Publications de Guido Haefeli | EPFL Graph Search

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Dark matter is a well-established theoretical addition to the Standard Model supported by many observations in modern astrophysics and cosmology. In this context, the existence of weakly interacting massive particles represents an appealing solution to the ...

The decays B+-> J/psi 3 pi(+)2 pi(-) and B+ -> psi(2S)pi(+)pi(+)pi(-) are observed for the first time using a data sample corresponding to an integrated luminosity of 3.0 fb(-1), collected by the LHCb experiment in proton- proton collisions at the centre-o ...

The performance of the LHCb Muon system and its stability across the full 2010 data taking with LHC running at root s = 7 TeV energy is studied. The optimization of the detector setting and the time calibration performed with the first collisions delivered ...

The first measurement that relates semileptonic and hadronic decay rates of the B-c(+) meson is performed using proton-proton collision data corresponding to 1.0 fb(-1) of integrated luminosity collected with the LHCb detector. The measured value of the ra ...

The prompt production of charmonium chi(c) and J/psi states is studied in proton-proton collisions at a centre-of-mass energy of root s = 7 TeV at the Large Hadron Collider. The chi(c) and J/psi mesons are identified through their decays chi(c) -> J/psi ga ...

A study of prompt charm-hadron pair production in proton-lead collisions at root s(NN) = 8.16 TeV is performed using data corresponding to an integrated luminosity of about 30 nb(-1), collected with the LHCb experiment. Production cross sections for differ ...

A search for the decays B-s(0) -> mu(+)mu(-) and B-0 -> mu(+)mu(-) is performed with 0.37 fb(-1) of pp collisions at root s = 7 TeV collected by the LHCb experiment in 2011. The upper limits on the branching fractions are B(B-s(0) -> mu(+)mu(-)) < 1.6 x 10 ...

A measurement of the lifetimes of the Omega(0)(c) and Xi(0)(c) baryons is reported using proton-proton collision data at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb(-1) collected by the LHCb experiment. The Omega( ...

The differential branching fraction of the decay Lambda(0)(b) -> Lambda mu(+) mu(-) is measured as a function of the square of the dimuon invariant mass, q(2). A yield of 78 +/- 12 Lambda(0)(b) -> Lambda mu(+) mu(-) decays is observed using data, correspon ...

A measurement of the branching fraction of the decay B-s(0) -> (KSKS0)-K-0 is performed using proton- proton - collision data corresponding to an integrated luminosity of 5 fb(-1) collected by the LHCb experiment between 2011 and 2016. The branching fracti ...

The prompt production of the charmonium chi(c1) and chi(c2) mesons has been studied in proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of root s = 7 TeV. The chi(c) mesons are identified through their decays chi(c) -> J/psi ...

First observations of the decays A(b)(0) -> A(c)(+)D((s))(-) are reported using data corresponding to an integrated luminosity of 3 fb(-1) collected at 7 and 8 TeV center-of- ass energies in proton-proton collisions with the LHCb detector. In addition, the ...

The B+ -> D+K+pi(-) decay is observed in a data sample corresponding to 3.0 fb(-1) of pp collision data recorded by the LHCb experiment during 2011 and 2012. The signal significance is 8 sigma and the branching fraction is measured to be B(B+ -> D+K+pi(-)) ...

The production of B-+/- mesons in proton-proton collisions at root s = 7 TeV is studied using 35 pb(-1) of data collected by the LHCb detector. The B-+/- mesons are reconstructed exclusively in the B-+/- -> J/(sic)K-+/- mode, with J/(sic) -> mu(+)mu(-). Th ...

Violations of CPT symmetry and Lorentz invariance are searched for by studying interference effects in B-0 mixing and in B-s(0) mixing. Samples of B-0 -> J/psi K-S(0) and B-0(s) -> J/psi K+K- decays are recorded by the LHCb detector in proton-proton collis ...

Based on data corresponding to an integrated luminosity of 0.37 fb(-1) collected by the LHCb experiment in 2011, the following ratios of branching fractions are measured: B(B-0 ->pi(+)pi(-))/B(B-0 -> K+pi(-))=0.262 +/- 0.009 +/- 0.017, (f(s)/f(d)).B(B-s(0) ...

The first observations of B-0 -> (D) over bar*(2007)K-0(+)pi(-) and B-s(0) -> (D) over bar*(2007)K-0(-)pi(+) decays are presented, and their branching fractions relative to that of the B ->( D) over bar* (2007)(0)pi(+)pi(-) decay are reported. These modes ...

Bottom baryons decaying to a J/psi meson and a hyperon are reconstructed using 1.0 fb(-1) of data collected in 2011 with the LHCb detector. Significant Lambda(0)(b) -> J/psi Lambda, Xi(-)(b) -> J/psi Xi(-) and Omega(-)(b) -> J/psi Omega(-) signals are obse ...

A model-independent search for direct CP violation in the Cabibbo-suppressed decay D+ -> K- K+ pi(+) in a sample of approximately 370 000 decays is carried out. The data were collected by the LHCb experiment in 2010 and correspond to an integrated luminosi ...

Guido Haefeli

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Sensitivity of the SHiP experiment to light dark matter

Observation of B+ -> J/psi 3 pi(+)2 pi(-) and B+ -> psi (2S)pi(+)pi(+)pi(-) decays

Performance of the LHCb muon system

Measurement of the ratio of B-c(+) branching fractions to J/psi pi(+) and J/psi mu(+)nu(mu) final states

Measurement of the ratio of prompt chi(c) to J/psi production in pp collisions at root s=7 TeV

Observation of Enhanced Double Parton Scattering in Proton-Lead Collisions at root s(NN)=8.16 TeV

Erratum to: Search for CP violation in the phase space of D0 → π - π+π0 decays with the energy test

Search for the rare decays B-s(0) -> mu(+)mu(-) and B-0 -> mu(+)mu(-)

Measurement of the lifetimes of promptly produced Omega(0)(c) and Xi(9)(c) baryons

Measurement of the differential branching fraction of the decay Lambda(0)(b) -> Lambda mu(+) mu(-)

Measurement of the branching fraction of the decay B-s(0) -> (KSKS0)-K-0

Measurement of the cross-section ratio sigma(chi(c2))/sigma(chi(c1)) for prompt chi(c) production at root s=7 TeV LHCb Collaboration

Study of Beauty Hadron Decays into Pairs of Charm Hadrons

First observation of the rare B+ -> D+K+pi(-) decay

Measurement of the B-+/- production cross-section in pp collisions at root s=7 TeV

Search for Violations of Lorentz Invariance and CPT Symmetry in B-(s)(0) Mixing

Measurement of b-hadron branching fractions for two-body decays into charmless charged hadrons

Observation of the B-0 -> (D)over-barK-0(+) pi(-) and B-s(0) -> (D)over-barK-0(-)pi(+) decays

Measurement of the Lambda(0)(b), Xi(-)(b), and Omega(-)(b) Baryon Masses

Search for CP violation in D+ -> K- K+ pi(+) decays