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1.
N. M. Agababyan I. V. Ajinenko Yu. A. Belokopytov K. S. Belous H. Boettcher F. Botterweck M. M. Chapkin P. V. Chliapnikov F. Crijns A. De Roeck E. A. De Wolf K. Dziunikowska A. M. F. Endler A. Eskreys Z. C. Garutchava P. van Hal T. Haupt A. I. Katargin W. Kittel S. S. Megrabyan F. Meijers A. B. Micha?owska V. I. Nikolaenko K. Olkiewicz V. M. Ronjin R. Rosmalen H. M. T. Saarikko L. Scholten E. K. Shabalina J. Stepaniak O. G. Tchikilev V. A. Uvarov F. Verbeure R. Wischnewski S. A. Zotkin Y. V. Yarba EHS-NA Collaboration 《Zeitschrift fur Physik C Particles and Fields》1990,46(3):387-395
We report on a study of ρ0, ρ+, ω, \(\bar K^{*0} (892)\) andK *0 (892) inclusive production in π+ p interactions at 250 GeV/c, for ρ+, \(\bar K^{*0} (892)\) for the first time in a π+ p experiment. The data are compared withK + p data in the same experiment, with results of other experiments and with quark-parton models. Interesting differences are found between ρ+,0 and ω production. 相似文献
2.
M. Adamus N. M. Agababyan I. V. Ajinenko Yu. A. Belokopytov H. Bia?kowska H. B?ttcher P. V. Chliapnikov F. Crijns A. De Roeck E. A. De Wolf K. Dziunikowska A. M. F. Endler W. Friebel H. Graessler P. van Hal J. K. Karamyan D. Kisielewska W. Kittel A. I. Kurnosenko B. B. Levchenko F. Meijers M. Merk A. B. Micha?owska V. I. Nikolaenko L. C. S. Oliveira K. Olkiewicz V. M. Ronjin A. M. Rybin H. M. T. Saarikko Y. T. M. Saarikko W. Schmitz L. Scholten N. A. Sotnikova J. Stepaniak O. G. Tchikilev L. A. Tikhonova V. A. Uvarov F. Verbeure R. Wischnewski EHS/NA Collaboration 《Zeitschrift fur Physik C Particles and Fields》1988,37(2):215-229
The charged particle multiplicity distribution has been studied for non-single-diffractive π+ p andpp collisions at \(\sqrt s = 22\) GeV, for full phase space as well as for intervals in rapidity, azimuthal angle and transverse momentum. In general, the multiplicity distribution is well described by a negative binomial. From comparison of the distribution for negative or positive particles to that of all charged particles, cascading is favoured as an interpretation over stimulated emission. Interesting consequences follow from a comparison of our results to those at collider energies and toe + e ? data at comparable energy. Furthermore, evidence is given that the multiplicity distribution is not exactly of negative binomial type in every (connected or disconnected) phase space region. 相似文献
3.
V. V. Aivazyan I. V. Ajinenko Yu. A. Belokopytov P. C. Bosetti H. B?ttcher F. Botterweck P. V. Chliapnikov F. Crijns A. De Roeck E. A. De Wolf Th. Driever K. Dziunikowska A. Eskreys W. Friebel Z. C. Garutchava V. G. Gavrjusev H. Graessler P. van Hal T. Haupt W. Kittel S. S. Megrabyan F. Meijers A. B. Micha?owska V. I. Nikolaenko L. C. S. Oliveira K. Olkiewicz L. P. Petrovikh E. Riipinen V. M. Ronjin A. M. Rybin H. M. T. Saarikko W. Schmitz L. Scholten R. Schulte O. G. Tchikilev L. A. Tikhonova A. G. Tomaradze V. A. Uvarov F. Verbeure R. Wischnewski A. Wróblewski S. A. Zotkin NA Collaboration 《Zeitschrift fur Physik C Particles and Fields》1989,42(4):533-542
Forward-backward multiplicity correlations in σ+,K + p andpp collisions at 250 GeV/c ( \(\sqrt s \) =22 GeV) are given for all charges and for the different charge combinations. The correlations are found to be caused predominantly by centrally produced particles. It is demonstrated that this result is an agreement with observations at the ISR and the CERNp \(\bar p\) -Collider. The results are compared to expectations from LUND, DPM and FRITIOF Monte Carlo models and a geometrical picture relating correlations in hadron-hadron collisions toe + e ? data in terms of impact parameters is tested. 相似文献
4.
