Measurement Of Jet Radial Profiles In Pb Pb Collisions At Snn
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Author | : Shreyasi Acharya |
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Total Pages | : 0 |
Release | : 2019 |
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Download Measurement of Jet Radial Profiles in Pb-Pb Collisions at √sNN Book in PDF, Epub and Kindle
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Total Pages | : 21 |
Release | : 2014 |
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Download Modification of Jet Shapes in PbPb Collisions at $\sqrt {s_{NN}} Book in PDF, Epub and Kindle
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.
Author | : Shreyasi Acharya |
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Total Pages | : 0 |
Release | : 2018 |
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Download Medium Modification of the Shape of Small-radius Jets in Central Pb-Pb Collisions at √sNN Book in PDF, Epub and Kindle
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.
Author | : Jaroslav Adam |
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Total Pages | : 0 |
Release | : 2015 |
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Download Measurement of Jet Suppression in Central Pb-Pb Collisions at √sNN Book in PDF, Epub and Kindle
Author | : Shreyasi Acharya |
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Total Pages | : 0 |
Release | : 2021 |
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Download Measurement of the Groomed Jet Radius and Momentum Splitting Fraction in Pp and Pb-Pb Collisions at √sNN Book in PDF, Epub and Kindle
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Total Pages | : 23 |
Release | : 2015 |
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Download Measurement of Inclusive Jet Charged-particle Fragmentation Functions in Pb+Pb Collisions at \(\sqrt{s_{\mathrm{NN}}} Book in PDF, Epub and Kindle
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Total Pages | : 20 |
Release | : 2015 |
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Download Measurement of the Production of Neighbouring Jets in Lead-lead Collisions at [mml Book in PDF, Epub and Kindle
Our Letter presents measurements of correlated production of nearby jets in Pb+Pb collisions at √sNN=2.76 TeV using the ATLAS detector at the Large Hadron Collider. The measurement was performed using 0.14 nb-1 of data recorded in 2011. The production of correlated jet pairs was quantified using the rate, R[Delta]R, of "neighbouring" jets that accompany "test" jets within a given range of angular distance, [Delta]R, in the pseudorapidity-azimuthal angle plane. The jets were measured in the ATLAS calorimeter and were reconstructed using the anti-kt algorithm with radius parameters d=0.2, 0.3, and 0.4. R[Delta]R was measured in different Pb+Pb collision centrality bins, characterized by the total transverse energy measured in the forward calorimeters. A centrality dependence of R[Delta]R is observed for all three jet radii with R[Delta]R found to be lower in central collisions than in peripheral collisions. Finally, the ratios formed by the R[Delta]R values in different centrality bins and the values in the 40-80% centrality bin are presented.
Author | : Shreyasi Acharya |
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Total Pages | : 0 |
Release | : 2023 |
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Download Measurements of Jet Quenching Using Semi-inclusive Hadron+jet Distributions in Pp and Central Pb-Pb Collisions at √sNN Book in PDF, Epub and Kindle
Author | : Shreyasi Acharya |
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Total Pages | : 0 |
Release | : 2022 |
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Download Measurement of Inclusive Charged-particle B-jet Production in Pp and P-Pb Collisions at √sNN Book in PDF, Epub and Kindle
Author | : Stephen Keeton |
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Total Pages | : 158 |
Release | : 2015 |
Genre | : Heavy ion collisions |
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Download A Study of Azimuthal Z-Jet Momentum Imbalance in Monte Carlo PbPb Collisions at Sqrt(Snn) Book in PDF, Epub and Kindle
Jets have long been used as an effective probe for exploring the properties of the quark-gluon plasma (QGP) produced in high energy collisions of nuclei [1]. In heavy ion collisions some nucleons will undergo hard scattering, breaking apart and releasing their constituent high transverse momentum partons. These partons undergo hadronization due to the phenomenon of colour confinement. This is a process in which, as the constituent partons separate, the strong coupling constant increases until there is enough potential energy for it to be more energetically favourable to produce a quark-antiquark pair. This radiates more partons, predominantly collinear with their parent, forming jets of particles. As the energy of these particles decrease they will form colourless hadrons which can be detected. We set out with the aim to establish a groundwork for measuring the shape of the QGP by examining the energy loss of jets with respect to the azimuthal angle. By examining Z+jet events we aim to accurately measure the jet energy lost through jet quenching in the QGP. We expect jets which have traversed a larger distance in the QGP to lose more energy and thus an azimuthal anisotropy of jet energy loss will give us information on the shape of the produced QGP. While the latest run at the LHC did not yield many Z events from PbPb collisions [2] the next run should provide the data necessary for a complete analysis of this type. We will make use of a dijet enhanced Monte Carlo (MC) dataset in order to plan out the process and collect preliminary results.