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Jean Wicht

Cette personne n’est plus à l’EPFL

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Publications associées (386)

Measurement of Υ(5S) decays to B^{0} and B^{+} mesons

Jean Wicht, Remi Léandre Albert Louvot, Olivier Schneider, Tagir Aushev, Mingkui Wang, Vladislav Balagura, Jing Li

Decays of the Gamma(5S) resonance to channels with B+ and B-0 mesons are studied using a 23.6 fb(-1) data sample collected with the Belle detector at the KEKB asymmetric-energy e(+) e(-) collider. Fully reconstructed B+ -> J/psi K+, B-0 -> J/psi K-*0, B+ - ...

American Physical Society2010

Evidence for B→Kη′γ decays at Belle

Jean Wicht, Aurelio Bay, Remi Léandre Albert Louvot, Olivier Schneider, Mingkui Wang, Chao Wang, Vladislav Balagura, Ji Hyun Kim, Jing Li

We present the results of a search for the radiative decay B -> K eta 'gamma and find evidence for B+ -> K+eta 'gamma decays at the 3.3 standard deviation level with a partial branching fraction of (3.6 +/- 1.2 +/- 0.4) x 10(-6), where the first error is s ...

American Physical Society2010

Observation of Bs0 -> Ds()+ Ds()- using e+e- collisions and a determination of the Bs-Bsbar width difference Delta Gamma_s

Jean Wicht, Aurelio Bay, Remi Léandre Albert Louvot, Olivier Schneider, Tagir Aushev, Mingkui Wang, Chao Wang, Vladislav Balagura, Ji Hyun Kim

We have made the first observation of B-s(0) -> D-s(()()+) D-s(()()-) decays using 23.6 fb(-1) of data recorded by the Belle experiment running on the Y(5S) resonance. The branching fractions are measured to be B(B-s(0) -> Ds+Ds-) = (1.03(-0.32-0.25)(+0. ...

2010

Observation of Bs0→Ds-π+ and Bs0→Ds() -ρ+ and measurement of the Bs0→Ds*-ρ+ longitudinal polarization fraction

Jean Wicht, Aurelio Bay, Remi Léandre Albert Louvot, Olivier Schneider, Tagir Aushev, Mingkui Wang, Chao Wang, Vladislav Balagura, Ji Hyun Kim, Jing Li

First observations of the Bs0→Ds*-π+, Bs0→Ds-ρ+ and Bs0→Ds*-ρ+ decays are reported together with measurements of their branching fractions: B(Bs0→Ds*-π+)=[2.4-0.4+0.5(stat)±0.3(syst) ±0.4(fs)]×10-3, B(Bs0→Ds-ρ+)=[8.5-1. 2+1.3(stat)±1.1(syst)±1.3(fs)]×10-3 ...

2010

Measurement of the Differential Branching Fraction and Forward-Backward Asymmetry for B→K(*)l+l-

Jean Wicht, Remi Léandre Albert Louvot, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Mingkui Wang, Chao Wang, Vladislav Balagura, Xiao Wang, Jing Li

We study B -> Kd()l(+)l(-) decays (l = e,u) based on a data sample of 657 x 10(6) B (B) over bar pairs collected with the Belle detector at the KEKB e(+)e(-) collider. We report the differential branching fraction, isospin asymmetry, K polarization, and ...

2009

Evidence of time-dependent CP violation in the decay B^{0}→D^{+}D^{-}

Jean Wicht, Aurelio Bay, Remi Léandre Albert Louvot, Nicolas Zwahlen, Olivier Schneider, Tagir Aushev, Chao Wang, Vladislav Balagura, Jing Li

We report a measurement of the CP-odd fraction and the time-dependent CP violation in B-0 -> D*+D*- decays, using 657x10(6) BB events collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We measure ...

American Physical Society2009

Measurement of inclusive radiative B-meson decays with a photon energy threshold of 1.7 GeV

Jean Wicht, Aurelio Bay, Remi Léandre Albert Louvot, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Mingkui Wang, Chao Wang, Vladislav Balagura, Jing Li

Using 605fb-1 of data collected at the Υ(4S) resonance we present a measurement of the inclusive radiative B-meson decay channel, B→Xsγ. For the lower photon energy thresholds of 1.7, 1.8, 1.9, and 2.0 GeV, as defined in the rest frame of the B meson, we m ...

