Showing papers by "Jie Zhang published in 1998"
TL;DR: In this article, the flavour changing neutral current decay b→sγ has been detected in hadronic Z decays collected by ALEPH at LEP, which is isolated in lifetime-tagged b b events by the presence of a hard photon associated with a system of high momentum and high rapidity hadrons.
258 citations
TL;DR: In this article, the ALEPH detector at LEP1 has been used for detailed studies of both perturbative and non-perturbative aspects of strong interactions to be carried out using hadronic Z and tau decays.
224 citations
Patent•
02 Sep 1998
TL;DR: In this article, the atoms necessary to form a fused mono-, bi- or tricyclic, carbocylic or heterocyclic ring were defined, where each individual ring has 5-6 ring member atoms.
Abstract: Compound, compositions containing compounds, methods of using compounds, and processes of making compounds, of formula (I) containing at least one ring nitrogen, or a pharmaceutically acceptable base or acid addition salt, hydrate, ester, solvate, prodrug, metabolite, stereoisomer or mixtures thereof, wherein: X is double-bonded oxygen, or -OH; when R7 is present, it is hydrogen or lower alkyl; y represents the atoms necessary to form a fused mono-, bi- or tricyclic, carbocylic or heterocyclic ring, wherein each individual ring has 5-6 ring member atoms; and Z is (i) -CH2CHR3- wherein R?2 and R3? are independently hydrogen, alkyl, aryl or aralkyl; (ii) -R6C=CR3- wherein R?3 and R6? are independently hydrogen, lower alkyl, aryl, aralkyl, halo, -NO?2?, -COOR?7?, or -NR7R8 where R8 is independently hydrogen or C?1?-C9 alkyl, or R?6 and R3?, taken together, form a fused aromatic ring, wherein each individual ring has 5-6 ring members; (iii) -R2C=N-; (iv) -CR?2(OH)-NR7?; or (v) -C(O)-NR7-.
90 citations
Patent•
31 Dec 1998
TL;DR: In this article, a method for using compounds of formula (R1-R9 and Z are independently hydrogen, hydroxy, halo, Halo-alkyl, thiocarbonyl, cyano, nitro, amino, imino, alkylamino, amino acid, sulfhydryl, thioalkyl and alkylthio.
Abstract: This invention relates to compounds, pharmaceutical compositions, and methods of using compounds of formula (I) wherein R1-R9 and Z are independently hydrogen, hydroxy, halo, haloalkyl, thiocarbonyl, cyano, nitro, amino, imino, alkylamino, aminoalkyl, sulfhydryl, thioalkyl, alkylthio, sulfonyl, alkylsulfonyl, C1-C9 straight or branched chain alkyl, C2-C9 straight or branched chain alkenyl, C2-C9 straight or branched chain alkynyl, C1-C6 straight or branched chain alkoxy, C2-C6 straight or branched chain alkenoxy, C2-C6 straight or branched chain alkynoxy, aryl, carbocycle, heterocycle, aralkyl, alkylaryl, alkylaryloxy, aryloxy, aralkyloxy, aralkylsulfonyl, aralkylamino, arylamino, arylazo, arylthio, or aralkylthio; or Z is formula (II) wherein U is C or N, and R7 and R8 are defined above; and X and Y are independently aryl, carbocycle, or heterocycle.
43 citations
TL;DR: In this paper, a sample of four million hadronic Z decays collected with the ALEPH detector at LEP are fully reconstructed and used to look for resonant structure in the Bπ system.
39 citations
TL;DR: In this paper, the production of final states involving one or more energetic photons from e+e− collisions is studied in a sample of 58.5 pb −1 of data recorded at a centre-of-mass energy of 183 GeV by the ALEPH detector at LEP.
31 citations
TL;DR: In this paper, the triple gauge-boson couplings, αWΦ, α W and αBΦ have been measured using 34 semileptonically and 54 hadronically decaying W+W− candidate events.
29 citations
TL;DR: In this paper, the authors show that an increase in the ratio of educational subsidies to income financed by flat-rate consumption and income taxes enhances economic growth, and has no net effect on fertility with logarithmic preferences.
29 citations
TL;DR: In this article, the final states with charged kaons in three-prong τ decays are studied by exploiting the particle identification from the dE/dx measurement, based on a sample of about 1.6 × 105 detected τ pairs collected with the ALEPH detector between 1991 and 1995 around the Z peak.
