Measurement of the polarizations of prompt and non-prompt J/ψ and ψ(2S) mesons produced in pp collisions at √s=13 TeV

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10493356" target="_blank" >RIV/00216208:11320/24:10493356 - isvavai.cz</a>

Výsledek na webu

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

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physletb.2024.139044" target="_blank" >10.1016/j.physletb.2024.139044</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Measurement of the polarizations of prompt and non-prompt J/ψ and ψ(2S) mesons produced in pp collisions at √s=13 TeV

Popis výsledku v původním jazyce

The polarizations of prompt and non-prompt J/psi and psi(2S) mesons are measured in proton-proton collisions at root s = 13TeV, using data samples collected by the CMS experiment in 2017 and 2018, corresponding to a total integrated luminosity of 103.3 fb(-1). Based on the analysis of the dimuon decay angular distributions in the helicity frame, the polar anisotropy, lambda(theta), is measured as a function of the transverse momentum, p(T), of the charmonium states, in the 25-120 and 20-100GeV ranges for the J/psi and psi(2S), respectively. The non-prompt polarizations agree with predictions based on the hypothesis that, for p(T) greater than or similar to 25 GeV, the non-prompt J/psi and psi(2S) are predominantly produced in two-body B meson decays. The prompt results clearly exclude strong transverse polarizations, even for p(T) exceeding 30 times the J/psi mass, where lambda(theta) tends to an asymptotic value around 0.3. Taken together with previous measurements, by CMS and LHCb at root s = 7TeV, the prompt polarizations show a significant variation with p(T), at low p(T).

Název v anglickém jazyce

Measurement of the polarizations of prompt and non-prompt J/ψ and ψ(2S) mesons produced in pp collisions at √s=13 TeV

Popis výsledku anglicky

The polarizations of prompt and non-prompt J/psi and psi(2S) mesons are measured in proton-proton collisions at root s = 13TeV, using data samples collected by the CMS experiment in 2017 and 2018, corresponding to a total integrated luminosity of 103.3 fb(-1). Based on the analysis of the dimuon decay angular distributions in the helicity frame, the polar anisotropy, lambda(theta), is measured as a function of the transverse momentum, p(T), of the charmonium states, in the 25-120 and 20-100GeV ranges for the J/psi and psi(2S), respectively. The non-prompt polarizations agree with predictions based on the hypothesis that, for p(T) greater than or similar to 25 GeV, the non-prompt J/psi and psi(2S) are predominantly produced in two-body B meson decays. The prompt results clearly exclude strong transverse polarizations, even for p(T) exceeding 30 times the J/psi mass, where lambda(theta) tends to an asymptotic value around 0.3. Taken together with previous measurements, by CMS and LHCb at root s = 7TeV, the prompt polarizations show a significant variation with p(T), at low p(T).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10300 - Physical sciences

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

2024

Kód důvěrnosti údajů

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

Název periodika

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ISSN

0370-2693

e-ISSN

1873-2445

Svazek periodika

858

Číslo periodika v rámci svazku

30.09.2024

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

30

Strana od-do

139044

Kód UT WoS článku

001381333500001

EID výsledku v databázi Scopus

2-s2.0-85205550955