First measurement of large area jet transverse momentum spectra in heavy-ion collisions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10455603" target="_blank" >RIV/00216208:11320/21:10455603 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=zmMSVuOOHZ" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=zmMSVuOOHZ</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP05(2021)284" target="_blank" >10.1007/JHEP05(2021)284</a>

Jazyk výsledku

angličtina

Název v původním jazyce

First measurement of large area jet transverse momentum spectra in heavy-ion collisions

Popis výsledku v původním jazyce

Jet production in lead-lead (PbPb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of 5.02TeV is studied with the CMS detector at the LHC, using PbPb and pp data samples corresponding to integrated luminosities of 404 mu b(-1) and 27.4 pb(-1), respectively. Jets with different areas are reconstructed using the anti-k(T) algorithm by varying the distance parameter R. The measurements are performed using jets with transverse momenta (p(T)) greater than 200 GeV and in a pseudorapidity range of vertical bar eta vertical bar &lt; 2. To reveal the medium modification of the jet spectra in PbPb collisions, the properly normalized ratio of spectra from PbPb and pp data is used to extract jet nuclear modification factors as functions of the PbPb collision centrality, p(T) and, for the first time, as a function of R up to 1.0. For the most central collisions, a strong suppression is observed for high-p(T) jets reconstructed with all distance parameters, implying that a significant amount of jet energy is scattered to large angles. The dependence of jet suppression on R is expected to be sensitive to both the jet energy loss mechanism and the medium response, and so the data are compared to several modern event generators and analytic calculations. The models considered do not fully reproduce the data.

Název v anglickém jazyce

First measurement of large area jet transverse momentum spectra in heavy-ion collisions

Popis výsledku anglicky

Jet production in lead-lead (PbPb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of 5.02TeV is studied with the CMS detector at the LHC, using PbPb and pp data samples corresponding to integrated luminosities of 404 mu b(-1) and 27.4 pb(-1), respectively. Jets with different areas are reconstructed using the anti-k(T) algorithm by varying the distance parameter R. The measurements are performed using jets with transverse momenta (p(T)) greater than 200 GeV and in a pseudorapidity range of vertical bar eta vertical bar &lt; 2. To reveal the medium modification of the jet spectra in PbPb collisions, the properly normalized ratio of spectra from PbPb and pp data is used to extract jet nuclear modification factors as functions of the PbPb collision centrality, p(T) and, for the first time, as a function of R up to 1.0. For the most central collisions, a strong suppression is observed for high-p(T) jets reconstructed with all distance parameters, implying that a significant amount of jet energy is scattered to large angles. The dependence of jet suppression on R is expected to be sensitive to both the jet energy loss mechanism and the medium response, and so the data are compared to several modern event generators and analytic calculations. The models considered do not fully reproduce the data.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10300 - Physical sciences

Projekt

<a href="/cs/project/LG14004" target="_blank" >LG14004: Spolupráce ČR s SÚJV Dubna v teoretické a jaderné fyzice a při využití jaderných metod v dalších oborech</a><br>

Návaznosti

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

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Journal of High Energy Physics [online]

ISSN

1029-8479

e-ISSN

—

Svazek periodika

2021

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

48

Strana od-do

284

Kód UT WoS článku

000762406800001

EID výsledku v databázi Scopus

2-s2.0-85107771526