Publications associées à Loi du χ

Observation of the Radiative Decays of Upsilon(1S) to chi(c1)

Olivier Schneider, Yiming Li, Mingkui Wang, Chao Wang, Tagir Aushev, Sun Hee Kim, Donghyun Kim, Xiao Wang

We report the first observation of the radiative decay of the Upsilon(1S) into a charmonium state. The significance of the observed signal of Upsilon(1S) -> gamma chi(c1) is 6.3 standard deviations including systematics. The branching fraction is calculate ...

AMER PHYSICAL SOC2020

Search for a Light CP-odd Higgs Boson and Low-Mass Dark Matter at the Belle Experiment

Olivier Schneider, Yiming Li, Roberto Gargiani, Chao Wang, Mithilesh Nayak, Gaétan Charles Antoine Giriat, Tagir Aushev, Sun Hee Kim, Tara Nanut, Ke Huang

We report on the first Belle search for a light CP-odd Higgs boson, A(0), that decays into low mass dark matter, chi, in final states with a single photon and missing energy. We search for events produced via the dipion transition (sic)(2S) -> (sic)(1S)pi( ...

2019

Observation of e(+) e(-) -> gamma chi(c1) and search for e(+) e(-) -> gamma chi(c0), gamma chi(c2), and gamma eta(c) at root s near 10.6 GeV at Belle

Olivier Schneider, Yiming Li, Roberto Gargiani, Mingkui Wang, Gaétan Charles Antoine Giriat, Chao Wang, Sun Hee Kim, Tagir Aushev, Timothy Chi Hin Liew, Chang-Hyun Park

Using data samples of 89.5 fb(-1), 711.0 fb(-1), and 121.4 fb(-1) collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider at center-of-mass energies 10.52, 10.58, and 10.867 GeV, respectively, we study the exclusive reactions e(+) ...

American Physical Society2018

Measurement of e(+)e(-) -> gamma chi(cJ) via initial state radiation at Belle

Olivier Schneider, Tagir Aushev, Sun Hee Kim, Jun Yong Kim, Ji Hyun Kim, Donghyun Kim, Dipanwita Dutta, Xiao Wang

The process e(+)e(-) -> gamma chi(cJ) (J = 1, 2) is studied via initial state radiation using 980 fb(-1) of data at and around the Gamma(nS) (n = 1, 2, 3, 4, 5) resonances collected with the Belle detector at the KEKB asymmetricenergy e(+)e(-) collider. No ...

American Physical Society2015

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

A weighted empirical interpolation method: a priori convergence analysis and applications

Alfio Quarteroni, Gianluigi Rozza, Peng Chen

We extend the classical empirical interpolation method to a weighted empirical interpolation method in order to approximate nonlinear parametric functions with weighted parameters, e.g. random variables obeying various probability distributions. A priori c ...

EDP Sciences2014

Search for charmonium and charmoniumlike states in gamma(2S) radiative decays

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

Using a sample of 158 x 10(6) gamma (2S) events collected with the Belle detector, charmonium and charmoniumlike states with even charge parity are searched for in gamma (2S) radiative decays. No significant chi(cJ) or eta(c) signal is observed, and the fo ...

American Physical Society2011

Search for charmonium and charmoniumlike states in Υ(1S) radiative decays

Olivier Schneider, Remi Léandre Albert Louvot, Mingkui Wang, Chao Wang, Tagir Aushev, Vladislav Balagura, Xiao Wang, Jing Li

Using a sample of 102 X 10(6) Y(1S) events collected with the Belle detector, we report on the first search for charge-parity-even charmonium and charmoniumlike states in Y(1S) radiative decays. No significant chi(cJ) or eta(c) signal is observed and 90% C ...

American Physical Society2010

Relaxation processes of point defects in vitreous silica from femtosecond to nanoseconds

Majed Chergui, Frank van Mourik, Andrea Cannizzo, Wojciech Gawelda, Erwin Portuondo Campa, Andrea Callegari

The authors studied ultrafast relaxation of localized excited states at Ge-related O deficient centers in SiO2 using femtosecond transient-absorption spectroscopy. The relaxation dynamics exhibits a biexponential decay, which the authors ascribe to the dep ...

2008

Moments of the hadronic invariant mass spectrum in B→Xclν decays at Belle

Olivier Schneider, Aurelio Bay, Stewart Cole, Mingkui Wang, Chao Wang, Lei Zhang

We present a measurement of the hadronic invariant mass squared (MX2) spectrum in charmed semileptonic B meson decays B→Xc ν based on 140fb-1 of Belle data collected near the Υ(4S) resonance. We determine the first, the second central, and the second nonce ...

American Physical Society2007