The ALEPH detector at LEP is used to study single photon events in e+e- collisions at the Z resonance. In a total data sample of 15.7 pb-1 taken in 1990 and 1991 scanning the resonance, 400 events were recorded where each has a single deposition of more than 1.5 GeV measured in the polar angular region \costheta(gamma)\ < 0.74 of the electromagnetic calorimeter. It is shown that this number of events can be accounted for by known processes. After subtraction of background events, the invisible width of the Z is determined to be 450 +/- 34(stat.) +/- 34(syst.) MeV. Using Z resonance parameters derived by ALEPH, the corresponding number of light neutrino generations is found to be 2.68 +/- 0.20(stat.) +/- 0.20(syst.).

A Direct Measurement of the Invisible Width of the Z From Single-photon Counting / D. BUSKULIC;I. DEBONIS;D. DECAMP;P. GHEZ;C. GOY;J. P. LEES;M. N. MINARD;B. PIETRZYK;F. ARIZTIZABAL;P. COMAS;J. M. CRESPO;M. DELFINO;I. EFTHYMIOPOULOS;E. FERNANDEZ;M. FERNANDEZBOSMAN;V. GAITAN;L. GARRIDO;T. MATTISON;A. PACHECO;C. PADILLA;A. PASCUAL;D. CREANZA;M. DEPALMA;A. FARILLA;G. IASELLI;G. MAGGI;S. NATALI;S. NUZZO;M. QUATTROMINI;A. RANIERI;G. RASO;F. ROMANO;F. RUGGIERI;G. SELVAGGI;L. SILVESTRIS;P. TEMPESTA;G. ZITO;Y. CHAI;H. HU;D. HUANG;X. HUANG;J. LIN;T. WANG;Y. XIE;D. XU;R. XU;J. ZHANG;L. ZHANG;W. ZHAO;E. BLUCHER;G. BONVICINI;J. BOUDREAU;D. CASPER;H. DREVERMANN;R. W. FORTY;G. GANIS;C. GAY;R. HAGELBERG;J. HARVEY;J. HILGART;R. JACOBSEN;B. JOST;J. KNOBLOCH;I. LEHRAUS;T. LOHSE;M. MAGGI;C. MARKOU;M. MARTINEZ;P. MATO;H. MEINHARD;A. MINTEN;A. MIOTTO;R. MIQUEL;H. G. MOSER;P. PALAZZI;J. R. PATER;J. A. PERLAS;J. F. PUSZTASZERI;F. RANJARD;G. REDLINGER;L. ROLANDI;J. ROTHBERG;T. RUAN;M. SAICH;D. SCHLATTER;M. SCHMELLING;F. SEFKOW;W. TEJESSY;I. R. TOMALIN;R. VEENHOF;H. WACHSMUTH;S. WASSERBAECH;W. WIEDENMANN;T. WILDISH;W. WITZELING;J. WOTSCHACK;Z. AJALTOUNI;F. BADAUD;M. BARDADINOTWINOWSKA;R. ELFELLOUS;A. FALVARD;P. GAY;C. GUICHENEY;P. HENRARD;J. JOUSSET;B. MICHEL;J. C. MONTRET;D. PALLIN;P. PERRET;F. PODLYSKI;J. PRORIOL;F. PRULHIERE;F. SAADI;T. FEARNLEY;J. B. HANSEN;J. D. HANSEN;J. R. HANSEN;P. H. HANSEN;R. MOLLERUD;B. S. NILSSON;A. KYRIAKIS;E. SIMOPOULOU;I. SIOTIS;A. VAYAKI;K. ZACHARIADOU;J. BADIER;A. BLONDEL;G. BONNEAUD;J. C. BRIENT;G. FOUQUE;S. ORTEU;A. ROUGE;M. RUMPF;R. TANAKA;M. VERDERI;H. VIDEAU;D. J. CANDLIN;M. I. PARSONS;E. VEITCH;E. FOCARDI;L. MONETA;G. PARRINI;M. CORDEN;C. GEORGIOPOULOS;M. IKEDA;D. LEVINTHAL;A. ANTONELLI;R. BALDINI;G. BENCIVENNI;G. BOLOGNA;F. BOSSI;P. CAMPANA;G. CAPON;F. CERUTTI;V. CHIARELLA;B. DETTORREPIAZZOLI;G. FELICI;P. LAURELLI;G. MANNOCCHI;F. MURTAS;G. P. MURTAS;L. PASSALACQUA;M. PEPEALTARELLI;P. PICCHI;P. COLRAIN;I. TENHAVE;J. G. LYNCH;W. MAITLAND;W. T. MORTON;C. RAINE;P. REEVES;J. M. SCARR;K. SMITH;M. G. SMITH;A. S. THOMPSON;R. M. TURNBULL;B. BRANDL;O. BRAUN;C. GEWENIGER;P. HANKE;V. HEPP;E. E. KLUGE;Y. MAUMARY;A. PUTZER;B. RENSCH;A. STAHL;K. TITTEL;M. WUNSCH;R. BEUSELINCK;D. M. BINNIE;W. CAMERON;M. CATTANEO;D. J. COLLING;P. J. DORNAN;A. M. GREENE;J. F. HASSARD;N. M. LIESKE;A. MOUTOUSSI;J. NASH;S. PATTON;D. G. PAYNE;M. J. PHILLIPS;G. SANMARTIN;J. K. SEDGBEER;A. G. WRIGHT;P. GIRTLER;D. KUHN;G. RUDOLPH;R. VOGL;C. K. BOWDERY;T. J. BRODBECK;A. J. FINCH;F. FOSTER;G. HUGHES;D. JACKSON;N. R. KEEMER;M. NUTTALL;A. PATEL;T. SLOAN;S. W. SNOW;E. P. WHELAN;K. KLEINKNECHT;J. RAAB;B. RENK;H. G. SANDER;H. SCHMIDT;F. STEEG;S. M. WALTHER;R. WANKE;B. WOLF;A. M. BENCHEIKH;C. BENCHOUK;A. BONISSENT;J. CARR;P. COYLE;J. DRINKARD;F. ETIENNE;D. NICOD;S. PAPALEXIOU;P. PAYRE;L. ROOS;D. ROUSSEAU;P. SCHWEMLING;M. TALBY;S. ADLUNG;R. ASSMANN;C. BAUER;W. BLUM;D. BROWN;P. CATTANEO;B. DEHNING;H. DIETL;F. DYDAK;M. FRANK;A. W. HALLEY;K. JAKOBS;J. LAUBER;G. LUTJENS;G. LUTZ;W. MANNER;R. RICHTER;J. SCHRODER;A. S. SCHWARZ;R. SETTLES;H. SEYWERD;U. STIERLIN;U. STIEGLER;R. STDENIS;G. WOLF;R. ALEMANY;J. BOUCROT;O. CALLOT;A. CORDIER;M. DAVIER;L. DUFLOT;J. F. GRIVAZ;P. HEUSSE;D. E. JAFFE;P. JANOT;D. W. KIM;F. LEDIBERDER;J. LEFRANCOIS;A. M. LUTZ;M. H. SCHUNE;J. J. VEILLET;I. VIDEAU;Z. ZHANG;D. ABBANEO;G. BAGLIESI;G. BATIGNANI;U. BOTTIGLI;C. BOZZI;G. CALDERINI;M. CARPINELLI;M. A. CIOCCI;V. CIULLI;R. DELLORSO;I. FERRANTE;F. FIDECARO;L. FOA;F. FORTI;A. GIASSI;M. A. GIORGI;A. GREGORIO;F. LIGABUE;A. LUSIANI;E. B. MANNELLI;P. S. MARROCCHESI;A. MESSINEO;F. PALLA;G. RIZZO;G. SANGUINETTI;P. SPAGNOLO;J. STEINBERGER;R. TENCHINI;G. TONELLI;G. TRIGGIANI;A. VALASSI;C. VANNINI;A. VENTURI;P. G. VERDINI;J. WALSH;A. P. BETTERIDGE;Y. GAO;M. G. GREEN;P. V. MARCH;L. M. MIR;T. MEDCALF;I. S. QUAZI;J. A. STRONG;L. R. WEST;D. R. BOTTERILL;R. W. CLIFFT;T. R. EDGECOCK;S. HAYWOOD;P. R. NORTON;J. C. THOMPSON;B. BLOCHDEVAUX;P. COLAS;H. DUARTE;S. EMERY;W. KOZANECKI;E. LANCON;M. C. LEMAIRE;E. LOCCI;B. MARX;P. PEREZ;J. RANDER;J. F. RENARDY;A. ROSOWSKY;A. ROUSSARIE;J. P. SCHULLER;J. SCHWINDLING;D. S. MOHAND;B. VALLAGE;R. P. JOHNSON;A. M. LITKE;G. TAYLOR;J. WEAR;J. G. ASHMAN;W. BABBAGE;C. N. BOOTH;C. BUTTAR;S. CARTWRIGHT;F. COMBLEY;I. DAWSON;L. F. THOMPSON;E. BARBERIO;A. BOHRER;S. BRANDT;G. COWAN;C. GRUPEN;G. LUTTERS;F. RIVERA;U. SCHAFER;L. SMOLIK;L. BOSISIO;R. DELLAMARINA;G. GIANNINI;B. GOBBO;F. RAGUSA;L. BELLANTONI;W. CHEN;J. S. CONWAY;Z. FENG;D. P. S.;Y. S. GAO;J. GRAHL;J. L. HARTON;O. J. HAYES;J. M. NACHTMAN;Y. B. PAN;Y. SAADI;M. SCHMITT;I. SCOTT;V. SHARMA;Z. H. SHI;J. D. TURK;A. M. WALSH;F. V. WEBER;S. L. WU;X. WU;M. ZHENG;G. ZOBERNIG. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 313:(1993), pp. 520-534. [10.1016/0370-2693(93)90027-F]

A Direct Measurement of the Invisible Width of the Z From Single-photon Counting

FOCARDI, ETTORE;CIULLI, VITALIANO;
1993

Abstract

The ALEPH detector at LEP is used to study single photon events in e+e- collisions at the Z resonance. In a total data sample of 15.7 pb-1 taken in 1990 and 1991 scanning the resonance, 400 events were recorded where each has a single deposition of more than 1.5 GeV measured in the polar angular region \costheta(gamma)\ < 0.74 of the electromagnetic calorimeter. It is shown that this number of events can be accounted for by known processes. After subtraction of background events, the invisible width of the Z is determined to be 450 +/- 34(stat.) +/- 34(syst.) MeV. Using Z resonance parameters derived by ALEPH, the corresponding number of light neutrino generations is found to be 2.68 +/- 0.20(stat.) +/- 0.20(syst.).
