B K Kim

Publications (23)3.77 Total impact

• Article: Radiological response predicts survival following transarterial chemoembolisation in patients with unresectable hepatocellular carcinoma.

  D Y Kim, H J Ryu, J Y Choi, J Y Park, D Y Lee, B K Kim, S U Kim, S H Ahn, C Y Chon, K-H Han
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  ABSTRACT: It remains unclear whether initial compact lipiodol uptake after transarterial chemoembolisation (TACE) is associated with improved survival in patients with hepatocellular carcinoma (HCC). To reveal the clinical relevance of compact lipiodolisation after TACE. We studied 490 patients with unresectable HCC who had first been treated with TACE. Compact lipiodolisation was defined as the absence of an arterial enhancing lesion, reflecting complete lipiodol uptake, as assessed by dynamic computed tomography (CT) 1 month after treatment. The rate of initial compact lipiodolisation was analysed according to multiplicity and size of tumour, and survival of patients who achieved compact lipiodolisation was compared to that of patients who did not. Of the 490 patients, 409 (83.5%) were in Child-Pugh class A and 81 (16.5%) in class B. The rate of initial compact lipiodolisation in single HCCs was higher than that in multinodular HCCs (33.7% vs. 14.6%, P < 0.001). Among single HCCs, the rate of compact lipiodolisation in tumours ≤5, 5-10 and >10 cm was 46.6%, 13.6%, and 0% respectively. The 1-, 3- and 5-year survival rates of patients with compact uptake were 92.7%, 70.7% and 52.4% compared to 60.8%, 28.0% and 16.9% in patients with noncompact lipiodolisation. Multivariate analysis revealed that Child-Pugh class, alpha-fetoprotein level, tumour node metastasis stage, portal vein thrombosis and initial compact lipiodolisation were independent predictors of survival. Initial compact lipiodol uptake after transarterial chemoembolisation is associated with improved survival in patients with unresectable hepatocellular carcinoma. Accordingly, initial complete lipiodolisation should be considered a relevant therapeutic target.
  Alimentary Pharmacology & Therapeutics 04/2012; 35(11):1343-50. · 3.77 Impact Factor
• Article: The advanced data searching system with AMGA at the Belle II experiment.

  J. H. Kim, S. Ahn, K. Cho, M. Bracko, Z. Drasal, T. Fifield, R. Frühwirth, R. Grzymkowski, T. Hara, M. Heck, S. Hwang, Y. Iida, Ryosuke Itoh, Go Iwai, H. Jang, Nobu Katayama, Yutaka Kawai, Christian Kiesling, B. K. Kim, T. Kuhr
  Computer Physics Communications. 01/2011; 182:270-273.
• Article: Belle II Technical Design Report

  T Abe, I. Adachi, K. Adamczyk, S Ahn, H. Aihara, K. Akai, M. Aloi, L. Andricek, K Aoki, Y Arai, [......], Z P Zhang, J Zhao, L Zhao, Z Zhao, V. Zhilich, P Zhou, V. Zhulanov, T. Zivko, A. Zupanc, O. Zyukova
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  ABSTRACT: The Belle detector at the KEKB electron-positron collider has collected almost 1 billion Y(4S) events in its decade of operation. Super-KEKB, an upgrade of KEKB is under construction, to increase the luminosity by two orders of magnitude during a three-year shutdown, with an ultimate goal of 8E35 /cm^2 /s luminosity. To exploit the increased luminosity, an upgrade of the Belle detector has been proposed. A new international collaboration Belle-II, is being formed. The Technical Design Report presents physics motivation, basic methods of the accelerator upgrade, as well as key improvements of the detector. Comment: Edited by: Z. Dole\v{z}al and S. Uno
  11/2010;
• Article: ψ(2S) two- and three-body hadronic decays

