D. Hochman
Weizmann Institute of Science
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Featured researches published by D. Hochman.
Physics Letters B | 1983
M. Althoff; W. Braunschweig; K. Gather; F. J. Kirschfink; K. Lübelsmeyer; H.-U. Martyn; G. Peise; J. Rimkus; H. G. Sander; D. Schmitz; H. Siebke; D. Trines; W. Wallraff; H. M. Fischer; H. Hartmann; E. Hilger; W. Hillen; G. Knop; L. Köpke; H. Kolanoski; H. Kück; R. Wedemeyer; N. Wermes; M. Wollstadt; H. Burkhardt; H. Hultschig; P. Joos; W. Koch; U. Kötz; H. Kowalski
Abstract D∗± production via e+e−→D∗±X has been measured at an average CM energy of 34.4 GeV. The D∗± energy spectrum is hard, with a maximum near χ = 0.6. The size of the D∗ cross section, R D ∗ = σ( e + e − → D ∗ X ) σ μμ = 2.50 ± 0.64 ± 0.88 (assuming R D ∗0 = R D ∗+ ) indicates that a large fraction of charm quark production yields D∗ mesons. The D∗± angular distribution exhibits a forward—backward asymmetry, A = −0.28 ± 0.13. This is consistent with that expected in the standard theory for weak neutral currents and leads to |gAc| = 0.89 ± 0.44 for the axial vector coupling of the charm quark.
Nuclear Physics | 1978
Y. Eisenberg; B. Haber; D. Hochman; U. Karshon; L. Lyons; E. Ronat; A. Shapira; M. Tabak; G. Yekutieli; H. Braun; A. Fridman; J.P. Gerber; H. Johnstad; P. Juillot; G. Maurer; C. Voltolini
Abstract The inclusive reactions pn → p s + x and π + n → p s + x at incident momentum of 195 GeV/ c have been studied in an exposure of the Fermilab 30 inch deuterium filled bubble chamber to a mixed ( π + , p) beam. Analysing the t and M 2 dependence of our data within the framework of triple-Regge models we conclude that pion exchange yields a dominating contribution. Comparing our data with the pp results we conclude that isoscalar Regge exchange, ω, is much larger than isovector, ϱ, Regge exchange. We observe significant leading π − emission from the recoiling mass x, comparable to that observed in on-mass-shell π − p → π − experiments. This verifies our conclusions about pion-exchange dominance in the above reactions.
Nuclear Physics | 1975
D. Hochman; Y. Eisenberg; A. Engler; U. Karshon; E. Ronat; A. Shapira; G. Yekutieli
Abstract Cross sections, multiplicities and particle inclusive spectra are presented for π - , K 0 and Λ produced in pn reactions at 11.6 GeV/ c beam momentum. The results are compared with the data from pp interactions in the same energy range. Correlations between two π - are also discussed. The main results are: the π - , K 0 and Λ all behave similarly as a function of transverse momentum squared; π - in the forward c.m. hemisphere have spectra in x and y consistent with that of pp interactions, whereas the spectra of π - in the backward hemisphere fall off more slowly with ∥ x ∥ and ∥ y ∥ than those in the forward hemisphere, suggesting n -fragmentation effects. The K 0 and Λ have x and y distribution roughly similar to those in pp interactions. The K 0 and Λ are consistent with a modified form of KNO scaling.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1986
S. Dado; J. Goldberg; N. Lupu; Allen Mincer; Gideon Alexander; G. Bella; Y. Gnat; J. Grunhaus; A. Levy; J. Cohen; D. Hochman; Lorne Levinson; G. Mikenberg; R. Mir; A. Shapira; M. Winik; G. Yekutieli; N. Zwang
Abstract A new type of thin gap multiwire gas detector operating in a high gain mode has been developed for use in the OPAL pole tip calorimeter. The detector thickness is only 6.6 mm and its area is 0.61 m 2 . The induced pad readout provides high output pulses which require no amplification. The set-up for the detector mass production and quality control test is described. Results from a test beam set-up that simulates the OPAL pole tip calorimeter are presented and compared with computer simulations.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1990
C. Beard; R. Hammarström; D. Hatzifotiadou; C. Kleinwort; L. Köpke; N. Wermes; G.W. Wilson; W. D. Zeuner; Ehud Duchovni; D. Hochman; D. Lellouch; Lorne Levinson; G. Mikenberg; M. Shoa
Abstract Thin multiwire chambers, operating in a high gain mode, are used for electromagnetic presampling in the endcaps of the OPAL detector at LEP. The design, setup and performance of these chambers with respect to energy and space resolution for electromagnetic showers as well as to pion/electron separation is described.
