Nonleptonic beauty baryon decays and 
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 asymmetries based on an 
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-flavor analysis

Roy, Shibasis; Sinha, Rahul; Deshpande, N. G.

doi:10.1103/physrevd.101.036018

Cited by 16 publications

(12 citation statements)

References 104 publications

(69 reference statements)

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“…B b (3) → B(10) P (8), based on SU (3) decomposition of the decay amplitudes in a general framework. This extends our previous analysis [88] of the anti-triplet beauty baryon decays into the octet or singlet of a light baryon and a pseudoscalar meson and completes the application of the method to decays involving any non-charmed baryon. We have shown that in the most general case, the forty distinct decay modes require forty independent reduced SU (3) amplitudes to describe all possible ∆S = −1 and ∆S = 0 processes.…”

Section: Discussionsupporting

confidence: 76%

“…An alternate approach based on the flavor flow along quark lines is also presented, which is equivalent to the SUð3Þ decomposition in the limit of an exact SUð3Þ-flavor symmetry. In contrast to previous studies, our approach [19,87,88] facilitates an SUð3Þ decomposition of the decays in terms of SUð3Þ-reduced amplitudes without any particular set of assumptions about the underlying dynamics.…”

Section: Introductionmentioning

confidence: 99%

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Beauty baryon nonleptonic decays into decuplet baryons and CP -asymmetries based on an SU(3) -flavor analysis

2020

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We consider charmless weak decays of beauty baryons into decuplet baryons and pseudoscalar mesons in a general framework based on the SUð3Þ-flavor decomposition of the decay amplitudes. The dynamical assumption independent SUð3Þ analysis accounts for the effects of an arbitrarily broken SUð3Þ symmetry in these decays. An alternative approach in terms of quark diagrams is also provided and compared with the SUð3Þ decomposition in the limit of an exact SUð3Þ-flavor symmetry. Furthermore, the symmetries of the effective Hamiltonian is used to relate or neglect reduced SUð3Þ amplitudes to derive several sum rule relations between amplitudes and relations between CP asymmetries in these decays and identify those that hold even if SUð3Þ is broken.

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Section: Discussionsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Beauty baryon nonleptonic decays into decuplet baryons and CP -asymmetries based on an SU(3) -flavor analysis

2020

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“…On the theoretical side, to deal with Λ b decays, various approaches have been made [34][35][36][37][38]. The most simple one is the naive factorization [18,19,39,40], in which the mesons are produced from weak vertices directly.…”

Section: Introductionmentioning

confidence: 99%

Time-reversal asymmetries and angular distributions in Λb → ΛV

Geng

Liu

2021

J. High Energ. Phys.

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We study the spin correlations to probe time-reversal (T) asymmetries in the decays of Λb→ ΛV (V = ϕ, ρ0, ω, K∗0). The eigenstates of the T-odd operators are obtained along with definite angular momenta. We obtain the T-odd spin correlations from the complex phases among the helicity amplitudes. We give the angular distributions of Λb→ Λ(→ pπ−)V (→ PP′) and show the corresponding spin correlations, where P(′) are the pseudoscalar mesons. Due to the helicity conservation of the s quark in Λ, we deduce that the polarization asymmetries of Λ are close to −1. Since the decay of Λb→ Λϕ in the standard model (SM) is dictated by the single weak phase from the product of CKM elements, $$ {V}_{tb}{V}_{ts}^{\ast } $$ V tb V ts ∗ , the true T and CP asymmetries are suppressed, providing a clean background to test the SM and search for new physics. In the factorization approach, as the helicity amplitudes in the SM share the same complex phase, T-violating effects are absent. Nonetheless, the experimental branching ratio of Br(Λb→ Λϕ) = (5.18 ± 1.29) × 10−6 suggests that the nonfactorizable effects or some new physics play an important role. By parametrizing the nonfactorizable contributions with the effective color number, we calculate the branching ratios and direct CP asymmetries. We also explore the possible T-violating effects from new physics.

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“…Clearly, the experimental progresses on B b result in a great opportunity for us to explore TV in the two-body decays of B b . On the theoretical side for B b decays, many efforts have been made [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54], but only few of them have discussed TVEs [55][56][57][58][59][60][61][62]. For the weak transitions described by the effective Hamiltonian (H eff ) [63], based on the Hermitian nature of H eff and T-symmetry, we have the complex phase approach with…”

Section: Introductionmentioning

confidence: 99%

Sizable time-reversal violating effects in bottom baryon decays

Liu¹,

Geng²

2022

J. High Energ. Phys.

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We study time-reversal (T) asymmetries in the charmless two-body decays of antitriplet bottom baryons. We find that in Bb → BnP with Bb = ($$ {\Xi}_b^{-} $$ Ξ b − ,$$ {\Xi}_b^0 $$ Ξ b 0 , Λb) and Bn(P) a octet baryon (pseudoscalar meson), the positive and negative helicity amplitudes are both sizable, resulting in the large T-violating effects. Particularly, the T-odd parameters, βw, for the color-enhanced channels are expected to be around −40% and 25% in b → s and b → d transitions for the standard model, which can be measured by the experiments at LHCb, respectively. On the other hand, in Bb → BnV(γ) with V(γ) a vector meson (photon), the decays are predominated by a single helicity amplitude, and the T violating effects by the correlations among spins are suppressed. We also explore the T violating observables for the Ξb decays based on the angular distributions.

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Nonleptonic beauty baryon decays and CP asymmetries based on an SU(3) -flavor analysis

Cited by 16 publications

References 104 publications

Beauty baryon nonleptonic decays into decuplet baryons and CP -asymmetries based on an SU(3) -flavor analysis

Beauty baryon nonleptonic decays into decuplet baryons and CP -asymmetries based on an SU(3) -flavor analysis

Time-reversal asymmetries and angular distributions in Λb → ΛV

Sizable time-reversal violating effects in bottom baryon decays

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