Abstract: Final states with charged kaons in three-prong τ decays are studied by exploiting the particle identification from the dE/dx measurement. The results are based on a sample of about 1.6 × 105 detected τ pairs collected with the ALEPH detector between 1991 and 1995 around the Z peak. The following branching ratios have been measured: B(τ- → K−K+π−ντ) = (1.63 ± 0.21 ± 0.17) × 10−3, B(τ− → K−π+π−ντ) = (2.14 ± 0.37 ± 0.29) × 10−3, B(τ− → K−K+π−π0ντ) = (0.75 ± 0.29 ± 0.15) × 10−3, and B(τ− → K−π+π−π0ντ) = (0.61 ± 0.39 ± 0.18) × 10−3. The first two measurements are more precise than the current world averages, while the last two channels are investigated for the first time. The 95% C.L. upper limit on the branching ratio for the decay τ− → K−K+K−ντ is 0.19 × 10−3. A study of intermediate states occurring in the K−K+π−ντ and K−π+π−ντ decays is also presented.
28 citations
TL;DR: In this paper, the ALEPH experiment at LEP at center-of-mass energies around 183 GeV is analyzed to search for sleptons, the partners of leptons in supersymmetric theories.
24 citations
TL;DR: In this article, a measurement of the fraction of hadronic Z decays in which a gluon splits into a b b pair, g b b, is presented using data collected by ALEPH from 1992 to 1995.
TL;DR: In this article, the ALEPH detector has been used to search for scalar top, scalar bottom and degenerate scalar quarks with data collected at LEP at s = 181-184 GeV.
TL;DR: In this article, the authors used the ALEPH detector at LEP to perform searches for supersymmetric particles in channels with one or more photons and missing energy, and the results were in good agreement with predictions based on the Standard Model, and were used to set upper limits on the cross sections for anomalous photon production.
TL;DR: The mass of the W boson was obtained from reconstructed invariant mass distributions in W-pair events in this paper, where the sample of W pairs was selected from 10.65~pb$^{-1}$ collected with the ALEPH detector at a mean centre-of-mass energy of 172.09 \GEV.
TL;DR: In this article, a study of events with photons and missing energy has been performed with the data sample obtained with the ALEPH detector at centre-of-mass energies from 161 to 184 GeV, corresponding to a total integrated luminosity of about 80 pb**-1.30
TL;DR: In this paper, a lower bound on the mass of the lightest ch is established for chargino and neutralino production at center-of-mass energies of 161, 170, and 172 GeV.
Abstract: The data recorded by the ALEPH detector at centre-of-mass energies of 161, 170, and 172 GeV are analysed for signals of chargino and neutralino production. No evidence of a signal is found, although candidate events consistent with the expectations from Standard Model processes are observed. Limits at 95% C.L. on the production cross sections are derived and bounds on the parameters of the Minimal Supersymmetric Standard Model are set. The lower limit on the mass of the lightest ch is 85.5 \({\mathrm{GeV}/c^{\mathrm 2}}\) for gaugino-like charginos (\(\mu = -500 {\mathrm{GeV}/c^{\mathrm 2}}\)), and 85.0 \({\mathrm{GeV}/c^{\mathrm 2}}\) for Higgsino-like charginos (\( M_{2} = 500 {\mathrm{GeV}/c^{\mathrm 2}}\)), for heavy sneutrinos (\(M_{\tilde
u} \geq 200 {\mathrm{GeV}/c^{\mathrm 2}}\)) and \({\tan\beta} = \sqrt{2}\). The effect of light sleptons on chargino and neutralino limits is investigated. The assumptions of a universal slepton mass and a universal gaugino mass are relaxed, allowing less model-dependent limits to be obtained.
TL;DR: In this paper, a sample of four million hadronic Z events collected in ALEPH from 1991 to 1995, the decays D ∗+ → D 0 π s +, with D0 decaying to K−π+ or to K+π−, are studied.
TL;DR: In this paper, the data collected at center-of-mass energies ranging from 130 to 172 GeV by ALEPH at LEP, corresponding to an integrated luminosity of 27.5 pb−1, are analysed in a search for pair-produced charged Higgs bosons H±.
TL;DR: In this paper, the data collected by ALEPH at LEP at center-of-mass energies ranging from 181 to 184 GeV, corresponding to an integrated luminosity of 57 pb(-1), are analysed to search for pair-produced neutral Higgs bosons h and A, in the b (b) over bar b(b, over bar and tau(+)tau(-)b (b), over bar final states.
