R. Engelmann
CERN
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by R. Engelmann.
Physics Letters B | 1984
P. Bagnaia; W. Zeller; M. Borghini; R. Mollerud; F. Pastore; P. Hansen; V. Vercesi; J.M. Gaillard; B. Mansoulie; J. Bürger; J. Teiger; C. Gössling; K. Borer; R. Engelmann; H. Zaccone; G. Sauvage; P. Mani; P. Jenni; V.G. Goggi; G. Stimpfl; Janusz Andrzej Zakrzewski; T. Himel; J.C. Chollet; A. Rothenberg; J.L. Siegrist; M Livan; C. Onions; S. Loucatos; B. Madsen; P. Bloch
Abstract Using a sample of events collected by UA2 and corresponding to an integrated luminosity of 116 nb −1 . we have searched for electron-“neutrino” pairs in which the transverse momenta of the electron and of the “neutrino” exceed 15 GeV/c and 25 GeV/c respectively. A total of 35 events are observed in low background conditions. Most events can be interpreted in terms of W ± production from QCD processes. Events in which the observation of hard jets makes this interpretation unlikely are described in detail. Possible sources of background contamination are considered.
Physics Letters B | 1985
J. A. Appel; M. Banner; E. Lançon; S. Loucatos; B. Mansoulie; M. Polverel; A. Roussarie; V. Ruhlmann; J. Teiger; H. Zaccone; P. Bagnaia; M. Borghini; A.G. Clark; P. Darriulat; L. Di Lella; K. Einsweiler; R. Engelmann; O. Gildemeister; C. Goessling; John Renner Hansen; P. Hansen; N. Harnew; T. Himel; P. Jenni; L. Mapelli; K. Meier; C. Onions; A. Rothenberg; M. Swartz; S.N. Tovey
Abstract The production of very large transverse momentum ( p T ) hadron jets has been measured in the UA2 experiment at the CERN p p Collider for s =630 GeV . The inclusive jet production cross sections exhibit a p T -dependent increase with respect to the s =546 GeV data from previous Collider runs. This increase can be described both by QCD calculations and by approximate x T =2 p T /√ s scaling. No significant deviation of the data from QCD predictions is observed at very large p T , placing a lower limit on the characteristic scale Λ c of a hypothetical superstrong contact interaction responsible for the binding of preons in the quark ( Λ c >370 GeV at 95% CL).
Physics Letters B | 1985
J. A. Appel; G. Carboni; E.-E. Kluge; P. Cenci; M. Borghini; R. Mollerud; C. Gössling; P. H. Hansen; V. Vercesi; M. Fraternali; A. Putzer; B. Mansoulie; K. Einsweiler; Antonio Codino; J. Teiger; M. Banner; M. Schlotelburg; S.N. Tovey; K. Borer; R. Engelmann; M. Moniez; G. Sauvage; L. Iconomidou-Fayard; P. Mani; K. Tittel; P. Jenni; P. Bagnaia; V.G. Goggi; M. Valdata-Nappi; N. Harnew
Abstract The production of very large transverse momentum ( p T ) hadron jets has been measured in the UA2 experiment at the CERN p p Collider for s =630 GeV . The inclusive jet production cross sections exhibit a p T -dependent increase with respect to the s =546 GeV data from previous Collider runs. This increase can be described both by QCD calculations and by approximate x T =2 p T /√ s scaling. No significant deviation of the data from QCD predictions is observed at very large p T , placing a lower limit on the characteristic scale Λ c of a hypothetical superstrong contact interaction responsible for the binding of preons in the quark ( Λ c >370 GeV at 95% CL).
Physics Letters B | 1986
J. A. Appel; P. Bagnaia; M. Banner; R. Battiston; K. Bernlöhr; K. Borer; M. Borghini; G. Carboni; V. Cavasinni; P. Cenci; J.C. Chollet; A.G. Clark; C. Conta; Pierre Darriulat; B. De Lotto; T. Del Prete; L. DiLella; J. Dines-Hansen; K. Einsweiler; R. Engelmann; L. Fayard; M. Fraternali; D. Froidevaux; J.-M. Gaillard; O. Gildemeister; V.G. Goggi; C. Gössling; B. Hahn; H. Hänni; John Renner Hansen
Abstract Using the UA2 apparatus, the inclusive cross section has been measured for production of high- p T direct photons in pp collisions at s =546 GeV and s =630 GeV . The results are in good agreement with QCD predictions.