I. V. Ajinenko Yu. A. Belokopytoy H. Bialkowska H. Boettcher F. Bottorweck P. V. Chliapnikov F. Crijns A. de Roeck E. A. de Wolf K. Dziunikowska A. M. F. Endler A. Eskreys Z. C. Garutchava Y. Golubkov H. Graessler G. R. Gulkanyan P. van Hal R. Sh. Hakobyan T. Haupt W. Kittel D. Kisielewska B. B. Levchenko F. Meijers A. B. Micha?owska Th. Naumann V. I. Nikolaenko K. Olkiewicz B. Pawlik L. P. Petrovikh R. P?ll?nen V. M. Ronjin A. M. Rybin H. M. T. Saarikko W. Schmitz L. Scholten L. N. Smirnova O. G. Tchikilev A. G. Tomaradze V. A. Uvarov F. Verbeure R. Wischnewski EHS-NA Collaboration 《Zeitschrift fur Physik C Particles and Fields》1989,42(3):377-385
Multiplicity distributions, observed inK + interactions with Al and Au nuclei at 250 GeV/c incident momentum are presented. They are analyzed in the framework of multiple collisions of the incident particle inside a nucleus. The probability distribution of the number of grey tracks is well described by the model of Andersson et al., if a negative binomial distribution is assumed for the distribution of the number of grey protons produced per elementary collision instead of the usual geometrical distribution. The analysis of the average and dispersion of the charge multiplicity distribution supports the validity of the multiple collision model, including results on correlations between forward and backward multiplicities. 相似文献
5.
I. V. Ajinenko H. Białkowska H. Böttcher F. Botterweck F. Crijns A. De Roeck E. A. De Wolf K. Dziunikovska A. M. F. Endler P. F. Ermolov Z. C. Garutchava Y. A. Golubkov N. G. Grigoryan G. R. Gulkanyan P. van Hal T. Haupt J. K. Karamyan Z. A. Kirakosyan D. Kisielewska W. Kittel S. S. Megrabyan F. Meijers A. B. Michałowska K. Olkiewicz L. P. Petrovikh A. M. Rybin H. Saarikko L. Scholten E. K. Shabalina F. Verbeure R. Wischnewski S. A. Zotkin 《Zeitschrift fur Physik C Particles and Fields》1991,49(3):367-374
Collective characteristics are studied of hadrons produced in beam fragmentation of non-single-diffractive π+ p-interactions at 250 GeV/c. An attempt is made to obtain experimental information on the properties of leading cluster production and fragmentation. On average, the leading cluster carries 0.8±0.1 of the incident momentum, so that the mean value of the inelasticity coefficient of 〈k〉=0.2±0.1 is significantly smaller than that deduced from leading single hadron spectra. The momentum transfer distribution shows that nonsingle-diffractive processes are less peripheral than diffraction dissociation. The analysis of thrust and sphericity shows jet-like structure of pion fragmentation, that of the charge flow an average forward charge of 〈Q f 〉=0.45±0.04, in agreement with the average charge of the beam valence quarks. Our data are compared to diffraction dissociation and to the Fritiof model. 相似文献
6.
N. M. Agababyan I. V. Ajinenko Yu. A. Belokopytov H. Boettcher P. V. Chliapnikov F. Crijns A. De Roeck E. A. De Wolf K. Dziunikowska Z. C. Garutchava V. G. Gavrjusev H. Graessler G. R. Gulkanyan P. van Hal T. Haupt W. Kittel D. Kisielewska F. Meijers A. B. Michalowska V. I. Nikolaenko L. C. S. Oliveira K. Olkiewicz V. M. Ronjin A. M. Rybin H. M. T. Saarikko Y. T. M. Saarikko W. Schmitz L. Scholten O. G. Tchikilev L. A. Tikhonova A. G. Tomaradze V. A. Uvarov F. Verbeure R. Wischnewski A. Wróblewski S. A. Zotkin EHS-NA Collaboration 《Zeitschrift fur Physik C Particles and Fields》1989,41(4):539-555
A detailed analysis of the inclusive production of the vector mesonsφ,K *+,0(892) \(\bar K*^0 (892),\rho ^{ + ,0} ,\omega \) and the tensor mesonsK 2 *0 )(1430) andf 2(1270) inK + p interactions at 250 GeV/c is presented The data are compared with results at lower energies and with various quark-parton models. The production ofρ 0,K *0(892) and \(\bar K*^0 (892)\) increases at the same rate as a function ofs, is concentrated in the central region and is not reproduced by the models. Production of the tensor mesonsf 2(1270) andK 2 *0 (1340) is suppressed relative toρ 0 andK *0(892) by a factor of about 3. 相似文献
7.
