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Publication
Featured researches published by D. Lanske.
Nuclear Physics | 1976
J. Blietschau; H. Deden; H. Faissner; F.J. Hasert; W. Krenz; D. Lanske; J. Morfin; M. Pohl; K. Schultze; H. Weerts; L. Welch; G. Bertrand-Coremans; M. Dewitt; H. Mulkens; J. Sacton; W. Van Doninck; D. Cundy; I. Danilchenko; D. Haidt; P. Musset; K. Myklebost; J.B.M. Pattison; D.H. Perkins; D. Pittuck; F. Romano; H. Wachsmuth; V. Brisson; B. Degrange; M. Haguenauer; L. Kluberg
Abstract In the Gargamelle neutrino experiment, three unambiguous candidates for the reaction ν μ + e − → ν μ e − have been observed corresponding to a cross section for a recoil electron energy within the range 0.3 e − GeV of 0.06 × 10 −41 E ν ( GeV ) cm 2 / electron . The calculated background is 0.44 ± 0.13 events and the probability that all three candidates could be due to this background is 1%.
Nuclear Physics | 1983
H. Grässler; D. Lanske; R. Schulte; G. Jones; R.P. Middleton; S. W. O'Neale; K. Böckmann; W. Gebel; C. Geich-Gimbel; B. Nellen; A. Grant; D.R.O. Morrison; P. Schmid; H. Wachsmuth; J.S. Chima; M.M. Mobayyen; M. Talebzadeh; O. Villalobos-Baillie; M. Aderholz; L. Deck; N. Schmitz; R. Settles; K.L. Wernhard; W. Wittek; G. Corrigan; G. Myatt; D. Radojicic; B. Saitta; J. Wells
In an experiment with the hydrogen bubble chamber BEBC at CERN multiplicities of hadrons produced in νp and vp interactions have been investigated. Results are presented on the multiplicities of charged hadrons and neutral pions, forward and backward multiplicities of charged hadrons and correlations between forward and backward multiplicities. Comparisons are made with hadronic reactions and e+e− annihilation. In the framework of the quark-parton model the data imply similar charged multiplicities for the fragments of a u- and a d-quark, and a larger multiplicities for the fragments of a uu- than for a ud-diquark. The correlation data suggest independent fragmentation of the quark and diquark for hadronic masses above ∼ 7 GeV and local charge compensation within an event.
Nuclear Physics | 1981
P. Allen; J. Blietschau; H. Grässler; D. Lanske; R. Schulte; H.H. Seyfert; K. Böckmann; C. Geich-Gimbel; T. P. Kokott; B. Nellen; R. Pech; H. Saarikko; P. Bosetti; V.T. Cocconi; B. Conforto; A. Grant; P.O. Hulth; G. Kellner; D. R. O. Morrison; R. Orava; L. Pape; P. Schmid; W.G. Scott; H. Wachsmuth; M. Aderholz; N. Schmitz; R. Settles; K.L. Wernhard; W. Wittek; R. Batley
Abstract Multiplicity distributions of charged hadrons produced in νp interactions are studied using a sample of 7850 charged current interactions in BEBC. Multiplicity moments are studied as functions of the invariant mass of the hadronic system, W , and a comparison is made with other lepton- and hadron-induced reactions. The mean charged multiplicity 〈 n ch 〉 is found to increase linearly with ln W 2 . The other multiplicity moments indicate a close similarity between the neutrino scattering and the class of annihilation processes. A study of the multiplicity distributions in the forward and backward directions in the hadronic c.m.s. gives results in qualitative agreement with the quark parton model.
Physics Letters B | 1976
J. Blietschau; H. Deden; F.J. Hasert; W. Krenz; D. Lanske; J. Morfin; M. Pohl; H. Weerts; L. Welch; G. Bertrand-Coremans; H. Mulkens; J. Sacton; W. Van Doninck; D. Cundy; I. Danilchenko; D. Haidt; A. Lloret; C. Matteuzzi; P. Musset; K. Myklebost; J.B.M. Pattison; D.H. Perkins; D. Pittuck; F. Romano; H. Wachsmuth; A. Blondel; V. Brisson; B. Degrange; T. Francois; M. Haguenauer
Abstract In addition to one previously reported event, a second event, in which a positron is observed together with a strange particle and a negative muon, has been seen in the bubble chamber Gargamelle exposed to the CERN neutrino beam. The level of the background for this type of event is found to be very low. The data strongly indicate the existence of a new type of interaction leading to a charged lepton pair correlated with a strange particle in the final state. The interpretation of these two events in terms of production of a charmed hadron is presented.
Nuclear Physics | 1983
P. Allen; H. Grässler; D. Lanske; R. Schulte; K. Böckmann; C. Geich-Gimbel; B. Nellen; H. Saarikko; A. Grant; D. R. O. Morrison; P. Schmid; H. Wachsmuth; M. Aderholz; T. Coghen; N. Schmitz; K.L. Wernhard; W. Wittek; G. Corrigan; G. Myatt; D. Radojicic; B. Saitta; J. Wells
Abstract Distributions of the Feynman x variable have been determined for positive and negative pions in charged current neutrino-proton and antineutrino-proton reactions with hadronic energy W > 3 GeV and Bjorken x B > 0.1. The distributions have been corrected for experimental effects such as measurement errors, uncertainties in estimating the neutrino energy and particle misidentification. In the framework of the quark-parton model, the distributions yield information about the fragmentation of forward going u and d quarks and backward going uu and ud diquarks. Approximate Feynman scaling is observed for the invariant Feynman x F distributions. They can be fitted by a power law of the form (1 − | x F |) n as suggested by the dimensional counting rules. Simple isospin relations predicted by the quark-parton model are fulfilled. The fragmentation of diquarks is compared with that of protons into π ± .
