排序方式: 共有19条查询结果,搜索用时 15 毫秒
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J. Bailey K. Borer F. Combley H. Drumm F.J.M. Farley J.H. Field W. Flegel P.M. Hattersley F. Krienen F. Lange E. Picasso W. Von Rüden 《Physics letters. [Part B]》1977,67(2):225-230
The anomalous g-factor a ≡ (g?2)/2 has been measured for muons of both charges in the Muon Storage Ring at CERN. The two results, aμ+ = 1165910(12) × 10?9 and aμ? = 1165936(12) × 10?9, are in good agreement with each other, and combine to give a mean aμ = 1165922(9) × 10?9, which is very close to the most recent theoretical prediction 1165921(10) × 10?9. For the experimental results, the total statistical and systematic error is given. The measurements thus confirm the remarkable QED calculation plus hadronic contribution, and serve as a precise verification of the CPT theorem for muons. 相似文献
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J.J. Aubert G. Bassompierre K.H. Becks C. Best E. B?hm X. de Bouard F.W. Brasse C. Broll S. Brown J. Carr R.W. Clifft J.H. Cobb G. Coignet F. Combley G.R. Court G. DAgostini W.D. Dau S.J. Wimpenny 《Physics letters. [Part B]》1983,133(6):461-466
A search was made at the CERN SPS for long-lived fractionally charged particles produced in deep inelastic muon interactions on a Be target using the existing muon beam line as a spectrometer. No such particles were found, leading to upper limits for the production cross section of the order of 10?36 cm2 for 200 GeV incident muon momentum and quark masses below 9 GeV for the charge and 15 GeV for charge. 相似文献
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J.J. Aubert G. Bassompierre K.H. Becks C. Best E. Böhm F.W. Brasse C. Broll J. Carr R.W. Clifft J.H. Cobb G. Coignet F. Combley G.R. Court J.M. Crespo P.F. Dalpiaz P. Dalpiaz W.D. Dau S.J. Wimpenny 《Physics letters. [Part B]》1980,94(1):101-105
In 280 GeV μ+ iron interactions the inelastic production of muon pairs has been observed in excess of QED processes. For energies greater than 20 GeV deposited in the target calorimeter the interactions are found to be mainly hadronic. Cross sections are presented for this process in the mass range 1?2.5 GeV/c2 and in the kinematic regions covered by the apparatus acceptance. The data are in good agreement with a photon-gluon fusion model for charmed particle production. 相似文献
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P.J. Bussey C. Raine J.G. Rutherglen P.S.L. Booth L.J. Carroll P.R. Daniel C.J. Hardwick J.R. Holt J.N. Jackson J.H. Norem W.H. Range F.H. Combley W. Galbraith V.H. Rajaratnam C. Sutton M.C. Thorne P. Waller 《Nuclear Physics B》1976,104(2):253-276
An experiment has been completed at the Daresbury synchrotron to measure the asymmetry in the photoproduction cross section of neutral pions on hydrogen, for photons polarised normal to and in the production plane. The source of polarised photons was coherent bremsstrahlung of electrons traversing the lattice structure of diamond and the polarisation P of the γ beam was calculated from the measured intensity of the coherent spike. The asymmetry parameter Σ, defined as Σ = (σ⊥ ? σ|)/(σ⊥ + σ|) where σ⊥(σ|) are the cross sections for photons polarised perpendicular (parallel) to the production plane, has been measured over a range of photon energies from 1.2 to 2.8 GeV and over a range of ?t (the square of the four-momentum transfer) from 0.13 (GeV/c)2 to 1.4 (GeV/c)2. A marked energy variation in the value of Σ is found over the energy region 1.6–1.8 GeV. 相似文献
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P.J. Bussey C. Raine J.G. Rutherglen P.S.L. Booth L.J. Carroll G.R. Court P.R. Daniel A.W. Edwards R. Gamet C.J. Hardwick P.J. Hayman J.R. Holt J.N. Jackson J.H. Norem W.H. Range F.H. Combley W. Galbraith V.H. Rajaratnam C. Sutton 《Nuclear Physics B》1979,154(2):205-225
Measurements have been made of the polarisation parameters Σ, T and P for the process γp → π+n in the photon energy range 520–2250 MeV at c.m. angles between 30° and 120°. These data were obtained in a double polarisation experiment, using the polarised photon beam from the Daresbury electron synchrotron incident on a polarised proton target. The data are compared with predictions from current theoretical analyses. 相似文献
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J.J. Aubert G. Bassompierre K.H. Becks C. Benchouk C. Best E. B?hm X. de Bouard F.W. Brasse C. Broll S. Brown J. Carr R.W. Clifft J.H. Cobb G. Coignet F. Combley G.R. Court G. DAgostini S.J. Wimpenny 《Physics letters. [Part B]》1983,133(5):370-374
Inclusive ?0 meson production has been measured in 120 GeV and 280 GeV muon-proton interactions. Distributions of z and pT2 are presented. Primary ?0 production is found to be equal to that of π0 production within errors. 相似文献
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A. Arvidson J.J. Aubert G. Bassompierre K.H. Becks C. Benchouk C. Best E. Böhm X. de Bouard F.W. Brasse C. Broll S. Brown J. Carr R.W. Clifft J.H. Cobb G. Coignet F. Combley G.R. Court S.J. Wimpenny 《Nuclear Physics B》1984,246(3):381-407
The measurements of the z and pT2 distribution of hadrons produced in the interactions of 200 GeV muons with copper and carbon nuclei are shown in different xBj and virtual photon energy intervals. Effects of the jet scattering are seen at the lowest virtual photon energies while for energies above 70 GeV there is no evidence of these effects. Comparison with a theoretical model indicates that at high jet energies the parton fragmentation distance is greater than the nuclear radius and that the parton absorption cross section is less than 10 mb. 相似文献