Xuan Li

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Publications associées (55)

Observation of a Narrow Pentaquark State, P-c(4312)(+), and of the Two-Peak Structure of the P-c(4450)(+)

Olivier Schneider, Aurelio Bay, Yiming Li, Guido Haefeli, Christoph Frei, Frédéric Blanc, Tatsuya Nakada, Michel De Cian, Elena Graverini, Matthieu Philippe Luther Marinangeli

A narrow pentaquark state, P-c(4312)(+), decaying to J/psi p, is discovered with a statistical significance of 7.3 sigma in a data sample of Lambda(0)(b) -> J/psi pK(-) decays, which is an order of magnitude larger than that previously analyzed by the LHCb ...

2019

Measurement of CP-Violating and Mixing-Induced Observables in B-s(0) -> phi gamma Decays

Olivier Schneider, Aurelio Bay, Yiming Li, Guido Haefeli, Frédéric Blanc, Christoph Frei, Tatsuya Nakada, François Fleuret, Jorge Miguel Dias Almeida Rodrigues Soares, Michel De Cian

A time-dependent analysis of the B-s(0) -> phi gamma decay rate is performed to determine the CP -violating observables S-phi gamma and C-phi gamma and the mixing-induced observable A(phi gamma)(Delta). The measurement is based on a sample of pp collision ...

2019

Measurement of the electron reconstruction efficiency at LHCb

Olivier Schneider, Yiming Li, Guido Haefeli, Frédéric Blanc, Aurelio Bay, Tatsuya Nakada, Michel De Cian, Christoph Frei, Luca Pescatore, Elena Graverini

The single electron track-reconstruction efficiency is calibrated using a sample corresponding to 1.3 fb(-1) of pp collision data recorded with the LHCb detector in 2017. This measurement exploits B+ -> J/psi (e(+)e(-))K+ decays, where one of the electrons ...

2019

Observation of New Resonances in the Lambda(0)(b)pi(+)pi(-) System

Olivier Schneider, Aurelio Bay, Yiming Li, Guido Haefeli, Frédéric Blanc, Christoph Frei, Tatsuya Nakada, Michel De Cian, Luca Pescatore, Chitsanu Khurewathanakul

We report the observation of a new structure in the Lambda(0)(b)pi(+)pi(- )spectrum using the full LHCb data set of pp collisions, corresponding to an integrated luminosity of 9 fb(-1), collected at root s = 7, 8, and 13 TeV. A study of the structure sugge ...

2019

Amplitude analysis of the B0 (s)! K0K0 decays and measurement of the branching fraction of the B0! K0K0 decay

Olivier Schneider, Aurelio Bay, Yiming Li, Guido Haefeli, Frédéric Blanc, Christoph Frei, Tatsuya Nakada, Michel De Cian, Luca Pescatore, Chitsanu Khurewathanakul

The B0 K0K0 and B0 s K0K0 decays are studied using proton-proton collision data corresponding to an integrated luminosity of 3 fb. An untagged and timeintegrated amplitude analysis of B0 (s) (K+)(K) decays in two-body invariant mass regions of 150MeV/c2 ar ...

Springer Nature2019

Measurement of CP violation in the B-s(0)-> phi phi decay and search for the B-0 -> phi phi decay

Olivier Schneider, Yiming Li, Aurelio Bay, Guido Haefeli, Frédéric Blanc, Christoph Frei, Tatsuya Nakada, Michel De Cian, Luca Pescatore, Chitsanu Khurewathanakul

A measurement of the time-dependent CP-violating asymmetry in Bs0 ->phi phi = 7 TeV in 2011, 8 TeV in 2012 and 13 TeV in 2015 and 2016, a signal yield of around 9000 Bs0 ->phi phi decays is obtained. The CP-violating phase phi sss over bar is measured to b ...

Springer Nature2019

Study of chi(cJ) decaying into phi K*(892)(K)over-bar

Qian Wang, Xin Chen, Jiannong Fang, Mingkui Wang, Zhirui Xu, Yi Zhang, Lei Zhang, Yixing Chen, Hua Zhang, Siyuan Wang

Using a data sample of 106 million psi(3686) events collected with the BESIII detector operated at the BEPCII storage ring, we study for the first time the decays chi(cJ) -> phi(KSK +/-)-K-0 pi(-/+) and chi(cJ) -> phi K+K-pi(0) in the E1 radiative transiti ...

American Physical Society2015

The Physics of the B Factories

Olivier Schneider, Yiming Li, Aurelio Bay, Varun Sharma, Frédéric Blanc, Greig Alan Cowan, Remi Léandre Albert Louvot, Stewart Cole, Xin Chen, Jian Wang

Springer2014

Contribution of Genetic Background, Traditional Risk Factors, and HIV-Related Factors to Coronary Artery Disease Events in HIV-Positive Persons

Jacques Fellay, Amalio Telenti, Xuan Li

Background. Persons infected with human immunodeficiency virus (HIV) have increased rates of coronary artery disease (CAD). The relative contribution of genetic background, HIV-related factors, antiretroviral medications, and traditional risk factors to CA ...

Oxford University Press2013

Observation of New Resonant Structures in gamma gamma -> omega phi, phi phi, and omega omega

Olivier Schneider, Remi Léandre Albert Louvot, Yiming Li, Chao Wang, Tagir Aushev, Jun Yong Kim, Ji Hyun Kim, Xiao Wang, Jing Li, Xuan Li

The processes gamma gamma -> omega phi,phi phi, and omega omega are measured using an 870 fb(-1) data sample collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. Production of vector meson pairs is clearly observed and their c ...

2012

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Contribution of Genetic Background, Traditional Risk Factors, and HIV-Related Factors to Coronary Artery Disease Events in HIV-Positive Persons

Jacques Fellay, Amalio Telenti, Xuan Li

Oxford University Press2013