Abstract
Recently there has been much interest in the tauonic semileptonic meson decays B→D+τ+ντ and B→D∗+τ+ντ, where one has found larger rates than what is predicted by the Standard Model. We analyze the corresponding semileptonic baryon decays Λb0→Λc++τ-+ν¯τ with particular emphasis on the lepton helicity flip and scalar contributions which vanish for zero lepton masses. We calculate the total rate, the differential decay distributions, the longitudinal and transverse polarization of the daughter baryon Λc+ and the τ lepton, and the lepton-side forward-backward asymmetries. The nonvanishing polarization of the daughter baryon Λc+ leads to hadron-side asymmetries in e.g. the decay Λc+→Λ0+π+ and azimuthal correlations between the two final-state decay planes which we specify. We provide numerical results on these observables using results of the covariant confined quark model. We find large lepton mass effects in the q2 spectra and in the polarization observables.
| Original language | English |
|---|---|
| Article number | 074001 |
| Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Volume | 91 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 3 Apr 2015 |
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ASJC Scopus subject areas
- Nuclear and High Energy Physics
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Semileptonic decay Λb → Λc+τ-+ ν ¯ τ in the covariant confined quark model SEMILEPTONIC DECAY ⋯ THOMAS GUTSCHE et al. / Gutsche, Thomas; Ivanov, Mikhail A.; Körner, Jürgen G.; Lyubovitskij, Valery E.; Santorelli, Pietro; Habyl, Nurgul.
In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 91, No. 7, 074001, 03.04.2015.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Semileptonic decay Λb → Λc+τ-+ ν ¯ τ in the covariant confined quark model SEMILEPTONIC DECAY ⋯ THOMAS GUTSCHE et al.
AU - Gutsche, Thomas
AU - Ivanov, Mikhail A.
AU - Körner, Jürgen G.
AU - Lyubovitskij, Valery E.
AU - Santorelli, Pietro
AU - Habyl, Nurgul
PY - 2015/4/3
Y1 - 2015/4/3
N2 - Recently there has been much interest in the tauonic semileptonic meson decays B→D+τ+ντ and B→D∗+τ+ντ, where one has found larger rates than what is predicted by the Standard Model. We analyze the corresponding semileptonic baryon decays Λb0→Λc++τ-+ν¯τ with particular emphasis on the lepton helicity flip and scalar contributions which vanish for zero lepton masses. We calculate the total rate, the differential decay distributions, the longitudinal and transverse polarization of the daughter baryon Λc+ and the τ lepton, and the lepton-side forward-backward asymmetries. The nonvanishing polarization of the daughter baryon Λc+ leads to hadron-side asymmetries in e.g. the decay Λc+→Λ0+π+ and azimuthal correlations between the two final-state decay planes which we specify. We provide numerical results on these observables using results of the covariant confined quark model. We find large lepton mass effects in the q2 spectra and in the polarization observables.
AB - Recently there has been much interest in the tauonic semileptonic meson decays B→D+τ+ντ and B→D∗+τ+ντ, where one has found larger rates than what is predicted by the Standard Model. We analyze the corresponding semileptonic baryon decays Λb0→Λc++τ-+ν¯τ with particular emphasis on the lepton helicity flip and scalar contributions which vanish for zero lepton masses. We calculate the total rate, the differential decay distributions, the longitudinal and transverse polarization of the daughter baryon Λc+ and the τ lepton, and the lepton-side forward-backward asymmetries. The nonvanishing polarization of the daughter baryon Λc+ leads to hadron-side asymmetries in e.g. the decay Λc+→Λ0+π+ and azimuthal correlations between the two final-state decay planes which we specify. We provide numerical results on these observables using results of the covariant confined quark model. We find large lepton mass effects in the q2 spectra and in the polarization observables.
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U2 - 10.1103/PhysRevD.91.074001
DO - 10.1103/PhysRevD.91.074001
M3 - Article
VL - 91
JO - Physical review D: Particles and fields
JF - Physical review D: Particles and fields
SN - 1550-7998
IS - 7
M1 - 074001
ER -