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Sun Hee Kim

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Related publications (414)

Full tokamak discharge simulation and kinetic plasma profile control for ITER

Sun Hee Kim

Understanding non-linearly coupled physics between plasma transport and free-boundary equilibrium evolution is essential to operating future tokamak devices, such as ITER and DEMO, in the advanced tokamak operation regimes. To study the non-linearly couple ...

EPFL2009

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

Measurement of D^{+}→K_{S}^{0}K^{+} and D_{s}^{+}→K_{S}^{0}π^{+} branching ratios

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

We report an improved measurement of D+->(KSK+)-K-0 and D-s(+)-> K-S(0)pi(+) branching ratios using 605 fb(-1) of data collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The measured branching ratios with respect to the Cabi ...

American Physical Society2009

Precise measurement of hadronic τ-decays with an η meson

Remi Léandre Albert Louvot, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Chao Wang, Xiao Wang

We have studied hadronic τ decay modes involving an η meson using 490 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. The following branching fractions have been measured: B (τ- → K- η ντ) = (1.58 ± 0.05 ± 0.09) ...

2009

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 e+e-→D0D*-π+ cross section using initial-state radiation

Aurelio Bay, Remi Léandre Albert Louvot, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Chao Wang, Vladislav Balagura, Thomas Muller, Ji Hyun Kim, Xiao Wang, Jing Li

We report measurements of the exclusive cross section for e(+)e(-)->(DD*-)-D-0 pi(+) as a function of center-of-mass energy from the (DD*-)-D-0 pi(+) threshold to 5.2 GeV with initial-state radiation. No evidence is found for Y(4260)->(DD*-)-D-0 pi(+) deca ...

American Physical Society2009

Measurement of the branching fraction for the decay Υ(4S) →Υ(1S)π+π-

Aurelio Bay, Remi Léandre Albert Louvot, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Mingkui Wang, Chao Wang, Xiao Wang, Jing Li

We study transitions between Υ states with the emission of charged pions using 604.6fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The measured product branching fraction is B(Υ(4S)→Υ(1S)π+π-)×B(Υ(1S)→μ+μ-)=(2. ...

American Physical Society2009

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

Observation of the doubly cabibbo-suppressed decay Ds+→K+K+π-

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

We report the first observation of the doubly Cabibbo-suppressed decay Ds+→K+K+π- using 605fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The branching ratio with respect to its Cabibbo-favored counterpart B(Ds+ ...

2009

Comparing magnetic triggering of ELMs in TCV and ASDEX Upgrade

Jonathan Bryan Lister, Yves Martin, Laurent Villard, Sun Hee Kim

Frequency locking of edge localized modes (ELMs) to the vertical plasma movements induced by magnetic perturbations first demonstrated in TCV was successfully repeated in ASDEX Upgrade. However, the ELMs were triggered in ASDEX Upgrade when the plasma was ...

2009

Full tokamak discharge simulation of ITER by combining DINA-CH and CRONOS

Jonathan Bryan Lister, Sun Hee Kim

A full tokamak discharge simulator has been developed by combining a free-boundary equilibrium evolution code, DINA-CH, and an advanced transport modelling code, CRONOS. The combined tokamak discharge simulator provides a full simulation of a whole tokamak ...

2009

Lower hybrid assisted plasma current ramp-up in ITER

Jonathan Bryan Lister, Sun Hee Kim

Lower hybrid (LH) assisted plasma current ramp-up in ITER is demonstrated using a free-boundary full tokamak discharge simulator which combines the DINA-CH and CRONOS codes. LH applied from the initial phase of the plasma current ramp-up increases the safe ...

2009

Observation of a near-threshold enhancement in the e+e- →Λc+Λc- Cross section using initial-state radiation

Olivier Schneider, Sun Hee Kim, Tagir Aushev, Mingkui Wang, Chao Wang, Vladislav Balagura, Xiao Wang, Jing Li

We report a measurement of the exclusive e+e-→Λc+Λc- cross section as a function of center-of-mass energy near the Λc+Λc- threshold. A clear peak with a significance of 8.2σ is observed in the Λc+Λc- invariant mass distribution just above threshold. With a ...

2008

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 B0→J/ψ decays

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

We report a search for the decay B0→J/ψ, using a sample of 657×106 BB̄ pairs collected with the Belle detector at the Υ(4S) resonance. No statistically significant signal is found and an upper limit for the branching fraction is determined to be B(B0→J/ψ)< ...

American Physical Society2008

Observation of B±→ψ(2S)π± and search for direct CP violation

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

We report the first observation of B±→ψ(2S)π±, a Cabibbo- and color-suppressed decay. This analysis is based on 657×106 BB̄ events collected at the Υ(4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e- collider. The measured branching ...

American Physical Society2008

Measurement of the near-threshold e+e-→DD̄ cross section using initial-state radiation

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

We report measurements of the exclusive cross section for e+e-→DD̄, where D=D0 or D+, in the center-of-mass energy range from the DD̄ threshold to 5 GeV with initial-state radiation. The analysis is based on a data sample collected with the Belle detector ...

American Physical Society2008

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

Search for a CP asymmetry in Cabibbo-suppressed D0 decays

Aurelio Bay, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Chao Wang, Xiao Wang

We measure the CP-violating asymmetries in decays to the D0 → K+ K- and D0 → π+ π- CP eigenstates using 540 fb-1 of data collected with the Belle detector at or near the Υ{hooked} (4 S) resonance. Cabibbo-favored D0 → K- π+ decays are used to correct for s ...

2008

Measurement of B(Ds+→μ+νμ)

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

We present a measurement of the branching fraction B(Ds+→μ+νμ ) using a 548fb-1 data sample collected by the Belle experiment at the KEKB e+e- collider. The Ds momentum is determined by reconstruction of the system recoiling against DKγX in events of the t ...

2008

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