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151.
OPAL Collaboration K. Ackerstaff et al. 《The European Physical Journal C - Particles and Fields》1998,5(1):19-40
A search is described for the neutral Higgs bosons and predicted by models with two scalar field doublets and, in particular, the Minimal Supersymmetric Standard Model (MSSM).
The search in the and production channels is based on data corresponding to an integrated luminosity of 25 pb from collisions at centre-of-mass energies between 130 and 172 GeV collected with the OPAL detector at LEP. The observation of
a number of candidates consistent with Standard Model background expectations is used in combination with earlier results
from data collected at the resonance to set limits on and in general models with two scalar field doublets and in the MSSM. For example, in the MSSM, for , minimal and maximal scalar top quark mixing and soft SUSY-breaking masses of 1 TeV, the 95% confidence level limits GeV and GeV are obtained. For the first time, the MSSM parameter space is explored in a detailed scan.
Received: 20 February 1998 / Published online: 13 July 1998 相似文献
152.
153.
154.
A. A. Minaenko T. M. Bryukhanova N. A. Kruglov A. M. Moiseev E. A. Starchenko M. N. Ukhanov R. Barloutaud C. Cochet A. Givernaud C. Lewin M. L. Turluer U. Gensch H. J. Grabosch W. Lohmann J. MacNaughton F. Mandl France Collaboration Soviet Union CERN Collaboration Soviet Union Collaboration 《Zeitschrift fur Physik C Particles and Fields》1984,26(1):27-35
The inclusive production of γ's and πp0's inK ? p-interactions at 32 GeV/c is studied. About 30.000 γ's coming from a Mirabelle bubble chamber experiment with a sensitivity of 6.5 ev/μb have been used for the analysis. Inclusive and topological cross sections of γ's are measured. The γ invariant differential distributions and their scaling properties are investigated. The inclusive cross section of πp0-production is determined and the πp0 invariant differential distributions are evaluated and compared to those of πp±. 相似文献
155.
H. J. Grabosch H. H. Kaufmann R. Nahnhauer S. Nowak S. Schlenstedt V. V. Ammosov D. S. Baranov V. I. Hleborad A. A. Ivanilov P. V. Ivanov V. I. Konyushko V. M. Korablev V. A. Korotkov V. V. Makeev A. G. Myagkov N. A. Netyaga A. Yu. Polyarush A. A. Sokolov SKAT Collaboration 《Zeitschrift fur Physik C Particles and Fields》1989,41(4):527-531
All six exclusive single pion production processes from neutrino and antineutrino charged current interactions are studied in the energy range between 3 and 30 GeV. Using a quark model for single pion production from Rein and Sehgal we fitted the aximal mass parameter from total cross sections and compare the results with values from other experiments and the world-averages. 相似文献
156.
M. J. G. Borge P. G. Hansen B. Jonson S. Mattsson G. Nyman A. Richter K. Riisager ISOLDE Collaboration 《Zeitschrift für Physik A Hadrons and Nuclei》1989,332(4):413-417
The proton-rich isotopes32Ar-35Ar represent the first sequence for which the superallowed Gamow-Teller strength is known out toZ? N=4. The results are compared with two sets of predictions from large shell-model calculations, which give systematically different quenching factors, on the average 0.54 and 0.89. Possible reasons for this are discussed. A comparison is also made with the Gamow-Teller strength of proton-rich isotopes of neighbouring elements. 相似文献
157.
We analyse the proton electromagnetic form factor ratioR(Q 2 ) =QF 2 (Q 2 )/F 1 (Q 2 ) as a function of momentum transferQ 2 within perturbative QCD. We find that the prediction for (R(Q 2 ) at large momentum transferQ depends on the exclusive quark wave functions, which are unknown. For a wide range of wave functions we find thatQF 2 F 1 ~ const. at large momentum transfer, which is in agreement with recent JLAB data. 相似文献
158.
Searches for H Z production with the Higgs boson decaying into an invisible final state were performed using the data collected by the DELPHI experiment at centre-of-mass energies between 188 GeV and 209 GeV. Both hadronic and leptonic final states of the Z boson were analysed. In addition to the search for a heavy Higgs boson, a dedicated search for a light Higgs boson down to 40 GeV/c2 was performed. No signal was found. Assuming the Standard Model HZ production cross-section, the mass limit for invisibly decaying Higgs bosons is 112.1 GeV/c2 at 95% confidence level. An interpretation in the Minimal Supersymmetric extension of the Standard Model (MSSM) and in a Majoron model is also given.Received: 2 September 2003, Revised: 10 November 2003, Published online: 15 January 2004 相似文献
159.
Charged-particle multiplicity at mid-rapidity in Au-Au collisions at relativistic heavy-ion collider
The particle density at mid-rapidity is an essential global variable for the characterization of nuclear collisions at ultra-relativistic
energies. It provides information about the initial conditions and energy density reached in these collisions. The pseudorapidity
densities of charged particles at mid-rapidity in AuAu collisions at √s
NN = 130 and 200 GeV at RHIC (relativistic heavy ion collider) have been measured with the PHENIX detector. The measurements
were performed using sets of wire-chambers with pad readout in the two central PHENIX tracking arms. Each arm covers one quarter
of the azimuth in the pseudorapidity interval |η| < 035. Data is presented and compared with results from proton-proton collisions
and nucleus-nucleus collisions at lower energies. Extrapolations to LHC energies are discussed. 相似文献
160.
J. L. Bailly S. Banerjee F. Bruyant B. Buschbeck C. Caso H. Dibon B. Epp A. Ferrando F. Fontanelli T. Gemesy A. Gurtu R. Hamatsu Ph. Herquet T. Hirose J. Hrubec Yu. Ivanysherkov E. P. Kistenev N. Khalatyan S. Kitamura T. Kreuzberger V. Kubik P. Lipa P. K. Malhotra M. Markytan I. S. Mittra L. Montanet G. Neuhofer G. Pinter P. Porth R. Raghavan T. Rodrigo J. B. Singh S. Squarcia U. Trevisan K. Takahashi L. A. tikhonova T. Yamagata G. Zholobov J. Zoll S. A. Zotkin NA EHS - RCBC Collaboration 《Zeitschrift fur Physik C Particles and Fields》1988,40(1):13-24
Two particle correlations of hadrons produced in 360 GeV/cpp interactions are investigated in the transverse plane and in rapidity. The data were obtained at the European hybrid spectrometer equipped with a rapid cycling bubble chamber. The observed transverse and rapidity correlations are compared with the one string LUND-and a two string dual parton-model. These models predict in general stronger correlations in the transverse plane and much weaker correlations in rapidity than found in the data. The LUND-FRITIOF-and multichain dual parton models provide a better reproduction of the data, although the agreement is not yet satisfactory. Only the UA5 cluster model GENCL shows agreement with the data. 相似文献