共查询到20条相似文献,搜索用时 31 毫秒
1.
W.D. Apel K.H. Augenstein M. Krüger H. Müller H. Schneider E. Bertolucci I. Mannelli G.M. Pierazzini M. Quaglia A. Scribano F. Sergiampetri M.L. Vincelli S.V. Donskov A.V. Inyakin V.A. Kachanov R.N. Krasnokutsky Yu.V. Mikhailov Yu.D. Prokoshkin G. Sigurdsson 《Physics letters. [Part B]》1977,72(1):132-134
New results on a high statistics measurement of pion-nucleon charge exchange scattering at 40 GeV/c, extending in momentum transfer up to ?t = 1.8 (GeV/c)2, are reported and compared with an optical impact parameter model, together with previous data for the reaction π?p → ηn at the same energy. The imaginary part of the pole trajectory b0(s) is determined from the slope of the tangent to the maxima of . The linear increase of Im b0(s) with log s, which has been observed at low energies, continues up to 40 GeV/c. 相似文献
2.
H. Braun A. Fridman E. Jegham P. Juillot J.A. Malko C. Voltolini G.R. Charlton W.A. Cooper B. Musgrave 《Nuclear Physics B》1973,54(1):61-77
Based on 150 000 photographs taken at the ZGS with the 30 inch deuterium-filled chamber we present an analysis of the elastic d scattering reaction. Due to unrecoreded small deuteron recoils we were only able to measure the elastic cross section in the four-momentum region |t| > 0.03 (GeV/c)2. Extrapolation towards small |t| by two different methods gave us two compatible estimates of the total elastic cross section. The differential cross section was analyzed by means of the Glauber formalism both with and without the effects due to the D-wave part of the deuteron wave function. The differential cross sections of np at 5.4 GeV/c and deduced from our data were compared and exhibit a crossover phenomenon. 相似文献
3.
D.E. Caro E. Gold A.G. Klein C.E. MacDowell G.I. Opat J.W.G. Wignall 《Nuclear Physics B》1973,52(1):239-247
We present differential cross sections for elastic d scattering at beam momenta 0.735 and 0.940 GeV/c and momentum transfers in the range 0.04<|t|<0.5(GeV/c)2. The d elastic differential cross section is expressed in terms of a deutron form factor and the I=0 t-channel exchange N amplitudes, enabling us to isolate the corresponding I=0 t-channel exchange cross sections. 相似文献
4.
Seiichi Wakaizumi 《Physics letters. [Part B]》1982,113(3):275-278
The pronounced dip-bump structure with a sharp minimum at |t| = 1.5 (GeV/c)2, recently observed in elastic p scattering at PL = 50 GeV/c at the CERN SPS, is explained by the quark multiple scattering model with a realistic wavefunction for the proton and the antiproton. It is predicted that a second dip will appear around |t| = 7 (GeV/c)2 at PL = 50 GeV/ c and at higher energies. 相似文献
5.
A. Berglund T. Buran P.J. Carlson C.J.S. Damerell I. Endo A.R. Gillman V. Gracco R.J. Homer M.J. Hotchkiss A. Lundby M. Macri B.N. Ratcliff A. Santroni T. Tso F. Wickens J.A. Wilson 《Nuclear Physics B》1978,137(3):276-282
The reaction has been studied at 10.1 GeV/c in the ?t interval from 0.15 to 1.5 (GeV/c)2. A line-reversal comparison with backward elastic scattering π+p → pπ+ shows good agreement for ?t > 0.3 (GeV/c)2. 相似文献
6.
The amplitudes from a multichannel analysis of two-body data on in the region below 2 GeV are presented, and compared with those obtained in other recent analyses. Implications for the process KLP → KSP, and the predictions of fixed-t dispersion relations for K?p scattering, are also examined. 相似文献
7.
Recent phase-shift solutions are used to evaluate KN FESR integrals in order to examine zeros and phases of the t-channel exchange amplitudes in the most model-independent way. The results suggest that the line reversal breaking in KN CEX observed for pL ? 5.5 GeV/c is due to a large EXD breaking component in the A2 exchange flip amplitude. The ? exchange flip amplitude is well described by a Regge pole amplitude with NWSZ at ?t ≈ 0.5 (GeV/c)2. The imaginary parts of ? and ω exchange non-flip amplitudes are both peripheral. 相似文献
8.