TL;DR: In this article, the decays of ψ(2S) into vector plus tensor meson final states have been studied for the first time using the BES detector.
Abstract: Author(s): Bai, JZ; Bian, JG; Blum, I; Chai, ZW; Chen, GP; Chen, HF; Chen, J; Chen, JC; Chen, Y; Chen, YB; Chen, YQ; Cheng, BS; Cui, XZ; Ding, HL; Ding, LY; Dong, LY; Du, ZZ; Dunwoodie, W; Feng, S; Gao, CS; Gao, ML; Gao, SQ; Gratton, P; Gu, JH; Gu, SD; Gu, WX; Gu, YF; Guo, YN; Han, SW; Han, Y; Harris, FA; He, J; He, JT; He, M; Hitlin, DG; Hu, GY; Hu, HM; Hu, JL; Hu, QH; Hu, T; Hu, XQ; Huang, JD; Huang, YZ; Izen, JM; Jiang, CH; Jin, Y; Ke, ZJ; Kelsey, MH; Kim, BK; Kong, D; Lai, YF; Lang, PF; Lankford, A; Li, CG; Li, D; Li, HB; Li, J; Li, PQ; Li, RB; Li, W; Li, WD; Li, WG; Li, XH; Li, XN; Liu, HM; Liu, J; Liu, JH; Liu, RG; Liu, Y; Lou, XC; Lowery, B; Lu, F; Lu, JG; Lu, JY; Lu, LC; Luo, CH; Ma, AM; Ma, EC; Ma, JM; Malchow, R; Mao, HS; Mao, ZP; Meng, XC; Nie, J; Olsen, SL | Abstract: The decays of the ψ(2S) into vector plus tensor meson final states have been studied for the first time using the BES detector We determine upper limits on branching fractions for ψ(2S) decays into ωf2, ρa2, K*0K*02 + cc, and φf'2(1525) that are, in each case, significantly smaller than the corresponding branching fractions for the J/ψ meson, scaled according to the expectations of perturbative QCD © 1998 The American Physical Society
TL;DR: An improved measurement of the forward-backward asymmetry in Z → b b decays is presented, based on a sample of 4.1 million hadronic Z decays collected by ALEPH between 1991 and 1995 as discussed by the authors.
TL;DR: In this paper, a lower bound on the mass of the Higgs boson has been established: m H >87.9 GeV /c 2 at 95% confidence level.
Journal Article•
TL;DR: The down-regulation of renal PTH/PTHrP receptor mRNA occurs much earlier than the changes of renal function, plasma PTH, serum phosphorus and calcium in the course of human renal disease.
Abstract: OBJECTIVE To investigate whether the down-regulation of renal parathyroid hormone/parathyroid hormone related protein (PTH/PTHrP) receptor messenger ribonucleic acid (mRNA) expression is a general phenomenon in patients with different stages of renal disease, besides chronic renal failure. METHODS Twenty-five patients were divided into the following groups: (1) chronic glomerulonephritis with normal renal function (GNN) (2) chronic glomerulonephritis with moderate renal insufficiency (GNI) (3) severe chronic renal failure undergoing maintenance dialysis (CRF) (4) acute renal failure during oliguric phase (ARF) (5) normal control without renal suffering (NC). Using relatively quantitative reverse transcription/polymerase chain reaction (RT/PCR) method, we investigated PTH/PTHrP receptor mRNA expression in renal specimens obtained through biopsy or operation. The levels of plasma C-terminal PTH, serum phosphorus and calcium were also observed at the same time. RESULTS Plasma C-terminal PTH levels in GNI, CRF and ARF patients were 1.90, 9.73 and 8.63 times higher than those in NC. However, the difference between GNN and NC was insignificant. CRF and ARF patients also presented obviously elevated serum phosphorus (1.61, 1.86 vs 1.14 mmol/L) and reduced serum calcium (1.82, 1.71 vs 2.26 mmol/L) compared with that in the control. These two parameters for GNN and GNI patients were normal. The levels of PTH/PTHrP receptor mRNA (corrected by beta-actin mRNA) in the kidney of GNN, GNI, CRF and ARF patients was markedly decreased by up to 35.7%, 68.5%, 77.9% and 92.2%, respectively. CONCLUSIONS The down-regulation of renal PTH/PTHrP receptor mRNA occurs much earlier than the changes of renal function, plasma PTH, serum phosphorus and calcium in the course of human renal disease.
