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Ji Hyun Kim

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Publications associées (279)

A search for flaring very-high-energy cosmic gamma-ray sources with the L3+C muon spectrometer

Eduardo Sanchez, Horst Vogel, Aurelio Bay, Yu Lei, Jian Zhao, Camille Haller, Liang Sun, Qian Wang, Zhirui Xu, Matthias Weber, Ji Hyun Kim, Werner Lustermann, Xiao Wang, Yifei Guo, Xuan Yang, Zheng Wang

The L3+C muon detector at the CERN electron-positron collider, LEP, is used for the detection of very-high-energy cosmic gamma-ray sources through the observation of muons of energies above 20, 30, 50 and 100 GeV. Daily or monthly excesses in the rate of s ...

Elsevier2006

Search for neutral MSSM Higgs bosons at LEP

André Rouge, Eduardo Sanchez, Horst Vogel, Aurelio Bay, Jian Zhao, Bénédicte Marie Maréchal, Frédéric Teubert, Rémy Teuscher, Liang Sun, Shan Jin, Songmei Wu, Qian Wang, Greig Alan Cowan, Csaba Hajdu, Zhirui Xu, Francesco Cerutti, Mark Tobin, Peter Hansen, Lei Zhang, John Wilson, Paolo Ronchese, Matthias Weber, Ji Hyun Kim, Georgios Anagnostou, Simone Campana, Werner Lustermann, Xiao Wang, Zheng Wang

2006

Measurements of B decays to two kaons

Aurelio Bay, Sun Hee Kim, Tagir Aushev, Stewart Cole, Vladislav Balagura, Ji Hyun Kim, Jing Li

We report measurements of B meson decays to two kaons using 253fb-1 of data collected with the Belle detector at the KEKB energy-asymmetric e+e- collider. We find evidence for signals in B+→K̄0K+ and B0→K0K̄0 with significances of 3.0σ and 3.5σ, respective ...

2005

Search for an invisibly-decaying Higgs boson at LEP

Eduardo Sanchez, Horst Vogel, Aurelio Bay, Jian Zhao, Liang Sun, Qian Wang, Zhirui Xu, Matthias Weber, Ji Hyun Kim, Werner Lustermann, Xiao Wang, Zheng Wang

A search for a Higgs boson produced in e(+)e(-) collisions in association with a Z boson and decaying into invisible particles is performed. Data collected at LEP with the U detector at centre-of-mass energies from 189 to 209 GeV are used, corresponding to ...

Elsevier2005

Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP

Eduardo Sanchez, Horst Vogel, Aurelio Bay, Jian Zhao, Liang Sun, Qian Wang, Zhirui Xu, Matthias Weber, Ji Hyun Kim, Werner Lustermann, Xiao Wang, Zheng Wang

The evolution of the electromagnetic coupling, α, in the momentum-transfer range 1800 GeV2 < -Q2 < 21600 GeV2 is studied with about 40 000 Bhabha-scattering events collected with the L3 detector at LEP at centre-of-mass energies √s = 189-209 GeV. The runni ...

2005

Observation of B-→J/ψΛp̄ and searches for B-→J/ψΣ0p̄ and B0→J/ψpp̄ decays

Olivier Schneider, Sun Hee Kim, Tagir Aushev, Mingkui Wang, Stewart Cole, Chao Wang, Yuan Yuan, Lei Zhang, Ji Hyun Kim, Jing Li

We report the observation of B-→J/ψΛp̄ and searches for B-→J/ψΣ0p̄ and B0→J/ψpp̄ decays, using a sample of 275×106 BB̄ pairs collected with the Belle detector at the Υ(4S) resonance. We observe a signal of 17.2±4.1 events with a significance of 11.1σ and o ...

American Physical Society2005

Measurement of exclusive ρ+ρ- production in mid-virtuality two-photon interactions and study of the γγ* → ρρ process at LEP

Eduardo Sanchez, Horst Vogel, Aurelio Bay, Jian Zhao, Liang Sun, Qian Wang, Zhirui Xu, Matthias Weber, Ji Hyun Kim, Werner Lustermann, Xiao Wang, Zheng Wang

Exclusive ρ+ρ- production in two-photon collisions between a quasi-real photon, γ, and a mid-virtuality photon, γ*, is studied with data collected at LEP at centre-of-mass energies 183 GeV≤√s≤209 GeV with a total integrated luminosity of 684.8 pb-1. The cr ...

2005

Phase diagram of pseudobinary Pb(Yb1/2Nb1/2)O-3-Pb(Sc1/2Nb1/2)O-3 ceramic solid solution

Nava Setter, Ji Hyun Kim

Crystal structure and dielectric properties of (1-x)Pb(Yb1/2Nb1/2)O-3-xPb(Sc1/2Nb1/2)O-3 (PYN1-xPSNx) (0less than or equal toxless than or equal to0.60) solid solution have been studied, and its pseudobinary phase diagram has been determined. The low-tempe ...

