Jet quenching in pp and pA collisions

Захаров, Б. Г.

doi:10.1063/1.4938664

Cited by 2 publications

(2 citation statements)

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“…[25] for a recent review). The question arises whether the conditions created in high-multiplicity pp collisions can also modify, as in AA [26,27], the yields of hard probes, for example through partonic energy loss [28]. Hence, the study of hard processes as a function of the charged-particle number-density has moved into the focus of interest.…”

Section: Jhep04(2020)192mentioning

confidence: 99%

Underlying event properties in pp collisions at $$ \sqrt{s} $$ = 13 TeV

Acharya¹,

Adamová²,

Adler³

et al. 2020

J. High Energ. Phys.

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This article reports measurements characterizing the Underlying Event (UE) associated with hard scatterings at midrapidity (|η| < 0.8) in pp collisions at √ s = 13 TeV. The hard scatterings are identified by the leading particle, the charged particle with the highest transverse momentum (p leading T) in the event. Charged-particle number-densities and summed transverse-momentum densities are measured in different azimuthal regions defined with respect to the leading particle direction: Toward, Transverse, and Away. The Toward and Away regions contain the fragmentation products of the hard scatterings in addition to the UE contribution, whereas particles in the Transverse region are expected to originate predominantly from the UE. The study is performed as a function of p leading T with three different p T thresholds for the associated particles, p track T > 0.15, 0.5, and 1.0 GeV/c. The charged-particle density in the Transverse region rises steeply for low values of p leading T and reaches a plateau. The results confirm the trend that the charged-particle density in the Transverse region shows a stronger increase with √ s than the inclusive charged-particle density at midrapidity. The UE activity is increased by approximately 20% when going from 7 TeV to 13 TeV pp collisions. The plateau in the Transverse region (5 < p leading T < 40 GeV/c) is further characterized by the probability distribution of its charged-particle multiplicity normalized to its average value (relative transverse activity, R T) and the mean transverse momentum as a function of R T. Experimental results are compared to model calculations using PYTHIA 8 and EPOS LHC. The overall agreement between models and data is within 30%. These measurements provide new insights on the interplay between hard scatterings and the associated UE in pp collisions.

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Section: Jhep04(2020)192mentioning

confidence: 99%

Underlying event properties in pp collisions at $$ \sqrt{s} $$ = 13 TeV

Acharya¹,

Adamová²,

Adler³

et al. 2020

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…From the experimental point of view, several signatures considered proofs of collective effects in heavy-ion collisions have been observed in the small systems created in pp and pA collisions [1]. Such a development has important consequences for the analysis of AA data [2][3][4] because one should take into account the contribution of the QGP-like effects in pp when comparing with AA. Recently, new ideas have been investigated to understand the effects in high multiplicity pp collisions.…”

Section: Introductionmentioning

confidence: 99%