Publications de Guido Haefeli | EPFL Graph Search

Erratum to: Comprehensive analysis of local and nonlocal amplitudes in the B0 → K*0μ+μ− decay

Lesya Shchutska, Olivier Schneider, Aurelio Bay, Guido Haefeli, Frédéric Blanc, Tatsuya Nakada, Elena Graverini, Aravindhan Venkateswaran, Luis Miguel Garcia Martin, Vitalii Lisovskyi

Due to a small manual rounding error, an incorrect central value was quoted in table 4 for the C 9τ parameter. The correct result is given by C 9τ = (−1.2 ± 2.6 ± 1.0) × 10 2 , (1) instead of (−1.0±2.6±1.0)×10 2 , corresponding to a difference of −0.2×10 2 ...

Springer Science and Business Media LLC2025

Three-pion Bose-Einstein correlations measured in proton-proton collisions

Lesya Shchutska, Olivier Schneider, Aurelio Bay, Guido Haefeli, Frédéric Blanc, Tatsuya Nakada, Elena Graverini, Aravindhan Venkateswaran, Luis Miguel Garcia Martin, Yong Ding

A study on the Bose-Einstein correlations for triplets of same-sign pions is presented. The analysis is performed using proton-proton collisions at a centre-of-mass energy of

\sqrt{s}

= 7 TeV, recorded by the LHCb experiment, corresponding to an integr ...

Springer Science and Business Media LLC2025

Search for Resonance-enhanced Cp and Angular Asymmetries in the Λc+ → Pμ+ Μ- Decay at Lhcb

Lesya Shchutska, Olivier Schneider, Aurelio Bay, Guido Haefeli, Frédéric Blanc, Tatsuya Nakada, Elena Graverini, Aravindhan Venkateswaran, Vitalii Lisovskyi, Ettore Zaffaroni

The first measurement of the CP asymmetry of the decay rate (A(CP)) and the CP average (Sigma A(FB)) and CP asymmetry (Delta A(FB)) of the forward-backward asymmetry in the muon system of Lambda(+)(c) -> p mu(+) mu(-) decays is reported. The measurement is ...

AMER PHYSICAL SOC2025

Branching fraction measurement of the decay B+→ψ(2S)ϕ(1020)K+

Lesya Shchutska, Olivier Schneider, Aurelio Bay, Guido Haefeli, Frédéric Blanc, Tatsuya Nakada, Elena Graverini, Aravindhan Venkateswaran, Luis Miguel Garcia Martin, Vitalii Lisovskyi

The branching fraction of the decay B + → ψ ( 2 S ) ϕ ( 1020 ) K + , relative to the topologically similar decay B + → J / ψ ϕ ( 1020 ) K + , is measured using proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8 ...

American Physical Society (APS)2025

Study of light-meson resonances decaying to K S0 Kπ in the B → (K S0 Kπ)K channels

Lesya Shchutska, Olivier Schneider, Aurelio Bay, Guido Haefeli, Frédéric Blanc, Tatsuya Nakada, Elena Graverini, Aravindhan Venkateswaran, Luis Miguel Garcia Martin, Vitalii Lisovskyi

A study is presented of B+→KS0K-π+K+ and B+→KS0K+π-K+ decays based on the analysis of proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb-1. The KS0K ...

2025

Measurement of CP violation in B0→ D+D− and Bs0→Ds+Ds− decays

Lesya Shchutska, Olivier Schneider, Aurelio Bay, Guido Haefeli, Frédéric Blanc, Tatsuya Nakada, Elena Graverini, Aravindhan Venkateswaran, Luis Miguel Garcia Martin, Vitalii Lisovskyi

A time-dependent, flavour-tagged measurement of CP violation is performed with B0→ D+D− and Bs0→Ds+Ds− decays, using data collected by the LHCb detector in proton-proton collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminos ...

2025

Microlens-enhanced SiPMs

Lesya Shchutska, Olivier Schneider, Guido Haefeli, Frédéric Blanc, Ettore Zaffaroni, Radoslav Marchevski, Carina Trippl

A novel concept to enhance the photo-detection efficiency (PDE) of silicon photomultipliers (SiPMs) has been applied and remarkable positive results can be reported. This concept uses arrays of microlenses to cover every second SiPM pixel in a chequerboard ...

2025

Evidence for B^{-}→D^{**0}τ^{-}ν_{τ}[over ¯] Decays

Lesya Shchutska, Olivier Schneider, Aurelio Bay, Guido Haefeli, Frédéric Blanc, Tatsuya Nakada, Elena Graverini, Aravindhan Venkateswaran, Luis Miguel Garcia Martin, Vitalii Lisovskyi

The first evidence for the decay B^{-}→D^{**0}τ^{-}ν[over ¯]_{τ} is obtained using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb^{-1}, at centre-of-mass energies of 7, 8, and 13 TeV. Here, ...

2025

Observation of Exotic J/ψφ Resonant Structure in Diffractive Processes in Proton-Proton Collisions

Lesya Shchutska, Olivier Schneider, Aurelio Bay, Guido Haefeli, Frédéric Blanc, Tatsuya Nakada, Elena Graverini, Renato Quagliani, Aravindhan Venkateswaran, Luis Miguel Garcia Martin

The first study of J/ψφ production in diffractive processes in proton-proton collisions is presented. The study is based on an LHCb dataset recorded at center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5 fb-1. The data disfavor ...

2025

Measurement of exclusive J/ψ and ψ(2S) production at ps = 13 TeV

Lesya Shchutska, Olivier Schneider, Aurelio Bay, Guido Haefeli, Frédéric Blanc, Tatsuya Nakada, Elena Graverini, Aravindhan Venkateswaran, Luis Miguel Garcia Martin, Vitalii Lisovskyi

Measurements are presented of the cross-section for the central exclusive production of J/ψ → µ+µ− and ψ(2S) → µ+µ− processes in proton-proton collisions at ps = 13 TeV with 2016–2018 data. They are performed by requiring both muons to be in the LHCb accep ...

2025