Measurement of the polarizations of prompt and non-prompt Image 1 and <math altimg="si1.svg"><mi mathvariant="normal">ψ</mi><mrow><mo stretchy="false">(</mo><mn mathvariant="normal">2S</mn><mo stretchy="false">)</mo></mrow></math> mesons produced in pp collisions at <math altimg="si2.svg"><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>13</mn><mspace width="0.2em"/><mtext>TeV</mtext></math>

Hayrapetyan, Aram; Tumasyan, Armen; Adam, Wolfgang; Andrejkovic, Janik Walter; Bergauer, Thomas; Chatterjee, Suman; Damanakis, Konstantinos; Dragicevic, Marko; Hussain, Priya Sajid; Jeitler, Manfred

doi:10.1016/j.physletb.2024.139044

Measurement of the polarizations of prompt and non-prompt Image 1 and $ψ (2S)$ mesons produced in pp collisions at $\sqrt{s} = 13 TeV$

CMS

Collaboration

Jun 20, 2024

43 pages

Published in:

Phys.Lett.B 858 (2024) 139044

Published: Sep 30, 2024

e-Print:

2406.14409 [hep-ex]

DOI:

10.1016/j.physletb.2024.139044 (publication)

Report number:

CMS-BPH-22-009,
CERN-EP-2024-155

Experiments:

CERN-LHC-CMS

View in:

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reference search2 citations

Citations per year

Abstract: (Elsevier B.V.)

The polarizations of prompt and non-prompt Image 2 and

ψ (2S)

mesons are measured in proton-proton collisions at

\sqrt{s} = 13

 TeV, 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,

λ_{ϑ}

, is measured as a function of the transverse momentum,

p_{T}

, of the charmonium states, in the 25–120 and 20–100 GeV ranges for the Image 2 and

ψ (2S)

, respectively. The non-prompt polarizations agree with predictions based on the hypothesis that, for

p_{T} ≳ 25 GeV

, the non-prompt Image 2 and

ψ (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 Image 2 mass, where

λ_{ϑ}

tends to an asymptotic value around 0.3. Taken together with previous measurements, by CMS and LHCb at

\sqrt{s} = 7

 TeV, the prompt polarizations show a significant variation with

p_{T}

, at low

p_{T}

.

Note:

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-22-009 (CMS Public Pages)

CMS
Quarkonium production
Quarkonium polarization

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Measurement of the polarizations of prompt and non-prompt Image 1 and ψ(2S) mesons produced in pp collisions at s=13TeV

Citations per year

Measurement of the polarizations of prompt and non-prompt Image 1 and $ψ (2S)$ mesons produced in pp collisions at $\sqrt{s} = 13 TeV$