Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at s$$ \sqrt{s} $$ = 7 TeV
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...
| 主要な著者: | , , , , , , , , , , , , , , , |
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| その他の著者: | |
| フォーマット: | 論文 |
| 言語: | English |
| 出版事項: |
Springer Berlin Heidelberg
2021
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| オンライン･アクセス: | https://hdl.handle.net/1721.1/131827 |
| _version_ | 1826211158060695552 |
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| author | Sirunyan, A. M Tumasyan, A. Adam, W. Ambrogi, F. Bergauer, T. Dragicevic, M. Erö, J. Escalante Del Valle, A. Flechl, M. Frühwirth, R. Jeitler, M. Krammer, N. Krätschmer, I. Liko, D. Madlener, T. Mikulec, I. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Sirunyan, A. M Tumasyan, A. Adam, W. Ambrogi, F. Bergauer, T. Dragicevic, M. Erö, J. Escalante Del Valle, A. Flechl, M. Frühwirth, R. Jeitler, M. Krammer, N. Krätschmer, I. Liko, D. Madlener, T. Mikulec, I. |
| author_sort | Sirunyan, A. M |
| collection | MIT |
| description | 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
$$ \sqrt{s} $$
= 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
p
T
μμ
$$ {p}_{\mathrm{T}}^{\upmu \upmu} $$
. For ϒ(nS) mesons with
p
T
μμ
$$ {p}_{\mathrm{T}}^{\upmu \upmu} $$
> 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
p
T
μμ
$$ {p}_{\mathrm{T}}^{\upmu \upmu} $$
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. |
| first_indexed | 2024-09-23T15:01:29Z |
| format | Article |
| id | mit-1721.1/131827 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T15:01:29Z |
| publishDate | 2021 |
| publisher | Springer Berlin Heidelberg |
| record_format | dspace |
| spelling | mit-1721.1/1318272023-12-18T20:05:03Z Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at s$$ \sqrt{s} $$ = 7 TeV Sirunyan, A. M Tumasyan, A. Adam, W. Ambrogi, F. Bergauer, T. Dragicevic, M. Erö, J. Escalante Del Valle, A. Flechl, M. Frühwirth, R. Jeitler, M. Krammer, N. Krätschmer, I. Liko, D. Madlener, T. Mikulec, I. Massachusetts Institute of Technology. Department of Physics 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 $$ \sqrt{s} $$ = 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 p T μμ $$ {p}_{\mathrm{T}}^{\upmu \upmu} $$ . For ϒ(nS) mesons with p T μμ $$ {p}_{\mathrm{T}}^{\upmu \upmu} $$ > 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 p T μμ $$ {p}_{\mathrm{T}}^{\upmu \upmu} $$ 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. 2021-09-20T17:30:28Z 2021-09-20T17:30:28Z 2020-11-02 2020-11-08T07:34:37Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/131827 Journal of High Energy Physics. 2020 Nov 02;2020(11):1 PUBLISHER_CC en https://doi.org/10.1007/JHEP11(2020)001 Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ The Author(s) application/pdf Springer Berlin Heidelberg Springer Berlin Heidelberg |
| spellingShingle | Sirunyan, A. M Tumasyan, A. Adam, W. Ambrogi, F. Bergauer, T. Dragicevic, M. Erö, J. Escalante Del Valle, A. Flechl, M. Frühwirth, R. Jeitler, M. Krammer, N. Krätschmer, I. Liko, D. Madlener, T. Mikulec, I. Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at s$$ \sqrt{s} $$ = 7 TeV |
| title | Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at s$$ \sqrt{s} $$ = 7 TeV |
| title_full | Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at s$$ \sqrt{s} $$ = 7 TeV |
| title_fullStr | Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at s$$ \sqrt{s} $$ = 7 TeV |
| title_full_unstemmed | Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at s$$ \sqrt{s} $$ = 7 TeV |
| title_short | Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at s$$ \sqrt{s} $$ = 7 TeV |
| title_sort | investigation into the event activity dependence of ϒ ns relative production in proton proton collisions at s sqrt s 7 tev |
| url | https://hdl.handle.net/1721.1/131827 |
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