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Search for Rare B-(s)(0) -> mu(+)mu(-)mu(+)mu(-) Decays

Résumé

A search for the decays B-s(0) -> mu(+)mu(-)mu(+)mu(-) and B-0 -> mu(+)mu(-)mu(+)mu(-) is performed using data, corresponding to an integrated luminosity of 1.0 fb(-1), collected with the LHCb detector in 2011. The number of candidates observed is consistent with the expected background and, assuming phase-space models of the decays, limits on the branching fractions are set: B(B-s(0) -> mu(+)mu(-)mu(+)mu(-)) mu(+)mu(-)mu(+)mu(-)) SP) SP)

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Concepts associés (29)

Méson B

In particle physics, B mesons are mesons composed of a bottom antiquark and either an up (_B+), down (_B0), strange (_Strange B0) or charm quark (_Charmed B+). The combination of a bottom antiquark and a top quark is not thought to be possible because of the top quark's short lifetime. The combination of a bottom antiquark and a bottom quark is not a B meson, but rather bottomonium, which is something else entirely. Each B meson has an antiparticle that is composed of a bottom quark and an up (_B-), down (_AntiB0), strange (_Strange antiB0) or charm (_Charmed b-) antiquark respectively.

Pseudoscalar meson

In high-energy physics, a pseudoscalar meson is a meson with total spin 0 and odd parity (usually notated as J^P = 0^− ). Pseudoscalar mesons are commonly seen in proton-proton scattering and proton-antiproton annihilation, and include the pion (π), kaon (K), eta (η), and eta prime () particles, whose masses are known with great precision. Among all of the mesons known to exist, in some sense, the pseudoscalars are the most well studied and understood.

LHCb

LHCb (Large Hadron Collider beauty experiment : Expérience du LHC sur le quark beauté) est une expérience de physique des particules utilisant les collisions de protons produites au collisionneur LHC du CERN (Genève). Ce détecteur est spécialisé dans la physique des saveurs et la recherche de nouvelle physique par des méthodes indirectes comme la mesure de violation de la symétrie CP ou de taux d'embranchement de décroissances rares. Le détecteur LHCb se trouve sur la commune de Ferney-Voltaire en France au point 8 du LHC, à quelques mètres de la frontière suisse.

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Publications associées (31)

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A large variety of new physics models suggest that the rates for lepton flavour violating

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-hadron decays may be much higher than predicted in the Standard Model, which leads to a high interest in the search for such decays. This thesis presents the se ...

EPFL2024

Afficher plus

Search for Rare B-(s)(0) -> mu(+)mu(-)mu(+)mu(-) Decays

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Search for the lepton flavour violating decays B0→e±μ∓ and B0s→e±μ∓ with LHCb Run 2 data

Search for new Higgs bosons via same-sign top quark pair production in association with a jet in proton-proton collisions at √s=13 TeV

Measurement of the τ lepton polarization in Z boson decays in proton-proton collisions at √s=13 TeV

Search for the lepton flavour violating decays B0→e±μ∓ and B0s→e±μ∓ with LHCb Run 2 data

Search for new Higgs bosons via same-sign top quark pair production in association with a jet in proton-proton collisions at √s=13 TeV

Measurement of the τ lepton polarization in Z boson decays in proton-proton collisions at √s=13 TeV