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520
534
D. BUSKULIC;I. DEBONIS;D. DECAMP;P. GHEZ;C. GOY;J. P. LEES;M. N. MINARD;B. PIETRZYK;F. ARIZTIZABAL;P. COMAS;J. M. CRESPO;M. DELFINO;I. EFTHYMIOPOULOS;E. FERNANDEZ;M. FERNANDEZBOSMAN;V. GAITAN;L. GARRIDO;T. MATTISON;A. PACHECO;C. PADILLA;A. PASCUAL;D. CREANZA;M. DEPALMA;A. FARILLA;G. IASELLI;G. MAGGI;S. NATALI;S. NUZZO;M. QUATTROMINI;A. RANIERI;G. RASO;F. ROMANO;F. RUGGIERI;G. SELVAGGI;L. SILVESTRIS;P. TEMPESTA;G. ZITO;Y. CHAI;H. HU;D. HUANG;X. HUANG;J. LIN;T. WANG;Y. XIE;D. XU;R. XU;J. ZHANG;L. ZHANG;W. ZHAO;E. BLUCHER;G. BONVICINI;J. BOUDREAU;D. CASPER;H. DREVERMANN;R. W. FORTY;G. GANIS;C. GAY;R. HAGELBERG;J. HARVEY;J. HILGART;R. JACOBSEN;B. JOST;J. KNOBLOCH;I. LEHRAUS;T. LOHSE;M. MAGGI;C. MARKOU;M. MARTINEZ;P. MATO;H. MEINHARD;A. MINTEN;A. MIOTTO;R. MIQUEL;H. G. MOSER;P. PALAZZI;J. R. PATER;J. A. PERLAS;J. F. PUSZTASZERI;F. RANJARD;G. REDLINGER;L. ROLANDI;J. ROTHBERG;T. RUAN;M. SAICH;D. SCHLATTER;M. SCHMELLING;F. SEFKOW;W. TEJESSY;I. R. TOMALIN;R. VEENHOF;H. WACHSMUTH;S. WASSERBAECH;W. WIEDENMANN;T. WILDISH;W. WITZELING;J. WOTSCHACK;Z. AJALTOUNI;F. BADAUD;M. BARDADINOTWINOWSKA;R. ELFELLOUS;A. FALVARD;P. GAY;C. GUICHENEY;P. HENRARD;J. JOUSSET;B. MICHEL;J. C. MONTRET;D. PALLIN;P. PERRET;F. PODLYSKI;J. PRORIOL;F. PRULHIERE;F. SAADI;T. FEARNLEY;J. B. HANSEN;J. D. HANSEN;J. R. HANSEN;P. H. HANSEN;R. MOLLERUD;B. S. NILSSON;A. KYRIAKIS;E. SIMOPOULOU;I. SIOTIS;A. VAYAKI;K. ZACHARIADOU;J. BADIER;A. BLONDEL;G. BONNEAUD;J. C. BRIENT;G. FOUQUE;S. ORTEU;A. ROUGE;M. RUMPF;R. TANAKA;M. VERDERI;H. VIDEAU;D. J. CANDLIN;M. I. PARSONS;E. VEITCH;E. FOCARDI;L. MONETA;G. PARRINI;M. CORDEN;C. GEORGIOPOULOS;M. IKEDA;D. LEVINTHAL;A. ANTONELLI;R. BALDINI;G. BENCIVENNI;G. BOLOGNA;F. BOSSI;P. CAMPANA;G. CAPON;F. CERUTTI;V. CHIARELLA;B. DETTORREPIAZZOLI;G. FELICI;P. LAURELLI;G. MANNOCCHI;F. MURTAS;G. P. MURTAS;L. PASSALACQUA;M. PEPEALTARELLI;P. PICCHI;P. COLRAIN;I. TENHAVE;J. G. LYNCH;W. MAITLAND;W. T. MORTON;C. RAINE;P. REEVES;J. M. SCARR;K. SMITH;M. G. SMITH;A. S. THOMPSON;R. M. TURNBULL;B. BRANDL;O. BRAUN;C. GEWENIGER;P. HANKE;V. HEPP;E. E. KLUGE;Y. MAUMARY;A. PUTZER;B. RENSCH;A. STAHL;K. TITTEL;M. WUNSCH;R. BEUSELINCK;D. M. BINNIE;W. CAMERON;M. CATTANEO;D. J. COLLING;P. J. DORNAN;A. M. GREENE;J. F. HASSARD;N. M. LIESKE;A. MOUTOUSSI;J. NASH;S. PATTON;D. G. PAYNE;