  J. Z. Bai, Y. Ban, J. G. Bian, I. Blum, X. Cai, J. F. Chang, H. F. Chen, H. S. Chen, J. Chen, Jie Chen, [......], B. Q. Zhou, G. M. Zhou, L. Zhou, K. J. Zhu, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, Z. A. Zhu, B. A. Zhuang, B. S. Zou
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  ABSTRACT: We report measurements of branching fractions for ψ(2S) decays into ωπ+π-, b1π, ωf2(1270), ωK+K-, ωpp̅ , φπ+π-, φf0(980), φK+K-, and an upper limit for φpp̅ final states based on a data sample of (4.02±0.22)×106ψ(2S) events collected with the BESI detector at the Beijing Electron-Positron Collider. The branching fractions for b1π and ωf2(1270) update previous BES results, while those for other decay modes are first measurements. The ratios of ψ(2S) and J/ψ branching fractions are smaller than what is expected from the 12% rule by a factor of 5 for ωf2(1270) and by a factor of 2 for ωπ+π-, ωpp̅ , and φK+K-, while for other studied channels the ratios are consistent with expectations within errors.
  Phys. Rev. D. 03/2003; 67(5).
• Article: Measurement of ψ(2S) decays to baryon pairs

  J. Z. Bai, Y. Ban, J. G. Bian, I. Blum, A. D. Chen, G. P. Chen, H. F. Chen, H. S. Chen, J. Chen, J. C. Chen, [......], L. S. Zheng, Z. P. Zheng, B. Q. Zhou, L. Zhou, K. J. Zhu, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, Z. A. Zhu, B. A. Zhuang
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  ABSTRACT: A sample of 3.95M ψ(2S) decays registered in the BES detector are used to study final states containing pairs of octet and decuplet baryons. We report branching fractions for ψ(2S)→pp̅ , ΛΛ̅ , Σ0Σ̅ 0, Ξ-Ξ̅ +, Δ++Δ̅ --, Σ+(1385)Σ̅ -(1385), Ξ0(1530)Ξ̅ 0(1530), and Ω-Ω̅ +. These results are compared to expectations based on the SU(3)-flavor symmetry, factorization, and perturbative QCD.
  Phys. Rev. D. 01/2001; 63(3).
• Article: Measurement of the mass and full width of the ηc meson

  J. Z. Bai, Y. Ban, J. G. Bian, I. Blum, A. D. Chen, G. P. Chen, H. F. Chen, H. S. Chen, J. Chen, J. C. Chen, [......], Y. H. Zheng, Z. P. Zheng, B. Q. Zhou, L. Zhou, K. J. Zhu, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, Z. A. Zhu, B. A. Zhuang
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  ABSTRACT: In a sample of 7.8 million J/ψ decays collected in the Beijing Spectrometer, the process J/ψ⃗γηc is observed for five different ηc decay channels: K+K-π+π-, π+π-π+π-, K±KS0π∓ (with KS0→π+π-), φφ (with φ⃗K+K-) and K+K-π0. From these signals, we determine the mass of ηc to be 2976.6±2.9±1.3 MeV. Combining this result with a previously reported result from a similar study using ψ(2S)→γηc detected in the same spectrometer gives mηc=2976.3±2.3±1.2 MeV. For the combined samples, we obtain Γηc=11.0±8.1±4.1 MeV.
  Phys. Rev. D. 08/2000; 62(7).
• Article: Direct measurement of B(D0→φX0) and B(D+→φX+)

  J. Z. Bai, Y. Ban, J. G. Bian, I. Blum, G. P. Chen, H. F. Chen, J. Chen, J. C. Chen, Y. Chen, Y. B. Chen, [......], Z. P. Zheng, B. Q. Zhou, G. P. Zhou, H. S. Zhou, L. Zhou, K. J. Zhu, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, B. A. Zhuang
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  ABSTRACT: The first measurement of B(D0→φX0) and an upper limit for B(D+→φX+) are determined from 22.3 pb-1 of e+e- annihilation data at a c.m. energy of 4.03 GeV. The data were recorded by the Beijing Spectrometer (BES) at BEPC. A recoil charge method is applied to charm threshold data to determine the charge of the D meson in the recoil from 9054±309±416 reconstructed D0, D+ mesons. The branching fractions B(D0→φX0)=(1.71-0.71+0.76±0.17)%, and B(D+→φX+)<1.8% are determined from 10 events with a reconstructed D and a recoiling φ. In addition, a 90% C.L. upper limit of B(D+→φe+X0)<1.6% is determined from a search for semileptonic decays of the D+.
  Phys. Rev. D. 07/2000; 62(5).
• Article: ψ(2S)→π+π-J/ψ decay distributions

