Abstract
We present, for the first time, the six-fold differential decay density expression for \( {\varLambda}_b^0\to {\varLambda}_c^{+}\mu {\ell}^{-}{\overline{v}}_{\ell } \), taking into account the polarisation of the \( {\varLambda}_b^0 \) baryon and a complete basis of new physics operators. Using the expected yield in the current dataset collected at the LHCb experiment, we present sensitivity studies to determine the experimental precision on the Wilson coefficients of the new physics operators with \( {\varLambda}_b^0\to {\varLambda}_c^{+}{\mu}^{-}{\overline{v}}_{\mu } \) decays in two scenarios. In the first case, unpolarised \( {\varLambda}_b^0\to {\varLambda}_c^{+}{\mu}^{-}{\overline{v}}_{\mu } \) decays with \( {\varLambda}_c^{+} \)→ pK + π− are considered, whereas polarised \( {\varLambda}_b^0\to {\varLambda}_c^{+}{\mu}^{-}{\overline{v}}_{\mu } \) decays with \( {\varLambda}_c^{+} \)→\( p{K}_{\mathrm{S}}^0 \) are studied in the second. For the latter scenario, the experimental precision that can be achieved on the de-termination of \( {\varLambda}_b^0 \) polarisation and \( {\varLambda}_c^{+} \) weak decay asymmetry parameter is also presented.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
BaBar collaboration, Evidence for an excess of \( \overline{B} \)→ D(∗)τ− \( \overline{v} \)τdecays, Phys. Rev. Lett.109 (2012) 101802 [arXiv:1205.5442] [INSPIRE].
BaBar collaboration, Measurement of an Excess of \( \overline{B} \)→ D(∗)τ− \( \overline{v} \)τDecays and Implications for Charged Higgs Bosons, Phys. Rev.D 88 (2013) 072012 [arXiv:1303.0571] [INSPIRE].
Belle collaboration, Measurement of the branching ratio of \( \overline{B} \)→ D(∗)τ− \( \overline{v} \)τrelative to \( \overline{B} \)→ D(∗)ℓ − \( \overline{v} \)ℓdecays with hadronic tagging at Belle, Phys. Rev.D 92 (2015) 072014 [arXiv:1507.03233] [INSPIRE].
Belle collaboration, Measurement of the branching ratio of \( \overline{B} \)0→ D∗+ τ − \( \overline{v} \)τrelative to \( \overline{B} \)0→ D∗+ ℓ− \( \overline{v} \)ℓdecays with a semileptonic tagging method, Phys. Rev.D 94 (2016) 072007 [arXiv:1607.07923] [INSPIRE].
Belle collaboration, Measurement of the τ lepton polarization and R(D∗ ) in the decay \( \overline{B} \)→ D∗τ− \( \overline{v} \)τ, Phys. Rev. Lett.118 (2017) 211801 [arXiv:1612.00529] [INSPIRE].
LHCb collaboration, Measurement of the ratio of branching fractions \( \mathcal{B} \)(\( \overline{B} \)0→ D∗+ τ − \( \overline{v} \)τ)/ \( \mathcal{B} \)(\( \overline{B} \)0→ D∗+ μ− \( \overline{v} \)μ), Phys. Rev. Lett.115 (2015) 111803 [Erratum ibid.115 (2015) 159901] [arXiv:1506.08614] [INSPIRE].
LHCb collaboration, Measurement of the ratio of the B0→ D∗−τ+ντand B0→ D∗−μ+νμbranching fractions using three-prong τ -lepton decays, Phys. Rev. Lett.120 (2018) 171802 [arXiv:1708.08856] [INSPIRE].
Belle collaboration, Measurement of \( \mathcal{R} \)(D) and \( \mathcal{R} \)(D∗) with a semileptonic tagging method, arXiv:1904.08794 [INSPIRE].
M. Tanaka, Charged Higgs effects on exclusive semitauonic B decays, Z. Phys.C 67 (1995) 321 [hep-ph/9411405] [INSPIRE].
S. Davidson, D.C. Bailey and B.A. Campbell, Model independent constraints on leptoquarks from rare processes, Z. Phys.C 61 (1994) 613 [hep-ph/9309310] [INSPIRE].
W. Buchmüller, R. Ruckl and D. Wyler, Leptoquarks in Lepton-Quark Collisions, Phys. Lett.B 191 (1987) 442 [Erratum ibid.B 448 (1999) 320] [INSPIRE].
Z. Ligeti, M. Papucci and D.J. Robinson, New Physics in the Visible Final States of B → D(∗)τν, JHEP01 (2017) 083 [arXiv:1610.02045] [INSPIRE].
M. Tanaka and R. Watanabe, New physics in the weak interaction of \( \overline{B} \)→ D(∗) τ\( \overline{v} \), Phys. Rev.D 87 (2013) 034028 [arXiv:1212.1878] [INSPIRE].
