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81.
W. Bartel L. Becker D. Cords R. Felst K. Hagiwara D. Haidt H. Junge G. Knies H. Krehbiel P. Laurikainen R. Meinke B. Naroska J. Olsson D. Schmidt P. Steffen G. Dietrich J. Hagemann S. Yamada 《Physics letters. [Part B]》1985,155(4):288-294
A search was performed for the associated production of two different Higgs bosons via a virtual Z0 in e+e? annihilation (e+e? → h10h20) using the JADE detector at PETRA. This was motivated by the interpretation of the monojet events observed at the CERN p collider as anomalous Z0 decays into two neutral Higgs bosons (h10 and h20), where h10 is stable and escapes detection while h20 decays into hadrons. Single- or di-jet events with large momentum imbalance are then expected at PETRA energies. No evidence for such events was found in our data; this excludes h20 masses in the range of 1 to 21 GeV with 95% CL, if the branching fraction for Z0 → h10h20 is a larger than one half that for . The possibility that the monojets could originate from supersymmetric higgsino production from Z0 decay is also examined. 相似文献
82.
S. Ahmad C. Amsler R. Armenteros E.G. Auld D. Axen D. Bailey S. Barlag G.A. Beer J.C. Bizot M. Caria M. Comyn W. Dahme B. Delcourt M. Doser K.D. Duch K.L. Erdman F. Feld-Dahme M. Ziegler 《Physics letters. [Part B]》1985,157(4):333-339
K and L series X-rays have been observed from p atoms formed in hydrogen gas at NTP in association with annihilations into neutral particles. The total K X-ray yield is (6.5 ± 3.2) × 10?3 per stopped antiproton. A model-dependent fit of the K X-ray spectrum gives a Kα energy of 8.9±0.3 keV, corresponding to a strong interaction shift of (?0.5±0.3) keV. 相似文献
83.
84.
W. Bartel L. Becker C. Bowdery D. Cords R. Felst D. Haidt J. Huttunen H. Junge G. Knies H. Krehbiel P. Laurikainen R. Meinke B. Naroska J. Olsson E. Pietarinen D. Schmidt P. Steffen S. Yamada 《Physics letters. [Part B]》1984,139(4):327-331
We have searched for the supersymmetric partner of the photon, the photino, by investigating two-photon and single photon final states in e+e? collisions. No significant signals were observed, which excludes the existence of the photino in the mass range 0.08–18 GeV/c2 at the 95% confidence level, subject to the assumptions d=(100 GeV)2 and , where d is the supersymmetry breaking scale parameter and is the scalar electron mass. 相似文献
85.
We have calculated the rates for ?(1S,2S) → scalar or pseudoscalar +γ, including upsilon wavefunction effects. For a scalar we find that bound state effects reduce B(25)/B(1S) by 20–30%. For a pseudoscalar these effects enhance B(2S)/B(1S) by 5%. 相似文献
86.
G.J. Alner K. Alpgård R.E. Ansorge B. Åsman K. Böckmann C.N. Booth L. Burow P. Carlson J.-L. Chevalley C. DeClercq R.S. DeWolf B. Eckart G. Ekspong I. Evangelou A. Eyring J.-P. Fabre K.A. French N. Yamdagni 《Physics letters. [Part B]》1984,138(4):304-310
New data are presented on the charged multiplicity distribution for non single-diffractive events produced in pp? interactions at a CM energy . The distribution in the full pseudorapidity range is compared with data from the ISR. Using the scaling variable a change of shape is observed. The effect is manifested as an increase from 2% to 6% in the proportion of high multiplicity (z > 2) events. For the central pseudorapidity range, |η| ? 1.5, scaling is approximately valid up to . 相似文献
87.
W. Bartel L. Becker D. Cords R. Felst D. Haidt H. Junge G. Knies H. Krehbiel P. Laurikainen K. Meier R. Meinke B. Naroska J. Olsson D. Schmidt P. Steffen G. Dietrich J. Hagemann S. Yamada 《Physics letters. [Part B]》1985,157(4):340-344
Distributions of particles in three-jet events from e+e? → hadrons are compared with different fragmentation schemes, i.e. the Lund string model, independent parton fragmentation and QCD shower models. Effects specific to the string scheme, which have been seen in the data, are also reproduced by QCD shower models if soft gluon interference effects are included. 相似文献
88.
L.R. Cormell M.W. Arenton H.F. Chen M. Corcoran W.R. Ditzler M. Dris A.R. Erwin T. Fields J. Fleischman E. Gardella M. Harrison M.A. Hasan K. Johns A. Kanofsky W. Kononenko C.E. Kuehn H.E. Miettinen B.T. Yost 《Physics letters. [Part B]》1985,150(4):322-326
In an experiment performed at Fermilab we have studied the production of high pt hadron jets from 400 GeV/c pp interactions. A large solid-angle, towered calorimeter was used to trigger and reconstruct the jet events. We report results for inclusive single-jet production and compare those results with QCD predictions and results obtained at the ISR and the SPS Collider. 相似文献
89.
T.A Armstrong M Baubillier J.C Brient J.Dias de Deus J.M Gago J Kahane D Perrin M Pimenta M Sené R Sené P Sonderegger Z Strachman R Zitoun 《Nuclear Physics B》1985,262(2):356-364
Results on Λ polarization in the inclusive reaction K?p→Λ + X at 12 and 16 GeV/c for 0.6<x<1.0, are presented. These results, obtained with the CERN Omega Spectrometer, show that the polarization is important at large x and increases with pt over the covered range 0<pt<1.2 GeV/c. The average polarization for 31 857 lambdas with x>0.6 is PΛ = 0.35 ± 0.02, along the direction . The polarization can be expressed as P(x, pt) = (0.66±0.03)pt independent of x in the range covered by the experiment. 相似文献
90.
B. Nunnally S. S. Park K. Patel M. Hong X. Zhang S. -X. Wang B. Rener A. Reed-Bogan O. Salas-Solano W. Lau M. Girard H. Carnegie V. Garcia-Cañas K. C. Cheng M. Zeng M. Ruesch R. Frazier C. Jochheim K. Natarajan K. Jessop M. Saeed F. Moffatt S. Madren S. Thiam K. Altria 《Chromatographia》2006,64(5-6):359-368
An international project team (including members from US, Canada and UK) has been formed from a number of interested biopharmaceutical companies and regulatory authorities to conduct a cross-organisation collaboration exercise. The results from this exercise demonstrate the robustness of CE-SDS across eight different organisations that used instruments of the same equipment model, the same reagents, and the same methodology. Data generated from the analysis of a series of molecular weight markers showed very good precision with regards to relative migration time (RMT) both within and between organisations. The apparent molecular weight of bovine serum albumin (BSA) was measured with good precision to within approximately 2% RSD across the participants. A representative IgG sample showed similar results with regards to relative migration time of its 3 main components, IgG Light Chain, IgG Non-glycosylated Heavy Chain, and IgG Heavy Chain. Fractional peak area for each peak also showed good agreement, with less than 9% RSD for all peaks. This exercise will facilitate both increased regulatory and industrial opinion of CE for biopharmaceutical analysis.CE in the Biotechnology & Pharmaceutical Industries: 7th Symposium on the Practical Applications for the Analysis of Proteins, Nucleotides and Small Molecules, Montreal, Canada, August 12–16, 2005 相似文献