Measurement of isolated-photon jet correlations with ALICE
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1 Measurement of isolated-photon jet correlations with ALICE Denise Moreira de Godoy Laboratoire de Physique Subatomique et des Technologies Associèes (SUBATECH), Nantes, France September 17, 2014 Rencontres QGP-France 2014
2 Outline Physics motivation ALICE detector Analysis strategy Preliminary results Run 2 Outlook Denise Moreira de Godoy (SUBATECH) Rencontres QGP-France 2014 September 17, / 18
3 Physics motivation: photon-jet process { quark fragments into a jet quark is recoiled by photon photon does not interact strongly with the medium (p γ T pparton T ) Phys.Rev.Lett. 96 (2006) In pp collisions: Reference for correlations in Pb-Pb and p-pb collisions Test of perturbative QCD In p-pb collisions: Study possible modifications of jet structure due to the cold nuclear matter In Pb-Pb collisions: Sensitivity to the parton in-medium energy loss Study modifications of jet structure due to final state effects Denise Moreira de Godoy (SUBATECH) Rencontres QGP-France 2014 September 17, / 18
4 Angular correlation Observables I Momentum conservation implies that isolated photons and jets from photon-jet process are correlated in azimuth: ϕ = ϕ γ ϕ jet Transverse momentum ratio The transverse momentum ratio x can be used to study the in-medium parton energy loss: x = pjet T p γ T CMS collaboration, PLB 718 (2013) Denise Moreira de Godoy (SUBATECH) Rencontres QGP-France 2014 September 17, / 18
5 Observables II Jet fragmentation function The distributions (and the properties) of jet constituents can be investigated with the jet fragmentation functions: M. Cacciari et al., arxiv: v1 pp collisions at s = 2.76 TeV, p jet T >100 GeV/c, y < 3 F z (z, p γ T ) = 1 dn part N jet dz, where z = ppart T p γ T F ξ (ξ, p γ T ) = 1 ( ) dn part 1, where ξ = ln N jet dξ z Denise Moreira de Godoy (SUBATECH) Rencontres QGP-France 2014 September 17, / 18
6 Outline Physics motivation ALICE Analysis Prelyminary Results Run 2 Outlook ALICE detector VZERO (VZEROA: 2.8 < η < 5.1; VZEROC: -3.7 < η < -1.7): - multiplicity, trigger EMCal ITS ( η < 0.9) TPC - vertexing, tracking, charged jet reconstruction ITS TPC ( η < 0.9) - tracking, charged jet reconstruction EMCal ( η < 0.7) - photon ID, trigger VZERO Denise Moreira de Godoy (SUBATECH) Rencontres QGP-France 2014 s = 7 TeV (2011) L1 EMCal triggered events Number of events: Data set: pp collisions at September 17, / 18
7 Analysis strategy 1. Reconstruct isolated photons with EMCal 2. Reconstruct charged jets with ITS+TPC 3. Correlate isolated photons to all jets in the event 4. Apply a cut in azimuth to select isolated-photon and jet pairs 5. Obtain observables Denise Moreira de Godoy (SUBATECH) Rencontres QGP-France 2014 September 17, / 18
8 Isolated-photon reconstruction Photons are selected with shower shape cut Since prompt photons from γ-jet process are produced around a little hadronic activity, isolation technique can be used to reject photons from fragmentation. The isolation is performed in a cone with radius R: (ηγ ) 2 ( ) 2 R = η j + ϕγ ϕ j where i is the i-th particle The following criteria can be used to select prompt photons: threshold on p T sum of all particles in the cone threshold on p T of each particle in the cone Ongoing isolated-photon analyzes: isolated photons in p-pb collisions at s NN = 5.02 TeV (Lucile Ronflette) and in pp collisions at s = 7 TeV (Alexis Mas / Marie Germain); isolated-photon hadron correlations in pp collisions at s = 7 TeV (Catherine Silvestre / Gustavo Conesa) Denise Moreira de Godoy (SUBATECH) Rencontres QGP-France 2014 September 17, / 18
