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European Physical Journal A | 1983

ExperimentalJ/ψ hadronic production from 150 to 280 GeV/c

J. Badier; J. Boucrot; J. Bourotte; G. Burgun; O. Callot; Ph. Charpentier; M. Crozon; D. Decamp; P. Delpierre; B. Gandois; R. Hagelberg; M. Hansroul; Y. Karyotakis; W. Kienzle; P. Le Du; J. Lefrancois; Th. Leray; J. Maillard; A. Michelini; P. Miné; G. Rahal; O. Runolfsson; P. Siegrist; A. Tilquin; J. Timmermans; J. Valentin; S. Weisz

A detailed study ofJ/ψ hadronic production has been performed in a high statistics experiment (more than 1.5 106J/ψ observed in their dimuon decay mode). Data have been taken with incident π±,K±,p±, on hydrogen and platinum targets, at 150, 200 and 280 GeV/c. We find from the observed nuclear dependance of the cross sections, that about 18% of theJ/ψ are produced diffractively. Using known structure functions of the quarks in the nucleon and in the pion, we derive estimations for the gluon structure functions.


Physics Letters B | 1980

Experimental determination of the antiproton structure function by the Drell-Yan mechanism

J. Badier; J. Boucrot; J. Bourotte; G. Burgun; O. Callot; Ph. Charpentier; M. Crozon; D. Decamp; P. Delpierre; A Diop; Ravindra Kumar Dube; P. Espigat; B. Gandois; R. Hagelberg; M. Hansroul; Y. Karyotakis; W. Kienzle; A. Lafontaine; P. Le Duˆ; J. Lefranç¸ois; Th. Leray; J. Maillard; G. Matthiae; A. Michelini; P. Miné; G. Rahal; O. Runolfsson; P. Siegrist; A. Tilquin; J. Timmermans

Abstract We present results on the measurement of the Drell-Yan absolute cross section and of the shape of the nucleon structure functions by the analysis of massive dimuon events produced by antiprotons at 150 GeV and by protons at 150 and 200 GeV. Good agreement is found with the results of the neutrino deep inelastic scattering (DIS) experiments, for the shape of the valence structure function. The measured cross section however, when compared to the model predictions assuming the DIS nucleon structure function exhibits a normalization factor K = 2.3 ± 0.4.


European Physical Journal C | 1986

Mass and lifetime limits on new long-lived particles in 300 GeV/c π− interactions

J. Badier; C. Bemporad; J. Boucrot; O. Callot; Philippe Charpentier; A. M. Cnops; M. Crozon; P. Delpierre; J. F. Detoeuf; G. Giannini; R. Hammarström; P. Lariccia; R. Lorenzi; J. Mas; A. Michelini; A. Tilquin; J. K. Walker

A sensitive search has been done for the production of new long-lived and penetrating particles by 300 GeV/c negative pions. No new state —decaying into at least two charged known particles —has been detected with mass above 1 GeV/c2 and lifetime in the range 5·10−11 s to 5·10−7s. We give upper limits on production cross sections, and consequences on the existence of heavy “axion-like” particles, heavy neutrinos and supersymmetric particles. In particular, this experiment excludes the existence of light gluinos with lifetime in the range 5·10−11 to 10−8s: this closes the last “window of opportunity” for gluinos withM<2 GeV/c2 and lifetime measurable in particle physics experiments.


Physics Letters B | 1983

Production of low mass dimuons at high transverse momentum: Study of ϱ, ω, π resonances

J. Badier; J. Boucrot; J. Bourotte; G. Burgun; O. Callot; Ph. Charpentier; M. Crozon; D. Decamp; P. Delpierre; B. Gandois; R. Hagelberg; M. Hansroul; Y. Karyotakis; W. Kienzle; P. Le Du; J Lefrancois; Th. Leray; J. Maillard; A. Michelini; P. Miné; G. Rahal; O. Runolfsson; P. Siegrist; A. Tilquin; J. Valentin; R. Vanderhaghen; S. Weisz

Abstract We use low mass dimuons (0.35 M μμ ⩽ 2 GeV/ c 2 ) to analyse the production at high transverse momentum ( P T ⩾ 2 GeV/ c ) of the resonances ϱ, ω, π. We have studied the variation of the cross section with the type of incident particle (π, K, p) at 150, 200, 280 GeV/ c and the nuclear effects by comparison of platinum and hydrogen targets. There is no significant difference between the slopes of the transverse momentum distributions with those observed at lower P T (0 P T c ), meanwhile x F -distributions show a leading effect in the production of gf by kaons at these relatively high transverse momenta.


