Hamburg 2016 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 54: Seltene Zerfälle und BSM im Flavourbereich
T 54.8: Vortrag
Dienstag, 1. März 2016, 18:35–18:50, VMP8 SR 05
Search for heavy Majorana neutrinos in rare semileptonic B meson decays at the LHCb experiment — •Meriem Boubdir, Arno Heister, and Stefan Schael — I. Physikalisches Institut B, RWTH Aachen
The Standard Model (SM) has been so far the most successful approach to explain the phenomena of particles physics both at low and high energies. Neutrino flavor oscillation experiments imply that neutrinos are massive particle (mν ≥ 0). Moreover, the SM can’t answer some cosmology open questions e.g. the Dark Matter origin or the matter over anti-matter dominance in the universe. Extending SM minimally by adding a Majorana mass term and three singlet neutrinos may solve these problems. In terms of mass eigenstates one obtains in the νMSM the known three light neutrinos νi and three heavy, quasi-sterile neutrinos Nj. Because of the small admixture of the left-handed component, the heavy neutrinos couple to the W±, Z bosons and also to the Higgs boson. As a result, lepton-number (B∓ → M± l1∓ l2∓ ) and lepton-flavour (B∓ → M∓ l1∓ l2± , l1 ≠ l2) violating semileptonic decays of B mesons may be induced. The heavy neutrino can be produced as an on-shell intermediate particle (mM ≲ mN ≲ mB).
The LHCb experiment at LHC is one of the most promising current experiments investigating in particular rare B meson decays within SM and beyond it. A summary of recent LHCb results as well as studies leading to a new search for heavy Majorana neutrinos in LNV and LFV B meson rare decays using LHCb run II data @ 13 TeV will be presented.