In Medium Modification Of Dijets In Pbpb Collisions At Snn
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In Medium Modification Of Dijets In Pbpb Collisions At Snn
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Author : Albert M. Sirunyan
language : en
Publisher:
Release Date : 2021
In Medium Modification Of Dijets In Pbpb Collisions At Snn written by Albert M. Sirunyan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Cern Courier
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Author :
language : en
Publisher:
Release Date : 2014
Cern Courier written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Nuclear energy categories.
Modification Of Jet Shapes In Pbpb Collisions At Sqrt S Nn
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Author :
language : en
Publisher:
Release Date : 2014
Modification Of Jet Shapes In Pbpb Collisions At Sqrt S Nn written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
The first measurement of jet shapes, defined as the fractional transverse momentum radial distribution, for inclusive jets produced in heavy-ion collisions is presented. Data samples of PbPb and pp collisions, corresponding to integrated luminosities of 150 inverse microbarns and 5.3 inverse picobarns respectively, were collected at a nucleon-nucleon centre-of-mass energy of sqrt(s[NN]) = 2.76 TeV with the CMS detector at the LHC. The jets are reconstructed with the anti-kt algorithm with a distance parameter R=0.3, and the jet shapes are measured for charged particles with transverse momentum pt> 1 GeV. The jet shapes measured in PbPb collisions in different collision centralities are compared to reference distributions based on the pp data. A centrality-dependent modification of the jet shapes is observed in the more central PbPb collisions, indicating a redistribution of the energy inside the jet cone. This measurement provides information about the parton shower mechanism in the hot and dense medium produced in heavy-ion collisions.
Properties Of Dijets In Pp Ppb And Pbpb Collisions
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Author : Doga Can Gulhan
language : en
Publisher:
Release Date : 2016
Properties Of Dijets In Pp Ppb And Pbpb Collisions written by Doga Can Gulhan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Two dijet measurements, one using 35 pb-1 pPb data at [square root]sNN- 5.02 TeV, and another with 166 [mu]b-1 PbPb and 5.3 pb-1 pp data at [square root]sNN = 2.76 TeV collected with CMS detector at the LHC, are presented. In pPb collisions, the dijet PT ratios, azimuthal angle differences and pseudorapidity distributions are measured and compared to PYTHIA and PYTHIA+HIJING simulations as well as NLO QCD predictions for the latter observable. No significant signs of final state interactions, such as a decrease in the mean dijet PT ratios or a broadening in the correlation of the dijets in azimuthal angle, with increasing forward activity, are observed. The dijet pseudorapidity distributions are also measured, and are sensitive to nuclear PDFs for x values of 0.001 - 0.5. Selections on event activity are found to yield unexpected centrality biases on dijet pseudorapidity distributions, which aided the interpretation of similar biases seen in inclusive jet measurements by ATLAS. In PbPb collisions, a detailed scan of charged particle distributions in correlation with the dijet system is carried out. The PT projection of charged particles on the dijet axis is measured at different distances of [delta] = [mathematical formula ...] 2 with respect to the leading and subleading jet axes. In this way, the spectra and angular distribution of the additional particles, which recover the overall event balance in dijet events with enhanced PT asymmetry in PbPb compared to pp collisions, are obtained up to [delta] = 1.8 in steps of 0.2. A significant excess of low PT particles associated with a subleading jet at large [delta] values is observed, and this excess is shown to get larger for dijet events with PT asymmetry. The scan is carried out for variety of anti-kT R parameters, which provides a way of varying jet width and fragmentation. Medium response to jet quenching at wide angles for jets with different fragmentation is studied. Only an insignificant increase of the magnitude of low PT particle excess at large angles, but a significant increase in the modification of the balance distribution close to the jet axes is observed by increasing R.
Correlations Between Jets And Charged Particles In Pbpb And Pp Collisions At Sqrt S Mathrm Nn
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Author :
language : en
Publisher:
Release Date : 2016
Correlations Between Jets And Charged Particles In Pbpb And Pp Collisions At Sqrt S Mathrm Nn written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
In this study, the quark-gluon plasma is studied via medium-induced changes to correlations between jets and charged particles in PbPb collisions compared to pp reference data. This analysis uses data sets from PbPb and pp collisions with integrated luminosities of 166 inverse microbarns and 5.3 inverse picobarns, respectively, collected at $ \sqrt{s_{\mathrm{NN}}}=2.76 $ TeV. The angular distributions of charged particles are studied as a function of relative pseudorapidity ([Delta][eta]) and relative azimuthal angle ([Delta][Phi]) with respect to reconstructed jet directions. Charged particles are correlated with all jets with transverse momentum (pT) above 120 GeV, and with the leading and subleading jets (the highest and second-highest in pT, respectively) in a selection of back-to-back dijet events. Modifications in PbPb data relative to pp reference data are characterized as a function of PbPb collision centrality and charged particle pT. A centrality-dependent excess of low-pT particles is present for all jets studied, and is most pronounced in the most central events. This excess of low-pT particles follows a Gaussian-like distribution around the jet axis, and extends to large relative angles of [Delta][eta] ≈ 1 and [Delta][Phi] ≈ 1.
