共查询到20条相似文献,搜索用时 62 毫秒
1.
D.A. Garbutt R.W. Rusack Ion Siotis D. Gross D. Nitz S. Olsen K. Abe R. Bomberowitz K. Cohen P. Goldhagen F. Sannes D. Saroff J. Willison 《Physics letters. [Part B]》1977,67(3):355-357
The inclusive production of π+, π?, K+, K?, p and for protons incident on carbon and tungsten targets was studied at the Internal Target Area of the Fermilab. We assume an Aα dependence for the inclusive cross sections and report here on the variation of α with incident momentum, transverse momentum and particle species. 相似文献
2.
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 《Physics letters. [Part B]》1978,73(3):369-374
For the first time, the line reversed reactions π+p→K+Σ+and K?p→π?Σ+ have been studied in the same apparatus. We present the differential cross sections and polarizations over a large t range and at two momenta, 7.0 and 10.1 GeV/c. The differential cross sections as a function of t are shown for the first time to cross over. Going from the lower to the higher momentum, the differences in cross section between the two reactions diminish at low |t| by about a factor 2. We find large polarizations of opposite sign for the two reactions. The momentum dependence, presented in the form of αeff(t) for the t range 0 to ?2 (GeV/c)2, is compared with the expectations from the K1?K7 trajectory. 相似文献
3.
S. Cittolin F. Gasparini S. Limentani P. Mittner M. Posocco C. Voci J. Chauveau M. Crozon A. Diaczek B. Lefievre P. Leruste J. Mas R. Sené J. Tocqueville 《Nuclear Physics B》1979,157(2):197-211
The cross section for the KL0p elastic scattering has been measured for the first time. The incident momentum and momentum transfer ranges are 3 ?p? 13 GeV/c, 0.1 ? |t| ? 1.3 GeV2. The results are compared to those of other experiments related to ours by isotopic spin conservation, finding agreement with some and discrepancies with others. The differential cross sections have been parametrized in the form Aebt. The coefficients show little or no dependence on energy, with A ? 9.8 mb · GeV?2and b ? 4.7 GeV?2. The effective linear trajectory has been determined and gives α0 = 0.95 ± 0.15, α′ = ?0.35 ± 0.48 GeV?2, in good agreement with dominance by pomeron exchange. 相似文献
4.
R. Göttgens G. Ransoné P. Schmitz P. Sixel H. Böttcher Y. Goldschmidt-Clermont R.T. Ross S. Squarcia M. Szczekowski K. Eskreys T. Haupt D. Kisielewska K.W.J. Barnham P.R.S. Wright M. Zomorrodian F. Mandl M. Markytan A. Jachołkowska 《Nuclear Physics B》1982,206(3):349-358
The planar features of hadronic final states in K?p interactions at 4.5, 5.6 and 14.3 GeV c.m. energy are compared with data from e+e? annihilation and deep inelastic μp scattering. A strong energy variation of the distributions (1/σ)dσ/dpt2, 〈pt2〉in and Σp2t in is observed over this energy range. Striking agreement is found between the K?p data at 14.3 c.m. energy and the leptonic data at similar hadronic c.m. energies. The behaviour of these distributions from K?p data is not well described by the simple quark fragmentation model, but shows deviations similar to those attributed to hard gluon effects in leptonic interactions. 相似文献
5.
D. P. Barber J. B. Dainton L. C. Y. Lee R. Marshall J. C. Thompson D. T. Williams T. J. Brodbeck G. Frost G. N. Patrick G. F. Pearce D. Newton T. Sloan G. R. Brookes W. J. Haynes P. B. Wilkes 《Zeitschrift fur Physik C Particles and Fields》1982,12(1):1-15
The results of an experiment to study elasticK + K ? photoproduction are presented. Differential cross sections and spin density matrix elements for ?(1.019) production are stddied as a function of incident photon energy and over a wide range of momentum transfer,t (t min >t>?1.5(GeV/c)2). Helicity conserving amplitudes are observed to dominate ? production throughout this range and the differential cross sections exhibit a forward diffractive peak which cannot be understood in terms of a simple exponential dependence. A new value of the photon ? coupling constant is determined and shown to be consistent withe + e ? annihilation measurements. A detailed study of the energy dependence of the differential cross sections is made, including other experimental data, and the extracted effective Regge trajectory compared with other diffractive processes. A study of the dependence of theK + K ? decay angular distribution on invariant mass reveals evidence for ans wave contribution interfering with thep wave ? which may be attributable to theS * meson. 相似文献
6.
