Publications by Jiayun Shen | EPFL Graph Search

Metropolitan Innovation Systems: Inquiry into the co-evolving relations between Industry, University and Government

Innovation is crucial and decisive for the long-term development of a metropolitan region in the global economy. While firms certainly play a significant role in the development of specific innovation, the environment that nur-tures innovative firms and di ...

EPFL2020

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

Measurement of cos 2 beta in B-0 -> D((*))h(0) with D -> K-S(0)pi(+) pi(-) decays by a combined time-dependent Dalitz plot analysis of BABAR and Belle data

Olivier Schneider, Roberto Gargiani, Yiming Li, Mingkui Wang, Mithilesh Nayak, Chao Wang, Gaétan Charles Antoine Giriat, Tagir Aushev, Greig Alan Cowan, Sun Hee Kim

We report measurements of sin 2 beta and cos 2 beta using a time-dependent Dalitz plot analysis of B-0 -> D((*))h(0) with D -> K-S(0)pi(+)pi(-) decays, where the light unflavored and neutral hadron h(0) is a pi(0),eta, or omega meson. The analysis uses a c ...

American Physical Society2018

Search for the rare decay of B+ -> l(+)nu e gamma with improved hadronic tagging

Olivier Schneider, Roberto Gargiani, Yiming Li, Mingkui Wang, Mithilesh Nayak, Chao Wang, Gaétan Charles Antoine Giriat, Sun Hee Kim, Tagir Aushev, Seyed Sina Mirrazavi Salehian

We present the result of the search for the rare B meson decay of B+ -> l(+)nu e gamma with l = e, mu. For the search the full data set recorded by the Belle experiment of 711 fb(-1) integrated luminosity near the Upsilon(4S) resonance is used. Signal cand ...

American Physical Society2018

First Evidence for cos 2 beta > 0 and Resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle Ambiguity

Olivier Schneider, Roberto Gargiani, Yiming Li, Mingkui Wang, Mithilesh Nayak, Gaétan Charles Antoine Giriat, Chao Wang, Tagir Aushev, Greig Alan Cowan, Sun Hee Kim

We present first evidence that the cosine of the CP-violating weak phase 2 beta is positive, and hence exclude trigonometric multifold solutions of the Cabibbo-Kobayashi-Maskawa (CKM) Unitarity Triangle using a time-dependent Dalitz plot analysis of B-0 -> ...

2018

Measurement of the decays Lambda c -> Sigma pi pi at Belle

Olivier Schneider, Yiming Li, Roberto Gargiani, Mingkui Wang, Gaétan Charles Antoine Giriat, Sun Hee Kim, Chao Wang, Tagir Aushev, Tara Nanut, Seyed Sina Mirrazavi Salehian

We report measurements of the branching fractions of the decays Lambda(+)(c) -> Sigma(+)pi(-)pi(+), Lambda(+)(c) -> Sigma(0)pi(+)pi(0) and Lambda(+)(c) -> Sigma(+)pi(0)pi(0) relative to the reference channel Lambda(+)(c) -> pK(-)p(+). The analysis is based ...

American Physical Society2018

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

Evidence of a structure in (K)over-bar(0)Lambda(+)(c) consistent with a charged Xi(c)(2930)(+), and updated measurement of (B)over-bar(0) -> (K)over-bar(0)Lambda(+)(c) (Lambda)over-bar(c)(-) at Belle

Olivier Schneider, Yiming Li, Roberto Gargiani, Mingkui Wang, Gaétan Charles Antoine Giriat, Sun Hee Kim, Chao Wang, Tagir Aushev, Tara Nanut, Chang-Hyun Park

We report evidence for the charged charmed-strange baryon Xi(c)(2930)(+) with a signal significance of 3.9 sigma with systematic errors included. The charged Xi(c)(2930)(+) is found in its decay to K-S(0)Lambda(+)(c) in the substructure of (B) over bar (0) ...

SPRINGER2018

Observation of gamma(2S) -> gamma eta(b)(1S) Decay

Olivier Schneider, Yiming Li, Roberto Gargiani, Chao Wang, Gaétan Charles Antoine Giriat, Sun Hee Kim, Tagir Aushev, Tara Nanut, Seyed Sina Mirrazavi Salehian, Jun Yong Kim

We report the observation of gamma(2S) -> gamma eta(b)(1S) based on an analysis of the inclusive photon spectrum of 24.7 fb(-1) of e(+)e(-) collisions at the gamma(2s) center-of-mass energy collected with the Belle detector at the KEKB asymmetric-energy e( ...

2018

Measurement of the branching fraction and time-dependent CP asymmetry for B-0 -> J/psi pi(0) decays

Olivier Schneider, Yiming Li, Roberto Gargiani, Mingkui Wang, Mithilesh Nayak, Chao Wang, Gaétan Charles Antoine Giriat, Sun Hee Kim, Tagir Aushev, Arnaud Michel Gelb

We measure the branching fraction and time-dependent CP-violating asymmetry for B-0 -> /psi pi(0) decays using a data sample of 711 fb(-1) collected on the Gamma(4S) resonance by the Belle experiment running at the KEKB e(+)e(-) collider. The branching fra ...

American Physical Society2018