Centrality Dependence Of The Nuclear Modification Factor Of Charged Pions Kaons And Protons In Pb Pb Collisions At Math Mrow Msqrt Msub Mi Mi Mi Mathvariant

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Centrality Dependence Of The Nuclear Modification Factor Of Charged Pions Kaons And Protons In Pb Pb Collisions At Math Mrow Msqrt Msub Mi Mi Mi Mathvariant

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Author :
language : en
Publisher:
Release Date : 2016

Centrality Dependence Of The Nuclear Modification Factor Of Charged Pions Kaons And Protons In Pb Pb Collisions At Math Mrow Msqrt Msub Mi Mi Mi Mathvariant 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.

Here, transverse momentum (pT) spectra of pions, kaons, and protons up to pT = 20GeV/c have been measured in Pb-Pb collisions at √sNN = 2.76TeV using the ALICE detector for six different centrality classes covering 0%-80%. The proton-to-pion and the kaon-to-pion ratios both show a distinct peak at pT ≈ 3GeV/c in central Pb-Pb collisions that decreases for more peripheral collisions. For pT > 10GeV/c, the nuclear modification factor is found to be the same for all three particle species in each centrality interval within systematic uncertainties of 10%-20%. This suggests there is no direct interplay between the energy loss in the medium and the particle species composition in the hard core of the quenched jet. For pT

Centrality Dependence Of Pion Freeze Out Radii In Pb Pb Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi Mathvariant

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Author :
language : en
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Release Date : 2016

Centrality Dependence Of Pion Freeze Out Radii In Pb Pb Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi Mathvariant 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.

Here, we report on the measurement of freeze-out radii for pairs of identical-charge pions measured in Pb-Pb collisions at √sNN = 2.76 TeV as a function of collision centrality and the average transverse momentum of the pair kT. Three-dimensional sizes of the system (femtoscopic radii), as well as direction-averaged one-dimensional radii are extracted. The radii decrease with kT, following a power-law behavior. This is qualitatively consistent with expectations from a collectively expanding system, produced in hydrodynamic calculations. The radii also scale linearly with dNch/d [eta] 1/3. We compare this behavior to world data on femtoscopic radii in heavy-ion collisions. While the dependence is qualitatively similar to results at smaller √sNN, a decrease in the ratio Rout/Rside is seen, which is in qualitative agreement with a specific prediction from hydrodynamic models: a change from inside-out to outside-in freeze-out configuration. Furthermore, these results provide further evidence for the production of a collective, strongly coupled system in heavy-ion collisions at the CERN Large Hadron Collider.

Centrality Dependence Of Particle Production In Math Mi P Mi Mo Mo Mi Pb Mi Math Collisions At Math Mrow Msqrt Msub Mi Mi Mi Mathvariant

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Author :
language : en
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Release Date : 2015

Centrality Dependence Of Particle Production In Math Mi P Mi Mo Mo Mi Pb Mi Math Collisions At Math Mrow Msqrt Msub Mi Mi Mi Mathvariant 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.

Here, we report measurements of the primary charged-particle pseudorapidity density and transverse momentum distributions in p-Pb collisions at √sNN = 5.02TeV and investigate their correlation with experimental observables sensitive to the centrality of the collision. Centrality classes are defined by using different event-activity estimators, i.e., charged-particle multiplicities measured in three different pseudorapidity regions as well as the energy measured at beam rapidity (zero degree). The procedures to determine the centrality, quantified by the number of participants (Npart) or the number of nucleon-nucleon binary collisions (Ncoll) are described. We show that, in contrast to Pb-Pb collisions, in p-Pb collisions large multiplicity fluctuations together with the small range of participants available generate a dynamical bias in centrality classes based on particle multiplicity. We propose to use the zero-degree energy, which we expect not to introduce a dynamical bias, as an alternative event-centrality estimator. Based on zero-degree energy-centrality classes, the Npart dependence of particle production is studied. Under the assumption that the multiplicity measured in the Pb-going rapidity region scales with the number of Pb participants, an approximate independence of the multiplicity per participating nucleon measured at mid-rapidity of the number of participating nucleons is observed. Furthermore, at high-pT the p-Pb spectra are found to be consistent with the pp spectra scaled by Ncoll for all centrality classes. Our results represent valuable input for the study of the event-activity dependence of hard probes in p-Pb collisions and, hence, help to establish baselines for the interpretation of the Pb-Pb data.

One Dimensional Pion Kaon And Proton Femtoscopy In Pb Pb Collisions At Math Mrow Msqrt Msub Mi Mi Mi Mathvariant

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Author :
language : en
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Release Date : 2015

One Dimensional Pion Kaon And Proton Femtoscopy In Pb Pb Collisions At Math Mrow Msqrt Msub Mi Mi Mi Mathvariant 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.