  J. Z. Bai, Y. Ban, J. G. Bian, I. Blum, G. P. Chen, H. F. Chen, J. Chen, J. C. Chen, Y. Chen, Y. B. Chen, [......], Z. P. Zheng, B. Q. Zhou, G. P. Zhou, H. S. Zhou, L. Zhou, K. J. Zhu, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, B. A. Zhuang
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  ABSTRACT: Using a sample of 3.8 M ψ(2S) events accumulated with the BES detector, the process ψ(2S)→π+π-J/ψ is studied. The angular distributions are compared with the general decay amplitude analysis of Cahn. We find that the dipion system requires some D wave amplitude, as well as S wave. On the other hand, the J/ψ-(π+π-) relative angular momentum is consistent with being pure S wave. The decay distributions have been fit to heavy quarkonium models, including the Novikov-Shifman model. This model, which is written in terms of the parameter κ, predicts that D wave pions should be present. We determine κ=0.183±0.002±0.003 based on the joint mππ-cosθπ* distribution. The fraction of D wave amplitude as a function of mππ is found to decrease with increasing mππ, in agreement with the model. We have also fit the Mannel-Yan model, which is another model that allows D wave pions.
  Phys. Rev. D. 07/2000; 62(3).
• Article: Measurement of the inclusive charm cross section at 4.03 GeV and 4.14 GeV

  J. Z. Bai, Y. Ban, J. G. Bian, I. Blum, G. P. Chen, H. F. Chen, J. Chen, J. C. Chen, Y. Chen, Y. B. Chen, [......], Z. P. Zheng, B. Q. Zhou, G. P. Zhou, H. S. Zhou, L. Zhou, K. J. Zhu, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, B. A. Zhuang
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  ABSTRACT: The cross section for charmed meson production at √s=4.03 and 4.14 GeV has been measured with the Beijing Spectrometer. The measurement was made using 22.3 pb-1 of e+e- data collected at 4.03 GeV and 1.5 pb-1 of e+e- data collected at 4.14 GeV. Inclusive observed cross sections for the production of charged and neutral D mesons and momentum spectra are presented. Observed cross sections were radiatively corrected to obtain tree level cross sections. Measurements of the total hadronic cross section are obtained from the charmed meson cross section and an extrapolation of results from below the charm threshold.
  Phys. Rev. D. 06/2000; 62(1).
• Article: Study of the hadronic decays of χc states

  J. Z. Bai, Y. Ban, J. G. Bian, I. Blum, G. P. Chen, H. F. Chen, J. Chen, J. C. Chen, Y. Chen, Y. B. Chen, [......], Z. P. Zheng, B. Q. Zhou, G. P. Zhou, H. S. Zhou, L. Zhou, K. J. Zhu, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, B. A. Zhuang
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  ABSTRACT: Hadronic decays of the P-wave spin-triplet charmonium states χcJ(J=0,1,2) are studied using a sample of ψ(2S) decays collected by the BES detector operating at the BEPC storage ring. Branching fractions for the decays χc1→KS0K+π-+c.c., χc0→KS0KS0, χc2→KS0KS0, χc0→φφ, χc2→φφ and χcJ→K+K-K+K- are measured for the first time, and those for χcJ→π+π-π+π-, χcJ→π+π-K+K-, χcJ→π+π-pp̅ and χcJ→3(π+π-) are measured with improved precision. In addition, we determine the masses of the χc0 and ηc to be Mχc0=3414.1±0.6(stat)±0.8(syst) MeV and Mηc=2975.8±3.9(stat)±1.2(syst) MeV.
  Phys. Rev. D. 09/1999; 60(7).
• Article: Determination of J/ψ leptonic branching fraction via ψ(2S)→π+π-J/ψ

  J. Z. Bai, J. G. Bian, I. Blum, Z. W. Chai, G. P. Chen, H. F. Chen, J. Chen, J. C. Chen, Y. Chen, Y. B. Chen, [......], J. P. Zheng, L. S. Zheng, Z. P. Zheng, G. P. Zhou, H. S. Zhou, L. Zhou, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, B. A. Zhuang
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  ABSTRACT: A comparison of the rates for ψ(2S)→π+π-J/ψ, J/ψ⃗l+l- and J/ψ⃗ anything is used to determine the J/ψ leptonic branching fractions. The results are B(J/ψ⃗e+e-)=(5.90±0.05±0.10)% and B(J/ψ⃗μ+μ-)=(5.84±0.06±0.10)%, where the first error is statistical and the second is systematic. Assuming lepton universality, the leptonic branching fraction of the J/ψ is B(J/ψ⃗l+l-)=(5.87±0.04±0.09)% per species. This result is used to estimate the QCD scale factor ΛMS¯(4) and the strong coupling constant αs.
  Phys. Rev. D. 09/1998; 58(9).
• Article: Branching fractions for ψ(2S)→γη′ and γη

