Measurement of upsilon production in 7 TeV pp collisions at ATLAS
Using 1.8 fb[superscript -1] of pp collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the Large Hadron Collider, we present measurements of the production cross sections of Υ(1S,2S,3S) mesons. Υ mesons are reconstructed using the dimuon decay mode. Total production cro...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2013
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| Online Access: | http://hdl.handle.net/1721.1/79653 https://orcid.org/0000-0002-7586-7253 |
| _version_ | 1826202282216128512 |
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| author | Taylor, Frank E. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Taylor, Frank E. |
| author_sort | Taylor, Frank E. |
| collection | MIT |
| description | Using 1.8 fb[superscript -1] of pp collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the Large Hadron Collider, we present measurements of the production cross sections of Υ(1S,2S,3S) mesons. Υ mesons are reconstructed using the dimuon decay mode. Total production cross sections for p[subscript T]<70 GeV and in the rapidity interval |y[superscript Υ]|<2.25 are measured to be, 8.01±0.02±0.36±0.31 nb, 2.05±0.01±0.12±0.08 nb, and 0.92±0.01±0.07±0.04 nb, respectively, with uncertainties separated into statistical, systematic, and luminosity measurement effects. In addition, differential cross section times dimuon branching fractions for Υ(1S), Υ(2S), and Υ(3S) as a function of Υ transverse momentum p[subscript T] and rapidity are presented. These cross sections are obtained assuming unpolarized production. If the production polarization is fully transverse or longitudinal with no azimuthal dependence in the helicity frame, the cross section may vary by approximately ±20%. If a nontrivial azimuthal dependence is considered, integrated cross sections may be significantly enhanced by a factor of 2 or more. We compare our results to several theoretical models of Υ meson production, finding that none provide an accurate description of our data over the full range of Υ transverse momenta accessible with this data set. |
| first_indexed | 2024-09-23T12:05:03Z |
| format | Article |
| id | mit-1721.1/79653 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:05:03Z |
| publishDate | 2013 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/796532022-09-28T00:00:24Z Measurement of upsilon production in 7 TeV pp collisions at ATLAS Taylor, Frank E. Massachusetts Institute of Technology. Department of Physics Taylor, Frank E. Using 1.8 fb[superscript -1] of pp collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the Large Hadron Collider, we present measurements of the production cross sections of Υ(1S,2S,3S) mesons. Υ mesons are reconstructed using the dimuon decay mode. Total production cross sections for p[subscript T]<70 GeV and in the rapidity interval |y[superscript Υ]|<2.25 are measured to be, 8.01±0.02±0.36±0.31 nb, 2.05±0.01±0.12±0.08 nb, and 0.92±0.01±0.07±0.04 nb, respectively, with uncertainties separated into statistical, systematic, and luminosity measurement effects. In addition, differential cross section times dimuon branching fractions for Υ(1S), Υ(2S), and Υ(3S) as a function of Υ transverse momentum p[subscript T] and rapidity are presented. These cross sections are obtained assuming unpolarized production. If the production polarization is fully transverse or longitudinal with no azimuthal dependence in the helicity frame, the cross section may vary by approximately ±20%. If a nontrivial azimuthal dependence is considered, integrated cross sections may be significantly enhanced by a factor of 2 or more. We compare our results to several theoretical models of Υ meson production, finding that none provide an accurate description of our data over the full range of Υ transverse momenta accessible with this data set. United States. Dept. of Energy. National Science Foundation (U.S.) 2013-07-22T17:13:28Z 2013-07-22T17:13:28Z 2013-03 2012-11 Article http://purl.org/eprint/type/JournalArticle 1550-7998 1550-2368 http://hdl.handle.net/1721.1/79653 Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, A. A. Abdelalim, O. Abdinov, et al. Measurement of Upsilon Production in 7 TeV Pp Collisions at ATLAS. Physical Review D 87, no. 5 (March 2013). https://orcid.org/0000-0002-7586-7253 en_US http://dx.doi.org/10.1103/PhysRevD.87.052004 Physical Review D Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Taylor, Frank E. Measurement of upsilon production in 7 TeV pp collisions at ATLAS |
| title | Measurement of upsilon production in 7 TeV pp collisions at ATLAS |
| title_full | Measurement of upsilon production in 7 TeV pp collisions at ATLAS |
| title_fullStr | Measurement of upsilon production in 7 TeV pp collisions at ATLAS |
| title_full_unstemmed | Measurement of upsilon production in 7 TeV pp collisions at ATLAS |
| title_short | Measurement of upsilon production in 7 TeV pp collisions at ATLAS |
| title_sort | measurement of upsilon production in 7 tev pp collisions at atlas |
| url | http://hdl.handle.net/1721.1/79653 https://orcid.org/0000-0002-7586-7253 |
| work_keys_str_mv | AT taylorfranke measurementofupsilonproductionin7tevppcollisionsatatlas |