TL;DR: In this article, the four jet topology is analyzed in the ALEPH data taken between November 1995 and November 1997, at center-of-mass energies ranging from 130 to 184 GeV.
TL;DR: The characteristics of the fluorescence spectra of 2,5-bis(4-diethyl-aminophenyl)-1,3,4-oxadiazole(BDD) doped in Si-Ti binary oxides by the sol-gel method were investigated as a function of time in this article.
Abstract: The characteristics of the fluorescence spectra of 2,5-bis(4-diethyl-aminophenyl)-1,3,4-oxadiazole(BDD) doped in Si-Ti binary oxides by the sol-gel method were investigated as a function of time in...
Journal Article•
TL;DR: The injection of donor's splenic lymphocytes before transplantation could significantly prolong the survival time of the heterotopically transplanted heart and the combined use of the above-mentioned two methods acted on both the host and the donor, resulting in synergistic effect in inducing immune tolerance in adult rabbits, and resulting in relatively long-term survival of transplanted hearts.
Abstract: OBJECTIVE To induce experimental immune tolerance in rabbits and observe its effects on heterotopic cardiac transplantation. METHODS Donor's splenic lymphocytes pretreated with platinum metal chelator were injected into the recipient's mesenteric-portal vein. Cyclosporin A was perfused through the donor's heart. RESULTS The injection of donor's splenic lymphocytes before transplantation could significantly prolong the survival time of the heterotopically transplanted heart. The effect of two injections was better than that of one. Radioactive tracer studies showed that the 99mTc-HMPAO tagged lymphocytes injected into the recipient rabbit were later concentrated in the liver, though initially they were distributed in multiple organs. The induced immune tolerance was antigen-specific, and it neither affect the other immune functions of the lymphatic system prominently nor exert any harmful effect on the recipient's liver and renal functions. The perfusion of cyclosporin A through the donor heart could block the glycosyl groups, such as D-glucose, D-mannose or N-acetyl-galactosamine on the surface of the myocardial cells, thus might change the antigenic expression, effectively preventing rejection of the graft by the host, and might be considered as a new method to block graft rejection in cardiac transplantation. The combined use of the above-mentioned two methods acted on both the host and the donor, thus reducing the exposed antigens on the donor organ as well as the immune reaction against the donor antigens, and resulting in synergistic effect in inducing immune tolerance in adult rabbits, and resulting in relatively long-term survival of transplanted hearts. CONCLUSION This report may provide the experimental basis for inducing immune tolerance in clinical transplantation.
Patent•
02 Sep 1998
TL;DR: In this article, the authors define a set of atomes necessaires a la formation of a noyau condense, mono, bi ou tricyclique, carbocyclique ou heterocycliques, chaque nyau individuel possedant 5 a 6 chainons.
Abstract: L'invention concerne des composes, des compositions les contenant, des methodes d'utilisation de ceux-ci, et des procedes de fabrication de ces composes, d'un sel d'addition d'acide ou de base de ceux-ci, acceptable sur le plan pharmacologique, d'un ester, solvate, promedicament, metabolite, stereo-isomere ou de melanges de ces composes. Ceux-ci contiennent au moins un noyau azote et correspondent a la formule (I) dans laquelle X represente oxygene a liaison double, ou -OH, ou bien il represente hydrogene ou alkyle inferieur lorsque R7 est present, Y represente les atomes necessaires a la formation d'un noyau condense, mono, bi ou tricyclique, carbocyclique ou heterocyclique, chaque noyau individuel possedant des atomes a cycle pentagonal ou hexagonal, et Z represente (i) -CHR?2CHR3- ou R2 et R3? representent independamment hydrogene, alkyle, aryle ou aralkyle; (ii) -R?6C=CR3- ou R3 et R6? representent independamment hydrogene, alkyle inferieur, aryle, aralkyle, halo, -NO?2?, -COOR?7?, ou -NR?7R8 ou R8? represente independamment hydrogene ou alkyle C?1?-C9, ou bien R?6 et R3? pris ensemble forment un noyau aromatique condense, chaque noyau individuel possedant 5 a 6 chainons; (iii) -R2-C=N-; (iv) -CR?2(OH)-NR7?-, ou (v) -C(O)-NR7-.