Event-by-event mean pT  Ρfluctuations in pp and Pb–Pb collisions at the LHC

B. Abelev; J. Adam; D. Adamová; MM. Aggarwal; G. Aglieri Rinella; M. Agnello; A. Agostinelli; N. Agrawal; Z. Ahammed; N. Ahmad; Ian Bearden; Hans Bøggild; Christian Holm Christensen; Jens Jørgen Gaardhøje; Kristjan Herlache Gulbrandsen; Børge Svane Nielsen; Ante Bilandzic; Alexander Colliander Hansen; Valentina Zaccolo; Marek Chojnacki

doi:10.1140/epjc/s10052-014-3077-y

Event-by-event mean p_T Ρfluctuations in pp and Pb–Pb collisions at the LHC

B. Abelev, J. Adam, D. Adamová, MM. Aggarwal, G. Aglieri Rinella, M. Agnello, A. Agostinelli, N. Agrawal, Z. Ahammed, N. Ahmad, Ian Bearden, Hans Bøggild, Christian Holm Christensen, Jens Jørgen Gaardhøje, Kristjan Herlache Gulbrandsen, Børge Svane Nielsen, Ante Bilandzic, Alexander Colliander Hansen, Valentina Zaccolo, Marek Chojnacki

Experimental Particle Physics

34 Citations (Scopus)

Abstract

Event-by-event fluctuations of the mean transverse momentum of charged particles produced in pp collisions at 0.9, 2.76 and 7 TeV, and Pb–Pb collisions at 2.76 TeV are studied as a function of the charged-particle multiplicity using the ALICE detector at the LHC. Dynamical fluctuations indicative of correlated particle emission are observed in all systems. The results in pp collisions show little dependence on collision energy. The Monte Carlo event generators PYTHIA and PHOJET are in qualitative agreement with the data. Peripheral Pb–Pb data exhibit a similar multiplicity dependence as that observed in pp. In central Pb–Pb, the results deviate from this trend, featuring a significant reduction of the fluctuation strength. The results in Pb–Pb are in qualitative agreement with previous measurements in Au–Au at lower collision energies and with expectations from models that incorporate collective phenomena.

Original language	English
Article number	3077
Journal	The European Physical Journal C: Particles and Fields
Volume	74
ISSN	1434-6044
DOIs	https://doi.org/10.1140/epjc/s10052-014-3077-y
Publication status	Published - 21 Oct 2014

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Abelev, B., Adam, J., Adamová, D., Aggarwal, MM., Aglieri Rinella, G., Agnello, M., Agostinelli, A., Agrawal, N., Ahammed, Z., Ahmad, N., Bearden, I., Bøggild, H., Christensen, C. H., Gaardhøje, J. J., Gulbrandsen, K. H., Nielsen, B. S., Bilandzic, A., Hansen, A. C., Zaccolo, V., & Chojnacki, M. (2014). Event-by-event mean p_T Ρfluctuations in pp and Pb–Pb collisions at the LHC. The European Physical Journal C: Particles and Fields, 74, [3077]. https://doi.org/10.1140/epjc/s10052-014-3077-y

Abelev, B, Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agostinelli, A, Agrawal, N, Ahammed, Z, Ahmad, N, Bearden, I , Bøggild, H , Christensen, CH , Gaardhøje, JJ , Gulbrandsen, KH , Nielsen, BS, Bilandzic, A, Hansen, AC, Zaccolo, V & Chojnacki, M 2014, 'Event-by-event mean p_T Ρfluctuations in pp and Pb–Pb collisions at the LHC', The European Physical Journal C: Particles and Fields, vol. 74, 3077. https://doi.org/10.1140/epjc/s10052-014-3077-y