Medium Modification Of The Shape Of Small Radius Jets In Central Pb Pb Collisions At Snn
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Author : Shreyasi Acharya
language : en
Publisher:
Release Date : 2018
Medium Modification Of The Shape Of Small Radius Jets In Central Pb Pb Collisions At Snn written by Shreyasi Acharya and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
We present the measurement of a new set of jet shape observables for track-based jets in central Pb-Pb collisions at sNN---√=2.76 TeV. The set of jet shapes includes the first radial moment or angularity, g; the momentum dispersion, pTD; and the difference between the leading and sub-leading constituent track transverse momentum, LeSub. These observables provide complementary information on the jet fragmentation and can constrain different aspects of the theoretical description of jet-medium interactions. The jet shapes were measured for a small resolution parameter R = 0.2 and were fully corrected to particle level. The observed jet shape modifications indicate that in-medium fragmentation is harder and more collimated than vacuum fragmentation as obtained by PYTHIA calculations, which were validated with the measurements of the jet shapes in proton-proton collisions at s√=7 TeV. The comparison of the measured distributions to templates for quark and gluon-initiated jets indicates that in-medium fragmentation resembles that of quark jets in vacuum. We further argue that the observed modifications are not consistent with a totally coherent energy loss picture where the jet loses energy as a single colour charge, suggesting that the medium resolves the jet structure at the angular scales probed by our measurements (R = 0.2). Furthermore, we observe that small-R jets can help to isolate purely energy loss effects from other effects that contribute to the modifications of the jet shower in medium such as the correlated background or medium response.
Decomposing Transverse Momentum Balance Contributions For Quenched Jets In Pbpb Collisions At Sqrt S Mathrm N Mathrm N
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Author :
language : en
Publisher:
Release Date : 2016
Decomposing Transverse Momentum Balance Contributions For Quenched Jets In Pbpb Collisions At Sqrt S Mathrm N Mathrm N written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Interactions between jets and the quark-gluon plasma produced in heavy ion collisions are studied via the angular distributions of summed charged-particle transverse momenta (pT) with respect to both the leading and subleading jet axes in high-pt dijet events. The contributions of charged particles in different momentum ranges to the overall event pt balance are decomposed into short-range jet peaks and a long-range azimuthal asymmetry in charged-particle pT. The results for PbPb collisions are compared to those in pp collisions using data collected in 2011 and 2013, at collision energy $ \sqrt{s_{\mathrm{N}\;\mathrm{N}}}=2.76 $ TeV with integrated luminosities of 166 [mu]b-1 and 5.3 pb-1, respectively, by the CMS experiment at the LHC. Furthermore, measurements are presented as functions of PbPb collision centrality, charged-particle pt, relative azimuth, and radial distance from the jet axis for balanced and unbalanced dijets.
Measurement Of Dijet Mml
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Author :
language : en
Publisher:
Release Date : 2015
Measurement Of Dijet Mml written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
A measurement of dijet correlations in p-Pb collisions at √sNN = 5.02 TeV with the ALICE detector is presented. Jets are reconstructed from charged particles measured in the central tracking detectors and neutral energy deposited in the electromagnetic calorimeter. The transverse momentum of the full jet (clustered from charged and neutral constituents) and charged jet (clustered from charged particles only) is corrected event-by-event for the contribution of the underlying event, while corrections for underlying event fluctuations and finite detector resolution are applied on an inclusive basis. A projection of the dijet transverse momentum, kTy = pT,jetch+nesin([Delta][phi]dijet) with [Delta][phi]dijet the azimuthal angle between a full and charged jet and pT,jetch+ne the transverse momentum of the full jet, is used to study nuclear matter effects in p-Pb collisions. This observable is sensitive to the acoplanarity of dijet production and its potential modification in p-Pb collisions with respect to pp collisions. Here, measurements of the dijet kTy as a function of the transverse momentum of the full and recoil charged jet, and the event multiplicity are presented. No significant modification of kTy due to nuclear matter effects in p-Pb collisions with respect to the event multiplicity or a PYTHIA8 reference is observed.
Measurement Of Inclusive Jet Production And Nuclear Modifications In Ppb Collisions At Sqrt S Mathrm Nn
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Author :
language : en
Publisher:
Release Date : 2016
Measurement Of Inclusive Jet Production And Nuclear Modifications In Ppb Collisions At Sqrt S Mathrm Nn written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Inclusive jet production in pPb collisions at a nucleon-nucleon (NN) center-of-mass energy of sqrt(s[NN])=5.02 TeV is studied with the CMS detector at the LHC. A data sample corresponding to an integrated luminosity of 35 inverse nanobarns is analyzed. The jet transverse momentum spectra are studied in seven pseudorapidity intervals covering the range -2.0
Observation Of Medium Induced Yield Enhancement And Acoplanarity Broadening Of Low Pt Jets From Measurements In Pp And Central Pb Pb Collisions At Snn
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Author : Shreyasi Acharya
language : en
Publisher:
Release Date : 2023
Observation Of Medium Induced Yield Enhancement And Acoplanarity Broadening Of Low Pt Jets From Measurements In Pp And Central Pb Pb Collisions At Snn written by Shreyasi Acharya and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.