共查询到20条相似文献,搜索用时 187 毫秒
1.
E.L. Berger 《Physics letters. [Part B]》1974,49(4):369-373
From an approach to multiparticle production in which clusters of hadrons are emitted, the formalism is developed for an analysis of rapidity correlations in the central region at fixed multiplicity. Predictions are given for multiplicity, energy, and rapidity dependence of correlation functions. 相似文献
2.
We study a general formulation of semi-inclusive two-particle rapidity correlations for short-range models. We use it to compare with the 205 GeV NAL Bubble Chamber data different decay distributions for independently emitted clusters. We also comment on non-independent cluster production and on semi-inclusive correlations between charged and neutral particles. 相似文献
3.
The short range two particle rapidity correlations at ISR energies are interpreted in terms of clustering effects in the central rapidity region. It is shown that the experimental data give an indication that large clusters are produced, and as a consequence one should observe short range correlation between π?′s. The energy dependence of the data is also simply explained. 相似文献
4.
Many-particle rapidity correlations in light-ion interactions at the CERN intersecting storage rings
W. Bell A. Breakstone G. Claesson H. B. Crawley G. M. Dallavalle K. Doroba D. Drijard F. Fabbri A. Firestone M. A. Faessler H. G. Fischer S. Y. Fung S. Garpman W. Geist G. Giacomelli R. Gokieli M. Gorbics C. R. Gruhn P. Hanke M. Heiden W. Herr T. J. Ketel E. E. Kluge J. W. Lamsa T. Lohse I. Lund L. K. Mangotra R. Mankel W. T. Meyer G. Mornacchi T. Nakada I. Otterlund M. Panter H. Pugh A. Putzer K. Rauschnabel B. Rensch F. Rimondi M. Schmelling L. Schroeder R. Sosnowski E. Stenlund T. J. M. Symons M. Szczekowski R. Szwed O. Ullaland R. Walczak D. Wegener M. Wunsch 《Zeitschrift fur Physik C Particles and Fields》1986,32(3):335-342
Many-particle rapidity correlations have been studied for αα,dd, andpp interactions at the CERN Intersecting Storage Rings using the Split-Field Magnet detector, and basing the investigating on the distributions of rapidity gaps between particles. In the framework of a simple cluster model, it is found that all the data samples have similar features and that the events contain clusters of two different types. 相似文献
5.
V. Blobel H. Fesefeldt P. Freund C. Geich-Gimbel B. Hellwig U. Idschok J.W. Lamsa D. Lüers D. Mönkemeyer N. Schmitz B. Schröder B.M. Schwarzschild 《Nuclear Physics B》1975,88(1):18-40
In this paper we study correlations in multiparticle final states from pp interactions at 12 and 24 GeV/c. In an attempt to distinguish true dynamical correlations from the consequences of kinematics together with PT damping and the leading-particle effect, we compare the data with an independent-emission model which reproduces the single-particle spectra and also with a model that simulates a fragmentation mechanism. We investigate the forward-backward particle configurations and in particular the multiplicity imbalance and charge transfer, defining forward-backward by the largest rapidity gap as well as simply by c.m.s. hemispheres. We also study clustering by looking at distributions of the dispersions in longitudinal rapidity. From the comparison of the data with the models we find clear evidence for dynamical correlations of a sort one would expect from fragmentation-type mechanisms. We also find indications of non-fragmentation formation of neutral meson clusters. 相似文献
6.
The short-range effect in azimuthal and rapidity correlations can be explained within the independent cluster model taking into account the cluster transverse momentum and the Bose-effect (identical particle effect) in the single as well as the two-cluster term. Good agreement with data from Dubna, NAL and ISR is obtained. From the data we determine parameters related to the longitudinal and transverse dimensions of the clusters. 相似文献
7.
Based on the thermodynamic model for particle production, inclusive two-particle correlations are studied. The model is used to study integrated correlations R(2)(s) and rapidity correlations at accelerator and ISR energies.Particle production is described via the formation of clusters called fireballs. The average mass of these clusters changes as with the primary energy s and fireball rapidity η. The model produces in the limiting cases the same correlations as the multiperipheral model (with w = 0) and the diffractive excitation model (with w = 1) but contains also all intermediate cases (0 < w < 1) in which fireballs increasing in mass and number are formed. The average number of fireballs produced is also calculated. At ISR energies integrated correlations R(2) and rapidity correlations are very different in the cases . Therefore, experimental data at high energy on R(2)(s) or on rapidity correlations will allow one to determine the parameter w. Measurements of these different quantities should result in a consistent picture for the production of fireballs. 相似文献
8.
