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doi:10.1103/physrevd.84.031102

Cited by 24 publications

(7 citation statements)

References 36 publications

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“…Ã þ J=c Þ for which the PDG quotes an average value of ð5:8 AE 0:8Þ Â 10 À4 [11]. The latter was deduced from the measurements by the CDF [12] and D0 Collaborations [13]. In this paper we present a detailed analysis of the decay process Ã b !…”

Section: Introductionmentioning

confidence: 94%

Polarization effects in the cascade decayΛb→Λ(→pπ−)+J/ψ<

et al. 2013

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We calculate the invariant and helicity amplitudes for the nonleptonic decay Ã b ! Ã þ J=c , c ð2SÞ in the covariant confined quark model. We discuss joint angular decay distributions in the cascade decay Ã b ! Ãð! p À Þ þ J=c , c ð2SÞð! ' þ ' À Þ and calculate some of the asymmetry parameters that characterize the joint angular decay distribution. We confirm expectations from the naive quark model that the transitions into the Ã ¼ 1=2 helicity states of the daughter baryon Ã are strongly suppressed leading to a near maximal negative polarization of the Ã. For the same reason the azimuthal correlation between the two decay planes spanned by (p À ) and (' þ ' À ) is negligibly small. We provide form factor results for the whole accessible q 2 range. Our results are close to lattice results at minimum recoil and light-cone sum rule results at maximum recoil. A new feature of our analysis is that we include lepton mass effects in the calculation, which allows us to also describe the cascade decay Ã b ! Ãð! p À Þ þ c ð2SÞð! þ À Þ.

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Section: Introductionmentioning

confidence: 94%

Polarization effects in the cascade decayΛb→Λ(→pπ−)+J/ψ<

et al. 2013

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“…In Ref. [1], the relevant results averaging the measurements by CDF and D0 [13][14][15][16], are given as…”

Section: Status Of F B / F Bmentioning

confidence: 99%

Fragmentation-fraction ratio $$f_{\Xi _b}/f_{\Lambda _b}$$ f Ξ b / f Λ

Jiang

2018

Eur. Phys. J. C

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We study the ratio of fragmentation fractions, f b / f b , from the measurement of 0 b → + c π − and 0 b → + c π − with + c / + c → pK − π +. With the branching fraction B(+ c → pK − π +) = (2.2 ± 0.8)% obtained under the U-spin symmetry, the fragmentation ratio is determined as f b / f b = 0.054 ± 0.020. To reduce the above uncertainties, we suggest to measure the branching fractions of + c → pK * 0 and + c → + K * 0 at BESIII, Belle II and LHCb.

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“…There is no experimental measurement of the above three processes, however the available data indicates [29,30], where Λ is the ground state. Using the estimate of the fragmentation fraction B(b → Λ b ) = 0.175 ± 0.106 [31], one can obtain:…”

Section: A Transition Form Factorsmentioning

confidence: 99%

Angular distributions for $Λ_b\to Λ^*_J (pK^-)J/ψ$ Decays

Xing¹,

Huang²,

Wang³

2022

Preprint

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We carry out an analysis of the multibody decay cascade Λ b → Λ * J J/ψ → pK − J/ψ with the Λ * J resonance including Λ * 1520 , Λ * 1600 , and Λ * 1800 , and J/ψ reconstructed by the lepton pair final state. Using the helicity amplitude technique, we derive a compact form for the angular distributions for the decay chain, from which one can extract various one-dimensional distributions. Using the Λ b → Λ * J form factors from Lattice QCD and quark model, we calculate the differential and integrated partial widths. Decay branching fractions are found as B(Λ b → pKµ + µ − ) = (1.41 ± 0.31) × 10 −5 , B(Λ b → pKe + e − ) = (1.41±0.32)×10 −5 . In addition, we also explore forward-backward asymmetry, and various polarizations. Results in this work will serve a calibration for the study of b → sμµ decays in Λ b decays in future and provide useful information towards the understanding of the properties of the Λ * J baryons.

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Measurement of the production fraction times branching fractionf(b→Λb)·B(Λb→J

Cited by 24 publications

References 36 publications

Polarization effects in the cascade decayΛb→Λ(→pπ−)+J/ψ<

Polarization effects in the cascade decayΛb→Λ(→pπ−)+J/ψ<

Fragmentation-fraction ratio $$f_{\Xi _b}/f_{\Lambda _b}$$ f Ξ b / f Λ

Angular distributions for $Λ_b\to Λ^*_J (pK^-)J/ψ$ Decays

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