Physics Letters B | 1976
Y. Eisenberg; B. Haber; D. Hochman; U. Karshon; E. Ronat; A. Shapira; J. Schultz; R. Yaari; G. Yekutieli; H. Braun; D. Brick; F. Etienne; A. Fridman; E. Jegham; P. Juillot; G. Maurer; A. Michalon
Abstract Topological inelastic cross-sections and average multiplicities for pd and π + d interactions at 195 GeV/c, are obtained from an exposure of the NAL 30″ proportional wire chamber-bubble chamber hybrid system to a positive π + /p beam. We find that 〈 n c 〉 pn = 7.67 ± 0.25, and 〈 n c 〉 π + n = 7.56 ± 0.30, yielding a negative multiplicity difference between pn and pp of 0.50 ± 0.14, and that σ n (pp) is approximattely interleaved between σ n −1 (pn).
Physics Letters B | 1981
D. Brick; H. Rudnicka; A. M. Shapiro; M. Widgoff; R.E. Ansorge; W. W. Neale; D. R. Ward; B. M. Whyman; R.A. Burnstein; H. A. Rubin; E.D. Alyea; L. Bachman; C.Y. Chien; P. Lucas; J. T. Bober; M. Elahy; T. A. J. Frank; E. Hafen; P. Haridas; D. Huang; R. I. Hulsizer; V. Kistiakowsky; P. Lutz; S. H. Oh; I. A. Pless; T. B. Stoughton; V. Suchorebrow; S. Tether; P. C. Trepagnier; Y. Wu
Abstract The energy dependence of the average of the charged multiplicity and its dispersion in π + /K + /p interaction on protons at 147 GeV/ c is found to be the same as in e + e − annihilations if an “effective energy” variable is used instead of the total energy. The effective energy S eff is defined as the invariant mass of all secondaries left after the two leading particles have been removed. Fitting the expression aS eff b to the average charge multiplicity 〈 n ch 〉, we find the power b to be in good agreement with the value of 0.25 predicted by Fermis statistical model and by Landaus hydrodynamical model.
Nuclear Physics | 1979
Y. Eisenberg; B. Haber; D. Hochman; U. Karshon; L. Lyons; E. Ronat; A. Shapira; R. Yaari; G. Yekutieli
Abstract We present results on single-particle inclusive distributions in p( π + )n reactions from a Fermilab experiment using the hybrid 30″ bubble chamber and PWC facility. Distributions in rapidity, y , Feynman x and p 2 T for π + and π − are presented and compared with other experiments. The effects of different targets and projectiles (neutrons, protons and pions) on the distributions are demonstrated and discussed in terms of projectile and target fragmentation. The average transverse momentum 〈 P T 〉 is studied as a function of x , y and multiplicity.
Nuclear Physics | 1974
D. Hochman; Y. Eisenberg; U. Karshon; A. Shapira; E. Ronat; D. Yaffe; G. Yekutieli; D. Saltzman
The process pn → ppπ− is studied in pd collisions at 11.6 GeV/c. A broad low-mass enhancement of pπ− is found in the diffractive reaction pn → p(pπ−) with a cross section slightly smaller than that of a similar analysis at 7.0 GeV/c. The non-diffractive reaction pn → (pπ−)p shows some evidence for resonance production and its cross-section dependence on energy is characteristic of meson exchange. Samples of mass, momentum transfer, and decay angular distributions are compared with the predictions of a double Regge model and a reggeized one-pion exchange model. Using in addition information from the reactions pp → ppπ0, pp → pnπ+ at 12.0 GeV/c, an isospin analysis of the single pion production reaction from nucleon-nucleon scattering, N1N2 → N3(N4π) is presented.
Nuclear Physics | 1974
D. Hochman; Y. Eisenberg; U. Karshon; A. Shapira; E. Ronat; D. Yaffe; G. Yekutieli
Abstract The coherent reaction pd → pdπ+π− is studied in pd collisions at 11.6 GeV/c. Strong Δ++ (1236) production together with some dπ− enhancement (d0∗) at ∼2200 MeV are found in this reaction. The mass spectrum of the pure I = 1 2 combination pπ+π− shows a significant peak at ∼1460 MeV. A double Regge fit describes the general feature of the M(pπ+π−) distribution, but does not reproduce the narrow peak. Comparison with a similar analysis at 7.0 GeV/c shows the same results, however the d0∗ cross section decreases with incident energy.