Charmed baryon weak decays with vector mesons

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

doi:10.1103/physrevd.101.053002

Cited by 26 publications

(20 citation statements)

References 78 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where 1=γ 3 comes from the Jacobian in Eq. (21), and ⃗p and ⃗p 0 are the 3-momenta of the baryons. Here, we have used the fact that the integral does not vanish if and only if v ¼ v 0 to reduce the complexity in ϕ.…”

Section: Baryon Wave Functionsmentioning

confidence: 99%

“…Such a defect makes the model questionable when one discusses the decay processes involving essentially the momentum eigenstates. Nonetheless, many calculations in the bag model have been done by ignoring this problem [16][17][18][19][20][21][22]. In this work, we will modify the MIT bag model to construct the momentum eigenstates for the baryons to study the decays without introducing extra parameters.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Geng¹,

Liu

Tsai

2020

Phys. Rev. D

Self Cite

View full text Add to dashboard Cite

We study the nonleptonic two-body weak decays of Λ b by modifying the MIT bag model without introducing new parameters to construct the momentum eigenstates of the baryons. We find that the branching ratios of Λ 0 b → Λ þ c π − , Λ þ c K − , pπ − , and pK − are ð4.5 AE 0.2Þ × 10 −3 , ð3.4 AE 0.1Þ × 10 −4 , ð5.0 AE 0.5Þ × 10 −6 , and ð6.0 AE 0.7Þ × 10 −6 , which are all consistent with the current experimental data, respectively. We also explore P and CP asymmetries for the decays of Λ 0 b → pðπ − ; K − Þ. In particular, we obtain that the direct CP-violating rate asymmetries in Λ 0 b → pπ − and Λ 0 b → pK − are around −4.4% and 6.7%, in comparison with ð−2.5 AE 2.9Þ% and ð−2.5 AE 2.2Þ% from the Particle Data Group in 2020, respectively.

show abstract

Section: Baryon Wave Functionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Geng¹,

Liu

Tsai

2020

Phys. Rev. D

Self Cite

View full text Add to dashboard Cite

show abstract

“…In two or three-body decays, T-odd observables can be constructed in the spin correlations among the particles [1][2][3][4][5][6][7][8][9][10]. Since the particle spins could not be directly measured in the current high energy physics experiments, we have to extract their effects through the angular distributions in the cascade decays [11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Time-reversal asymmetries and angular distributions in Λb → ΛV

Geng

Liu

2021

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…One is the irreducible SU(3) f approach (IRA), where the effective Hamiltonian (H eff ) for the c quark decays can be presented as the irreducible SU(3) f expression. As a consequence, H eff connected to B c and the final states induces the SU(3) f invariant amplitudes [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. The other is the topological-diagram approach (TDA) [36][37][38][39][40], where the W -boson emission (W EM ) and W -boson exchange (W EX ) effects can be drawn and parameterized as the topological amplitudes.…”

Section: Introductionmentioning

confidence: 99%

Equivalent SU(3)f approaches for two-body anti-triplet charmed baryon decays

Hsiao

Wang

Zhao

2022

J. High Energ. Phys.

View full text Add to dashboard Cite

For the two-body Bc → BM decays, where Bc denotes the anti-triplet charm baryon and B(M) the octet baryon (meson), there exist two theoretical studies based on the SU(3) flavor [SU(3)f] symmetry. One is the irreducible SU(3)f approach (IRA). In the irreducible SU(3)f representation, the effective Hamiltonian related to the initial and final states forms the amplitudes for Bc → BM. The other is the topological-diagram approach (TDA), where the W-boson emission and W-boson exchange topologies are drawn and parameterized for the decays. As required by the group theoretical consideration, we present the same number of the IRA and TDA amplitudes. We can hence relate the two kinds of the amplitudes, and demonstrate the equivalence of the two SU(3)f approaches. We find a specific W-boson exchange topology only contributing to $$ {\Xi}_c^0 $$ Ξ c 0 →BM. Denoted by EM, it plays a key role in explaining $$ \mathcal{B} $$ B ($$ {\Xi}_c^0 $$ Ξ c 0 → Λ0$$ {K}_S^0 $$ K S 0 , Σ0$$ {K}_S^0 $$ K S 0 , Σ+K−). We consider that $$ {\Lambda}_c^{+} $$ Λ c + → nπ+ and $$ {\Lambda}_c^{+} $$ Λ c + → pπ0 proceed through the constructive and destructive interfering effects, respectively, which leads to $$ \mathcal{B} $$ B ($$ {\Lambda}_c^{+} $$ Λ c + → nπ+) » $$ \mathcal{B} $$ B ($$ {\Lambda}_c^{+} $$ Λ c + → pπ0) in agreement with the data. With the exact and broken SU(3)f symmetries, we predict the branching fractions of Bc→BM to be tested by future measurements.

show abstract

Charmed baryon weak decays with vector mesons

Cited by 26 publications

References 78 publications

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

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

Time-reversal asymmetries and angular distributions in Λb → ΛV

Equivalent SU(3)f approaches for two-body anti-triplet charmed baryon decays

Contact Info

Product

Resources

About