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41.
A.L.S. Angelis H.-J. Besch B.J. Blumenfeld L. Camilleri T.J. Chapin R.L. Cool C. del Papa L. Di Lella Z. Dimčovski R.J. Hollebeek L.M. Lederman D.A. Levinthal J.T. Linnemann C.B. Newman N. Phinney B.G. Pope S.H. Pordes K.K. Young 《Nuclear Physics B》1982,209(2):284-300
We present data on proton-proton collisions, obtained at the CERN Intersecting Storage Rings, in which two roughly back-to-back π0's of high transverse momentum (pT) were produced. The angular distribution of the dipion axis relative to the collision axis is found to be independent of both the effective mass m of the dipion system and the centre-of-mass energy √s of the proton-proton collision. The cross-sections at the values of √s satisfy a scaling law of the form . We show from our data that the leading π0 carries most of the momentum of the scattered parton. Given this fact, the axis of the dipion system follows closely the direction of the scattered constituents, and we exploit this to determine the angular dependence of the hard-scattering subprocess. We also compare our data with the lowest order QCD predictions using structure functions as determined in deep-inelastic scattering and fragmentation functions from electron-positron annihilation. 相似文献
42.
F.W. Büsser L. Canilleri L. Di Lella B.G. Pope A.M. Smith B.J. Blumenfeld S.N. White A.F. Rothenberg S.L. Segler M.J. Tannenbaum M. Banner J.B. Chèze H. Kasha J.P. Pansart G. Smadja J. Teiger H. Zaccone A. Zylberstejn 《Nuclear Physics B》1976,113(2):189-245
Measurements of single-electron production in proton-proton collisions at the CERN ISR are presented for five centre-of-mass energies √s = 23.5, 30.6, 44.8, 52.7, and 62.4 GeV. The invariant cross sections for single electrons with transverse momenta of 0.60 to 4.7 GeV/c are given. Measurements of electron-positron pairs and measurements of charged hadrons produced in association with the single electrons, are also reported. 相似文献
43.
P. Granet L. Mosca J. Saudraix J.C. Scheuer D. Vilanova H. Blumenfeld V.P. Henri J. Kesteman J. Laurent R. Windmolders E. de Wolf S. Tavernier F. Verbeure I.V. Ajinenko P.V. Chliapnikov L.N. Gerdyukov P.A. Gorbunov A.M. Rybin 《Nuclear Physics B》1978,140(3):389-408
The inclusive production of resonances is systematically studied in K+p interactions at 32 GeV/c. Total production cross sections are given for three baryon resonances, five vector and three 2+ tensor mesons. We also compare the central and fragmentation components of the total production cross sections with quark model predictions. 相似文献
44.
Jean-Claude Barrire Jeanine Clophax Stephan D. Gro Marc Vuilhorgne 《Helvetica chimica acta》1983,66(1):296-307
The synthesis of a large variety of enantiomerically pure substituted reactive cyclopentenes 16, 23, 24 and 28 have been synthesized from the readily available (?)-quinic acid 1 . The straightforward strategy involves a high-yielding intramolecular aldolization-dehydration of acyclic 1,6-dialdehydes 13, 18, 19 and 27 obtained by oxidative cleavage of cyclohexanediols 5, 7, 11 and 12 , using either lead tetraacetate or triphenylbismuth carbonate. Neither sulfoxide formation nor racemization of the intermediate dialdehydes at the oxygenated chiral centre was observed. Transformation of the thioacetal 25 to the corresponding ketone 26 using phenylselenic anhydride is also described. 相似文献
45.
46.
J. Derre H. Blumenfeld M.A. Jabiol A. Leveque S. Otwinowski E. Pauli V.H. Bumazshnov P.F. Ermolov E.P. Kistenev V.I. Nicolaencko A.M. Moiseev E.H. Starchenko E.B. Vlasov J. Loskiewicz J. Quinquard A.M. Touchard H.H. Kaufmann J.S. Takibaev E.G. Boos 《Physics letters. [Part B]》1974,50(2):287-289
Correlations between two π? in pp interactions at 69 GeV/c are presented in terms of longitudinal and transversal variables. The dominant feature is the existence of a strong shortrange positive correlation between the two π? in the central region. 相似文献
47.
F.W. Büsser L. Camilleri L. Di Lella G.B. Pope A.M. Smith B.J. Blumenfeld S.N. White A.F. Rothenberg S.L. Segler M.J. Tannenbaum M. Banner J.B. Chèze H. Kasha J.P. Pansart G. Smadja J. Teiger H. Zaccone A. Zylberstejn 《Physics letters. [Part B]》1976,61(3):309-312
Transverse momentum distributions of , and Ko, produced in pp collisions at x = 0, have obtained at the CERN ISR. The Ko yield is in agreement with published K+, K? results, obtained at this centre-of-mass energy (√s≈44 GeV). The results on production obtained in this experiment are compared with results obtained at lower centre-of-mass energies. 相似文献
48.
The exponential perturbation approximation is tested in the semiclassical perturbed stationary states frame, using spline functions for interpolation of the non-adiabatic couplings. An application is realized for the p-H2 + 4He rotational cross sections. 相似文献
49.
R. Blumenfeld S. F. Edwards M. Schwartz 《The European physical journal. E, Soft matter》2010,32(4):333-338
We introduce and study a da Vinci fluid, a fluid whose dissipation is dominated by solid friction. We analyse the flow rheology
of a discrete model and then coarse-grain it to the continuum. We find that the model gives rise to behaviour that is characteristic
of dense granular fluids. In particular, it leads to plug flow. We analyse the nucleation mechanism of plugs and their development.
We find that plug boundaries generically expand and we calculate the growth rate of plug regions. In systems whose internal
effective dynamic and static friction coefficients are relatively uniform we find that the linear size of plug regions grows
as (time)1/3 . The suitability of the model to granular materials is discussed. 相似文献
50.
Abulencia A Adelman J Affolder T Akimoto T Albrow MG Ambrose D Amerio S Amidei D Anastassov A Anikeev K Annovi A Antos J Aoki M Apollinari G Arguin JF Arisawa T Artikov A Ashmanskas W Attal A Azfar F Azzi-Bacchetta P Azzurri P Bacchetta N Badgett W Barbaro-Galtieri A Barnes VE Barnett BA Baroiant S Bartsch V Bauer G Bedeschi F Behari S Belforte S Bellettini G Bellinger J Belloni A Benjamin D Beretvas A Beringer J Berry T Bhatti A Binkley M Bisello D Blair RE Blocker C Blumenfeld B Bocci A 《Physical review letters》2006,97(24):242003
We report the observation of Bs(0)-Bs(0) oscillations from a time-dependent measurement of the Bs(0)-Bs(0) oscillation frequency Deltams. Using a data sample of 1 fb(-1) of pp collisions at square root of s=1.96 TeV collected with the CDF II detector at the Fermilab Tevatron, we find signals of 5600 fully reconstructed hadronic Bs decays, 3100 partially reconstructed hadronic Bs decays, and 61,500 partially reconstructed semileptonic Bs decays. We measure the probability as a function of proper decay time that the Bs decays with the same, or opposite, flavor as the flavor at production, and we find a signal for Bs(0)-Bs(0) oscillations. The probability that random fluctuations could produce a comparable signal is 8 x 10(-8), which exceeds 5sigma significance. We measure Deltams=17.77 +/- 0.10(stat) +/- 0.07(syst) ps(-1) and extract /V(td)/V(ts)/=0.2060+/-0.0007(Deltams)(-0.0060)(+0.008)(Deltamd+theor). 相似文献