Lifetime measurement of charm mesons produced in π−p and pp interactions at 360 GeV/c

M. Aguilar-Benitez,W.W. Allison,P. Bagnaia,J. Baland,L. Barone,W. Bartl,G. Bertrand-Coremans,A. Bettini,R. Bizzarri,M. Boratav,G. Borreani,F. Bruyant,E. Castelli,D. Cauz,P. Checchia,P.V. Chliapnikov,G. Ciapetti,D. Crennell,H. Dibon,E. Di Capua,C. Dionisi,J. Dolbeau,J. Duboc,J. Dumarchez,F. Etienne,A. Ferrando,C. Fisher,Yu.V. Fisjak,R. Frühwirth,U. Gasparini,S. Gentile,P. Girtler,F. Grard,F. Hartjes,J. Hernandez,P. Herquet,S.O. Holmgren,J. Hrubec,P.T. Hughes,K.E. Johansson,A.G. Kholodenko,E.P. Kistenev,N. Kurtz,P.Ladron De Guevara,H. Leutz,P. Loverre,M. MacDermott,F. Marchetto,F. Marzano,A. Michalon,M.E. Michalon-Mentzer,T. Moa,L. Montanet,G. Neuhofer,H. Nguyen,S. Nilsson,L. Peruzzo,P. Pilette,C. Pinori,G. Piredda,A. Poppleton,P. Poropat,P. Porth,S. Reucroft,J. Richardson,G. Rinaudo,L. Robb,H. Rohringer,P. Rossi,G. Sartori,M. Sessa,R. Settles,A. Stergiou,V.A. Stopchenko,A. Subramanian,D. Toet,M.C. Touboul,A.M. Touchard,C. Troncon,M. Van Immerseel,L. Ventura,P. Vilain,J. Wickens,P. Wright,T.P. Yiou,D. Zanello,L. Zanello,P. Zotto,G. Zumerle,LEBC-EHS Collaboration; M. Aguilar-Benitez; W.W. Allison; P. Bagnaia; J. Baland; L. Barone; W. Bartl; G. Bertrand-Coremans; A. Bettini; R. Bizzarri; M. Boratav; G. Borreani; F. Bruyant; E. Castelli; D. Cauz; P. Checchia; P.V. Chliapnikov; G. Ciapetti; D. Crennell; H. Dibon; E. Di Capua; C. Dionisi; J. Dolbeau; J. Duboc; J. Dumarchez; F. Etienne; A. Ferrando; C. Fisher; Yu.V. Fisjak; R. Frühwirth; U. Gasparini; S. Gentile; P. Girtler; F. Grard; F. Hartjes; J. Hernandez; P. Herquet; S.O. Holmgren; J. Hrubec; P.T. Hughes; K.E. Johansson; A.G. Kholodenko; E.P. Kistenev; N. Kurtz; P.Ladron De Guevara; H. Leutz; P. Loverre; M. MacDermott; F. Marchetto; F. Marzano; A. Michalon; M.E. Michalon-Mentzer; T. Moa; L. Montanet; G. Neuhofer; H. Nguyen; S. Nilsson; L. Peruzzo; P. Pilette; C. Pinori; G. Piredda; A. Poppleton; P. Poropat; P. Porth; S. Reucroft; J. Richardson; G. Rinaudo; L. Robb; H. Rohringer; P. Rossi; G. Sartori; M. Sessa; R. Settles; A. Stergiou; V.A. Stopchenko; A. Subramanian; D. Toet; M.C. Touboul; A.M. Touchard; C. Troncon; M. Van Immerseel; L. Ventura; P. Vilain; J. Wickens; P. Wright; T.P. Yiou; D. Zanello; L. Zanello; P. Zotto; G. Zumerle; LEBC-EHS Collaboration

Lifetime measurement of charm mesons produced in π−p and pp interactions at 360 GeV/c