A. Berglund T. Buran P.J. Carlson C.J.S. Damerell I. Endo A.R. Gillman V. Gracco R.J. Homer M.J. Hotchkiss A. Lundby M. Macri B.N. Ratcliff A. Santroni T. Tso F. Wickens J.A. Wilson 《Nuclear Physics B》1980,176(2):346-354
The differential cross sections for K?p and p elastic scattering have been measured over the range of four-momentum transfer squared 0.18<?t<3.3 (GeV/c)2. The K?p data decrease smoothly as a function of ?t, whereas, the data shows a break at ?t = 0.6 (GeV/c)2 followed by a fast drop to ?t ? 1.6 (GeV/c)2 where the differential cross section levels off and stays constant out to ?t = 3 (GeV/c)2. 相似文献
9.
10.
P.V. Chliapnikov P.A. Gorbunov S.A. Gumenyuk V.V. Kniazev B.A. Manyukov V.M. Perevoztchikov V.N. Riadovikov V.A. Uvarov M.L. Faccini-Turluer M. Loret L. Mosca H. Blumenfeld J. Laberrigue C. Dujardin F. Grard J. Skura R. Windmolders M. Csejthey-Barth M. Gysen 《Nuclear Physics B》1977,131(1):93-106
A study of the inclusive and semi-inclusive Λ and production in K+p interactions at 32 GeV/c is presented. The inclusive cross sections for Λ and amount to 0.78 ± 0.05 and 0.42 ± 0.04 mb thus showing a remarkable growth between 16 and 32 GeV/c with a factor of 1.7 for Λ and 2.8 for . Target and beam fragmentation processes are found to be dominant for Λ and production respectively with the following lower limits for the corresponding cross sections: and . Although the early scaling conditions are fulfilled for the Λ production in the target fragmentation region, and production in the beam fragmentation region, scaling is not observed between 16 and 32 GeV/c in the x and pT2 Feynman variables. The Λ production is found to be very similar in the K+p inclusive reaction at 32 GeV/c and in the semi-inclusive reaction at the same energy. The pair production cross section increases significantly in K+p interactions from 16 to 32 GeV/c where it reaches the value . The cross sections for Λ or produced in association with an identified proton are also given and discussed. 相似文献
11.
R. Stenbacka G. Ekspong S.O. Holmgren S. Nilsson Ch. Walck P. Gregory P. Mason H. Muirhead G. Warren 《Nuclear Physics B》1978,135(1):20-44
Single-pion production in interactions at 9.1 GeV/c is analysed and cross sections are given. The plab dependence of the isospin amplitudes is determined by a fit to the world data. The data are also compared with the predictions of a reggeized Deck model. The results and the amplitudes are compared with the results at other energies and with the corresponding NπN amplitudes. 相似文献
12.
We apply our microscopic model for the topological cross section σn to produce n charged particles in hadron-proton interactions to hadron-nucleus scattering. The model is based on a stochastic branching process for hadronization. We calculate multiplicity distributions of hadron-nucleus collisions for 50 GeV ? EL ? 400 GeV based on a multiple collision model. The production of “grey” particles is considered together with the shower particles in order to test the model for higher number of collisions. The joint probability distribution of numbers of shower and grey particles F(ns, ng) is calculated. Finally, we critically compare the results to experimental data. 相似文献
13.
L. Satta J. Duflo F. Plouin P. Picozza L. Goldzahl J. Banaigs R. Frascaria F.L. Fabbri A. Codino J. Berger M. Boivin P. Berthet 《Physics letters. [Part B]》1984,139(4):263-266
Elastic scattering differential cross sections of α particles have been measured at Pα=7.0 GeV/c () on 1H, 2H, 3He and 4He target up to a momentum transfer of ~4 (GeV/c)2. A preliminary interpretation of the data is given in the framework of the Glauber theory. 相似文献
14.
K. Abe R.C. Fernow T.A. Mulera K.M. Terwilliger W. De Boer A.D. Krisch H.E. Miettinen J.R. OFallon L.G. Ratner 《Physics letters. [Part B]》1976,63(2):239-244
The elastic cross section for proton proton scattering at 11.75 GeV/c was measured at the Argonne ZGS using a 50% polarized target. In the range p⊥2=0.6 → 2.2 (GeV/c)2 we obtained precise measurements of for the ? ?, and ? initial spin states perpendicular to the scattering plane. We confirmed that the asymmetry parameter, A, decreases with energy in the diffraction peak, but is approximately energy-independent at large p⊥2. We found that the spin correlation parameter cnn acquires rather dramatic structure, and at large p⊥2 seems to grow with energy. 相似文献
15.
