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P-wave contributions to B→ψππ decays in the perturbative QCD approach

Zhou Rui*

Ya Li†

Hsiang-nan Li‡

  • College of Sciences, North China University of Science and Technology, Tangshan, Hebei 063210, People’s Republic of China

  • Department of Physics, College of Science, Nanjing Agricultural University, Nanjing, Jiangsu 210095, People’s Republic of China

  • Institute of Physics, Academia Sinica, Taipei, Taiwan 115, Republic of China

  • *jindui1127@126.com
  • †liyakelly@163.com
  • ‡Corresponding author. hnli@phys.sinica.edu.tw
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Phys. Rev. D 98, 113003 – Published 7 December, 2018

DOI: https://doi.org/10.1103/PhysRevD.98.113003

Abstract

We present the differential branching fractions for the B→ψππ decays with the charmonia ψ=J/ψ,ψ(2S) in the invariant mass of the P-wave pion pairs in the perturbative QCD approach. The two-pion distribution amplitudes (DAs) corresponding to both longitudinal and transverse polarizations are constructed to capture important final state interactions in the processes. The timelike form factors, normalizing the two-pion DAs, contain contributions from the ρ resonance and radial excitations fitted to the BABAR e+e− annihilation data. Given the hadronic parameters for the two-pion DAs associated with the longitudinal polarization which were determined in our previous study, and tuning those associated with the transverse polarization, we accommodate well the observed branching ratios and polarization fractions of the B→J/ψππ decays. Our predictions for the B→ψ(2S)ππ modes from the same set of parameters can be tested in future LHCb and BelleII experiments. We also investigate the sources of theoretical uncertainties in our calculation.

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Phys. Rev. D 98, 113003– Published 7 December, 2018
  • Received 21 September 2018
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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.

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