  J. Z. Bai, J. G. Bian, I. Blum, Z. W. Chai, G. P. Chen, H. F. Chen, J. Chen, J. C. Chen, Y. Chen, Y. B. Chen, [......], J. P. Zheng, L. S. Zheng, Z. P. Zheng, G. P. Zhou, H. S. Zhou, L. Zhou, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, B. A. Zhuang
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  ABSTRACT: We report first measurements of the branching fractions B(ψ2S→γη′)=(1.54±0.31±0.20)×10-4 and B(ψ2S→γη)=(0.53±0.31±0.08)×10-4. The ψ(2S)→γη′ result is consistent with expectations of a model that considers the possibility of η′-ηc(2S) mixing. The ratio of the ψ(2S)→γη′ and ψ(2S)→γη rates is used to determine the pseudoscalar octet-singlet mixing angle.
  Phys. Rev. D. 09/1998; 58(9).
• Article: Search for ψ(2S) production in e+e- annihilations at 4.03 GeV

  J. Z. Bai, J. G. Bian, I. Blum, Z. W. Chai, G. P. Chen, H. F. Chen, J. Chen, J. C. Chen, Y. Chen, Y. B. Chen, [......], J. P. Zheng, L. S. Zheng, Z. P. Zheng, G. P. Zhou, H. S. Zhou, L. Zhou, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, B. A. Zhuang
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  ABSTRACT: A search is performed for the production of the ψ(2S) in e+e- annihilation at a center-of-mass energy of 4.03 GeV using the BES detector operated at the Beijing Electron Positron Collider (BEPC). The kinematic features of the reconstructed ψ(2S) signal are consistent with its being produced only in association with an energetic photon resulting from initial state radiation (ISR). Limits are placed on ψ(2S) production from the decay of unknown charmonia or metastable hybrids that might be produced in e+e- annihilations at 4.03 GeV. Under the assumption that the observed cross section for ψ(2S) production is due entirely to ISR, the partial width Γee of the ψ(2S) is measured to be 2.07±0.32keV.
  Phys. Rev. D. 03/1998; 57(7).
• Article: Erratum: Search for a vector glueball by a scan of the J/ψ resonance [Phys. Rev. D 54, 1221 (1996)]

  J. Z. Bai, O. Bardon, I. Blum, A. Breakstone, T. Burnett, G. P. Chen, H. F. Chen, J. Chen, S. M. Chen, Y. Chen, [......], G. P. Zhou, H. S. Zhou, L. Zhou, X. F. Zhou, Y. H. Zhou, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, B. A. Zhuang, G. Zioulas
  Physical review D: Particles and fields 02/1998; 57:3187.
• Article: Direct measurement of B(Ds+→φX+)

  J. Z. Bai, O. Bardon, I. Blum, A. Breakstone, T. Burnett, G. P. Chen, H. F. Chen, J. Chen, S. J. Chen, S. M. Chen, [......], Z. P. Zheng, G. P. Zhou, H. S. Zhou, L. Zhou, X. F. Zhou, Y. H. Zhou, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, B. A. Zhuang
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  ABSTRACT: The absolute inclusive branching fraction of Ds+→φX+ has been measured from data collected by the BES detector at a center-of-mass energy of 4.03 GeV, corresponding to an integrated luminosity of 22.3 pb-1. At this energy, direct pair production e+e-→Ds+Ds- has been observed. We have selected Ds candidate events by reconstructing five hadronic decay modes Ds+→φπ+, K0*K+, K0K+, f0π+ and K0K-π+π+ and have searched for inclusive φ’s in the recoiling Ds-. We observed three recoiling φ’s in the 166.4 ± 31.8 Ds candidate events, which leads to the absolute branching fraction B(Ds+→φX+)=(17.8-7.2+15.1-6.3+0.6) % and B(Ds+→φπ+)=(3.6-1.6+3.1-1.3+0.4) %.
  Phys. Rev. D. 12/1997; 57(1).
• Article: Measurement of the branching fraction of Ds inclusive semileptonic decay Ds+→e+X