A. Givernaud D. Denegri C. Lewin M. Loret L. Mosca J. Saudraix U. Gensch M. Walter M. Barth M. Van Immerseel F. Verbeure C. Dujardin R. Windmolders M. Yu. Bogolubski P. V. Chliapnikov M. S. Levitski D. I. Patalakha R. N. Riadovikov V. F. Tchunikhin A. P. Vorobjev B. Buschbeck H. Dibon M. Markytan J. Mac Naughton France-Soviet Union Collaboration CERN-Soviet Union Collaboration 《Zeitschrift fur Physik C Particles and Fields》1981,8(4):291-311
We present results of an investigation of diffraction dissociation in exclusive channels inK ± p interactions at 32 GeV/c. Total cross sections are determined forK ±→K ±π+π?,K ±2π+2π?,K 0π±π± K ±2π+π?,K ± K + K ?,K ±p \(\bar p\) , \(\bar \Lambda \) p, andp→pπ +π?,p2π+2π?,pK +K?,ΛK +,ΛK +π+π? dissociation modes, ranging from a high of ? 300 μb to ~ 3 μb. Thedσ/dt′ differential cross sections of most of the systems studied exhibit structure, with breaks of slope att′ ~ 0.2 to 0.5 GeV2; some modes have a sharp forward spike with a slope exceeding 10 GeV?2. A systematic investigation of two-body dissociation modesK→A+B andp→A′+B′ shows that these cross sections decrease with increasing threshold massM A+M B, that they are comparable for kaon and proton dissociations at similar diffractive excitation masses and are systematically suppressed by a factor 3–4 for dissociations requiring an \(s\bar s\) quark pair creation when compared to \(u\bar u\) pair creation indicating a breakdown ofSU 3 symmetry for the \(q\bar q\) sea. 相似文献
7.
8.
G. A. Akopdzhanov V. B. Anikeev V. A. Bezzubov I. A. Vasilyev Yu. V. Gilitsky S. N. Gurzhiev S. P. Denisov A. A. Durum S. A. Zvyagintsev A. V. Kozelov E. A. Kozlovsky V. M. Korablev V. I. Koreshev V. I. Kurbakov V. V. Lipaev V. A. Onuchin A. M. Rybin Yu. M. Sapunov M. M. Soldatov D. A. Stoyanova K. I. Trushin A. A. Schukin V. I. Yakimchuk 《Physics of Atomic Nuclei》2005,68(6):948-959
The results are presented for the charge asymmetry of the Dalitz plot parameters g, h, and k measured for K ± → π ± π 0 π 0 decays. The experiment has been carried out in the 35-GeV/c kaon beams at the IHEP accelerator. The g, h, and k parameters appear to be identical for K + and K ? decays within the experimental uncertainty. In particular, a value of (0.2 ± 1.9) × 10?3 is obtained for the charge asymmetry A g = (g + ? g ?)/(g + + g ?) of the Dalitz plot slope. 相似文献
9.
C. Lewin D. Denegri A. Givernaud M. Loret L. Mosca J. Saudraix H. Grässler J. Klugow U. Kriegel M. Walter E. De Wolf F. Verbeure D. R. O. Morrison F. A. Triantis C. Dujardin F. Grard Yu. Arestov M. Boglyubsky V. Bumazhnov P. V. Chliapnikov V. M. Perevoztchikov A. P. Vorobjev H. Dibon France-Soviet Union Collaboration CERN-Soviet Union Collaboration 《Zeitschrift fur Physik C Particles and Fields》1980,3(4):275-284
Results are presented onK + p andK ? p elastic scattering at 32.1 GeV/c in the |t| interval 0.06–1.4 GeV2. The samples contain approximately 15,000 events each and are obtained in the MIRABELLE bubble chamber at the Serpukhov accelerator. The |t| distributions are parametrized by quadratic exponential formsdσ/dt=A exp (bt+ct 2). The total elastic cross sections, obtained by integrating the fitted distributions, are (2.39±0.07) mb and (2.57±0.10) mb inK + p andK ? p interactions, respectively. A cross-over between theK + p andK ? p differential cross sections is found at |t c |=0.17±0.02 GeV2. The hypothesis of geometric scaling becomes valid somewhere between 32 and 70 GeV/c forK + p interactions, and is trivially verified forK ? p scattering. Finally, an impact parameter analysis of the difference betweenK ? p andK + p elastic amplitudes is presented. 相似文献
10.