D. Bečirević, M. Fedele, I. Nišanďžić and A. Tayduganov, Lepton Flavor Universality tests through angular observables of \( \overline{B} \)→ D(∗)ℓ\( \overline{v} \)decay modes, arXiv:1907.02257 [INSPIRE].
M. Duraisamy and A. Datta, The Full B → D∗τ− \( \overline{v} \)τAngular Distribution and CP-violating Triple Products, JHEP09 (2013) 059 [arXiv:1302.7031] [INSPIRE].
D. Hill, M. John, W. Ke and A. Poluektov, Model-independent method for measuring the angular coefficients of B0→ D∗−τ+ντdecays, JHEP11 (2019) 133 [arXiv:1908.04643] [INSPIRE].
A. Ray, S. Sahoo and R. Mohanta, Model independent analysis of B∗→ Pℓ\( \overline{v} \)ℓprocesses, Eur. Phys. J.C 79 (2019) 670 [arXiv:1907.13586] [INSPIRE].
A.K. Alok, D. Kumar, S. Kumbhakar and S. Uma Sankar, Resolution of RD/RD∗puzzle, Phys. Lett.B 784 (2018) 16 [arXiv:1804.08078] [INSPIRE].
C. Murgui, A. Peñuelas, M. Jung and A. Pich, Global fit to b → cτν transitions, JHEP09 (2019) 103 [arXiv:1904.09311] [INSPIRE].
A.K. Alok, D. Kumar, J. Kumar, S. Kumbhakar and S.U. Sankar, New physics solutions for RD and RD∗, JHEP09 (2018) 152 [arXiv:1710.04127] [INSPIRE].
A.K. Alok, D. Kumar, S. Kumbhakar and S. Uma Sankar, New Physics solutions for b → cτ \( \overline{v} \)anomalies before and after Moriond 2019, arXiv:1903.10486 [INSPIRE].
M. Jung and D.M. Straub, Constraining new physics in b → cℓν transitions, JHEP01 (2019) 009 [arXiv:1801.01112] [INSPIRE].
F.U. Bernlochner, Z. Ligeti, D.J. Robinson and W.L. Sutcliffe, New predictions for Λb→ Λcsemileptonic decays and tests of heavy quark symmetry, Phys. Rev. Lett.121 (2018) 202001 [arXiv:1808.09464] [INSPIRE].
W. Detmold, C. Lehner and S. Meinel, \( {\varLambda}_b\to p{\ell}^{-}{\overline{\nu}}_{\ell } \)and \( {\varLambda}_b\to {\varLambda}_c{\ell}^{-}{\overline{\nu}}_{\ell } \) form factors from lattice QCD with relativistic heavy quarks, Phys. Rev.D 92 (2015) 034503 [arXiv:1503.01421] [INSPIRE].
F.U. Bernlochner, Z. Ligeti, D.J. Robinson and W.L. Sutcliffe, Precise predictions for Λb→ Λcsemileptonic decays, Phys. Rev.D 99 (2019) 055008 [arXiv:1812.07593] [INSPIRE].
LHCb collaboration, Measurement of the shape of the \( {\varLambda}_b^0\to {\varLambda}_c^{+}{\mu}^{-}{\overline{v}}_{\mu } \)differential decay rate, Phys. Rev.D 96 (2017) 112005 [arXiv:1709.01920] [INSPIRE].
A. Ray, S. Sahoo and R. Mohanta, Probing new physics in semileptonic Λbdecays, Phys. Rev.D 99 (2019) 015015 [arXiv:1812.08314] [INSPIRE].
X.-Q. Li, Y.-D. Yang and X. Zhang, \( {\varLambda}_b\to {\varLambda}_c\tau {\overline{\nu}}_{\tau } \)decay in scalar and vector leptoquark scenarios, JHEP02 (2017) 068 [arXiv:1611.01635] [INSPIRE].
E. Di Salvo, F. Fontanelli and Z.J. Ajaltouni, Detailed Study of the Decay \( {\varLambda}_b\to {\varLambda}_c\tau {\overline{\nu}}_{\tau } \), Int. J. Mod. Phys.A 33 (2018) 1850169 [arXiv:1804.05592] [INSPIRE].
A. Datta, S. Kamali, S. Meinel and A. Rashed, Phenomenology of \( {\varLambda}_b\to {\varLambda}_c\tau {\overline{\nu}}_{\tau } \)using lattice QCD calculations, JHEP08 (2017) 131 [arXiv:1702.02243] [INSPIRE].
R. Dutta, Λb→ (Λc, p) τ ν decays within standard model and beyond, Phys. Rev.D 93 (2016) 054003 [arXiv:1512.04034] [INSPIRE].
