Angular and CP-Violation Analyses of B-→D⁎+l-ν-l Decays at Hadron Collider Experiments
The B-→D⁎+l-ν-l branching fractions ratio between muon and tau lepton decay modes R(D⁎) has shown intriguing discrepancies between the Standard Model prediction and measurements performed at BaBar, Belle, and LHCb experiments, a possible sign of beyond the Standard Model physics. Theoretical studies...
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| Format: | Article |
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Wiley
2019-01-01
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| Series: | Advances in High Energy Physics |
| Online Access: | http://dx.doi.org/10.1155/2019/5274609 |
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| author | Daniele Marangotto |
| author_facet | Daniele Marangotto |
| author_sort | Daniele Marangotto |
| collection | DOAJ |
| description | The B-→D⁎+l-ν-l branching fractions ratio between muon and tau lepton decay modes R(D⁎) has shown intriguing discrepancies between the Standard Model prediction and measurements performed at BaBar, Belle, and LHCb experiments, a possible sign of beyond the Standard Model physics. Theoretical studies show how observables related to the B-→D⁎+l-ν-l differential decay distribution can be used to further constrain New Physics contributions, but their experimental measurements are lacking to date. This article proposes the measurement of B-→D⁎+l-ν-l angular and CP-violating observables at hadron collider experiments, by exploiting approximate reconstruction algorithms using information from detectable final-state particles only. The resolution on the phase space variables is studied using B-→D⁎+l-ν-l decays simulated in a forward detector geometry like LHCb. A method to correct the observable values for the reconstruction inaccuracies based on detector simulation is successfully tested on simulated data and the decrease in precision with respect to a perfect reconstruction is evaluated. The D⁎+ longitudinal polarization fraction and the AT(2)CP-violating observable can be measured losing a factor of 2 and 5 in precision, respectively. The extraction of angular distributions from the template fit selecting B-→D⁎+l-ν-l decays and associated systematic uncertainties are also discussed. |
| format | Article |
| id | doaj-art-0a1fb98e436b4231816a625be56e7cf7 |
| institution | Kabale University |
| issn | 1687-7357 1687-7365 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in High Energy Physics |
| spelling | doaj-art-0a1fb98e436b4231816a625be56e7cf72025-02-03T05:50:12ZengWileyAdvances in High Energy Physics1687-73571687-73652019-01-01201910.1155/2019/52746095274609Angular and CP-Violation Analyses of B-→D⁎+l-ν-l Decays at Hadron Collider ExperimentsDaniele Marangotto0Università degli Studi di Milano and INFN Milano, Via Celoria 16, 20133 Milano, ItalyThe B-→D⁎+l-ν-l branching fractions ratio between muon and tau lepton decay modes R(D⁎) has shown intriguing discrepancies between the Standard Model prediction and measurements performed at BaBar, Belle, and LHCb experiments, a possible sign of beyond the Standard Model physics. Theoretical studies show how observables related to the B-→D⁎+l-ν-l differential decay distribution can be used to further constrain New Physics contributions, but their experimental measurements are lacking to date. This article proposes the measurement of B-→D⁎+l-ν-l angular and CP-violating observables at hadron collider experiments, by exploiting approximate reconstruction algorithms using information from detectable final-state particles only. The resolution on the phase space variables is studied using B-→D⁎+l-ν-l decays simulated in a forward detector geometry like LHCb. A method to correct the observable values for the reconstruction inaccuracies based on detector simulation is successfully tested on simulated data and the decrease in precision with respect to a perfect reconstruction is evaluated. The D⁎+ longitudinal polarization fraction and the AT(2)CP-violating observable can be measured losing a factor of 2 and 5 in precision, respectively. The extraction of angular distributions from the template fit selecting B-→D⁎+l-ν-l decays and associated systematic uncertainties are also discussed.http://dx.doi.org/10.1155/2019/5274609 |
| spellingShingle | Daniele Marangotto Angular and CP-Violation Analyses of B-→D⁎+l-ν-l Decays at Hadron Collider Experiments Advances in High Energy Physics |
| title | Angular and CP-Violation Analyses of B-→D⁎+l-ν-l Decays at Hadron Collider Experiments |
| title_full | Angular and CP-Violation Analyses of B-→D⁎+l-ν-l Decays at Hadron Collider Experiments |
| title_fullStr | Angular and CP-Violation Analyses of B-→D⁎+l-ν-l Decays at Hadron Collider Experiments |
| title_full_unstemmed | Angular and CP-Violation Analyses of B-→D⁎+l-ν-l Decays at Hadron Collider Experiments |
| title_short | Angular and CP-Violation Analyses of B-→D⁎+l-ν-l Decays at Hadron Collider Experiments |
| title_sort | angular and cp violation analyses of b d l ν l decays at hadron collider experiments |
| url | http://dx.doi.org/10.1155/2019/5274609 |
| work_keys_str_mv | AT danielemarangotto angularandcpviolationanalysesofbdlnldecaysathadroncolliderexperiments |