Measurements of the groomed and ungroomed jet angularities in pp collisions at root s=5.02 TeV

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F22%3A00363957" target="_blank" >RIV/68407700:21340/22:00363957 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1007/JHEP05(2022)061" target="_blank" >https://doi.org/10.1007/JHEP05(2022)061</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP05(2022)061" target="_blank" >10.1007/JHEP05(2022)061</a>

Result language

angličtina

Original language name

Measurements of the groomed and ungroomed jet angularities in pp collisions at root s=5.02 TeV

Original language description

The jet angularities are a class of jet substructure observables which characterize the angular and momentum distribution of particles within jets. These observables are sensitive to momentum scales ranging from perturbative hard scatterings to nonperturbative fragmentation into final-state hadrons. We report measurements of several groomed and ungroomed jet angularities in pp collisions at root s = 5.02 TeV with the ALICE detector. Jets are reconstructed using charged particle tracks at midrapidity (vertical bar eta vertical bar< 0.9). The anti-k(T) algorithm is used with jet resolution parameters R = 0.2 and R = 0.4 for several transverse momentum p(T)(ch jet) intervals in the 20-100 GeV/c range. Using the jet grooming algorithm Soft Drop, the sensitivity to softer, wide-angle processes, as well as the underlying event, can be reduced in a way which is well-controlled in theoretical calculations. We report the ungroomed jet angularities, lambda(alpha), and groomed jet angularities, lambda(alpha,g), to investigate the interplay between perturbative and nonperturbative effects at low jet momenta. Various angular exponent parameters alpha = 1, 1.5, 2, and 3 are used to systematically vary the sensitivity of the observable to collinear and soft radiation. Results are compared to analytical predictions at next-to-leading-logarithmic accuracy, which provide a generally good description of the data in the perturbative regime but exhibit discrepancies in the nonperturbative regime. Moreover, these measurements serve as a baseline for future ones in heavy-ion collisions by providing new insight into the interplay between perturbative and nonperturbative effects in the angular and momentum substructure of jets. They supply crucial guidance on the selection of jet resolution parameter, jet transverse momentum, and angular scaling variable for jet quenching studies.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10303 - Particles and field physics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of High Energy Physics

ISSN

1029-8479

e-ISSN

1029-8479

Volume of the periodical

2022

Issue of the periodical within the volume

5

Country of publishing house

IT - ITALY

Number of pages

43

Pages from-to

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UT code for WoS article

000796518900001

EID of the result in the Scopus database

2-s2.0-85131875839