Underlying event properties in pp collisions at root s=13 TeV
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F20%3A00524544" target="_blank" >RIV/61389005:_____/20:00524544 - isvavai.cz</a>
Alternative codes found
RIV/68378271:_____/20:00524544 RIV/68407700:21340/20:00342805
Result on the web
<a href="https://doi.org/10.1007/JHEP04(2020)192" target="_blank" >https://doi.org/10.1007/JHEP04(2020)192</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/JHEP04(2020)192" target="_blank" >10.1007/JHEP04(2020)192</a>
Alternative languages
Result language
angličtina
Original language name
Underlying event properties in pp collisions at root s=13 TeV
Original language description
This article reports measurements characterizing the Underlying Event (UE) associated with hard scatterings at midrapidity (|eta| < 0.8) in pp collisions at root s = 13 TeV. The hard scatterings are identified by the leading particle, the charged particle with the highest transverse momentum (pT leading) 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 pT leading with three different p(T) thresholds for the associated particles, pT track > 0.15, 0.5, and 1.0 GeV/c. The charged-particle density in the Transverse region rises steeply for low values of pT leading 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 <pT leading< 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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10304 - Nuclear physics
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of High Energy Physics
ISSN
1029-8479
e-ISSN
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Volume of the periodical
2020
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
35
Pages from-to
192
UT code for WoS article
000531322300001
EID of the result in the Scopus database
2-s2.0-85084153927