Joint angular decay distributions in exclusive weak decays of heavy mesons and baryons

Białas, P.; Körner, Jürgen; Krämer, M.; Zalewski, K.

doi:10.1007/bf01555745

Cited by 87 publications

(86 citation statements)

References 21 publications

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“…(3.11) Although the case with a polarized Λ b can bring in a number of new observables [101,102], we assume here that the parent baryon Λ b is unpolarized, based on the observation that the Λ b polarization in the LHCb setup is measured to be small and compatible with zero [103]. This leaves with us the above interesting observables.…”

Section: Jhep02(2017)068mentioning

confidence: 99%

Λ b → Λ c τ ν ¯ τ $$ {\varLambda}_b\to {\varLambda}_c\tau {\overline{\nu}}_{\tau } $$ decay in scalar and vector leptoquark scenarios

Yang

Zhang

2017

J. High Energ. Phys.

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Section: Jhep02(2017)068mentioning

confidence: 99%

Λ b → Λ c τ ν ¯ τ $$ {\varLambda}_b\to {\varLambda}_c\tau {\overline{\nu}}_{\tau } $$ decay in scalar and vector leptoquark scenarios

Yang

Zhang

2017

J. High Energ. Phys.

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“…The full angular probability density function (PDF) of the decay angles Ω ¼ ðθ; ϕ; θ 1 ; ϕ 1 ; θ 2 ; ϕ 2 Þ is [15,17,18] wðΩ;Ã; PÞ ¼ 1…”

Section: Introductionmentioning

confidence: 99%

Measurement of the parity-violating asymmetry parameterαband the helicity amplitudes for the decayΛb
Buanes¹,
Dale²,
Eigen³
et al. 2014
Phys. Rev. D
32
5
22
0
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A measurement of the parity-violating decay asymmetry parameter, α b , and the helicity amplitudes for the decay Λ 0 b → J=ψðμ þ μ − ÞΛ 0 ðpπ − Þ is reported. The analysis is based on 1400 Λ 0 b andΛ 0 b baryons selected in 4.6 fb −1 of proton-proton collision data with a center-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. By combining the Λ 0 b andΛ 0 b samples under the assumption of CP conservation, the value of α b is measured to be 0.30 AE 0.16ðstatÞ AE 0.06ðsystÞ. This measurement provides a test of theoretical models based on perturbative QCD or heavy-quark effective theory.

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“…At the time being only charmed and beautiful Λ baryons seem to offer a practical method to measure the polarisation of the corresponding heavy quarks. This method proposed by Bjorken [9] has been successfully applied to both semileptonic [10] and hadronic [11] decays of Lambda baryons. The polarisation transfer from a heavy quark Q to the corresponding Λ Q baryon is 100% [12], at least in the limit m Q → ∞.…”

Section: Introductionmentioning

confidence: 99%

Distributions of leptons in decays of polarised heavy quarks

Czarnecki

Jeżabek

1994

Nuclear Physics B

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Analytic formulae are given for QCD corrections to the lepton spectra in decays of polarised up and down type heavy quarks. These formulae are much simpler than the published ones for the corrections to the spectra of charged leptons originating from the decays of unpolarised quarks and polarised up type quarks. Distributions of leptons in semileptonic Λ c and Λ b decays can be used as spin analysers for the corresponding heavy quarks. Thus our results can be applied to the decays of polarised charm and bottom quarks. For the charged leptons the corrections to the asymmetries are found to be small in charm decays whereas for bottom decays they exhibit a non-trivial dependence on the energy of the charged lepton. Short life-time enables polarisation studies for the top quark. Our results are directly applicable for processes involving polarised top quarks.

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Joint angular decay distributions in exclusive weak decays of heavy mesons and baryons

Cited by 87 publications

References 21 publications

Λ b → Λ c τ ν ¯ τ $$ {\varLambda}_b\to {\varLambda}_c\tau {\overline{\nu}}_{\tau } $$ decay in scalar and vector leptoquark scenarios

Λ b → Λ c τ ν ¯ τ $$ {\varLambda}_b\to {\varLambda}_c\tau {\overline{\nu}}_{\tau } $$ decay in scalar and vector leptoquark scenarios

Measurement of the parity-violating asymmetry parameterαband the helicity amplitudes for the decayΛb
Buanes¹,
Dale²,
Eigen³
et al. 2014
Phys. Rev. D
32
5
22
0
View full text Add to dashboard Cite

Distributions of leptons in decays of polarised heavy quarks

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Joint angular decay distributions in exclusive weak decays of heavy mesons and baryons

Cited by 87 publications

References 21 publications

Λ b → Λ c τ ν ¯ τ $$ {\varLambda}_b\to {\varLambda}_c\tau {\overline{\nu}}_{\tau } $$ decay in scalar and vector leptoquark scenarios

Λ b → Λ c τ ν ¯ τ $$ {\varLambda}_b\to {\varLambda}_c\tau {\overline{\nu}}_{\tau } $$ decay in scalar and vector leptoquark scenarios

Measurement of the parity-violating asymmetry parameterαband the helicity amplitudes for the decayΛbBuanes1, Dale2, Eigen3 et al. 2014Phys. Rev. D325220View full textAdd to dashboardCite

Distributions of leptons in decays of polarised heavy quarks

Contact Info

Product

Resources

About

Measurement of the parity-violating asymmetry parameterαband the helicity amplitudes for the decayΛb
Buanes¹,
Dale²,
Eigen³
et al. 2014
Phys. Rev. D
32
5
22
0
View full text Add to dashboard Cite