Measurement of the B → X[subscript s]ℓ[superscript +]ℓ[superscript −] Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States
We measure the total branching fraction of the flavor-changing neutral-current process B → X[subscript s]ℓ[superscript +]ℓ[superscript −], along with partial branching fractions in bins of dilepton and hadronic system (X[subscript s]) mass, using a sample of 471 × 10[superscript 6] Υ(4S) → B[bar ove...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Physical Society
2014
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| Online Access: | http://hdl.handle.net/1721.1/90879 |
| _version_ | 1811092819173965824 |
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| author | Dujmic, Denis Sciolla, Gabriella Cowan, Ray F |
| author2 | Massachusetts Institute of Technology. Laboratory for Nuclear Science |
| author_facet | Massachusetts Institute of Technology. Laboratory for Nuclear Science Dujmic, Denis Sciolla, Gabriella Cowan, Ray F |
| author_sort | Dujmic, Denis |
| collection | MIT |
| description | We measure the total branching fraction of the flavor-changing neutral-current process B → X[subscript s]ℓ[superscript +]ℓ[superscript −], along with partial branching fractions in bins of dilepton and hadronic system (X[subscript s]) mass, using a sample of 471 × 10[superscript 6] Υ(4S) → B[bar over B] events recorded with the BABAR detector. The admixture of charged and neutral B mesons produced at PEP-II2 are reconstructed by combining a dilepton pair with 10 different X[subscript s] final states. Extrapolating from a sum over these exclusive modes, we measure a lepton-flavor-averaged inclusive branching fraction B(B → X[subscript s]ℓ[superscript +]ℓ[superscript −]) = [6.73[+0.70 over −0.64](stat)[+0.34 over −0.25](exp syst) ± 0.50(model syst)] × 10[superscript −6] for m[2 over ℓ+ℓ−] > 0.1 GeV[superscript 2]/c[superscript 4]. Restricting our analysis exclusively to final states from which a decaying B meson’s flavor can be inferred, we additionally report measurements of the direct CP asymmetry A[subscript CP] in bins of dilepton mass; over the full dilepton mass range, we find A[subscript CP] = 0.04 ± 0.11 ± 0.01 for a lepton-flavor-averaged sample. |
| first_indexed | 2024-09-23T15:28:04Z |
| format | Article |
| id | mit-1721.1/90879 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:28:04Z |
| publishDate | 2014 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/908792023-02-26T07:40:23Z Measurement of the B → X[subscript s]ℓ[superscript +]ℓ[superscript −] Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States Dujmic, Denis Sciolla, Gabriella Cowan, Ray F Massachusetts Institute of Technology. Laboratory for Nuclear Science Cowan, Ray Franklin Dujmic, Denis Sciolla, Gabriella We measure the total branching fraction of the flavor-changing neutral-current process B → X[subscript s]ℓ[superscript +]ℓ[superscript −], along with partial branching fractions in bins of dilepton and hadronic system (X[subscript s]) mass, using a sample of 471 × 10[superscript 6] Υ(4S) → B[bar over B] events recorded with the BABAR detector. The admixture of charged and neutral B mesons produced at PEP-II2 are reconstructed by combining a dilepton pair with 10 different X[subscript s] final states. Extrapolating from a sum over these exclusive modes, we measure a lepton-flavor-averaged inclusive branching fraction B(B → X[subscript s]ℓ[superscript +]ℓ[superscript −]) = [6.73[+0.70 over −0.64](stat)[+0.34 over −0.25](exp syst) ± 0.50(model syst)] × 10[superscript −6] for m[2 over ℓ+ℓ−] > 0.1 GeV[superscript 2]/c[superscript 4]. Restricting our analysis exclusively to final states from which a decaying B meson’s flavor can be inferred, we additionally report measurements of the direct CP asymmetry A[subscript CP] in bins of dilepton mass; over the full dilepton mass range, we find A[subscript CP] = 0.04 ± 0.11 ± 0.01 for a lepton-flavor-averaged sample. United States. Dept. of Energy National Science Foundation (U.S.) Alfred P. Sloan Foundation 2014-10-10T13:05:42Z 2014-10-10T13:05:42Z 2014-05 2014-04 Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/90879 Lees, J. P., V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, B. Stugu, et al. “Measurement of the B → X[subscript s]ℓ[superscript +]ℓ[superscript −] Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States.” Physical Review Letters 112, no. 21 (May 2014). © 2014 American Physical Society en_US http://dx.doi.org/10.1103/PhysRevLett.112.211802 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 | Dujmic, Denis Sciolla, Gabriella Cowan, Ray F Measurement of the B → X[subscript s]ℓ[superscript +]ℓ[superscript −] Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States |
| title | Measurement of the B → X[subscript s]ℓ[superscript +]ℓ[superscript −] Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States |
| title_full | Measurement of the B → X[subscript s]ℓ[superscript +]ℓ[superscript −] Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States |
| title_fullStr | Measurement of the B → X[subscript s]ℓ[superscript +]ℓ[superscript −] Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States |
| title_full_unstemmed | Measurement of the B → X[subscript s]ℓ[superscript +]ℓ[superscript −] Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States |
| title_short | Measurement of the B → X[subscript s]ℓ[superscript +]ℓ[superscript −] Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States |
| title_sort | measurement of the b x subscript s l superscript l superscript branching fraction and search for direct cp violation from a sum of exclusive final states |
| url | http://hdl.handle.net/1721.1/90879 |
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