9 Jet reconstruction: k T and anti-k T algorithms The procedure of the infrared-safe and colliniar-safe k T and anti-k T algorithms from the FastJet package (M. Cacciari et al., PLB 641 (2006) 57) consists of calculating the distance of the particle (or protojet) i with respect to a particle j (d i j ) and with respect to the beam (d ib ): ( ) R 2 d i j = min p 2k T i, p 2k i j T j R 2, where R 2 i j = ( ) 2 ( ) 2 η i η j + ϕi ϕ j d ib = p 2k T i where R is the resolution parameter, k = 1 in the k T algorithm, and k = 1 in the anti-k T algorithm. If d i j < d ib : i and j are grouped into a protojet and the procedure is restarted If d i j > d ib : i is considered as a jet and excluded from the event anti-k T algorithm is used for signal jets k T algorithm is used for background jets Denise Moreira de Godoy (SUBATECH) Rencontres QGP-France 2014 September 17, / 18
10 Jet background Background sources I Source: in presence of Underlying Events (UE), the transverse momentum of jets is increased Correction: the transverse momentum of jets can be corrected as: p corrected T jet = p reconstructed T jet ρa jet, where ρ = ( ptjet A jet ) Denise Moreira de Godoy (SUBATECH) Rencontres QGP-France 2014 September 17, / 18
11 Isolated-photon background Background sources II Source: remaining background isolated photons Correction: background contribution can be statistically subtracted: N cand. iso γ = pn meas. iso γ backg. iso γ (1 p)n where p is the purity of the measured isolated photon Isolated-photon and jet association Source: fake association between isolated-photon candidates and jets Correction: contribution should be studied at the particle level via MC simulations Fragmentation function background Source: the fragmentation function determination is affected by Underlying Events Correction: the contribution can be evaluated with association of isolated photons and a cone of particles in perpendicular direction (useful in pp collisions). Denise Moreira de Godoy (SUBATECH) Rencontres QGP-France 2014 September 17, / 18
12 Selection of isolated photons and jets Jet: anti-k T algorithm, R jet = 0.4, η < 0.5, p jet T > 15 GeV/c, ptrack T > 150 MeV/c part. in cone Isolated photon: R jet = 0.4, η < 0.3, pt < 0.5 GeV/c, p γ T > 15 GeV/c Isolated-photon and jet pairs are selected with a cut in azimuth based on photon-jet MC simulations in pp collisions at s = 7 TeV: Denise Moreira de Godoy (SUBATECH) Rencontres QGP-France 2014 September 17, / 18
13 Angular correlation in pp collisions at s = 7 TeV Denise Moreira de Godoy (SUBATECH) Rencontres QGP-France 2014 September 17, / 18
14 Transverse momentum ratio in pp collisions at s = 7 TeV Denise Moreira de Godoy (SUBATECH) Rencontres QGP-France 2014 September 17, / 18
15 Jet fragmentation functions in pp collisions at s = 7 TeV Denise Moreira de Godoy (SUBATECH) Rencontres QGP-France 2014 September 17, / 18
16 Analysis in Run 2: statistics Statistics of isolated-photon jet correlation will be significantly increased in Run 2 Estimation of correlated prompt photon in pp collisions at s = 13 TeV with Pythia isolated photons reconstructed with EMCal L int = nb 1 Denise Moreira de Godoy (SUBATECH) Rencontres QGP-France 2014 September 17, / 18
17 Analysis in Run 2: DCal Di-jet Calorimeter (DCal) is being installed in the ALICE detector EMCal PHOS DCal DCal will be used to reconstructed isolated photons ITS/TPC and EMCal will be used to reconstructed full jets Denise Moreira de Godoy (SUBATECH) Rencontres QGP-France 2014 September 17, / 18
18 Outlook Isolated-photon jet correlations have been studied in pp collisions at s = 7 TeV Statistics of isolated-photon jet correlation will be significantly increased in Run 2 ITS/TPC and EMCal will provide reconstruction of full jets and DCal will be used to reconstruct isolated photons Denise Moreira de Godoy (SUBATECH) Rencontres QGP-France 2014 September 17, / 18
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