The EFFECTS OF a FAMILY NONUNIVERSAL Z′ BOSON ON B → Ππ DECAYS

Chang, Qin; Yang, Y. C.; Li, Xin-Qiang

doi:10.1142/s0217751x11051573

Cited by 11 publications

(3 citation statements)

References 135 publications

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“…Similar with the ππ, πK or ρρ puzzles discussed in Refs. [84,[95][96][97][98][99][100][101][102], the B → πρ puzzle has been noticed by some groups [103][104][105][106][107][108][109]. For example, in Ref.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Quasi-two-body decays B(s)→Pρ→Pππ in the perturbative QCD approach

Xiao

et al. 2017

Phys. Rev. D

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In this work, we calculate the CP -averaged branching ratios and the direct CP -violating asymmetries of the quasi-two-body decays B (s) → P (ρ →)ππ by employing the perturbative QCD (PQCD) approach (here P stands for a light pseudoscalar meson π, K, η or η ′ ). The vector current timelike form factor Fπ, which contains the final-state interactions between the pion pair in the resonant region associated with the P -wave states ρ(770) along with the two-pion distribution amplitudes, is employed to describe the interactions between the ρ and the pion pair under the hypothesis of the conserved vector current. We found that (a) the PQCD predictions for the branching ratios and the direct CP -violating asymmetries for most considered B (s) → P (ρ →)ππ decays agree with currently available data within errors, (b) for B(B → π 0 ρ 0 → π 0 (π + π − ), the PQCD prediction is much smaller than the measured one, and (c) for the B + → π + (ρ 0 →)π + π − decay mode, there is a negative CP asymmetry (−27.5 +3.0 −3.7 )%, which agrees with other theoretical predictions but is different in sign from those reported by BABAR and LHCb Collaborations.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

Quasi-two-body decays B(s)→Pρ→Pππ in the perturbative QCD approach

Xiao

et al. 2017

Phys. Rev. D

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“…It has been shown that models with an additional neutral gauge boson, so-called Z 0 models, not only explain ϵ 0 =ϵ [28][29][30][31][32][33], but also provide a promising solution to the B → Kπ puzzle [34][35][36][37][38][39][40], since they affect electroweak penguin operators [41,42]. Furthermore, the anomalies in b → sl þ l − data [43][44][45][46][47][48][49][50], which, using a global fit, convincingly point towards NP [51][52][53][54][55][56][57][58][59][60], can be explained within Z 0 models .…”

Section: Introductionmentioning

confidence: 99%

Z′ models with less-minimal flavor violation

et al. 2020

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We study the phenomenology of simplified Z 0 models with a global Uð2Þ 3 flavor symmetry in the quark sector, broken solely by the Standard Model Yukawa couplings. This flavor symmetry, known as lessminimal flavor violation, protects ΔF ¼ 2 processes from dangerously large new physics (NP) effects and at the same time provides a free complex phase in b → s transitions, allowing for an explanation of the hints for additional direct CP violation in kaon decays (ϵ 0 =ϵ) and in hadronic B-decays (B → Kπ puzzle). Furthermore, including the couplings of the Z 0 boson to the leptons, it is possible to address the intriguing hints for NP (above the 5σ level) in b → sl þ l − transitions. Taking into account all flavor observables in a global fit, we find that our model can (for the first time) provide a common explanation for ϵ 0 =ϵ, the B → Kπ puzzle and b → sl þ l − data. Sizeable CP violation in b → sl þ l − observables, in particular A 8 , is predicted, which can be tested in the near future, and an explanation of the B → Kπ and ϵ 0 =ϵ puzzles leads to effects in dijet tails at the LHC that are not far below the current limits. If we require that also b → sl þ l − anomalies are explained, cancellations in dimuon tails (possibly by a second Z 0) are needed to satisfy LHC data.

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“…[45,46] were also investigated in the same framework. The effects of the family non-universal Z gauge boson are also searched for in B → ππ decays in [47]. Recently, the B 0 s − B0 s mixing, B → K * l + l − , B s → μ + μ − , B → Kπ and inclusive B → X s l + l − decays have been analyzed and stronger constraints have been placed on the family non-universal Z model parameters in [48][49][50][51][52] (see also [33,34]).…”

Section: Introductionmentioning

confidence: 99%

Semileptonic transition of Σ_b→ Σμ⁺μ⁻in the family non-universalZ′ model

Katırcı

Azizi

2013

J. Phys. G: Nucl. Part. Phys.

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Using newly available form factors obtained from light-cone QCD sum rules in full theory, we study the flavor-changing neutral current transition of b → μ + μ − decay in the family non-universal Z model. In particular, we evaluate the differential branching ratio and forward-backward asymmetry, as well as some related asymmetry parameters and polarizations. We compare the obtained results with predictions of the standard model and discuss the sensitivity of the observables under consideration to the family non-universal Z gauge boson. The order of the differential branching ratio shows that this decay mode can be checked at the LHC in the near future.

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The EFFECTS OF a FAMILY NONUNIVERSAL Z′ BOSON ON B → Ππ DECAYS

Cited by 11 publications

References 135 publications

Quasi-two-body decays B(s)→Pρ→Pππ in the perturbative QCD approach

Quasi-two-body decays B(s)→Pρ→Pππ in the perturbative QCD approach

Z′ models with less-minimal flavor violation

Semileptonic transition of Σ_b→ Σμ⁺μ⁻in the family non-universalZ′ model

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The EFFECTS OF a FAMILY NONUNIVERSAL Z′ BOSON ON B → Ππ DECAYS

Cited by 11 publications

References 135 publications

Quasi-two-body decays B(s)→Pρ→Pππ in the perturbative QCD approach

Quasi-two-body decays B(s)→Pρ→Pππ in the perturbative QCD approach

Z′ models with less-minimal flavor violation

Semileptonic transition of Σb→ Σμ+μ−in the family non-universalZ′ model

Contact Info

Product

Resources

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Semileptonic transition of Σ_b→ Σμ⁺μ⁻in the family non-universalZ′ model