IEEE Transactions on Nuclear Science | 1991

Design and performance of the DELPHI data acquisition system

W. Adam; T. Adye; J.N. Albert; L. Beneteau; B. Bouquet; J. Buytaert; T. Camporesi; L. Cerrito; Ph. Charpentier; M. Donszelmann; B. Franek; J. Fuster; C. Gaspar; Ph. Gaville; P. Giacomelli; G. Gopal; G. Goujon; A. Grant; M. Gros; L. Guglielmi; F.J. Harris; J. Javello; J.M. Brunet; M. Jonker; J.P. Laugierg; H. Lebbolo; J. Loken; R.M.A. Lucock; Y. Miere; P. Moreau

The data acquisition system of the DELPHI experiment at LEP allows the recording of data from the front-end electronics of 15 different detectors housed in about 100 Fastbus crates. Each detector has the possibility of monitoring its data in parallel with the global data acquisition as well as of running in a stand-alone mode. A description is presented of the design of the system and the performance achieved so far. Emphasis is given to the readout system, and an overview is provided of the systems for control and monitoring. >


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1986

Measurement of punch-through particle fluxes from a 200 cm long beam dump hit by a 300 gev/c pion beam

J. Badier; C. Bemporad; J. Boucrot; O. Callot; Ph. Charpentier; A. M. Cnops; M. Crozon; P. Delpierre; J. F. Detoeuf; G. Giannini; R. Hammarström; P. Lariccia; R. Lorenzi; J. Mas; A. Michelini; A. Tilquin; J.K. Walker

Abstract We present a measurement of the particle flux punching through tungsten and iron beam dumps; the NA3 spectrometer was used. Momentum spectra and spatial distributions were determined for pions above GeV/ c and for strange particles (K ± , K s 0 , Λ , Ξ ; 15 p c ). Information on the effective attenuation length for strange particles was obtained by comparing the results from dumps of different lengths (200 and 220 cm).


High Energy Physics-1980: 20th International Conference, Madison, Wisconsin | 1981

High statistics study (∠106 events) of J/ψ production and T production in the energy range 150 to 280 GeV by π±, p± incident particle

J. Badier; J. Boucrot; J. Bourotte; G. Burgun; O. Callot; Ph. Charpentier; M. Crozon; D. Decamp; P. Delpierre; A Diop; Ravindra Kumar Dube; P. Espigat; B. Gandois; R. Hagelberg; M. Hansroul; J. Karyotakis; W. Kienzle; A. Lafontaine; P. Le Du; J. Lefrancois; Th. Leray; J. Maillard; G. Matthiae; A. Michelini; P. Miné; H. Nguyen Ngoc; G. Rahal; O. Runolfsson; P. Siegrist; A. Tilquin

We have performed in the NA3 experiment the study of high mass dimuon production by a hadronic unseparated beam on hydrogen and platinum targets. The comparison of the production cross‐section for proton and antiproton together with the differential cross‐section dσ/dx allows us to compare the data with a production mechanism involving quark‐antiquark and gluon‐gluon interactions. The cosΘ* distribution of the same J/ψ data have also been analysed and results will be presented. Finally we have observed T production from 150 GeV/c incident pions.


AIP Conference Proceedings Volume 68 | 1981

High statistics study (∠10

J. Badier; J. Boucrot; J. Bourotte; G. Burgun; O. Callot; Ph. Charpentier; M. Crozon; D. Decamp; P. Delpierre; A Diop; Ravindra Kumar Dube; P. Espigat; B. Gandois; R. Hagelberg; M. Hansroul; J. Karyotakis; W. Kienzle; A. Lafontaine; P. Le Du; J. Lefrançois; Th. Leray; J. Maillard; G. Matthiae; A. Michelini; P. Miné; H. Nguyen Ngoc; G. Rahal; O. Runolfsson; P. Siegrist; A. Tilquin

We have performed in the NA3 experiment the study of high mass dimuon production by a hadronic unseparated beam on hydrogen and platinum targets. The comparison of the production cross‐section for proton and antiproton together with the differential cross‐section dσ/dx allows us to compare the data with a production mechanism involving quark‐antiquark and gluon‐gluon interactions. The cosΘ* distribution of the same J/ψ data have also been analysed and results will be presented. Finally we have observed T production from 150 GeV/c incident pions.


Physics Letters B | 1985

SEARCH FOR LONGLIVED AND PENETRATING NEW PARTICLES IN 300-GeV/c pi- INTERACTIONS

J. Badier; A. Tilquin; M. Crozon; A. Michelini; A.M. Cnops; P. Delpierre; P Lariccia; J.F. Detoeuf; R. Hammarström; R. Lorenzi; C. Bemporad; G. Giannini; J. Mas; Philippe Charpentier; O. Callot; J.K. Walker; J. Boucrot


Archive | 1984

Direct photon production from negative and positive pions and protons at 200 GeV/c

J. Badier; M. Bardadin-Otwinowska; C. Bemporad; U Berthon; H Bienvenu; J. Boucrot; J. Bourotte; G. Burgun; O. Callot; Ph. Charpentier; A. M. Cnops; Michael Cohen; F. Costantini; M. Crozon; D. Decamp; P. Delpierre; J. F. Detoeuf; P. Espigat; B. Gandois; Gianluca Giannini; V. Hajjar; M. Hansroul; Yu Karyotakis; P. Lariccia; P. Le Du; J. Lefrancois; Th. Leray; Jordi Sole i Mas; A. Michelini; G. C. Moneti

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P. Delpierre

Aix-Marseille University

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