Physics Letters B | 1984
P. Bagnaia; W. Zeller; M. Borghini; R. Mollerud; F. Pastore; P. Hansen; V. Vercesi; J.M. Gaillard; B. Mansoulie; J. Bürger; J. Teiger; C. Gössling; K. Borer; R. Engelmann; H. Zaccone; G. Sauvage; P. Mani; P. Jenni; V.G. Goggi; G. Stimpfl; Janusz Andrzej Zakrzewski; T. Himel; J.C. Chollet; A. Rothenberg; J.L. Siegrist; M Livan; C. Onions; S. Loucatos; B. Madsen; P. Bloch
Abstract The production of very large transverse momentum hadron jets has been measured in the UA2 experiment at the CERN p p Collider for s = 540 GeV using a highly segmented calorimeter. The range of previously available cross sections for inclusive jet production is extended to pT = 150 GeV and the two-jet invariant mass distribution to mjj = 280 GeV with the largely increased data sample collected during the 1983 running period. The results are compared with the predictions of QCD models.
Physics Letters B | 1986
J. A. Appel; G. Carboni; E.-E. Kluge; P. Cenci; M. Borghini; R. Mollerud; C. Gössling; P. H. Hansen; V. Vercesi; M. Fraternali; M. Schlotelburg; B. Mansoulie; K. Einsweiler; G. Parrour; J. Teiger; M. Banner; S.N. Tovey; K. Borer; R. Engelmann; K. Jakobs; G. Sauvage; L. Iconomidou-Fayard; P. Mani; P. Jenni; P. Bagnaia; V.G. Goggi; M. Valdata-Nappi; N. Harnew; Michael Andrew Parker; Konrad Bernlohr
Abstract Using the UA2 apparatus, the inclusive cross section has been measured for production of high- p T direct photons in pp collisions at s =546 GeV and s =630 GeV . The results are in good agreement with QCD predictions.
European Physical Journal C | 1986
J. A. Appel; P. Bagnaia; M. Banner; R. Battiston; K. Bernlöhr; K. Borer; M. Borghini; G. Carboni; V. Cavasinni; P. Cenci; J.C. Chollet; A.G. Clark; Antonio Codino; C. Conta; P. Darriulat; B. De Lotto; T. Del Prete; L. Di Lella; J. Dines-Hansen; K. Einsweiler; R. Engelmann; L. Fayard; M. Fraternali; D. Froidevaux; J.M. Gaillard; O. Gildemeister; V.G. Goggi; C. Gössling; B. Hahn; H. Hänni
AbstractA study ofW± andZ0 properties has been performed using the UA2 detector at then
European Physical Journal A | 1986
J. A. Appel; P. Bagnaia; M. Banner; R. Battiston; K. Bernlöhr; K. Borer; M. Borghini; J. Bürger; G. Carboni; V. Cavasinni; P. Cenci; J.C. Chollet; A.G. Clark; Antonio Codino; C. Conta; P. Darriulat; B. De Lotto; T. Del Prete; L. Di Lella; J. Dines-Hansen; K. Einsweiler; R. Engelmann; L. Fayard; M. Fraternali; D. Froidevaux; J.M. Gaillard; O. Gildemeister; V.G. Goggi; C. Gössling; B. Hahn
Physics Letters B | 1984
P. Bagnaia; M. Banner; R. Battiston; Ph. Bloch; K. Borer; M. Borghini; J. Bürger; P. Cenci; J.C. Chollet; A.G. Clark; C. Conta; P. Darriulat; L. Di Lella; J. Dines-Hansen; R. Engelmann; L. Fayard; M. Fraternali; D. Froidevaux; J.M. Gaillard; O. Gildemeister; V.G. Goggi; C. Gössling; B. Hahn; H. Hänni; John Renner Hansen; P. Hansen; N. Harnew; T. Himel; P. Jenni; O. Kofoed-Hansen
bar pp
European Physical Journal A | 1984
P. Bagnaia; M. Banner; R. Battiston; Ph. Bloch; Franco Bonaudi; K. Borer; M. Borghini; J. Bürger; P. Cenci; J.C. Chollet; A.G. Clark; C. Conta; P. Darriulat; L. Di Lella; J. Dines-Hansch; P.-A. Dorsaz; R. Engelmann; L. Fayard; M. Fraternali; D. Froidevaux; G. Fumagalli; J.M. Gaillard; O. Gildemeister; V.G. Goggi; C. Gössling; B. Hahn; H. Hänni; John Renner Hansen; P. Hansen; N. Harnew
