排序方式: 共有40条查询结果,搜索用时 15 毫秒
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Bai JZ Bardon O Blum I Breakstone A Burnett T Chen GP Chen HF Chen J Chen SJ Chen SM Chen Y Chen YB Chen YQ Cheng BS Cowan RF Cui HC Cui XZ Ding HL Du ZZ Dunwoodie W Fan XL Fang J Fero M Gao CS Gao ML Gao SQ Gao WX Gratton P Gu JH Gu SD Gu WX Gu YF Guo YN Han SW Han Y Harris FA Hatanaka M He J He KR He M Hitlin DG Hu GY Hu HB Hu T Hu XQ Huang DQ Huang YZ Izen JM Jia QP Jiang CH Jin Y Jones L Kang SH Kelsey MH Kim BK Lai YF Lan HB Lang PF Lankford A Li F Li J Li PQ Li Q Li RB 《Physical review D: Particles and fields》1995,52(7):3781-3784
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Abe K Abt I Acton PD Agnew G Ash WW Aston D Bacchetta N Baird KG Baltay C Band HR Baranko G Bardon O Battiston R Bazarko AO Bean A Belcinski RJ Ben-David R Benvenuti AC Biasini M Bienz T Bilei GM Bisello D Blaylock G Bogart JR Bolton T Bower GR Brau JE Breidenbach M Bugg WM Burke D Burnett TH Burrows PN Busza W Calcaterra A Caldwell DO Calloway D Camanzi B Carpinelli M Carr J Cassell R Castaldi R Castro A Cavalli-Sforza M Chadwick GB Chen L Church E Claus R Cohn HO Coller JA Cook V Cotton R 《Physical review letters》1993,71(16):2528-2532
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Bai JZ Ban Y Bian JG Chen AD Chen HF Chen HS Chen JC Chen XD Chen YB Cheng BS Chi SP Chu YP Choi JB Cui XZ Dai YS Dong LY Du ZZ Dunwoodie W Fu HY Fu LP Gao CS Gu SD Guo YN Guo ZJ Han SW Han Y Harris FA He J He JT He KL He M He X Hong T Heng YK Hu GY Hu HM Hu QH Hu T Huang GS Huang XP Huang YZ Izen JM Ji XB Jiang CH Jin Y Jones BD Kang JS Ke ZJ Kim HJ Kim SK Kim TY Kong D Lai YF Li D Li HB Li HH Li J Li JC Li PQ Li QJ Li RY Li W Li WG Li XN Li XQ Liu B Liu F Liu F Liu HM Liu J Liu JP Liu TR 《Physical review letters》2002,88(10):101802
We report values of R = sigma(e(+)e(-)-->hadrons)/sigma(e(+)e(-)-->mu(+)mu(-)) for 85 center-of-mass energies between 2 and 5 GeV measured with the upgraded Beijing Spectrometer at the Beijing Electron-Positron Collider. 相似文献
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G.W. Brandenburg R.K. Carnegie R.J. Cashmore M. Davier W.M. Dunwoodie T.A. Lasinski D.W.G.S. Leith J.A.J. Matthews P. Walden S.H. Williams 《Physics letters. [Part B]》1975,59(4):405-408
The results of a wire chamber spectrometer experiment studying 1 (890) production in the reaction K?p→ K?π+n at 13 GeV are presented. Strong forward structure is observed for |t|< m2π in the s-channel density matrix elements and differential cross section. These features are similar to those observed in π?p→?0n data and are characteristics of π exchange. In contrast in the intermediate, |t| ~ 0.2 GeV2, and large momentum transfer regions 1 (890) production is demonstrated by the natural parity ??A2 exchange contribution. 相似文献
5.
