Measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at √s[subscript NN] = 2.76 TeV with the ATLAS detector at the LHC
The distributions of event-by-event harmonic flow coefficients v [subscript n] for n = 2- 4 are measured in √s[subscript NN] = 2.76 TeV Pb + Pb collisions using the ATLAS detector at the LHC. The measurements are performed using charged particles with transverse momentum p [subscript T] > 0.5 GeV...
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| Format: | Article |
| Language: | en_US |
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Springer-Verlag
2014
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| Online Access: | http://hdl.handle.net/1721.1/86023 https://orcid.org/0000-0002-7586-7253 |
| _version_ | 1826206516540080128 |
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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 | The distributions of event-by-event harmonic flow coefficients v [subscript n] for n = 2- 4 are measured in √s[subscript NN] = 2.76 TeV Pb + Pb collisions using the ATLAS detector at the LHC. The measurements are performed using charged particles with transverse momentum p [subscript T] > 0.5 GeV and in the pseudorapidity range |η| < 2.5 in a dataset of approximately 7 μb[superscript −1] recorded in 2010. The shapes of the v [subscript n] distributions suggest that the associated flow vectors are described by a two-dimensional Gaussian function in central collisions for v [subscript 2] and over most of the measured centrality range for v [subscript 3] and v [subscript 4]. Significant deviations from this function are observed for v [subscript 2] in mid-central and peripheral collisions, and a small deviation is observed for v [subscript 3] in mid-central collisions. In order to be sensitive to these deviations, it is shown that the commonly used multi-particle cumulants, involving four particles or more, need to be measured with a precision better than a few percent. The v [subscript n] distributions are also measured independently for charged particles with 0.5 < p [subscript T] < 1 GeV and p [subscript T] > 1 GeV. When these distributions are rescaled to the same mean values, the adjusted shapes are found to be nearly the same for these two p [subscript T] ranges. The v [subscript n] distributions are compared with the eccentricity distributions from two models for the initial collision geometry: a Glauber model and a model that includes corrections to the initial geometry due to gluon saturation effects. Both models fail to describe the experimental data consistently over most of the measured centrality range. |
| first_indexed | 2024-09-23T13:34:14Z |
| format | Article |
| id | mit-1721.1/86023 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:34:14Z |
| publishDate | 2014 |
| publisher | Springer-Verlag |
| record_format | dspace |
| spelling | mit-1721.1/860232022-09-28T14:42:00Z Measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at √s[subscript NN] = 2.76 TeV with the ATLAS detector at the LHC Taylor, Frank E. Massachusetts Institute of Technology. Department of Physics Taylor, Frank E. The distributions of event-by-event harmonic flow coefficients v [subscript n] for n = 2- 4 are measured in √s[subscript NN] = 2.76 TeV Pb + Pb collisions using the ATLAS detector at the LHC. The measurements are performed using charged particles with transverse momentum p [subscript T] > 0.5 GeV and in the pseudorapidity range |η| < 2.5 in a dataset of approximately 7 μb[superscript −1] recorded in 2010. The shapes of the v [subscript n] distributions suggest that the associated flow vectors are described by a two-dimensional Gaussian function in central collisions for v [subscript 2] and over most of the measured centrality range for v [subscript 3] and v [subscript 4]. Significant deviations from this function are observed for v [subscript 2] in mid-central and peripheral collisions, and a small deviation is observed for v [subscript 3] in mid-central collisions. In order to be sensitive to these deviations, it is shown that the commonly used multi-particle cumulants, involving four particles or more, need to be measured with a precision better than a few percent. The v [subscript n] distributions are also measured independently for charged particles with 0.5 < p [subscript T] < 1 GeV and p [subscript T] > 1 GeV. When these distributions are rescaled to the same mean values, the adjusted shapes are found to be nearly the same for these two p [subscript T] ranges. The v [subscript n] distributions are compared with the eccentricity distributions from two models for the initial collision geometry: a Glauber model and a model that includes corrections to the initial geometry due to gluon saturation effects. Both models fail to describe the experimental data consistently over most of the measured centrality range. United States. Dept. of Energy National Science Foundation (U.S.) Brookhaven National Laboratory 2014-04-04T17:15:31Z 2014-04-04T17:15:31Z 2013-11 2013-10 Article http://purl.org/eprint/type/JournalArticle 1029-8479 1126-6708 http://hdl.handle.net/1721.1/86023 The ATLAS collaboration et al. “Measurement of the Distributions of Event-by-Event Flow Harmonics in Lead-Lead Collisions at √s[subscript NN] = 2.76 TeV with the ATLAS Detector at the LHC.” Journal of High Energy Physics 2013.11 (2013): n. pag. © CERN, for the benefit of the ATLAS collaboration https://orcid.org/0000-0002-7586-7253 en_US http://dx.doi.org/10.1007/jhep11(2013)183 Journal of High Energy Physics Publisher with Creative Commons License http://creativecommons.org/licenses/by/4.0 application/pdf Springer-Verlag Springer-Verlag |
| spellingShingle | Taylor, Frank E. Measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at √s[subscript NN] = 2.76 TeV with the ATLAS detector at the LHC |
| title | Measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at √s[subscript NN] = 2.76 TeV with the ATLAS detector at the LHC |
| title_full | Measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at √s[subscript NN] = 2.76 TeV with the ATLAS detector at the LHC |
| title_fullStr | Measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at √s[subscript NN] = 2.76 TeV with the ATLAS detector at the LHC |
| title_full_unstemmed | Measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at √s[subscript NN] = 2.76 TeV with the ATLAS detector at the LHC |
| title_short | Measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at √s[subscript NN] = 2.76 TeV with the ATLAS detector at the LHC |
| title_sort | measurement of the distributions of event by event flow harmonics in lead lead collisions at √s subscript nn 2 76 tev with the atlas detector at the lhc |
| url | http://hdl.handle.net/1721.1/86023 https://orcid.org/0000-0002-7586-7253 |
| work_keys_str_mv | AT taylorfranke measurementofthedistributionsofeventbyeventflowharmonicsinleadleadcollisionsatssubscriptnn276tevwiththeatlasdetectoratthelhc |