M. Aguilar-Benitez,W.W. Allison,P. Bagnaia,J. Baland,L. Barone,W. Bartl,G. Bertrand-Coremans,A. Bettini,R. Bizzarri,M. Boratav,G. Borreani,F. Bruyant,E. Castelli,D. Cauz,P. Checchia,P.V. Chliapnikov,G. Ciapetti,D. Crennell,H. Dibon,E. Di Capua,C. Dionisi,J. Dolbeau,J. Duboc,J. Dumarchez,F. Etienne,A. Ferrando,C. Fisher,Yu.V. Fisjak,R. Frühwirth,U. Gasparini,S. Gentile,P. Girtler,F. Grard,F. Hartjes,J. Hernandez,P. Herquet,S.O. Holmgren,J. Hrubec,P.T. Hughes,K.E. Johansson,A.G. Kholodenko,E.P. Kistenev,N. Kurtz,P.Ladron De Guevara,H. Leutz,P. Loverre,M. MacDermott,F. Marchetto,F. Marzano,A. Michalon,M.E. Michalon-Mentzer,T. Moa,L. Montanet,G. Neuhofer,H. Nguyen,S. Nilsson,L. Peruzzo,P. Pilette,C. Pinori,G. Piredda,A. Poppleton,P. Poropat,P. Porth,S. Reucroft,J. Richardson,G. Rinaudo,L. Robb,H. Rohringer,P. Rossi,G. Sartori,M. Sessa,R. Settles,A. Stergiou,V.A. Stopchenko,A. Subramanian,D. Toet,M.C. Touboul,A.M. Touchard,C. Troncon,M. Van Immerseel,L. Ventura,P. Vilain,J. Wickens,P. Wright,T.P. Yiou,D. Zanello,L. Zanello,P. Zotto,G. Zumerle,LEBC-EHS Collaboration;M. Aguilar-Benitez;W.W. Allison;P. Bagnaia;J. Baland;L. Barone;W. Bartl;G. Bertrand-Coremans;A. Bettini;R. Bizzarri;M. Boratav;G. Borreani;F. Bruyant;E. Castelli;D. Cauz;P. Checchia;P.V. Chliapnikov;G. Ciapetti;D. Crennell;H. Dibon;E. Di Capua;C. Dionisi;J. Dolbeau;J. Duboc;J. Dumarchez;F. Etienne;A. Ferrando;C. Fisher;Yu.V. Fisjak;R. Frühwirth;U. Gasparini;S. Gentile;P. Girtler;F. Grard;F. Hartjes;J. Hernandez;P. Herquet;S.O. Holmgren;J. Hrubec;P.T. Hughes;K.E. Johansson;A.G. Kholodenko;E.P. Kistenev;N. Kurtz;P.Ladron De Guevara;H. Leutz;P. Loverre;M. MacDermott;F. Marchetto;F. Marzano;A. Michalon;M.E. Michalon-Mentzer;T. Moa;L. Montanet;G. Neuhofer;H. Nguyen;S. Nilsson;L. Peruzzo;P. Pilette;C. Pinori;G. Piredda;A. Poppleton;P. Poropat;P. Porth;S. Reucroft;J. Richardson;G. Rinaudo;L. Robb;H. Rohringer;P. Rossi;G. Sartori;M. Sessa;R. Settles;A. Stergiou;V.A. Stopchenko;A. Subramanian;D. Toet;M.C. Touboul;A.M. Touchard;C. Troncon;M. Van Immerseel;L. Ventura;P. Vilain;J. Wickens;P. Wright;T.P. Yiou;D. Zanello;L. Zanello;P. Zotto;G. Zumerle;LEBC-EHS Collaboration;

physics letters b 1983 Vol. 122 pp. 312-316

189

collaboration1983physicslifetime

Abstract

Results are presented on charm meson lifetimes. The sample of charm particle decays was obtained by exposing the high resolution rapid cycling hydrogen bubble chamber (LEBC) coupled with the European Hybrid Spectrometer to π− and p beams at 360 GeV/c ffrom the CERN SPS. The analysis of ∼850 k pictures has yielded 77 events containing a total of 60 charm decays. From these, an unbiased sample of 31 D decays (15± and 16 D0) is issued in the lifetime analysis. The measured mean lifetimes for D± and D0 are (where the symbol D0 means D0 and D0):τ(D±)=8.4+3.5−2.2 × 10−13sτ(D0)=4.1+1.3−0.9 ×10−13s. Three unambiguous examples of F± decay have also been observed and the corresponding lifetime, based on 2 decays, is τ(F±)=2.1 +3.6−0.8 × 10 −13s

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high resolution particle physics

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10.1016/0370-2693(83)90710-4

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