Search for massive long-lived particles decaying semileptonically in the LHCb detector

Abstract

A search is presented for massive long-lived particles decaying into a muon and two quarks. The dataset consists of proton-proton interactions at centre-of-mass energies of 7 and 8 TeV, corresponding to integrated luminosities of 1 and 2 1/fb, respectively. The analysis is performed assuming a set of production mechanisms with simple topologies, including the production of a Higgs-like particle decaying into two long-lived particles. The mass range from 20 to 80 GeV and lifetimes from 5 to 100 ps are explored. Results are also interpreted in terms of neutralino production in different supersymmetric models, with masses in the 23-198 GeV range. No excess above the background expectation is observed and upper limits are set on the production cross-section for various points in the parameter space of theoretical models.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-047.html

References in corpus (37)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• A Supersymmetry Primer
• LHCb Detector Performance
• The LHCb Trigger and its Performance in 2011
• The PDF4LHC Working Group Interim Recommendations
• Performance of the LHCb Vertex Locator
• Measurement of J/psi production in pp collisions at sqrt(s)=7 TeV
• Discovering the Higgs Through Highly-Displaced Vertices
• Measurement of the track reconstruction efficiency at LHCb
• Precision luminosity measurements at LHCb
• Measurement of the inclusive isolated prompt photon cross section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• The R-Parity Violating Minimal Supergravity Model
• Measurement of sigma(pp -> b anti-b X) at \sqrt(s)=7 TeV in the forward region
• Search for massive, long-lived particles using multitrack displaced vertices or displaced lepton pairs in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• Measurement of the forward $Z$ boson production cross-section in $pp$ collisions at $\sqrt{s}$ = 7 TeV
• Measurement of forward $W$ and $Z$ boson production in $pp$ collisions at $\sqrt{s}=8\mathrm{Te}\mathrm{V}$
• Search for long-lived neutral particles decaying to quark-antiquark pairs in proton-proton collisions at sqrt(s) = 8 TeV
• Inclusive $W$ and $Z$ production in the forward region at $\sqrt{s}=7$ TeV
• Search for the rare decay B_s^0->mu^+mu^-
• Displaced Supersymmetry
• Measurement of the inclusive isolated prompt photon cross-section in pp collisions at sqrt(s)= 7 TeV using 35 pb-1 of ATLAS data
• Search for pair-produced long-lived neutral particles decaying in the ATLAS hadronic calorimeter in $pp$ collisions at $\sqrt{s}$ = 8 TeV
• Measurement of the forward $W$ boson cross-section in $pp$ collisions at $\sqrt{s}=7\mathrm{TeV}$
• Search for long-lived particles decaying to jet pairs
• Search for resonant pair production of neutral long-lived particles decaying to bbbar in ppbar collisions at sqrt(s)=1.96 TeV
• Measurements of the $B^{+}$, $B^0$, $B_s^0$ meson and ${\Lambda }_b^0$ baryon lifetimes
• Search for Higgs-like bosons decaying into long-lived exotic particles
• Supersymmetric Crevices: Missing Signatures of RPV at the LHC
• Search for heavy metastable particles decaying to jet pairs in pp collisions at sqrt{s} = 1.96 TeV
• Search for the rare decay KS -> mu+ mu-

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• Long-lived Sterile Neutrinos at Belle II in Effective Field Theory
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• Long-lived heavy neutral leptons at the LHC: four-fermion single-$N_R$ operators
• HECATE: A long lived particle detector concept for the FCC-ee or CEPC
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• Long-Lived Light Mediators from Higgs boson Decay at HL-LHC, FCC-hh and a Proposal of Dedicated LLP Detectors for FCC-hh
• Determining the lifetime of long-lived particles at the HL-LHC
• Testing the seesaw mechanisms via displaced right-handed neutrinos from a light scalar at the HL-LHC
• Novel signatures for long-lived particles at the LHC
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• New Physics Search at the CEPC: a General Perspective
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• Reconstructing particle masses in events with displaced vertices
• Exploring the lifetime and cosmic frontier with the MATHUSLA detector
• Exotic Higgs decays into displaced jets at the LHeC
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• Brazilian Community Report on Dark Matter
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• Long-lived Light Mediators in a Higgs Portal Model at the FCC-ee
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• CP violation in $B_s$ decays mediated by two nearly-degenerate Majorana neutrinos