U. Amaldi W. Bartel G. Cocconi A.N. Diddens Z. Dimcovski R.W. Dobinson P. Duinker A.M. Thorndike A.M. Wetherell F. Mönnig G. Bellettini P.L. Braccini R. Castaldi V. Cavasinni T. Del Prete P. Laurelli G. Sanguinetti M. Valdata R. Thun 《Physics letters. [Part B]》1975,58(2):213-218
Data, obtained from p-p collisions at centre-of-mass energies between 31 and 63 GeV, are presented on inclusive and semi-inclusive correlations between forward emitted neutrons and charged particles observed in an omnidirectional hodoscope. A total absorption spectrometer was used to detect the neutrons and to measure their energy. Significant correlations are observed over the whole rapidity range. The data suggest that neutrons result from the decay of clusters emitted in the fragmentation region. 相似文献
9.
We analyze in the cluster model framework not only recent data on zones, rapidity gap distributions and charge transfer correlations in multiparticle production, but also data on “older” quantities, in particular on inclusive and semi-inclusive longitudinal correlations. We show that a global analysis of experimental results strongly constrains the cluster characteristics. High intracluster multiplicities are definitely excluded while about 50 to 60% of clusters have to carry an electric charge; these conclusions show that well-known mesonic resonance production may indeed account for a large part of clustering. 相似文献
10.
U. Amaldi W. Bartel G. Cocconi A.N. Diddens Z. Dimcovski R.W. Dobinson P. Duinker A.M. Thorndike A.M. Wetherell G. Bellettini P.L. Braccini R. Castaldi T. Del Prete P. Laurelli G. Sanguinetti M. Valdata A. Baroncelli G. Matthiae R. Thun 《Physics letters. [Part B]》1975,58(2):206-212
Data obtained from p-p collisions at centre-of-mass energies between 31 and 63 GeV are presented on correlations between momentum analysed forward π?, K? and and charged particles observed in an omnidirectional hodoscope. The data show that significant correlations are present over the whole rapidity range for all three types of negative particles. The dependence on various kinematic variables suggests a cluster mechanism for the production of particles. In this picture, pions would be produced in clusters emitted in the fragmentation region while K? and emanate from non-leading clusters. 相似文献
11.
J. L. Bailly S. Banerjee F. Bruyant B. Buschbeck C. Caso H. Dibon B. Epp A. Ferrando F. Fontanelli T. Gemesy A. Gurtu R. Hamatsu Ph. Herquet T. Hirose J. Hrubec Yu. Ivanysherkov E. P. Kistenev N. Khalatyan S. Kitamura T. Kreuzberger V. Kubik P. Lipa P. K. Malhotra M. Markytan I. S. Mittra L. Montanet G. Neuhofer G. Pinter P. Porth R. Raghavan T. Rodrigo J. B. Singh S. Squarcia U. Trevisan K. Takahashi L. A. tikhonova T. Yamagata G. Zholobov J. Zoll S. A. Zotkin NA EHS - RCBC Collaboration 《Zeitschrift fur Physik C Particles and Fields》1988,40(1):13-24
Two particle correlations of hadrons produced in 360 GeV/cpp interactions are investigated in the transverse plane and in rapidity. The data were obtained at the European hybrid spectrometer equipped with a rapid cycling bubble chamber. The observed transverse and rapidity correlations are compared with the one string LUND-and a two string dual parton-model. These models predict in general stronger correlations in the transverse plane and much weaker correlations in rapidity than found in the data. The LUND-FRITIOF-and multichain dual parton models provide a better reproduction of the data, although the agreement is not yet satisfactory. Only the UA5 cluster model GENCL shows agreement with the data. 相似文献
12.
P.I. Tataru-Mihai 《Nuclear Physics B》1975,91(2):359-364
A model-independent qualitative discussion on semi-inclusive rapidity correlations in high-energy multi-particle production processes is presented. Connection with previous results on the same subject are pointed out. Finally, one discusses semi-inclusive rapidity correlations in terms of reduced rapidities. 相似文献
13.
14.
