Test of lepton universality with B[superscript 0] → K[superscript *0] ℓ[superscript +] ℓ[superscript −] decays
A test of lepton universality, performed by measuring the ratio of the branching fractions of the B[superscript 0] → K[superscript *0] μ[superscript +] μ[superscript −] and B[superscript 0] → K[superscript *0] e[superscript +] e[superscript −] decays, R[subscript K[superscript *0]], is presented. T...
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| Format: | Article |
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Springer International Publishing AG
2018
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| Online Access: | http://hdl.handle.net/1721.1/114407 https://orcid.org/0000-0001-5534-1732 https://orcid.org/0000-0001-8285-3346 |
| _version_ | 1811094068839579648 |
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| author | Boettcher, Thomas Julian Ilten, Philip J Williams, Michael |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Boettcher, Thomas Julian Ilten, Philip J Williams, Michael |
| author_sort | Boettcher, Thomas Julian |
| collection | MIT |
| description | A test of lepton universality, performed by measuring the ratio of the branching fractions of the B[superscript 0] → K[superscript *0] μ[superscript +] μ[superscript −] and B[superscript 0] → K[superscript *0] e[superscript +] e[superscript −] decays, R[subscript K[superscript *0]], is presented. The K [superscript *0] meson is reconstructed in the final state K[superscript +] π[superscript −], which is required to have an invariant mass within 100 MeV/c[superscript 2] of the known K[superscript *](892)[superscript 0] mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of about 3 fb[superscript −1], collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The ratio is measured in two regions of the dilepton invariant mass squared, q[superscript 2], to be (Formula presented.) The corresponding 95.4% confidence level intervals are [0.52, 0.89] and [0.53, 0.94] . The results, which represent the most precise measurements of RK*0 to date, are compatible with the Standard Model expectations at the level of 2.1–2.3 and 2.4–2.5 standard deviations in the two q[superscript 2] regions, respectively.[Figure not available: see fulltext.].The corresponding 95.4% confidence level intervals are [0.52, 0.89] and [0.53, 0.94]. The results, which represent the most precise measurements of R[subscript K[superscript ∗0]] to date, are compatible with the Standard Model expectations at the level of 2.1–2.3 and 2.4–2.5 standard deviations in the two q[superscript 2] regions, respectively. |
| first_indexed | 2024-09-23T15:54:45Z |
| format | Article |
| id | mit-1721.1/114407 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T15:54:45Z |
| publishDate | 2018 |
| publisher | Springer International Publishing AG |
| record_format | dspace |
| spelling | mit-1721.1/1144072022-09-29T17:00:37Z Test of lepton universality with B[superscript 0] → K[superscript *0] ℓ[superscript +] ℓ[superscript −] decays Boettcher, Thomas Julian Ilten, Philip J Williams, Michael Massachusetts Institute of Technology. Department of Physics Boettcher, Thomas Julian Ilten, Philip J Williams, Michael A test of lepton universality, performed by measuring the ratio of the branching fractions of the B[superscript 0] → K[superscript *0] μ[superscript +] μ[superscript −] and B[superscript 0] → K[superscript *0] e[superscript +] e[superscript −] decays, R[subscript K[superscript *0]], is presented. The K [superscript *0] meson is reconstructed in the final state K[superscript +] π[superscript −], which is required to have an invariant mass within 100 MeV/c[superscript 2] of the known K[superscript *](892)[superscript 0] mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of about 3 fb[superscript −1], collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The ratio is measured in two regions of the dilepton invariant mass squared, q[superscript 2], to be (Formula presented.) The corresponding 95.4% confidence level intervals are [0.52, 0.89] and [0.53, 0.94] . The results, which represent the most precise measurements of RK*0 to date, are compatible with the Standard Model expectations at the level of 2.1–2.3 and 2.4–2.5 standard deviations in the two q[superscript 2] regions, respectively.[Figure not available: see fulltext.].The corresponding 95.4% confidence level intervals are [0.52, 0.89] and [0.53, 0.94]. The results, which represent the most precise measurements of R[subscript K[superscript ∗0]] to date, are compatible with the Standard Model expectations at the level of 2.1–2.3 and 2.4–2.5 standard deviations in the two q[superscript 2] regions, respectively. 2018-03-27T17:39:16Z 2018-03-27T17:39:16Z 2017-08 2018-03-08T15:07:53Z Article http://purl.org/eprint/type/JournalArticle 1029-8479 1126-6708 http://hdl.handle.net/1721.1/114407 The LHCb collaboration, et al. “Test of Lepton Universality with B[superscript 0] → K[superscript *0] ℓ[superscript +] ℓ[superscript −] Decays.” Journal of High Energy Physics, vol. 2017, no. 8, Aug. 2017. © 2017 The Authors https://orcid.org/0000-0001-5534-1732 https://orcid.org/0000-0001-8285-3346 http://dx.doi.org/10.1007/JHEP08(2017)055 Journal of High Energy Physics Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ application/pdf Springer International Publishing AG |
| spellingShingle | Boettcher, Thomas Julian Ilten, Philip J Williams, Michael Test of lepton universality with B[superscript 0] → K[superscript *0] ℓ[superscript +] ℓ[superscript −] decays |
| title | Test of lepton universality with B[superscript 0] → K[superscript *0] ℓ[superscript +] ℓ[superscript −] decays |
| title_full | Test of lepton universality with B[superscript 0] → K[superscript *0] ℓ[superscript +] ℓ[superscript −] decays |
| title_fullStr | Test of lepton universality with B[superscript 0] → K[superscript *0] ℓ[superscript +] ℓ[superscript −] decays |
| title_full_unstemmed | Test of lepton universality with B[superscript 0] → K[superscript *0] ℓ[superscript +] ℓ[superscript −] decays |
| title_short | Test of lepton universality with B[superscript 0] → K[superscript *0] ℓ[superscript +] ℓ[superscript −] decays |
| title_sort | test of lepton universality with b superscript 0 k superscript 0 l superscript l superscript decays |
| url | http://hdl.handle.net/1721.1/114407 https://orcid.org/0000-0001-5534-1732 https://orcid.org/0000-0001-8285-3346 |
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