Exploring GeV-scale Majorana neutrinos in lepton-number-violating Λb0 baryon decays

Exploring GeV-scale Majorana neutrinos in lepton-number-violating Λb0 baryon decays In this work, the lepton-number-violating processes in |ΔL|=2 decays of Λb0 baryon, Λb0→pπ+μ-μ- and Λb0→Λc+π+μ-μ-, are investigated for the first time, via an intermediate on-shell Majorana neutrino N with a mass in the GeV scale. We explore the experimental sensitivity of these dimuon channels at the LHCb and CMS experiments, in which heavy neutrino lifetimes in the accessible ranges of τN=[1,100,1000]  ps are considered. For a integrated luminosity collected of 10 and 50  fb−1 at the LHCb and 30, 300, and 3000  fb−1 at the CMS, we found significant sensitivity on branching fractions of the order BR(Λb0→pπ+μ-μ-)≲O(10-9–10-8) and BR(Λb0→Λc+π+μ-μ-)≲O(10-8–10-7). Exclusion regions on the parameter space (mN, |VμN|2) associated with the heavy neutrino are presented and compared with those from K-→π+μ-μ- (NA48/2) and B-→π+μ-μ- (LHCb) as well as by different search strategies such as NA3, CHARMII, NuTeV, Belle, and DELPHI. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Exploring GeV-scale Majorana neutrinos in lepton-number-violating Λb0 baryon decays

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Exploring GeV-scale Majorana neutrinos in lepton-number-violating Λb0 baryon decays

Abstract

In this work, the lepton-number-violating processes in |ΔL|=2 decays of Λb0 baryon, Λb0→pπ+μ-μ- and Λb0→Λc+π+μ-μ-, are investigated for the first time, via an intermediate on-shell Majorana neutrino N with a mass in the GeV scale. We explore the experimental sensitivity of these dimuon channels at the LHCb and CMS experiments, in which heavy neutrino lifetimes in the accessible ranges of τN=[1,100,1000]  ps are considered. For a integrated luminosity collected of 10 and 50  fb−1 at the LHCb and 30, 300, and 3000  fb−1 at the CMS, we found significant sensitivity on branching fractions of the order BR(Λb0→pπ+μ-μ-)≲O(10-9–10-8) and BR(Λb0→Λc+π+μ-μ-)≲O(10-8–10-7). Exclusion regions on the parameter space (mN, |VμN|2) associated with the heavy neutrino are presented and compared with those from K-→π+μ-μ- (NA48/2) and B-→π+μ-μ- (LHCb) as well as by different search strategies such as NA3, CHARMII, NuTeV, Belle, and DELPHI.
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Publisher
American Physical Society (APS)
Copyright
Copyright © © 2017 American Physical Society
ISSN
1550-7998
eISSN
1550-2368
D.O.I.
10.1103/PhysRevD.96.015039
Publisher site
See Article on Publisher Site

Abstract

In this work, the lepton-number-violating processes in |ΔL|=2 decays of Λb0 baryon, Λb0→pπ+μ-μ- and Λb0→Λc+π+μ-μ-, are investigated for the first time, via an intermediate on-shell Majorana neutrino N with a mass in the GeV scale. We explore the experimental sensitivity of these dimuon channels at the LHCb and CMS experiments, in which heavy neutrino lifetimes in the accessible ranges of τN=[1,100,1000]  ps are considered. For a integrated luminosity collected of 10 and 50  fb−1 at the LHCb and 30, 300, and 3000  fb−1 at the CMS, we found significant sensitivity on branching fractions of the order BR(Λb0→pπ+μ-μ-)≲O(10-9–10-8) and BR(Λb0→Λc+π+μ-μ-)≲O(10-8–10-7). Exclusion regions on the parameter space (mN, |VμN|2) associated with the heavy neutrino are presented and compared with those from K-→π+μ-μ- (NA48/2) and B-→π+μ-μ- (LHCb) as well as by different search strategies such as NA3, CHARMII, NuTeV, Belle, and DELPHI.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Jul 1, 2017

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