Observation of Photon Polarization in the b → sγ Transition
This Letter presents a study of the flavor-changing neutral current radiative B[superscript ±] → K[superscript ±]π[superscript ∓]π[superscript ±]γ decays performed using data collected in proton-proton collisions with the LHCb detector at 7 and 8 TeV center-of-mass energies. In this sample, correspo...
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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/1721.1/88714 https://orcid.org/0000-0001-8285-3346 https://orcid.org/0000-0002-4670-1334 https://orcid.org/0000-0001-5534-1732 |
| _version_ | 1826199217877549056 |
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| author | Counts, Ian Thomas Hunt Williams, Michael Ilten, Philip J |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Counts, Ian Thomas Hunt Williams, Michael Ilten, Philip J |
| author_sort | Counts, Ian Thomas Hunt |
| collection | MIT |
| description | This Letter presents a study of the flavor-changing neutral current radiative B[superscript ±] → K[superscript ±]π[superscript ∓]π[superscript ±]γ decays performed using data collected in proton-proton collisions with the LHCb detector at 7 and 8 TeV center-of-mass energies. In this sample, corresponding to an integrated luminosity of 3 fb[superscript −1], nearly 14 000 signal events are reconstructed and selected, containing all possible intermediate resonances with a K[superscript ±]π[superscript ∓]π[superscript ±] final state in the [1.1, 1.9] GeV/c[superscript 2] mass range. The distribution of the angle of the photon direction with respect to the plane defined by the final-state hadrons in their rest frame is studied in intervals of K[superscript ±]π[superscript ∓]π[superscript ±] mass and the asymmetry between the number of signal events found on each side of the plane is obtained. The first direct observation of the photon polarization in the b → sγ transition is reported with a significance of 5.2σ. |
| first_indexed | 2024-09-23T11:16:36Z |
| format | Article |
| id | mit-1721.1/88714 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:16:36Z |
| publishDate | 2014 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/887142023-02-26T04:24:34Z Observation of Photon Polarization in the b → sγ Transition Counts, Ian Thomas Hunt Williams, Michael Ilten, Philip J Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Counts, Ian Thomas Hunt Ilten, Philip James Williams, Michael This Letter presents a study of the flavor-changing neutral current radiative B[superscript ±] → K[superscript ±]π[superscript ∓]π[superscript ±]γ decays performed using data collected in proton-proton collisions with the LHCb detector at 7 and 8 TeV center-of-mass energies. In this sample, corresponding to an integrated luminosity of 3 fb[superscript −1], nearly 14 000 signal events are reconstructed and selected, containing all possible intermediate resonances with a K[superscript ±]π[superscript ∓]π[superscript ±] final state in the [1.1, 1.9] GeV/c[superscript 2] mass range. The distribution of the angle of the photon direction with respect to the plane defined by the final-state hadrons in their rest frame is studied in intervals of K[superscript ±]π[superscript ∓]π[superscript ±] mass and the asymmetry between the number of signal events found on each side of the plane is obtained. The first direct observation of the photon polarization in the b → sγ transition is reported with a significance of 5.2σ. National Science Foundation (U.S.) 2014-08-15T15:39:32Z 2014-08-15T15:39:32Z 2014-04 2014-02 Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/88714 Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, et al. “Observation of Photon Polarization in the b → sγ Transition.” Physical Review Letters 112, no. 16 (April 2014). © 2014 CERN, for the LHCb Collaboration https://orcid.org/0000-0001-8285-3346 https://orcid.org/0000-0002-4670-1334 https://orcid.org/0000-0001-5534-1732 en_US http://dx.doi.org/10.1103/PhysRevLett.112.161801 Physical Review Letters 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 | Counts, Ian Thomas Hunt Williams, Michael Ilten, Philip J Observation of Photon Polarization in the b → sγ Transition |
| title | Observation of Photon Polarization in the b → sγ Transition |
| title_full | Observation of Photon Polarization in the b → sγ Transition |
| title_fullStr | Observation of Photon Polarization in the b → sγ Transition |
| title_full_unstemmed | Observation of Photon Polarization in the b → sγ Transition |
| title_short | Observation of Photon Polarization in the b → sγ Transition |
| title_sort | observation of photon polarization in the b sγ transition |
| url | http://hdl.handle.net/1721.1/88714 https://orcid.org/0000-0001-8285-3346 https://orcid.org/0000-0002-4670-1334 https://orcid.org/0000-0001-5534-1732 |
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