Time-reversal asymmetries and angular distributions in Λb → ΛV

Geng, Chao–Qiang; Liu, Chia-Wei

doi:10.1007/jhep11(2021)104

Cited by 11 publications

(12 citation statements)

References 60 publications

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“…spin [55][56][57][58][59][60][61][62]. However, there are some defects in the complex phase approach.…”

Section: Jhep01(2022)128mentioning

confidence: 99%

“…The relation between phases and TV is not intuitively understandable. In addition, the analyses of the TPAs carried out in the literature suffer a theoretical inconsistency [62].…”

Section: Jhep01(2022)128mentioning

confidence: 99%

“…resulting in that the TVEs are suppressed because the decays are dominated by a single helicity state [62]. In contrast, in B b → B n P , the pseudoscalar meson matrix elements are enhanced by the smallness of the light quark masses, given by…”

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%

“…Since J are always conserved, one can identify them as the spins of B b . The eigenstates of T are related to the helicity ones as[62]…”

mentioning

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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“…spin [55][56][57][58][59][60][61][62]. However, there are some defects in the complex phase approach.…”

Section: Jhep01(2022)128mentioning

confidence: 99%

“…The relation between phases and TV is not intuitively understandable. In addition, the analyses of the TPAs carried out in the literature suffer a theoretical inconsistency [62].…”

Section: Jhep01(2022)128mentioning

confidence: 99%

Section: Jhep01(2022)128mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Since J are always conserved, one can identify them as the spins of B b . The eigenstates of T are related to the helicity ones as[62]…”

mentioning

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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Center of mass motion in bag model

Liu

Geng

2023

Chinese Phys. C

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Despite the great success on the mass spectra, the reputation of the bag model has been closely followed by the embarrassment from the center of mass motion. It leads to severe theoretical inconsistencies. For instance, the masses and the decay constants would no longer be independent of the momentum. In this work, we provide a systematical approach to resolve this problem. The meson decay constants as well as the baryon transition form factors can be computed consistently in our framework. Notably, the form factors in the neutron $\beta$ decays do not depend on any free parameters, and are determined to be $F^V_1 =1 $ and $F^A_1 = 1.31$ or $F_1^A/F_1^V= 1.31$, which is close the experimental value of $F^A_1/F^V_1 = 1.27$. In addition, we find that ${\cal B} (\Lambda_b \to \Lambda \gamma) = (6.8 \pm 3.3 ) \times 10^{-6} $, which agrees to the experimental value of $(7.1\pm 1.7)\times 10^{-6}$. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

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Time-reversal asymmetries in *

Geng 耿,

Liu 刘,

Wei 魏

2024

Chinese Phys. C

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We study the decays of $\Lambda_b \to \Lambda(\to p \pi^-) \ell ^+ \ell^-$ with $\ell = (e, \mu, \tau)$. We examine the full angular distributions with polarized $\Lambda_b$, where the T-odd observables are identified. We discuss the possible effects of new physics~(NP) and find that the T-odd observables are sensitive to them as they vanish in the standard model. Special attentions are given to the interference of (pseudo)scalar operators with (axial)vector operators in polarized$\Lambda_b \to \Lambda(\to p \pi^-) \tau^+ \tau^-$, which are studied in the first time.Their effects are proportional to the lepton masses and thereforemay evade the constraint from $\Lambda_b \to \Lambda(\to p \pi^-) \mu^+ \mu^-$ at LHCb naturally. As $\Lambda_b \to \Lambda(\to p \pi^-) \tau^+ \tau^-$ is uncontaminated by the charmonia resonance, it provides a clean background to probe NP. In addition, we show that the experimental central value of $K_{10}$ in $\Lambda_b \to \Lambda(\to p \pi^-) \mu^+ \mu^-$ at LHCb can be explained by the NP case, which couples to the right-handed quarks and leptons.The polarization fraction of $\Lambda_b$ at LHCb is found to be consistent with zero regardless to the NP scenarios. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

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Time-reversal asymmetries and angular distributions in Λb → ΛV

Cited by 11 publications

References 60 publications

Sizable time-reversal violating effects in bottom baryon decays

Sizable time-reversal violating effects in bottom baryon decays

Center of mass motion in bag model

Time-reversal asymmetries in *

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