G. Otter H. Remplewski G. Rudolph L. Becker R. Klein W. Lohmann H.J. Schreiber K. Böckmann U. Idschok J. Lowsky B. Schröder D.J. Kocher D.R.O. Morrison K.-L. Wernhard T. Coghen K.W.J. Barnham R. Eason H. Rohringer 《Nuclear Physics B》1979,155(2):295-306
Results are presented for p → (ΛK+) dissociation in the reactions K?p → ΛK+K? and and π±p → ΛK+π±at 10 and 16 GeV/c. The cross sections for the low-mass ΛK+ enhancement are compatible with the energy dependence σ ∝ plab?0.3. The t′ spectra or the (ΛK+) threshold enhancement are exponential in shape. Its decay angular distribution reveals neither s-channel nor t-channel helicity conservation. The relative probabilities of the processes dissociation are in the ratios 100 : 10 : 0.2, independent of the nature of the incident particle. 相似文献
11.
G.A. Akopdjanov V.V. Babincev B. Baccari P. Beilliere P.V. Chliapnikov M. Csejthey-Barth A. Daudin B. Deler T. Dombeck J.J. Dumont P.F. Ermolov A.B. Fenjuk U. Gensch L.N. Gerdyukov C. Ghesquiere H. Graessler S.A. Gumenyuk R. Windmolders 《Nuclear Physics B》1974,75(3):401-412
Topological cross sections are presented for K+p, K?p and interations at 32 GeV/c and for π+p and π?p interactions at 50 GeV/c observed in the 4.5 m Mirabelle hydrogen bubble chamber at Serpukhov. Parameters characterizing the behaviour of the multiplicity distributions, namely 〈nc〉, D and f2 and the normalized moments are given. The dependence of these parameters on the energy and the nature of the beam particle is discussed. The multiplicity distributions obtained cannot be described by a single function in the KNO variables. 相似文献
12.
D. Dekkers J.P. Guillaud V. Lepeltier M.N. Minard H. Pessard T.R. Willitts M. Yvert 《Nuclear Physics B》1977,131(1):72-79
Measurement of the exotic exchange reaction π?p → K+Σ? has been performed at 5 and 8 GeV, in the ?0.015 to ?0.13 and ?0.009 to ?0.15 (GeV/c)2 range of t repectively. We give the value near t = 0 of the differential cross section at 5 GeV, 21?21+76 nb/(GeV/c)2, and an upper limit (< 37 nb/GeV/c)2) at 8 GeV. As a check the measured differential cross section is given at both energies for the reaction π+p → K+Σ+ in the same range of t. 相似文献
13.
H.-J. Behrend J. Bodenkamp W.P. Hesse W.A. McNeely T. Miyachi D.C. Fries P. Heine H. Hirschmann A. Markou E. Seitz 《Nuclear Physics B》1978,144(1):22-60
The differential cross section of the reaction (γp → pφ) has been measured in the t range 0 ? t ? 0.4 GeV2 and for photon energies from 3.0 to 6.7 GeV. In particular for the small t region the measurement accuracy was better than 10%. We obtained for the slope parameter B in an exponential parametrization of the differential cross section dσ/dt = Ae?Bt values of which are significantly larger than the slopes obtained by most other experiments at higher t values. This indicates a t dependence of B particularly in the small t region.An energy dependence of the optical point (dσ/dt)t=0, observed in our measurements, has been explained as a kinematic effect due to the VDM relation. A fit of our measurements is in excellent agreement with all other published values of (dσ/dt)t=0(γp → φp), this implies that σtot(φp) must be essentially energy independent in this energy range.Spin density matrix elements of the φ have been evaluated and an analysis of the helicity amplitudes has been carried out. This analysis confirmed s-channel helicity conservation. Moments of spherical harmonics of the angular decay distribution have been computed for 10 MeV mass-bins from threshold to 1.3 GeV. The mass dependence of the normalized moments is generally smooth. Contributing amplitudes have essentially only even moments. The moment 〈Y20〉/〈Y00〉 changes sign above the φ mass.Differential cross sections for the inelastic φ production γp → φX have been evaluated for the first time both with respect to t?tmin and MK. The integrated inelastic cross sections are comparable in size with the elastic ones. The slopes of the differential cross sections dσ/dt appear to become flatter with increasing MX. 相似文献
14.
We present a parametrization of the ? and A2 exchange amplitudes which fits all the available data on the reactions in the momentum range from 2.5 to 200 GeV/c and for momentum transfers up to t = ?2.0 (GeV/c)2. 相似文献
15.
