet>30 GeV/c , the photon + jet pT imbalance is studied as a function of collision centrality and compared to pp data and pythia calculations at the same collision energy. Using the pTγ of the isolated photon as an estimate of the momentum of the associated parton at production, this measurement allows an unbiased characterisation of the in-medium parton energy loss. For more central PbPb collisions, a significant decrease in the ratio pTJet/pTγ relative to that in the pythia reference is observed. Furthermore, significantly more pTγ>60 GeV/c photons in PbPb are observed not to have an associated pTJet>30 GeV/c jet, compared to the reference. However, no significant broadening of the photon + jet azimuthal correlation is observed.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/581751
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simulazione ASN
Il report seguente simula gli indicatori relativi alla propria produzione scientifica in relazione alle soglie ASN 2023-2025 del proprio SC/SSD. Si ricorda che il superamento dei valori soglia (almeno 2 su 3) è requisito necessario ma non sufficiente al conseguimento dell'abilitazione. La simulazione si basa sui dati IRIS e sugli indicatori bibliometrici alla data indicata e non tiene conto di eventuali periodi di congedo obbligatorio, che in sede di domanda ASN danno diritto a incrementi percentuali dei valori. La simulazione può differire dall'esito di un’eventuale domanda ASN sia per errori di catalogazione e/o dati mancanti in IRIS, sia per la variabilità dei dati bibliometrici nel tempo. Si consideri che Anvur calcola i valori degli indicatori all'ultima data utile per la presentazione delle domande.
La presente simulazione è stata realizzata sulla base delle specifiche raccolte sul tavolo ER del Focus Group IRIS coordinato dall’Università di Modena e Reggio Emilia e delle regole riportate nel DM 589/2018 e allegata Tabella A. Cineca, l’Università di Modena e Reggio Emilia e il Focus Group IRIS non si assumono alcuna responsabilità in merito all’uso che il diretto interessato o terzi faranno della simulazione. Si specifica inoltre che la simulazione contiene calcoli effettuati con dati e algoritmi di pubblico dominio e deve quindi essere considerata come un mero ausilio al calcolo svolgibile manualmente o con strumenti equivalenti.