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title = "Event-by-event mean pT Ρfluctuations in pp and Pb–Pb collisions at the LHC",

abstract = "Event-by-event fluctuations of the mean transverse momentum of charged particles produced in pp collisions at 0.9, 2.76 and 7 TeV, and Pb–Pb collisions at 2.76 TeV are studied as a function of the charged-particle multiplicity using the ALICE detector at the LHC. Dynamical fluctuations indicative of correlated particle emission are observed in all systems. The results in pp collisions show little dependence on collision energy. The Monte Carlo event generators PYTHIA and PHOJET are in qualitative agreement with the data. Peripheral Pb–Pb data exhibit a similar multiplicity dependence as that observed in pp. In central Pb–Pb, the results deviate from this trend, featuring a significant reduction of the fluctuation strength. The results in Pb–Pb are in qualitative agreement with previous measurements in Au–Au at lower collision energies and with expectations from models that incorporate collective phenomena.",

author = "B. Abelev and J. Adam and D. Adamov{\'a} and MM. Aggarwal and {Aglieri Rinella}, G. and M. Agnello and A. Agostinelli and N. Agrawal and Z. Ahammed and N. Ahmad and Ian Bearden and Hans B{\o}ggild and Christensen, {Christian Holm} and Gaardh{\o}je, {Jens J{\o}rgen} and Gulbrandsen, {Kristjan Herlache} and Nielsen, {B{\o}rge Svane} and Ante Bilandzic and Hansen, {Alexander Colliander} and Valentina Zaccolo and Marek Chojnacki",

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month = oct,

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doi = "10.1140/epjc/s10052-014-3077-y",

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TY - JOUR

T1 - Event-by-event mean pT Ρfluctuations in pp and Pb–Pb collisions at the LHC

AU - Abelev, B.

AU - Adam, J.

AU - Adamová, D.

AU - Aggarwal, MM.

AU - Aglieri Rinella, G.

AU - Agnello, M.

AU - Agostinelli, A.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmad, N.

AU - Bearden, Ian

AU - Bøggild, Hans

AU - Christensen, Christian Holm

AU - Gaardhøje, Jens Jørgen

AU - Gulbrandsen, Kristjan Herlache

AU - Nielsen, Børge Svane

AU - Bilandzic, Ante

AU - Hansen, Alexander Colliander

AU - Zaccolo, Valentina

AU - Chojnacki, Marek

PY - 2014/10/21

Y1 - 2014/10/21

N2 - Event-by-event fluctuations of the mean transverse momentum of charged particles produced in pp collisions at 0.9, 2.76 and 7 TeV, and Pb–Pb collisions at 2.76 TeV are studied as a function of the charged-particle multiplicity using the ALICE detector at the LHC. Dynamical fluctuations indicative of correlated particle emission are observed in all systems. The results in pp collisions show little dependence on collision energy. The Monte Carlo event generators PYTHIA and PHOJET are in qualitative agreement with the data. Peripheral Pb–Pb data exhibit a similar multiplicity dependence as that observed in pp. In central Pb–Pb, the results deviate from this trend, featuring a significant reduction of the fluctuation strength. The results in Pb–Pb are in qualitative agreement with previous measurements in Au–Au at lower collision energies and with expectations from models that incorporate collective phenomena.

AB - Event-by-event fluctuations of the mean transverse momentum of charged particles produced in pp collisions at 0.9, 2.76 and 7 TeV, and Pb–Pb collisions at 2.76 TeV are studied as a function of the charged-particle multiplicity using the ALICE detector at the LHC. Dynamical fluctuations indicative of correlated particle emission are observed in all systems. The results in pp collisions show little dependence on collision energy. The Monte Carlo event generators PYTHIA and PHOJET are in qualitative agreement with the data. Peripheral Pb–Pb data exhibit a similar multiplicity dependence as that observed in pp. In central Pb–Pb, the results deviate from this trend, featuring a significant reduction of the fluctuation strength. The results in Pb–Pb are in qualitative agreement with previous measurements in Au–Au at lower collision energies and with expectations from models that incorporate collective phenomena.

U2 - 10.1140/epjc/s10052-014-3077-y

DO - 10.1140/epjc/s10052-014-3077-y

M3 - Journal article

SN - 1434-6044

VL - 74

JO - The European Physical Journal C: Particles and Fields

JF - The European Physical Journal C: Particles and Fields

M1 - 3077

ER -

Event-by-event mean pT Ρfluctuations in pp and Pb–Pb collisions at the LHC

Abstract

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Event-by-event mean p_T Ρfluctuations in pp and Pb–Pb collisions at the LHC