A partial wave amplitude analysis of LEAR data on differential cross sections and analyzing powers of p?p → K ? K + has been performed in the range p lab = 360 ? 1000 MeV/c, and compared to the results from the same observables for p?p → π?π+. Contrary to other analyses we see no compelling evidence of resonance behavior in our amplitudes. However, as we discuss, the resulting amplitudes are not unique since a third observable remains to be measured for both reactions. Another remarkable result is that for p?p → K ? K + all our solutions in the momentum interval below 900 MeV/c, only partial wave amplitudes including J max = 2 are necessary. This upper limit on the angular momentum is smaller than J max = 3 which is required for the data of the reaction p?p → π?π+ in the same momentum interval. This finding is consistent with a model analysis for data above 1 GeV/c. Annihilation models with short range baryon exchange give too small J ≥ 2 amplitudes and final state ππ and K?K interactions are presumably very important. 相似文献
16.
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
17.
D. J. Pilling 《Zeitschrift fur Physik C Particles and Fields》1981,11(1):37-42
We use the quark recombination model of Das and Hwa to predict the inclusive meson spectra (π+, π?,K +,K ?) in the target fragmentation region for processes in which a large transverse momentum jet is produced by a nearly real photon. We find that the antiparticle ratios of such target jet mesons are sensitive to the type of process which has produced the largep t jet. By comparing the ratios found in photoproduction to those in deep inelastic scattering we point out that it is in principle possible to identify the presence of the Bethe-Heitler photoproduction subprocess. We conclude that the target jet remnants can contribute to separating the subprocesses responsible for the photoproduction of largep t jets. 相似文献
18.
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
19.
H. Dijkstra R. Bailey E. Belau T. Böhringer M. Bosman V. Chabaud C. Damerell C. Daum G. de Rijk S. Gill A. Gillman R. Gilmore Z. Hajduk C. Hardwick W. Hoogland B. Kisielewski B. D. Hyams R. Klanner S. Kwan U. Kötz G. Lütjens G. Lutz J. Malos W. Männer E. Neugebauer H. Palka M. Pepé J. Richardson K. Rybicki H. J. Seebrunner U. Stierlin R. J. Tapper H. G. Tiecke M. Turala G. Waltermann S. Watts P. Weilhammer F. Wickens L. W. Wiggers A. Wylie T. Zeludziewicz ACCMOR Collaboration 《Zeitschrift fur Physik C Particles and Fields》1986,31(3):375-389
Inclusive ? meson production has been measured for 100 GeV/c and 200 GeV/c incident π?, \(\bar p\) andK ?, and for 120 GeV/c and 200 GeV/c incident π+,p andK +, using a Be target. A total of 630,000 ? mesons has been recorded in the kinematic range 0<x F <0.4. Presented are the differential cross sectionsdσ/dx F anddσ/dp T 2. The longitudinal momentum distributions show that the strange valence quarks of the incidentK mesons play an important role in ? meson production, even at smallx F . The decay angular distribution of the ? meson is evaluated in the Gottfried-Jackson frame and is expressed in the elements of the density matrix. There is a small but significant cos2 θ GJ dependence for smallp T , which decreases for increasingp T . 相似文献
20.
P. Brauel T. Canzler D. Cords R. Felst G. Grindhammer M. Helm W. -D. Kollmann H. Krehbiel M. Schädlich 《Zeitschrift fur Physik C Particles and Fields》1979,3(2):101-123
The reactionsΣ v p→π+ n,K + Λ,K + ∑ 0 andΣ v n→π+ n were studied at invariant hadronic masses around 2.2. GeV forQ 2=0.06, 0.28, 0.70, and 1.35 GeV2. The main results are: At small |t| the π+ production is dominated by longitudinally polarized photons and can be described by one pion exchange. At low |t| the transverse (π+ n) cross section drops steeply withQ 2, but remains roughly constant forQ 2≧0.5 GeV2. For |t?≧0.8 GeV2, (π+ n/dt) is almost independent ofQ 2. The integrated cross section (π+ n) shows a similarQ 2-dependence asσ tot (γ v p) forQ 2≧0.28 GeV2. The ratioσ(π- p)/σ(π+ n) atQ 2=0.70 and 1.35 GeV2 for |t|≧0.6 GeV2 is smaller than in photoproduction and close to 1/4. The ratioσ(K + ∑ 0 decreases steeply withQ 2 following roughly the predictions of the quark-parton model. 相似文献