K. Böckmann J. Hofmann U. Idschok J. Lowsky B. Schröder V. Blobel H. Fesefeldt R. Schulte G. Kellner D.R.O. Morrison H. Saarikko T. Coghen 《Nuclear Physics B》1980,166(2):284-300
A study is presented of the inclusive production cross sections of K1±(892) vector mesons in pp interactions at 12 and 24 GeV/c and in π+p interactions at 16 GeV/c. The K1± inclusive cross section is ~0.9 mb for both pp at 24 GeV/c and π+p interactions at 16 GeV/c. For pp interactions, and are seen to rise with energy, showing a threshold behaviour. In both pp and π+p interactions, largely exceeds at these energies and this excess is interpreted as K1+ production by beam and target fragmentations. The decays of K1±0 yield ~30% of the K0 observed in the final states. The pT2 dependence of both K1+ and K1? cross sections is described by an exponential with slope of ~3.3 (GeV/c)?2. The longitudinal momentum spectra for K1+ in 16 GeV/cπ+p and 24 GeV/c pp interactions are similar in shape in the target hemisphere. The K1? spectra are similar over the whole kinematic region when viewed in the quark c.m.s. and point to a central production mechanism. Comparing K1+ and ρ0 production, striking similarities are found. 相似文献
8.
M. Deutschmann G. Otter H. Böttcher H.J. Schreiber V.T. Cocconi G. Kellner D.J. Kocher D.R.O. Morrison H. Saarikko K.L. Wernhard D. Kuhn R.M. Eason B. Pollock F. Mandl M. Markytan 《Physics letters. [Part B]》1978,73(1):96-98
A total of 101 ω? decays have been found in K?p interactions at 10 and . The decay angular distribution has been fitted under the assumptions that the ω? has spin either . It has been found that the probability of isotropy (spin is less than one in a thousand, whereas the probability for spin is about 70%. Thus, we exclude the spin assignment. The lifetime of the ω? is found to be (1.41?0.24+0.15) × 10?10s, in agreement with our earlier result based on about of the present sample. 相似文献
9.
J. Bartke H. Kirk J. Kaltwasser J. Klabuhn K. Böckmann G. Zobernig H. Bohr M.J. Counihan P.K. Malhotra D.R.O. Morrison H. Saarikko K. Śliwa T.C. Bacon P.J. Dornan F. Mandl M. Markytan M. Bardadin-Otwinowska A. Wroblewski 《Nuclear Physics B》1977,118(5):360-370
The production of η(550) and ω(780) mesons is studied in π±p interactions at 16 GeV/c and K?p interactions at 10 and 16 GeV/c. Cross sections for exclusive channels are presented, and for the π+p data differential cross sections are given for quasi-inclusive production where the η or ω is required to be accompanied by charged particles only. Close similarities are observed between η, ω and also ?0(770) production in terms of longitudinal and transverse variables. By a rough estimate, the η, ω and ?0 inclusive yields are found to be in the ratio 0.32 : 0.85 : 1, respectively, for 16 GeV/cπ+p collisions. For non-peripheral production we estimate this same ratio to be 0.34 : 0.9 : 1. 相似文献
10.
H. Grässler D. Lanske R. Schulte H.H. Seyfert K. Böckmann C. Geich-Gimbel T. Kokott B. Nellen R. Pech H. Saarikko P. Bosetti V.T. Cocconi D.C. Cundy A. Grant P.O. Hulth H. Klein D.R.O. Morrison B. Saitta 《Physics letters. [Part B]》1981,99(2):159-162
Two examples of charmed baryon production by neutrinos have been observed in BEBC filled with hydrogen. Both events fit uniquely the reaction νp → μ?pK?π+π+ and thus apparently violate the ΔS = ΔQ rule. None of the appropriate mass combinations is consistent with the mass values of the D0 and D+ mesons. However, for the mass combinations of the pK?π+ systems, values of (2.285 ± 0.005) GeV and (2.280 ± 0.003) GeV are found for event 1 and 2, respectively. These values agree with the mass of (2.285 ± 0.006) GeV for the Λc+ charmed baryon determined recently in e+e? collisions at SLAC. 相似文献