M. J. PHILLIPS;G. SANMARTIN;J. K. SEDGBEER;A. G. WRIGHT;P. GIRTLER;D. KUHN;G. RUDOLPH;R. VOGL;C. K. BOWDERY;T. J. BRODBECK;A. J. FINCH;F. FOSTER;G. HUGHES;D. JACKSON;N. R. KEEMER;M. NUTTALL;A. PATEL;T. SLOAN;S. W. SNOW;E. P. WHELAN;K. KLEINKNECHT;J. RAAB;B. RENK;H. G. SANDER;H. SCHMIDT;F. STEEG;S. M. WALTHER;R. WANKE;B. WOLF;A. M. BENCHEIKH;C. BENCHOUK;A. BONISSENT;J. CARR;P. COYLE;J. DRINKARD;F. ETIENNE;D. NICOD;S. PAPALEXIOU;P. PAYRE;L. ROOS;D. ROUSSEAU;P. SCHWEMLING;M. TALBY;S. ADLUNG;R. ASSMANN;C. BAUER;W. BLUM;D. BROWN;P. CATTANEO;B. DEHNING;H. DIETL;F. DYDAK;M. FRANK;A. W. HALLEY;K. JAKOBS;J. LAUBER;G. LUTJENS;G. LUTZ;W. MANNER;R. RICHTER;J. SCHRODER;A. S. SCHWARZ;R. SETTLES;H. SEYWERD;U. STIERLIN;U. STIEGLER;R. STDENIS;G. WOLF;R. ALEMANY;J. BOUCROT;O. CALLOT;A. CORDIER;M. DAVIER;L. DUFLOT;J. F. GRIVAZ;P. HEUSSE;D. E. JAFFE;P. JANOT;D. W. KIM;F. LEDIBERDER;J. LEFRANCOIS;A. M. LUTZ;M. H. SCHUNE;J. J. VEILLET;I. VIDEAU;Z. ZHANG;D. ABBANEO;G. BAGLIESI;G. BATIGNANI;U. BOTTIGLI;C. BOZZI;G. CALDERINI;M. CARPINELLI;M. A. CIOCCI;V. CIULLI;R. DELLORSO;I. FERRANTE;F. FIDECARO;L. FOA;F. FORTI;A. GIASSI;M. A. GIORGI;A. GREGORIO;F. LIGABUE;A. LUSIANI;E. B. MANNELLI;P. S. MARROCCHESI;A. MESSINEO;F. PALLA;G. RIZZO;G. SANGUINETTI;P. SPAGNOLO;J. STEINBERGER;R. TENCHINI;G. TONELLI;G. TRIGGIANI;A. VALASSI;C. VANNINI;A. VENTURI;P. G. VERDINI;J. WALSH;A. P. BETTERIDGE;Y. GAO;M. G. GREEN;P. V. MARCH;L. M. MIR;T. MEDCALF;I. S. QUAZI;J. A. STRONG;L. R. WEST;D. R. BOTTERILL;R. W. CLIFFT;T. R. EDGECOCK;S. HAYWOOD;P. R. NORTON;J. C. THOMPSON;B. BLOCHDEVAUX;P. COLAS;H. DUARTE;S. EMERY;W. KOZANECKI;E. LANCON;M. C. LEMAIRE;E. LOCCI;B. MARX;P. PEREZ;J. RANDER;J. F. RENARDY;A. ROSOWSKY;A. ROUSSARIE;J. P. SCHULLER;J. SCHWINDLING;D. S. MOHAND;B. VALLAGE;R. P. JOHNSON;A. M. LITKE;G. TAYLOR;J. WEAR;J. G. ASHMAN;W. BABBAGE;C. N. BOOTH;C. BUTTAR;S. CARTWRIGHT;F. COMBLEY;I. DAWSON;L. F. THOMPSON;E. BARBERIO;A. BOHRER;S. BRANDT;G. COWAN;C. GRUPEN;G. LUTTERS;F. RIVERA;U. SCHAFER;L. SMOLIK;L. BOSISIO;R. DELLAMARINA;G. GIANNINI;B. GOBBO;F. RAGUSA;L. BELLANTONI;W. CHEN;J. S. CONWAY;Z. FENG;D. P. S.;Y. S. GAO;J. GRAHL;J. L. HARTON;O. J. HAYES;J. M. NACHTMAN;Y. B. PAN;Y. SAADI;M. SCHMITT;I. SCOTT;V. SHARMA;Z. H. SHI;J. D. TURK;A. M. WALSH;F. V. WEBER;S. L. WU;X. WU;M. ZHENG;G. ZOBERNIG
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