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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Journal of High Energy Physics

ISSN

1029-8479

e-ISSN

1029-8479

Svazek periodika

2022

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

IT - Italská republika

Počet stran výsledku

43

Strana od-do

—

Kód UT WoS článku

000796518900001

EID výsledku v databázi Scopus

2-s2.0-85131875839