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 prove 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 is 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. An 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 one of the CP-violating observables can be measured losing a factor 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.

Angular and CP -violation analyses of B¯ → D∗+l −ν¯l decays at hadron collider experiments / D. Marangotto. - (2018 Dec 19).

Angular and CP -violation analyses of B¯ → D∗+l −ν¯l decays at hadron collider experiments

D. Marangotto
2018

Abstract

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 prove 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 is 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. An 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 one of the CP-violating observables can be measured losing a factor 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.
High Energy Physics - Experiment; High Energy Physics - Experiment; High Energy Physics - Phenomenology
Settore FIS/01 - Fisica Sperimentale
http://arxiv.org/abs/1812.08144v2
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/653006
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