Nonleptonic two-body weak decays of 
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 in a modified MIT bag model

Geng, Chao–Qiang; Liu, Chia-Wei; Tsai, Tien-Hsueh

doi:10.1103/physrevd.102.034033

Cited by 26 publications

(30 citation statements)

References 34 publications

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“…In this study, we calculate them with the modified MIT bag model [44], in which the center motions of the baryon waves are removed. The hadrons parameters are given as [44,54] m b = 4.8 GeV, m s = 0.28 GeV, m u = m d = 0.005 GeV , R −1 = 0.21 ± 0.01GeV , (4.7) where R is the bag radius, and (f φ , f ω , f ρ ) = (215 ± 5, 187 ± 5, 216 ± 3) MeV [55] . The numerical results of the form factors with the q 2 dependencies are given in table 3.…”

Section: Jhep11(2021)104mentioning

confidence: 99%

“…In refs. [41][42][43][44], the generalized factorization approach has been considered, in which the renormalization dependence of the Wilson coefficients has been absorbed into the effective ones in the next to leading log precision [45]. However, the effective color number, found as N c ≈ 2 in the decays of B mesons, has to be included to parametrize the NF effects in the branching ratios.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Jhep11(2021)104mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Time-reversal asymmetries and angular distributions in Λb → ΛV

Geng

Liu

2021

J. High Energ. Phys.

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“…(2.21) from the modified bag model [48] with the numerical results given in table 1, 1 where the first and second uncertainties in the branching ratios come from the bag radius of R = (4.8 ± 0.2 GeV) −1 [48] and CKM elements [29], respectively. In particular, the T violating asymmetries are found to be , where the first and second uncertainties in the branching ratios come from the bag radius [48] and CKM elements [29], respectively.…”

Section: Jhep01(2022)128mentioning

confidence: 91%

“…To get the more precise results, we adopt the generalized factorization approach, in which the renormalization dependency in the naive factorization has been absorbed into the effective Wilson coefficients to the next to leading log precision [66]. Accordingly, the color-enhanced amplitudes are given as [42,43,48,54]…”

Section: Jhep01(2022)128mentioning

confidence: 99%

“…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%

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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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Semileptonic decays of anti-triplet charmed baryons

et al. 2019

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We study the semileptonic decays B c → B n ℓ + ν ℓ where B c(n) is the anti-triplet-charmed (octet) baryon with the SU (3) f flavor symmetry and helicity formalism. In particular, we present the decay branching ratios of B c → B n ℓ + ν ℓ in three scenarios: (a) an exact SU (3) f symmetry with equal masses for the anti-triplet-charmed (octet) baryon states of B c (B n ), (b) SU (3) f parameters without the baryonic momentum-transfer dependence, and (c) SU (3) f with baryonic transition form factors in the heavy quark limit. We show that our results are all consistent with the existing data. Explicitly, we predict that B(Ξ + c → Ξ 0 e + ν e ) = (11.9 ± 1.3, 9.8 ± 1.1, 10.7 ± 0.9) × 10 −2 and B(Ξ 0 c → Ξ − e + ν e ) = (3.0 ± 0.3, 2.4 ± 0.3, 2.7 ± 0.2) × 10 −2 in the scenarios (a), (b) and (c) agree with the data of (14.0 +8.3 −8.7 ) × 10 −2 and (5.6 ± 2.6) × 10 −2 from the CLEO Collaboration, respectively. In addition, we obtain that B(Λ + c → ne + ν e ) = (2.8 ± 0.4, 4.9 ± 0.4, 5.1 ± 0.4) × 10 −3 in (a), (b) and (c).We also examine the longitudinal asymmetry parameters of α(B c → B n ℓ + ν ℓ ), which are sensitive to the different scenarios with SU (3) f . Some of the decay branching ratios and asymmetries can be observed by the ongoing experiments at BESIII and LHCb as well as the future searches by BELLEII.

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Nonleptonic two-body weak decays of Λb in a modified MIT bag model

Cited by 26 publications

References 34 publications

Time-reversal asymmetries and angular distributions in Λb → ΛV

Time-reversal asymmetries and angular distributions in Λb → ΛV

Sizable time-reversal violating effects in bottom baryon decays

Semileptonic decays of anti-triplet charmed baryons

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