J. Badier J. Boucrot G. Burgun O. Callot Ph. Charpentier M. Crozon D. Décamp P. Delpierre B. Gandois R. Hagelberg M. Hansroul W. Kienzle P. Le Dû J. Lefrançois Th. Leray G. Matthiae A. Michelini Ph. Miné S. Weisz 《Physics letters. [Part B]》1979,89(1):145-150
We have measured the absolute cross section for dimuon production in hadron collisions at 200 GeV/c in the continuum region M = 4–8.5 GeV. In all the channels studied (pN, N, π±N and π?H2) the experimental cross section is significantly larger by a factor of 2.3 ± 0.5 than expected from the Drell-Yan model. Furthermore, our proton-nucleon data allow a determination of the nucleon valence structure function which agrees with the deep inelastic lepton scattering data. 相似文献
16.
S.J. Watts D.V. Bugg A.A. Carter M. Coupland E. Eisenhandler W.R. Gibson P.I.P. Kalmus H. Sandhu A. Astbury G.H. Grayer A.W. Robertson T.P. Shah C. Sutton 《Physics letters. [Part B]》1980,95(2):323-326
The polarization parameter for K+n charge exchange scattering has been measured at five momenta between 0.851 GeV/c and 1.351 GeV/c for centre of mass angles . Results from a phase shift analysis incorporating these results are presented. No Z1 resonances are observed. 相似文献
17.
C. Bruneton J. Bystricky G. Cozzika J. Deregel A. Derevschikov Y. Ducros A. Gaidot Yu. Kazarinov M. Kazarinov V. Kanavets B. Khatchaturov F. Lehar A. De Lesquen Yu. Matulenko J.P. Merlo A. Mecshanin S. Miyazhita J. Movchet V. Solovyanov 《Physics letters. [Part B]》1973,44(5):471-473
We report our first measurements of the polarization in the elastic scattering of negative pions from polarized protons at an incident pion momentum of 40 GeV/c. The momentum-transfer region covered was 0.08 < |t| < 1.3 (GeV/c)2. The angular distribution of the polarization exhibits a first minimum of ~ ? 5% and the well-known zero around t ≈ ? 0.6 (GeV/c)2. The energy variation of the first minimum (at around t = ? 0.2) may be expressed in a simple form, . 相似文献
18.
We present new data on the reaction K+d → K+π?p(p), at 5.44 GeV/c. This reaction is dominated by absorbed pion exchange and we have used the data to study K+π? scattering between 0.7 and 2 GeV/c2. We find the s-wave Kπ phase shift increases approximately linearly with mass up to 1.45 GeV/c2, and have evidence for a more rapid variation of the s-wave amplitude in the region of 1.5 GeV/c2. The so-called “up” branches in the region of the K1(890) and K1(1400) are excluded, save for the possibility of narrow s-wave resonances of width <10 MeV/c2. We have explained quantitatively every aspect of the data up to 2 GeV/c2 with s-, p-, d- and f-waves, finding an f-wave resonance at a mass of ≈1.76 GeV/c2 and with a width ≈300 MeV/c2. We have obtained new resonance parameters for the K1(1400) which differ substantially from the currently accepted values. 相似文献
19.
We have evaluated the s-channel-helicity partial-wave amplitudes for scattering as functions of the impact parameter using partial-wave data in the energy range PL≈1.0–2.0 GeV/c. We find that the background and resonance amplitudes exhibit features consistent with the dual absorptive picture for pomeron and f + ω and A2 + ? exchanges. Comparison of the πN low-energy amplitude with the partial-wave decomposition of a quantitative Regge model gives evidence for local duality between the s-channel resonance and t- and u-channel Regge exchanges. 相似文献
20.
A.D. Martin E.N. Ozmutlu R. Baldi T. Böhringer P.A. Dorsaz V. Hungerbühler M.N. Kienzle-Focacci M. Martin A. Mermoud C. Nef P. Siegrist 《Nuclear Physics B》1978,140(1):158-178
We present the results and the analysis of a high-statistics experiment to study A2 and g production in the reaction π?p→K?KS0p at 10 GeV/c. In each resonance region we perform a moment analysis of the data, and from the moments we determine the production amplitudes as a function of t. We find A2 production proceeds dominantly by natural-parity (pomeron and f) exchange. We compare A2 and diffractive K1 (1420) production. We find g production proceeds by π and ω exchanges; we determine the branching ratio. 相似文献