2005

Measurement of the photon structure function F2 γ with the L3 detector at LEP

Eduardo Sanchez, Horst Vogel, Aurelio Bay, Jian Zhao, Liang Sun, Qian Wang, Zhirui Xu, Matthias Weber, Ji Hyun Kim, Werner Lustermann, Xiao Wang, Zheng Wang

The e+e-→e+e-hadrons reaction, where one of the two electrons is detected in a low polar-angle calorimeter, is analysed in order to measure the hadronic photon structure function F2 γ. The full high-energy and high-luminosity data set, collected with the L ...

2005

Branching fraction, polarization and CP-violating asymmetries in B 0→D+D- decays

Aurelio Bay, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Mingkui Wang, Chao Wang, Vladislav Balagura, Lei Zhang, Ji Hyun Kim, Jing Li

We present measurements of the branching fraction, the polarization parameters and CP-violating asymmetries in B0→D*+D *- decays using a 140 fb-1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e- collid ...

2005

Observation of B0→π0π0

Aurelio Bay, Sun Hee Kim, Tagir Aushev, Sanjeev Kumar, Ji Hyun Kim, Jing Li

We report the observation of the decay B0→π0π0, using a 253fb-1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB e+e- collider. The measured branching fraction is B(B0→π0π0)= (2.3-0.5-0.3+0.4+0.2)×10-6, with a significance o ...

2005

Measurement of the branching fraction and CP asymmetry in B+ ρ +π0

Aurelio Bay, Tagir Aushev, Sanjeev Kumar, Ji Hyun Kim, Jing Li

We report a measurement of the branching fraction for the decay B + → ρ+π0 based on a 140 fb -1 data sample collected with the Belle detector at the KEKB asymmetric e+e- collider. We measure the branching fraction B(B+ →+π0) = (13.2 ± 2.3(stat)-1.9 +(syst) ...

2005

Observation of the D1(2420)→Dπ+π- decays

Sun Hee Kim, Tagir Aushev, Ji Hyun Kim, Jing Li

We report on the first observation of D10(2420)→D0π-π+ and D1+(2420)→D+π-π+ decays (where the contribution from the dominant known D1→D*π decay mode is excluded) in the B-→D10π- and B̄0→D1+π- decays, respectively. The observation is based on 15.2×107 BB̄ e ...

2005

Search for D0-D¯0 mixing using semileptonic decays at Belle

Olivier Schneider, Sun Hee Kim, Tagir Aushev, Mingkui Wang, Stewart Cole, Chao Wang, Lei Zhang, Ji Hyun Kim, Jing Li

American Physical Society2005

Search for D0-D¯0 Mixing in D0→K+π- Decays and Measurement of the Doubly-Cabibbo-Suppressed Decay Rate

Aurelio Bay, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Stewart Cole, Chao Wang, Yuan Yuan, Lei Zhang, Ji Hyun Kim, Zheng Zheng, Zhi Zheng, Jing Li

2005

Improved measurement of CP-violation parameters sin⁡2ϕ_{1} and |λ|, B meson lifetimes, and B^{0}-B[over ¯]^{0} mixing parameter Δm_{d}

Aurelio Bay, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Stewart Cole, Chao Wang, Lei Zhang, Ji Hyun Kim, Jing Li

American Physical Society2005

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Ji Hyun Kim

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A search for flaring very-high-energy cosmic gamma-ray sources with the L3+C muon spectrometer

Search for neutral MSSM Higgs bosons at LEP

Measurements of B decays to two kaons

Search for an invisibly-decaying Higgs boson at LEP

Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP

Observation of B-→J/ψΛp̄ and searches for B-→J/ψΣ0p̄ and B0→J/ψpp̄ decays

Measurement of exclusive ρ+ρ- production in mid-virtuality two-photon interactions and study of the γγ* → ρρ process at LEP

Phase diagram of pseudobinary Pb(Yb1/2Nb1/2)O-3-Pb(Sc1/2Nb1/2)O-3 ceramic solid solution

Measurement of the photon structure function F2 γ with the L3 detector at LEP

Branching fraction, polarization and CP-violating asymmetries in B 0→D+D- decays

Observation of B0→π0π0

Measurement of the branching fraction and CP asymmetry in B+ ρ +π0

Observation of the D1(2420)→Dπ+π- decays

Search for D0-D¯0 mixing using semileptonic decays at Belle

Search for D0-D¯0 Mixing in D0→K+π- Decays and Measurement of the Doubly-Cabibbo-Suppressed Decay Rate

Improved measurement of CP-violation parameters sin⁡2ϕ_{1} and |λ|, B meson lifetimes, and B^{0}-B[over ¯]^{0} mixing parameter Δm_{d}

Dalitz analysis of the three-body charmless decays B+→K+π+π- and B+→K+K+K-

Observation of B^{+}→K_{1}(1270)^{+}γ

Observation of an Isotriplet of Excited Charmed Baryons Decaying to Λc+π