The size of the particle emission region in high-energy collisions can be deduced using the femtoscopic correlations of particle pairs at low relative momentum. Such correlations arise due to quantum statistics and Coulomb and strong final state interactions. In this paper, results are presented from femtoscopic analyses of [pi]± [pi]±, K± K±, K$0\atop{S}$K$0\atop{S}$, pp, and $\overline{p}$ $\overline{p}$ correlations from Pb-Pb collisions at sNN=2.76 TeV by the ALICE experiment at the LHC. One-dimensional radii of the system are extracted from correlation functions in terms of the invariant momentum difference of the pair. The comparison of the measured radii with the predictions from a hydrokinetic model is discussed. The pion and kaon source radii display a monotonic decrease with increasing average pair transverse mass mT which is consistent with hydrodynamic model predictions for central collisions. Lastly, the kaon and proton source sizes can be reasonably described by approximate mT scaling.

Centrality Dependence Of Low Momentum Direct Photon Production In Math Mrow Mi Au Mi Mo Mo Mi Au Mi Mrow Math Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi Mathvariant

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language : en
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Release Date : 2015

Centrality Dependence Of Low Momentum Direct Photon Production In Math Mrow Mi Au Mi Mo Mo Mi Au Mi Mrow Math Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi Mathvariant 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.

The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au+Au collisions at √sNN = 200 GeV down to pT = 0.4 GeV/c. Photons are detected via photon conversions to e+e− pairs and an improved technique is applied that minimizes the systematic uncertainties that usually limit direct photon measurements, in particular at low pT . In this paper, we find an excess of direct photons above the Ncoll-scaled yield measured in p+p collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240 MeV/c in the pT range from 0.6-2.0 GeV/c. Finally, in this study, while the shape of the pT distribution is independent of centrality within the experimental uncertainties, the yield increases rapidly with increasing centrality, scaling approximately with N [alpha] part, where [alpha] = 1.38±0.03(stat)±0.07(syst).

Centrality Dependence Of High Pt D Meson Suppression In Pb Pb Collisions At Sqrt S Mathrm N Mathrm N

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Author :
language : en
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Release Date : 2015

Centrality Dependence Of High Pt D Meson Suppression In Pb Pb 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 2015 with categories.

We measured the nuclear modification factor, R-AA, of the prompt charmed mesons D°, D+ and D*+, and their antiparticles, using the ALICE detector in Pb-Pb collisions at a centre-of-mass energy √sNN = 2.76 TeV in two transverse momentum intervals, 5

Multiplicity Dependence Of Charged Pion Kaon And Anti Proton Production At Large Transverse Momentum In P Pb Collisions At Snn

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Author : Jaroslav Adam
language : en
Publisher:
Release Date : 2016

Multiplicity Dependence Of Charged Pion Kaon And Anti Proton Production At Large Transverse Momentum In P Pb Collisions At Snn written by Jaroslav Adam 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.

The production of charged pions, kaons and (anti)protons has been measured at mid-rapidity (-0.5y

Centrality Evolution Of The Charged Particle Pseudorapidity Density Over A Broad Pseudorapidity Range In Pb Pb Collisions At Mml

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Author :
language : en
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Release Date : 2016

Centrality Evolution Of The Charged Particle Pseudorapidity Density Over A Broad Pseudorapidity Range In Pb Pb Collisions At 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 2016 with categories.

The centrality dependence of the charged-particle pseudorapidity density measured with ALICE in Pb-Pb collisions at √sNN = 2.76 TeV over a broad pseudorapidity range is presented. This Letter extends the previous results reported by ALICE to more peripheral collisions. No strong change of the overall shape of charged-particle pseudorapidity density distributions with centrality is observed, and when normalised to the number of participating nucleons in the collisions, the evolution over pseudorapidity with centrality is likewise small. Broadening the pseudorapidity range (-3.5

Study Of The Production Of Charged Pions Kaons And Protons In P Pb Collisions At Sqrt S Nn

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Author :
language : en
Publisher:
Release Date : 2013

Study Of The Production Of Charged Pions Kaons And Protons In P Pb 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 2013 with categories.

Analysis Of The Apparent Nuclear Modification In Peripheral Pb Pb Collisions At 5 02 Tev

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Author : Shreyasi Acharya
language : en
Publisher:
Release Date : 2019

Analysis Of The Apparent Nuclear Modification In Peripheral Pb Pb Collisions At 5 02 Tev 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 2019 with categories.

Charged-particle spectra at midrapidity are measured in Pb-Pb collisions at the centre-of-mass energy per nucleon-nucleon pair √sNN = 5.02 TeV and presented in centrality classes ranging from most central (0-5%) to most peripheral (95-100%) collisions. Possible medium effects are quantified using the nuclear modification factor (RAA) by comparing the measured spectra with those from proton-proton collisions, scaled by the number of independent nucleon-nucleon collisions obtained from a Glauber model. At large transverse momenta (8