Measurement of the parity-violating asymmetry parameter α[subscript b] and the helicity amplitudes for the decay Λ[0 over b] → J/ψΛ[superscript 0] with the ATLAS detector
A measurement of the parity-violating decay asymmetry parameter, α[subscript b], and the helicity amplitudes for the decay Λ[0 over b] → J/ψ(μ[superscript +]μ[superscript −])Λ[superscript 0](pπ[superscript −]) is reported. The analysis is based on 1400 Λ[0 over b] and [bar over Λ][0 over b] baryons...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2014
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| Online Access: | http://hdl.handle.net/1721.1/90883 https://orcid.org/0000-0002-7586-7253 |
| _version_ | 1811075355008565248 |
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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 | A measurement of the parity-violating decay asymmetry parameter, α[subscript b], and the helicity amplitudes for the decay Λ[0 over b] → J/ψ(μ[superscript +]μ[superscript −])Λ[superscript 0](pπ[superscript −]) is reported. The analysis is based on 1400 Λ[0 over b] and [bar over Λ][0 over b] baryons selected in 4.6 fb[superscript −1] of proton–proton collision data with a center-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. By combining the Λ[0 over b] and [bar over Λ][0 over b] samples under the assumption of CP conservation, the value of α[subscript b] is measured to be 0.30 ± 0.16(stat) ± 0.06(syst). This measurement provides a test of theoretical models based on perturbative QCD or heavy-quark effective theory. |
| first_indexed | 2024-09-23T10:04:43Z |
| format | Article |
| id | mit-1721.1/90883 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:04:43Z |
| publishDate | 2014 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/908832022-09-26T15:33:34Z Measurement of the parity-violating asymmetry parameter α[subscript b] and the helicity amplitudes for the decay Λ[0 over b] → J/ψΛ[superscript 0] with the ATLAS detector Taylor, Frank E. Massachusetts Institute of Technology. Department of Physics Taylor, Frank E. A measurement of the parity-violating decay asymmetry parameter, α[subscript b], and the helicity amplitudes for the decay Λ[0 over b] → J/ψ(μ[superscript +]μ[superscript −])Λ[superscript 0](pπ[superscript −]) is reported. The analysis is based on 1400 Λ[0 over b] and [bar over Λ][0 over b] baryons selected in 4.6 fb[superscript −1] of proton–proton collision data with a center-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. By combining the Λ[0 over b] and [bar over Λ][0 over b] samples under the assumption of CP conservation, the value of α[subscript b] is measured to be 0.30 ± 0.16(stat) ± 0.06(syst). This measurement provides a test of theoretical models based on perturbative QCD or heavy-quark effective theory. United States. Dept. of Energy National Science Foundation (U.S.) Brookhaven National Laboratory 2014-10-10T14:10:39Z 2014-10-10T14:10:39Z 2014-05 2014-04 Article http://purl.org/eprint/type/JournalArticle 1550-7998 1550-2368 http://hdl.handle.net/1721.1/90883 Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, et al. “Measurement of the Parity-Violating Asymmetry Parameter α[subscript b] and the Helicity Amplitudes for the Decay Λ[0 over b] → J/ψΛ[superscript 0] with the ATLAS Detector.” Phys. Rev. D 89, no. 9 (May 2014). © 2014 CERN, for the ATLAS Collaboration https://orcid.org/0000-0002-7586-7253 en_US http://dx.doi.org/10.1103/PhysRevD.89.092009 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 American Physical Society |
| spellingShingle | Taylor, Frank E. Measurement of the parity-violating asymmetry parameter α[subscript b] and the helicity amplitudes for the decay Λ[0 over b] → J/ψΛ[superscript 0] with the ATLAS detector |
| title | Measurement of the parity-violating asymmetry parameter α[subscript b] and the helicity amplitudes for the decay Λ[0 over b] → J/ψΛ[superscript 0] with the ATLAS detector |
| title_full | Measurement of the parity-violating asymmetry parameter α[subscript b] and the helicity amplitudes for the decay Λ[0 over b] → J/ψΛ[superscript 0] with the ATLAS detector |
| title_fullStr | Measurement of the parity-violating asymmetry parameter α[subscript b] and the helicity amplitudes for the decay Λ[0 over b] → J/ψΛ[superscript 0] with the ATLAS detector |
| title_full_unstemmed | Measurement of the parity-violating asymmetry parameter α[subscript b] and the helicity amplitudes for the decay Λ[0 over b] → J/ψΛ[superscript 0] with the ATLAS detector |
| title_short | Measurement of the parity-violating asymmetry parameter α[subscript b] and the helicity amplitudes for the decay Λ[0 over b] → J/ψΛ[superscript 0] with the ATLAS detector |
| title_sort | measurement of the parity violating asymmetry parameter α subscript b and the helicity amplitudes for the decay λ 0 over b j ψλ superscript 0 with the atlas detector |
| url | http://hdl.handle.net/1721.1/90883 https://orcid.org/0000-0002-7586-7253 |
| work_keys_str_mv | AT taylorfranke measurementoftheparityviolatingasymmetryparameterasubscriptbandthehelicityamplitudesforthedecayl0overbjpslsuperscript0withtheatlasdetector |