• Open Access

Implications for the ΔAFB anomaly in B¯0D*+ν¯ using a new Monte Carlo event generator

Bhubanjyoti Bhattacharya, Thomas E. Browder, Quinn Campagna, Alakabha Datta, Shawn Dubey, Lopamudra Mukherjee, and Alexei Sibidanov
Phys. Rev. D 107, 015011 – Published 13 January 2023

Abstract

Recent experimental results in B physics from Belle, BABAR, and LHCb suggest new physics (NP) in the weak bc charged-current processes. Here we focus specifically on the decay modes B¯0D*+ν¯ with =e and μ. The world averages of the ratios RD and RD* currently differ from the Standard Model (SM) predictions by 3.4σ while recently a new anomaly has been observed in the forward-backward asymmetry measurement, AFB, in B¯0D*+μν¯ decay. It is found that ΔAFB=AFB(BD*μν)AFB(BD*eν) is around 4.1σ away from the SM prediction in an analysis of 2019 Belle data. In this work we explore possible solutions to the ΔAFB anomaly and point out correlated NP signals in other angular observables. These correlations between angular observables must be present in the case of beyond the Standard Model physics. We stress the importance of Δ type observables that are obtained by taking the difference of the observable for the muon and the electron mode. These quantities cancel form-factor uncertainties in the SM and allow for clean tests of NP. These intriguing results also suggest an urgent need for improved simulation and analysis techniques in B¯0D*+ν¯ decays. Here we also describe a new Monte Carlo event generator tool based on EVTGEN that we developed to allow simulation of the NP signatures in B¯0D*+ν, which arise due to the interference between the SM and NP amplitudes. We then discuss prospects for improved observables sensitive to NP couplings with 1, 5, 50, and 250ab1 of Belle II data, which seem to be ideally suited for this class of measurements.

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  • Received 6 July 2022
  • Accepted 20 December 2022

DOI:https://doi.org/10.1103/PhysRevD.107.015011

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Bhubanjyoti Bhattacharya1,*, Thomas E. Browder2,†, Quinn Campagna3,‡, Alakabha Datta3,§, Shawn Dubey2,¶, Lopamudra Mukherjee3,∥, and Alexei Sibidanov2,**

  • 1Department of Natural Sciences, Lawrence Technological University, Southfield, Michigan 48075, USA
  • 2Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822, USA
  • 3Department of Physics and Astronomy, 108 Lewis Hall, University of Mississippi, Oxford, Mississippi 38677-1848, USA

  • *bbhattach@ltu.edu
  • teb@phys.hawaii.edu
  • qcampagn@go.olemiss.edu
  • §datta@phy.olemiss.edu
  • lmukherj@olemiss.edu
  • sdubey@hawaii.edu
  • **sibid@hawaii.edu

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Issue

Vol. 107, Iss. 1 — 1 January 2023

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