  J. Z. Bai, O. Bardon, J. G. Bian, I. Blum, A. Breakstone, T. Burnett, Z. W. Chai, G. P. Chen, H. F. Chen, J. Chen, [......], L. S. Zheng, Z. P. Zheng, G. P. Zhou, H. S. Zhou, L. Zhou, Y. H. Zhou, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, B. A. Zhuang
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  ABSTRACT: The absolute inclusive semileptonic branching fraction of the Ds meson has been measured based on 22.3pb-1 of e+e- collision data collected with the Beijing Spectrometer at √s=4.03GeV. At this energy, the Ds are produced in pairs: e+e-→Ds+Ds-. We reconstructed 171±21±15 Ds events in five hadronic decay modes. In the recoil system of these events, several Ds inclusive semileptonic decays were observed and the branching fraction is estimated to be B(Ds+→e+X)=(7.7-4.3-2.1+5.7+2.4)%.
  Phys. Rev. D. 09/1997; 56(7).
• Article: First measurement of the branching fraction of the decay ψ(2S)→τ+τ-

  J. Z. Bai, Y. Ban, J. G. Bian, I. Blum, A. D. Chen, H. F. Chen, H. S. Chen, J. Chen, J. C. Chen, X. D. Chen, [......], B. Q. Zhou, G. M. Zhou, L. Zhou, K. J. Zhu, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, Z. A. Zhu, B. A. Zhuang, B. S. Zou
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  ABSTRACT: The branching fraction of the ψ(2S) decay into τ+τ- has been measured for the first time using the BES detector at the Beijing Electron-Positron Collider. The result is Bττ=(2.71±0.43±0.55)×10-3, where the first error is statistical and the second is systematic. This value, along with those for the branching fractions into e+e- and μ+μ- of this resonance, satisfy well the relation predicted by the sequential lepton hypothesis. Combining all these values with the leptonic width of the resonance, the total width of the ψ(2S) is determined to be (252±37)keV.
  Phys. Rev. D. 65(5).
• Article: Radiative decay of the ψ(2S) into two pseudoscalar mesons

  J. Z. Bai, Y. Ban, J. G. Bian, I. Blum, A. D. Chen, G. P. Chen, H. F. Chen, H. S. Chen, J. Chen, J. C. Chen, [......], L. S. Zheng, Z. P. Zheng, B. Q. Zhou, L. Zhou, K. J. Zhu, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, Z. A. Zhu, B. A. Zhuang
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  ABSTRACT: Radiative decays of the radially excited charmonium resonance, ψ(2S), into ππ, KK̅ and ηη final states have been measured in a sample of 4.02×106 ψ(2S) events collected by the BES Collaboration. The branching ratios B(ψ(2S)→γf2(1270))=(2.12±0.19±0.32)×10-4 and B(ψ(2S)→γf0(1710))×B(f0(1710)→K+K-)=(3.02±0.45±0.66)×10-5 are obtained. When compared to the corresponding radiative J/ψ decays, the observed ψ(2S) radiative decay rates into γf2(1270) and γf0(1710) are consistent with the prediction of the “12%” rule.
  Phys. Rev. D. 67(3).
• Article: The BES upgrade

  J.Z. Bai, H.C. Bao, I. Blum, Z.W. Chai, G.P. Chen, H.F. Chen, J. Chen, J.C. Chen, Y. Chen, Y.B. Chen, [......], B.Q. Zhou, G.P. Zho, H.S. Zhou, L. Zhou, X.F. Zhou, K.J. Zhu, Q.M. Zhu, Y.C. Zhu, Y.S. Zhu, B.A. Zhuang
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  ABSTRACT: The Beijing Spectrometer (BES) detector is a general purpose solenoid detector at the Beijing Electron Positron Collider (BEPC) in Beijing, China, that has collected large numbers of J/ψ, ψ′, Ds, D and τ events. In this paper, we describe the recent upgrade of the initial BES detector (BESI) to the improved BESII detector.
  Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.
• Article: Precision measurement of $J/\psi$ leptonic branching fraction

  J Z Bai, O Bardon, I K Blum, A Breakstone, T H Burnett, G P Chen, H F Chen, J Chen, S J Chen, Chen Sheng M, [......], G P Zhou, H S Zhou, L Zhou, X F Zhou, Y H Zhou, Q M Zhu, Y C Zhu, Y S Zhu, B A Zhuang, G Zioulas