Physics Letters B | 1973
T. Eichten; H. Deden; F.J. Hasert; W. Krenz; J. von Krogh; D. Lanske; J. Morfin; H. Weerts; G. Bertrand-Coremans; J. Sacton; W. Van Doninck; P. Vilain; Donald C Cundy; D. Haidt; M. Jaffre; G. Kalbfleisch; S. Natali; Paul Musset; J.B.M. Pattison; D.H. Perkins; A. Pullia; A. Rousset; W. Venus; H. Wachsmuth; V. Brisson; B. Degrange; Maurice Haguenauer; L. Kluberg; U. Nguyen-Khac; P. Petiau
Abstract The total cross-sections for v e ( v e ) -nucleon scattering have been measured. A test has been made of the muon number conservation law. A limit of 2.4 GeV is found the mass of the “Georgi-Glashow type” heavy lepton
Physics Letters B | 1973
T. Eichten; A. Rousset; E. Bellotti; C. Conta; C. Baltay; John McKenzie; P. Heusse; U. Nguyen-Khac; L. Kluberg; H. Weerts; E. Fiorini; W. Venus; J.B.M. Pattison; L.M. Chounet; S. Bonetti; D.H. Perkins; D. Lanske; P. Vilain; M. Haguenauer; V. Brisson; D. Cundy; P. Petiau; J.L. Pinfold; G. Kalbfleisch; G. Bertrand-Coremans; M.J. Esten; B. Degrange; P. Musset; C. Franzinetti; J.P. Vialle
Abstract The total cross-sections for v e ( v e ) -nucleon scattering have been measured. A test has been made of the muon number conservation law. A limit of 2.4 GeV is found the mass of the “Georgi-Glashow type” heavy lepton
Nuclear Physics | 1982
H. Grässler; C. Geich-Gimbel; R. Settles; R. Pech; P. Schmid; N. Schmitz; R. Batley; W. Wittek; R. Schulte; P. Grossmann; H.H. Seyfert; D. Radojicic; M. Aderholz; D.R.O. Morrison; G. Myatt; A. Grant; D. Lanske; V.T. Cocconi; B. Nellen; H. Wachsmuth; B. Saitta; P.O. Hulth; K.L. Wernhard; E. Simopoulou; R.H. Giles; K. Böckmann; H. Saarikko; L. Pape; P. Bosetti
In a selected sample of 6770 charged current (CC) events of νp interactions with 〈Eν〉 = 43 GeV and 〈W〉 = 4.6 GeV, 359 K0, 180 Λ and 13 Λ have been observed, which corresponds to a corrected production rate at least one neutral strange particle in (17.4±0.8)% of the CC events. The ratio of the inclusive Λ to K0 production cross section is found to be 0.26±0.03. The number of CC events containing at least one K0 increases with increasing Eν and Q2, while the CC events containing at least one Λ remain practically constant. The fractions of the total hadronic energy carried by K0 and Λ are found to be approximately the same in νp as in ep and μp interactions. In the hadronic c.m.s., the K0 are produced mostly forwards, the Λ mostly backwards, with asymmetry parameters of +0.32±0.02 and −0.45±0.06, respectively. The total strange particle production cross section is estimated to be (25±4)% of the cross section for production of CC events with W>1.5 GeV and that for charm production (10±2)% of the CC cross section well above charm threshold (W>3 GeV). The production of the resonances K∗+ (890) and Σ+ (1385) has been observed. The production rate of K∗+ (890) is comparable to that of D∗+ (2009), above the corresponding thresholds.
Physics Letters B | 1979
J. Blietschau; H. Grässler; W. Krenz; D. Lanske; R. Schulte; H.H. Seyfert; K. Böckmann; P. Checchia; C. Geich-Gimbel; H.G. Heilmann; T. P. Kokott; B. Nellen; R. Pech; L. Bacci; P. Bosetti; D. Cundy; A. Grant; P.O. Hulth; D.R.O. Morrison; R. Orava; L. Pape; Ch. Peyrou; H. Saarikko; W.G. Scott; E. Simopoulou; A. Vayaki; H. Wachsmuth; M. Aderholz; N. Schmitz; R. Settles
Abstract An analysis is presented of the z distributions of secondary hadrons produced in 5600 charged current events from a BEBC neutrino-hydrogen experiment. Evidence is presented for scaling deviations in the z distributions and a breakdown of factorization in the single particle inclusive cross sections. The results are consistent with the leading order QCD predictions on the q 2 dependence of nonsinglet moments of quark fragmentation functions, yielding a value of Λ ≈ 0.6 GeV.
Physics Letters B | 1975
H. Deden; F.J. Hasert; W. Krenz; J. von Krogh; D. Lanske; J. Morfin; M. Pohl; K. Schultze; H. Weerts; G. Bertrand-Coremans; M. Goossens; H. Mulkens; J. Sacton; W. Van Doninck; P. Vilain; H. Burmeister; D. Cundy; D. Haidt; A. Lloret; P. Musset; J.B.M. Pattison; D.H. Perkins; F. Romano; A. Rousset; H. Wachsmuth; L. Behr; V. Brisson; A. Comtet; B. Degrange; M. Haguenauer
Abstract Data is given for single and multiple strange particle production in neutrino reactions in both charged and neutral current channels. A total of 15000 neutrino and antineutrino events has been examined for possible evidence of semi-leptonic decay of a charmed particle. One candidate has been observed. Upper limits on charmed particle production cross-sections are given as a function of the neutrino energy and the invariant mass of the final state hadrons.