S. Shivashankara, W. Wu and A. Datta, \( {\varLambda}_b\to {\varLambda}_c\tau {\overline{\nu}}_{\tau } \)Decay in the Standard Model and with New Physics, Phys. Rev.D 91 (2015) 115003 [arXiv:1502.07230] [INSPIRE].
P. Böer, A. Kokulu, J.-N. Toelstede and D. van Dyk, Angular Analysis ofΛb→Λc(→Λπ) \( \ell \overline{v} \), arXiv:1907.12554 [INSPIRE].
N. Penalva, E. Hernández and J. Nieves, Further tests of lepton flavour universality from the charged lepton energy distribution in b → c semileptonic decays: The case of \( {\varLambda}_b\to {\varLambda}_c\ell {\overline{\nu}}_{\ell } \), arXiv:1908.02328 [INSPIRE].
LHCb collaboration, Angular analysis of the B0→ K∗0e+e−decay in the low-q2region, JHEP04 (2015) 064 [arXiv:1501.03038] [INSPIRE].
ATLAS collaboration, Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay \( {\varLambda}_b^0 \)→ J/𝜓 + Λ0 with the ATLAS detector, Phys. Rev. D 89 (2014) 092009 [arXiv:1404.1071] [INSPIRE].
LHCb collaboration, Differential branching fraction and angular analysis of \( {\varLambda}_b^0 \)→ Λμ+μ−decays, JHEP06 (2015) 115 [Erratum ibid.09 (2018) 145] [arXiv:1503.07138] [INSPIRE].
CMS collaboration, Measurement of the Λbpolarization and angular parameters in Λb→ J/𝜓 Λ decays from pp collisions at \( \sqrt{s} \) = 7 and 8 TeV, Phys. Rev. D 97 (2018) 072010 [arXiv:1802.04867] [INSPIRE].
BESIII collaboration, Measurements of Weak Decay Asymmetries of \( {\varLambda}_c^{+} \)→ \( p{K}_{\mathrm{S}}^0 \), Λπ+, Σ+π0and Σ0π+, Phys. Rev.D 100 (2019) 072004 [arXiv:1905.04707] [INSPIRE].
S. Fajfer, J.F. Kamenik, I. Nisandzic and J. Zupan, Implications of Lepton Flavor Universality Violations in B Decays, Phys. Rev. Lett.109 (2012) 161801 [arXiv:1206.1872] [INSPIRE].
X.-G. He and G. Valencia, B decays with τ leptons in nonuniversal left-right models, Phys. Rev.D 87 (2013) 014014 [arXiv:1211.0348] [INSPIRE].
T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 Physics and Manual, JHEP05 (2006) 026 [hep-ph/0603175] [INSPIRE].
T. Sjöstrand, S. Mrenna and P.Z. Skands, A Brief Introduction to PYTHIA 8.1, Comput. Phys. Commun.178 (2008) 852 [arXiv:0710.3820] [INSPIRE].
LHCb collaboration, LHCb VELO (VErtex LOcator): Technical Design Report, CERN-LHCC-2001-011 (2001).
LHCb collaboration, Measurement of b-hadron fractions in 13 TeV pp collisions, Phys. Rev.D 100 (2019) 031102 [arXiv:1902.06794] [INSPIRE].
H.E. Haber, Spin formalism and applications to new physics searches, in Spin structure in high-energy processes: Proceedings, 21st SLAC Summer Institute on Particle Physics, 26 July–6 August 1993, Stanford, CA, pp. 231–272 (1994) [hep-ph/9405376] [INSPIRE].
P.R. Auvil and J.J. Brehm, Wave Functions for Particles of Higher Spin, Phys. Rev.145 (1966) 1152 [INSPIRE].
T. Feldmann and M.W.Y. Yip, Form Factors for Λb→ Λ Transitions in SCET, Phys. Rev.D 85 (2012) 014035 [Erratum ibid.D 86 (2012) 079901][arXiv:1111.1844] [INSPIRE].
A. Kadeer, J.G. Korner and U. Moosbrugger, Helicity analysis of semileptonic hyperon decays including lepton mass effects, Eur. Phys. J.C 59 (2009) 27 [hep-ph/0511019][INSPIRE].
T. Bhattacharya et al., Probing Novel Scalar and Tensor Interactions from (Ultra)Cold Neutrons to the LHC, Phys. Rev.D 85 (2012) 054512 [arXiv:1110.6448] [INSPIRE].
Open Access
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited
Author information
Authors and Affiliations
Corresponding author
Additional information
ArXiv ePrint: 1909.04608
Rights and permissions
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.
The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/.
About this article
Cite this article
Ferrillo, M., Mathad, A., Owen, P. et al. Probing effects of new physics in \( {\varLambda}_b^0\to {\varLambda}_c^{+}{\mu}^{-}{\overline{v}}_{\mu } \) decays. J. High Energ. Phys. 2019, 148 (2019). https://doi.org/10.1007/JHEP12(2019)148
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP12(2019)148