I. Derado V. Eckardt J. Fent P. Freund H. J. Gebauer A. Manz K. P. Pretzl N. Schmitz P. Seyboth J. Seyerlein P. Stopa D. Vranić G. Wolf T. Coghen A. Eskreys K. Eskreys D. Kisielewska P. Malecki K. Olkiewicz B. Pawlik 《Zeitschrift fur Physik C Particles and Fields》1988,40(1):25-27
An analysis of correlations in rapidity of charged particles produced in proton and antiproton interactions on hydrogen, argon and xenon at 200 GeV is presented. Positive long-range correlations are observed in interactions on heavy targets. The dependence of rapidity correlations between the forward and backward hemisphere on the number of projectile collisions is discussed. 相似文献
15.
Lj. Simić L. Rak O. Adamović M. Jurić Tsai Chü C. O. Kim J. Lory B. Willot D. Schune C. Meton R. Kaiser I. Otterlund E. Stenlund H. Areti C. J. Hébert J. Hébert G. Baumann R. Devienne R. Schmidt L. Bravo R. Niembro A. Ruiz E. Villar J. M. Bolta M. A. Sanchis 《Zeitschrift fur Physik C Particles and Fields》1979,2(4):291-294
We present a study of two-particle correlations in proton-emulsion nucleus reactions at 400 GeV. In particular the correlations at different nuclear excitations and different rapidity regions are treated. Positive correlations, depending on nuclear excitation, are observed in the rapidity region η<1.5. 相似文献
16.
J. Dias de Deus 《Zeitschrift fur Physik C Particles and Fields》1990,46(1):125-128
The effect of leading charges in negative and charged particle distributions in limited rapidity bins is discussed with particular emphasis on the extent in rapidity of strong charge correlations. 相似文献
17.
P. Aurenche Rahul Basu M. Fontannaz 《The European Physical Journal C - Particles and Fields》2008,57(4):681-688
We discuss, in the framework of perturbative QCD at next to leading order, two related observables which are usually considered
to provide tests of the BFKL dynamics: jet–jet correlations at Tevatron energies and forward particle–jet correlations at
HERA. In the first case we study the rapidity gap dependence of the azimuthal correlations and find slightly too strong correlations
at large gap. In the second case we discuss the cross section as well as the azimuthal correlations over a rapidity gap range
of 5 units. We find that the requirement of a forward particle imposes strong kinematical constraints which distort the distributions,
notably at small rapidity gaps. We also show that the decorrelation is stronger in electroproduction than in hadron–hadron
collisions. Unfortunately data are not yet available for comparison. 相似文献
18.
R. Singer Y. Cho T. Fields L.G. Hyman P.A. Schreiner L. Voyvodic R. Walker J. Whitmore R. Engelmann T. Kafka C. Moore M. Pratap 《Physics letters. [Part B]》1974,49(5):481-487
Using data obtained from an exposure of the 30-inch bubble chamber at NAL, inclusive and semi-inclusive two-particle rapidity correlations are analyzed for charged-charged, ??, ++, and ± particles. For the inclusive sample, positive correlations are observed in the central region. In the semi-inclusive case, the four-and six-prong events exhibit strong positive correlations near 90° CM. Selection of four-prong events with a large rapidity gap shows that the strong correlation seems to be associated with diffractive-type events. 相似文献
19.
20.
The centrality and energy dependence of rapidity correlation patterns are studied in Au+Au collisions by using AMPT with string melting,RQMD and UrQMD models.The behaviors of the shortrange correlation(SRC)and the long-range correlation(LRC)are presented clearly by two spatial-position dependent correlation patterns.For centrality dependence.UrQMD and RQMD give similar results as those in AMPT,i.,e., in most central collisions,the correlation structure is flatter and the correlation range is larger,which indicates a long range rapidity correlation.A long range rapidity correlation showing up in RQMD and UrQMD implies that patton interaction is not the only source of long range rapidity correlations.For energy dependence,AMPT with string melting and RQMD show quite different results.The correlation patterns in RQMD at low collision energies and those in AMPT at high collision energies have similar structures,i.e.aconvex curve.while the correlation patterns in RQMD at high collision energies and those in AMPT at low collision energies show fiat structures,having no position dependence.Long range rapidity correlation presents itself at high energy and disappears at low energy in RQMD,which also indicates that long range rapidity correlations may come from some trivial effects,rather than the parton interactions. 相似文献