Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at √s = 7 TeV
Authors
Sirunyan, A.Tumasyan, A.
Adam, W.
Ambrogi, F.
Bergauer, T.
Adžić, Petar
Ćirković, Predrag
Đorđević, Miloš
Milenović, Predrag
Milošević, Jovan
Stojanović, Milan
Contributors
CMS CollaborationArticle (Published version)
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The ratios of the production cross sections between the excited ϒ(2S) and ϒ(3S) mesons and the ϒ(1S) ground state, detected via their decay into two muons, are studied as a function of the number of charged particles in the event. The data are from proton-proton collisions at s = 7 TeV, corresponding to an integrated luminosity of 4.8 fb−1, collected with the CMS detector at the LHC. Evidence of a decrease in these ratios as a function of the particle multiplicity is observed, more pronounced at low transverse momentum pTμμ. For ϒ(nS) mesons with pTμμ> 7 GeV, where most of the data were collected, the correlation with multiplicity is studied as a function of the underlying event transverse sphericity and the number of particles in a cone around the ϒ(nS) direction. The ratios are found to be multiplicity independent for jet-like events. The mean pTμμ values for the ϒ(nS) states as a function of particle multiplicity are also measured and found to grow more steeply as their mass increas...es.
Source:
Journal of High Energy Physics, 2020, 2020, 11, 1-39Note:
- CMS Collaboration (ukupan broj autora: 2312)
DOI: 10.1007/JHEP11(2020)001
ISSN: 1029-8479
WoS: 000585126400001
Scopus: 2-s2.0-85096395259
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VinčaTY - JOUR AU - Sirunyan, A. AU - Tumasyan, A. AU - Adam, W. AU - Ambrogi, F. AU - Bergauer, T. AU - Adžić, Petar AU - Ćirković, Predrag AU - Đorđević, Miloš AU - Milenović, Predrag AU - Milošević, Jovan AU - Stojanović, Milan PY - 2020 UR - https://vinar.vin.bg.ac.rs/handle/123456789/9986 AB - The ratios of the production cross sections between the excited ϒ(2S) and ϒ(3S) mesons and the ϒ(1S) ground state, detected via their decay into two muons, are studied as a function of the number of charged particles in the event. The data are from proton-proton collisions at s = 7 TeV, corresponding to an integrated luminosity of 4.8 fb−1, collected with the CMS detector at the LHC. Evidence of a decrease in these ratios as a function of the particle multiplicity is observed, more pronounced at low transverse momentum pTμμ. For ϒ(nS) mesons with pTμμ> 7 GeV, where most of the data were collected, the correlation with multiplicity is studied as a function of the underlying event transverse sphericity and the number of particles in a cone around the ϒ(nS) direction. The ratios are found to be multiplicity independent for jet-like events. The mean pTμμ values for the ϒ(nS) states as a function of particle multiplicity are also measured and found to grow more steeply as their mass increases. T2 - Journal of High Energy Physics T1 - Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at √s = 7 TeV VL - 2020 IS - 11 SP - 1 EP - 39 DO - 10.1007/JHEP11(2020)001 ER -
@article{ author = "Sirunyan, A. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Bergauer, T. and Adžić, Petar and Ćirković, Predrag and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan and Stojanović, Milan", year = "2020", abstract = "The ratios of the production cross sections between the excited ϒ(2S) and ϒ(3S) mesons and the ϒ(1S) ground state, detected via their decay into two muons, are studied as a function of the number of charged particles in the event. The data are from proton-proton collisions at s = 7 TeV, corresponding to an integrated luminosity of 4.8 fb−1, collected with the CMS detector at the LHC. Evidence of a decrease in these ratios as a function of the particle multiplicity is observed, more pronounced at low transverse momentum pTμμ. For ϒ(nS) mesons with pTμμ> 7 GeV, where most of the data were collected, the correlation with multiplicity is studied as a function of the underlying event transverse sphericity and the number of particles in a cone around the ϒ(nS) direction. The ratios are found to be multiplicity independent for jet-like events. The mean pTμμ values for the ϒ(nS) states as a function of particle multiplicity are also measured and found to grow more steeply as their mass increases.", journal = "Journal of High Energy Physics", title = "Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at √s = 7 TeV", volume = "2020", number = "11", pages = "1-39", doi = "10.1007/JHEP11(2020)001" }
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, P., Ćirković, P., Đorđević, M., Milenović, P., Milošević, J.,& Stojanović, M.. (2020). Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at √s = 7 TeV. in Journal of High Energy Physics, 2020(11), 1-39. https://doi.org/10.1007/JHEP11(2020)001
Sirunyan A, Tumasyan A, Adam W, Ambrogi F, Bergauer T, Adžić P, Ćirković P, Đorđević M, Milenović P, Milošević J, Stojanović M. Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at √s = 7 TeV. in Journal of High Energy Physics. 2020;2020(11):1-39. doi:10.1007/JHEP11(2020)001 .
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Adžić, Petar, Ćirković, Predrag, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, Stojanović, Milan, "Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at √s = 7 TeV" in Journal of High Energy Physics, 2020, no. 11 (2020):1-39, https://doi.org/10.1007/JHEP11(2020)001 . .