𝚲𝒄 → 𝚲 form factors in lattice QCD

BAHTİYAR, Hüseyin

doi:10.3906/fiz-2104-28

Cited by 11 publications

(6 citation statements)

References 41 publications

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“…The use of perturbative calculations is at the boundary of applicability. It is believed that lattice QCD will ultimately provide reliable theoretical results [15][16][17]. But it is still far from reaching that goal.…”

Section: Introductionmentioning

confidence: 99%

A global analysis of charmless two body hadronic decays for anti-triplet charmed baryons

Huang

Xing

2022

J. High Energ. Phys.

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Recently Belle collaboration reported new measurements for the branching fractions with the first observing two processes of $$ \mathcal{B}\left({\Xi}_c^0\to \Lambda {K}_S^0\right) $$ B Ξ c 0 → Λ K S 0 , $$ \mathcal{B}\left({\Xi}_c^0\to {\Sigma}^0{K}_S^0\right) $$ B Ξ c 0 → Σ 0 K S 0 and updating data for $$ \mathcal{B}\left({\Xi}_c^0\to {\Sigma}^{+}{K}^{-}\right) $$ B Ξ c 0 → Σ + K − . Combined with other known data on charmless two body decays of anti-triplet charmed baryons, a lot of information can be derived with the assistance of SU(3) flavour symmetry. Using SU(3) relations between different decay modes, we can give some predictions based on the new measurements which can be tested with the high luminosity experiments in the future. More interestingly, we find that a global fit is now possible with the addition of new Belle data. In general, there are 18 complex SU(3) invariant amplitudes. We find that a scenario of all amplitudes being real can fit the data well with a χ2/d.o.f. only 0.773. This indicates that neglecting the phases of the amplitudes is a reasonable assumption. When more data become available, one may be able to get more information for phases in the amplitudes. We give several comments on the feature of global fit regarding the branching fractions, relations between different decays, and decays involving K0 and $$ \overline{K} $$ K ¯ 0. Many of the unknown branching fractions and polarization asymmetry parameters of anti-triplet charmed baryon for charmless two body decays are predicted to be accessible by experiments at Belle, Belle II, BES-III, and LHCb. The validity of SU(3) for charmless two body hadronic decays can be more accurately tested.

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Section: Introductionmentioning

confidence: 99%

A global analysis of charmless two body hadronic decays for anti-triplet charmed baryons

Huang

Xing

2022

J. High Energ. Phys.

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“…For baryonic modes there are a number of form factor computations, e.g. lattice [10][11][12][13][14] and sum rules [15,16], but no long-distance computations in QCD-factorisation or light-cone sum rules. 1 Alternatively, it can be viewed as the partial wave expansion applied to effective field theories.…”

Section: Jhep11(2021)073 1 Introductionmentioning

confidence: 99%

Endpoint relations for baryons

Hiller

Zwicky

2021

J. High Energ. Phys.

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Following our earlier work we establish kinematic endpoint relations for baryon decays using the Wigner-Eckart theorem and apply them to $$ \frac{1}{2}\to \frac{1}{2} $$ 1 2 → 1 2 and $$ \frac{1}{2}\to \frac{3}{2} $$ 1 2 → 3 2 baryon transitions. We provide angular distributions at the kinematic endpoint which hold for the generic d = 6 model-independent effective Hamiltonian and comment on the behaviour in the vicinity of the endpoint. Moreover, we verify the endpoint relations, using an explicit form factor parametrisation, and clarify constraints on helicity-based form factors to evidence endpoint relations. Our results provide guidance for phenomenological parameterisations, consistency checks for theory computations and experiment. Results are applicable to ongoing and future new physics searches at LHCb, BES III and Belle II with rare semileptonic-, dineutrino-and charged-modes, which include Λb → Λ(*)ℓℓ, Λb → Λ(*)νν, Ωb → Ωℓℓ, Λc → pℓℓ, Σ → pℓℓ and Λb → $$ {\Lambda}_c^{\left(\ast \right)} $$ Λ c ∗ ℓν.

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“…In recent years, significant progress has been achieved in the study of Λ + c SL decays, both experimentally [5][6][7] and theoretically [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. In 2015, the BESIII collaboration reported the first measurement of the absolute branching fraction (BF) for Λ + c → Λe + ν e with B(Λ + c → Λe + ν e ) = (3.63 ± 0.38 stat.…”

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confidence: 99%

“…Reference [14] also investigated the internal dynamics and predicted the form factors and differential decay rates in Λ + c → Λe + ν e decay. This was followed by a series of other LQCD calculations [22][23][24][25] in this sector. This theoretical work is important for understanding the decay mechanism in SL decays in the charmed baryon sector.…”

mentioning

confidence: 99%

Study of the Semileptonic Decay $Λ_c^+\rightarrow Λe^+ν_e$

Ablikim¹,

Achasov²,

Adlarson³

et al. 2022

Preprint

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The measurement of the Cabibbo-favored semileptonic decay Λ + c → Λe + νe is reported using a 4.5 fb −1 data sample of e + e − annihilations collected at center-of-mass energies ranging from 4.600 GeV to 4.699 GeV with the BESIII detector at the BEPCII collider. The branching fraction of the decay is measured to be B(Λ + c → Λe + νe) = (3.56 ± 0.11stat. ± 0.07syst.)%, which is the most precise measurement to date. Furthermore, we perform an investigation of the internal dynamics in Λ + c → Λe + νe. We provide the first direct comparisons of the differential decay rate and form factors with those predicted from lattice quantum chromodynamics (LQCD) calculations. Combining the measured branching fraction with a q 2 -integrated rate predicted by LQCD, we determine |Vcs| = 0.936 ± 0.017B ± 0.024LQCD ± 0.007τ Λc .

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𝚲𝒄 → 𝚲 form factors in lattice QCD

Cited by 11 publications

References 41 publications

A global analysis of charmless two body hadronic decays for anti-triplet charmed baryons

A global analysis of charmless two body hadronic decays for anti-triplet charmed baryons

Endpoint relations for baryons

Study of the Semileptonic Decay $Λ_c^+\rightarrow Λe^+ν_e$

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