The microscopic and macroscopic versions of fluid mechanics differ qualitatively. Microscopic particles obey time-reversible ordinary differential equations. The resulting particle trajectories {q(t)} may be time-averaged or ensemble-averaged so as to generate field quantities corresponding to macroscopic variables. On the other hand, the macroscopic continuum fields described by fluid mechanics follow irreversible partial differential equations. Smooth particle methods bridge the gap separating these two views of fluids by solving the macroscopic field equations with particle dynamics that resemble molecular dynamics. Recently, nonlinear dynamics have provided some useful tools for understanding the relationship between the microscopic and macroscopic points of view. Chaos and fractals play key roles in this new understanding. Non-equilibrium phase-space averages look very different from their equilibrium counterparts. Away from equilibrium the smooth phase-space distributions are replaced by fractional-dimensional singular distributions that exhibit time irreversibility. 相似文献
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P.V. Chliapnikov L.N. Gerdyukov O.G. Tchikilev A.P. Vorobjev G. Ciapetti W. Dunwoodie Y. Goldschmidt-Clermont A. Grant Z. Sekera A. Stergiou J. Tuominieni N. Yamdagni J.N. Carney D.C. Colley M. James G.T. Jones D. Sherbatt F. Grard D. Vignaud 《Physics letters. [Part B]》1975,55(2):237-240
The reaction K+p→Δ++(1236) + anything is studied at a beam momentum of 16.0 GeV/c. The total and topological cross sections for K+π? interactions are estimated by a Chew-Low extrapolation from threshold to the c.m. energy of 3.4 GeV by the maximum likelihood method. 相似文献
7.
Simultaneous production of K1o (892) and Δ++(1236) in the reaction K+p→K+π+π−p from 4.3 to 5.0 GeV/c
G. Dehm G. Göbel W. Wittek G. Wolf G. De Jongh S. Tavernier G. Charrière W. Dunwoodie A. Grant Y. Goldschmidt-Clermont V.P. Henri F. Muller J. Quinquard P. Cornet P. Dufour F. Grard R. Windmolders Chumin Fu 《Nuclear Physics B》1974,71(1):52-81
The reaction from a K+d experiment with the CERN 2 m bubble chamber at 4.6 GeV/c is compared with the reaction from a K+p experiment at the same energy. In addition, predictions of an absorption model, a Regge pole model and a quark model for the production and decay characteristics of the reaction are tested with the combined statistics of the K+d experiment and three K+p experiments between 4.3 and 5.0 GeV/c. 相似文献
8.
Warren WM. McGovern 《代数通讯》2013,41(4):1636-1646
The content of a polynomial f over a commutative ring R is the ideal c(f) of R generated by the coefficients of f. A commutative ring R is said to be Gaussian if c(fg) = c(f)c(g) for every polynomials f and g in R[X]. A number of authors have formulated necessary and sufficient conditions for R(X) (respectively, R?X?) to be semihereditary, have weak global dimension at most one, be arithmetical, or be Prüfer. An open question raised by Glaz is to formulate necessary and sufficient conditions that R(X) (respectively, R?X?) have the Gaussian property. We give a necessary and sufficient condition for the rings R(X) and R?X? in terms of the ring R in case the square of the nilradical of R is zero. 相似文献
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P.V. Chliapnikov L.N. Gerdyukov N.G. Minaev A.P. Vorobjev W. Dunwoodie Y. Goldschmidt-Clermont A. Grant Z. Sekera A. Stergiou J. Tuominiemi J.N. Carney D.C. Colley M. James G.T. Jones D. Sherratt F. Grard P. Herquet V. Henri M. Sene 《Physics letters. [Part B]》1974,52(3):375-380
The average charged particle multiplicity, 〈nch(MX2)〉, in the reaction K+p→KoX++ is studied as a function of the mass squared, MX2, of the recoil system X and also as a function of the Ko transverse momentum, pT, at incident momenta of 5.0, 8.2 and 16.0 GeV/c. The complete data samples yield distributions which are not independent of c.m. energy squared, s, They exhibit a linear dependence on log (MX2X/Mo2)[Mo2=1 GeV2] with a change in slope occurring for MX2≈s/2, and do not agree with the corresponding distributions of 〈nch〉 as a function of s for K+ p inelastic scattering. Sub-samples of the data for which Ko production via beam fragmentation, central production and target fragmentation are expected to be the dominant mechanisms show that, within error, the distribution of 〈nch(MX2)〉 versus MX2 is independent of incident momentum for each sub-sample separately. In particular in the beam fragmentation region the 〈nch(MX2)〉 versus MX2 distribution agrees rather well with that of 〈nch〉 versus s for inelastic K+p interactions. The latter result agrees with recent results on the reactions pp → pX and π?p → pX in the NAL energy range. Evidence is presented for the presence of different production mechanisms in these separate regions. 相似文献