2009

Measurement of the decay Bs0→Ds-π+ and evidence for Bs0→Ds K± in e+e- annihilation at s 10.87GeV

Jean Wicht, Aurelio Bay, Remi Léandre Albert Louvot, Nicolas Zwahlen, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Chao Wang, Vladislav Balagura, Xiao Wang, Jing Li

We have studied Bs0→Ds-π+ and Bs0→Ds K± decays using 23.6fb-1 of data collected at the Υ(5S) resonance with the Belle detector at the KEKB e+e- collider. This highly pure Bs0→Ds-π+ sample is used to measure the branching fraction, B(Bs0→Ds-π+)=[3.67-0.33+0 ...

2009

Search for B→πℓ+ℓ- decays at Belle

Jean Wicht, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Mingkui Wang, Chao Wang, Vladislav Balagura, Ji Hyun Kim

We present a search for the decays B+→π+ℓ+ℓ- and B0→π0ℓ+ℓ-, where ℓ+ℓ- is either a μ+μ- or e+e- pair, with a data sample of 657×106 BB̄ pairs collected with the Belle detector at the KEKB e+e- collider. Signal events are reconstructed from a charged or a n ...

American Physical Society2008

Search for B+→D*+π0 decay

Jean Wicht, Aurelio Bay, Olivier Schneider, Tagir Aushev, Mingkui Wang, Chao Wang, Vladislav Balagura, Xiao Wang

We report on a search for the doubly Cabibbo suppressed decay B+→D*+π0, based on a data sample of 657×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We find no significant signal and set ...

2008

Evidence for neutral B meson decays to ωk*0

Jean Wicht, Aurelio Bay, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Mingkui Wang, Chao Wang, Xiao Wang, Jing Li

We present the results of a study of the charmless vector-vector decay B0→ωK0 with 657×106 BB̅ pairs collected with the Belle detector at the KEKB e+e- collider. We measure the branching fraction to be B(B0→ωK0)=[1.8±0.7(stat)±0.3(syst)]×10-6 with 3.0σ s ...

2008

Observation of two resonancelike structures in the π+χc1 mass distribution in exclusive B¯0→K-π+χc1 decays

Jean Wicht, Aurelio Bay, Olivier Schneider, Tagir Aushev, Mingkui Wang, Chao Wang, Vladislav Balagura, Xiao Wang

American Physical Society2008

Search for resonant B±→K±h→K±γγB±→K±h→K±γγ decays at Belle

Jean Wicht, Tagir Aushev

2008

Difference in direct charge-parity violation between charged and neutral B meson decays

Jean Wicht, Aurelio Bay, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Mingkui Wang, Stewart Cole, Chao Wang, Vladislav Balagura, Jing Li

2008

Measurement of B0→π+π-π+π- decays and search for B0→ρ0ρ0

Jean Wicht, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Mingkui Wang, Chao Wang, Xiao Wang, Jing Li

American Physical Society2008

Measurement of Branching Fractions, Isospin, and CP-Violating Asymmetries for Exclusive b→dγ Modes

Jean Wicht, Aurelio Bay, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Mingkui Wang, Chao Wang, Vladislav Balagura, Xiao Wang

2008

Observation of Anomalous Υ(1S)π+π- and Υ(2S)π+π- Production near the Υ(5S) Resonance

Jean Wicht, Aurelio Bay, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Mingkui Wang, Chao Wang, Vladislav Balagura, Xiao Wang

2008

Observation of B_{s}^{0}→φγ and Search for B_{s}^{0}→γγ Decays at Belle

Jean Wicht, Aurelio Bay, Nicolas Zwahlen, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Chao Wang, Vladislav Balagura, Xiao Wang

2008

Study of the radiative penguin B0s [to] [phi] [gamma] and B0s [to] [gamma] [gamma] decays and the resonant B+ [to] K+ [gamma] [gamma] decays at Belle

Jean Wicht

We present the study of the radiative penguin Bs0 → ϕγ and Bs0 → γγ decays and the resonant B+ → K+h → K+γγ decays. We use data samples recorded at the Υ(4S) and Υ(5S) resonances with the Belle detector at KEKB, an electron-positron collider located ...

EPFL2008

Evidence for D0-D̄0 mixing

Jean Wicht, Aurelio Bay, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Mingkui Wang, Stewart Cole, Chao Wang, Yuan Yuan, Vladislav Balagura, Lei Zhang, Jing Li

We observe evidence for D0-D̄0 mixing by measuring the difference in the apparent lifetime when a D0 meson decays to the CP eigenstates K+K- and π+π- and when it decays to the final state K-π+. We find the relative difference of the lifetimes yCP to be [1. ...

2007

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