Measurement of Charged-Particle Multiplicities in Gluon and Quark Jets inpp¯Collisions ats=1.8 TeV

Measurement of Charged-Particle Multiplicities in Gluon and Quark Jets inpp¯Collisions ats=1.8 TeV

D. Acosta,T. Affolder,M. G. Albrow,D. Ambrose,D. Amidei,K. Anikeev,J. Antos,G. Apollinari,T. Arisawa,A. Artikov,W. Ashmanskas,F. Azfar,Patrizia Azzi,N. Bacchetta,H. Bachacou,W. Badgett,A. Barbaro-Galtieri,V. E. Barnes,B. A. Barnett,S. Baroiant,M. Barone,G. Bauer,F. Bedeschi,S. Behari,S. Belforte,William Bell,G. Bellettini,J. Bellinger,D. Benjamin,A. Beretvas,A. Bhatti,M. Binkley,D. Bisello,M. Bishai,R. E. Blair,C. Blocker,Kenneth Bloom,B. Blumenfeld,A. Bocci,A. Bodek,G. Bolla,A. Bolshov,D. Bortoletto,J. Boudreau,C. Bromberg,E. Brubaker,J. Budagov,H. S. Budd,K. Burkett,G. Busetto,K. L. Byrum,S. Cabrera,M. Campbell,W. Carithers,D. Carlsmith,A. Castro,D. Cauz,A. Cerri,L. Cerrito,J. Chapman,C. Chen,Y. C. Chen,M. Chertok,Giorgio Chiarelli,G. Chlachidze,F. Chlebana,M. L. Chu,J. Y. Chung,W.-H. Chung,Y. S. Chung,C. I. Ciobanu,A. G. Clark,M. Coca,A. Connolly,M. Convery,J. Conway,M. Cordelli,J. Cranshaw,R. Culbertson,D. Dagenhart,S. D’Auria,P. De Barbaro,Sandro De Cecco,S. Dell’Agnello,M. Dell’Orso,S. Demers,L. Demortier,M. Deninno,D. De Pedis,P. F. Derwent,C. Dionisi,J. R. Dittmann,A. Dominguez,S. Donati,M. D’Onofrio,T. Dorigo,N. Eddy,R. Erbacher,D. Errede,S. Errede,R. Eusebi,Sinead Farrington,R. G. Feild,J. P. Fernandez,C. Ferretti,R. D. Field,I. Fiori,B. Flaugher,L. R. Flores-Castillo,G. W. Foster,M. Franklin,J. Friedman,I. Furic,M. Gallinaro,M. Garcia-Sciveres,A. F. Garfinkel,C. Gay,D. W. Gerdes,E. Gerstein,S. Giagu,Paola Giannetti,K. Giolo,Mario Giordani,P. Giromini,V. Glagolev,D. Glenzinski,M. Gold,N. Goldschmidt,J. Goldstein,G. Gomez,M. Goncharov,I. Gorelov,A. T. Goshaw,Y. Gotra,K. Goulianos,A. Gresele,C. Grosso-Pilcher,M. Guenther,J. Guimaraes Da Costa,C. Haber,S. R. Hahn,E. Halkiadakis,R. Handler,F. Happacher,K. Hara,R. M. Harris,F. Hartmann,K. Hatakeyama,J. Hauser,J. Heinrich,M. Hennecke,M. Herndon,C. Hill,A. Hocker,K. D. Hoffman,S. Hou,B. T. Huffman,R. Hughes,J. Huston,C. Issever,J. Incandela,Gianluca Introzzi,M. Iori,Andrew Ivanov,Y. Iwata,B. Iyutin,E. James,M. Jones,T. Kamon,J. Kang,M. Karagoz Unel,S. Kartal,H. Kasha,Y. Kato,R. D. Kennedy,R. Kephart,Benjamin Kilminster,D. H. Kim,H. S. Kim,M. J. Kim,S. B. Kim,T. H. Kim,Y. K. Kim,M. Kirby,L. Kirsch,S. Klimenko,P. Koehn,K. Kondo,J. Konigsberg,A. Korn,A. Korytov,J. Kroll,M. Kruse,V. Krutelyov,S. E. Kuhlmann,N. Kuznetsova,A. T. Laasanen,Stefano Lami,S. Lammel,J. Lancaster,K. Lannon,R. Lander,A. Lath,G. Latino,T. LeCompte,Y. Le,J. Lee,S. W. Lee,Nuno Leonardo,S. Leone,J. D. Lewis,K. Li,C. S. Lin,M. Lindgren,T. M. Liss,T. Liu,D. O. Litvintsev,N. S. Lockyer,A. Loginov,M. Loreti,D. Lucchesi,Patrick Lukens,L. Lyons,J. Lys,R. Madrak,K. Maeshima,P. Maksimovic,L. Malferrari,M. Mangano,G. Manca,M. Mariotti,M. Martin,A. Martin,V. Martin,P. Mazzanti,K. S. McFarland,P. McIntyre,M. Menguzzato,A. Menzione,P. Merkel,C. Mesropian,A. Meyer,T. Miao,R. Miller,J. S. Miller,S. Miscetti,G. Mitselmakher,N. Moggi,R. Moore,T. Moulik,M. Mulhearn,A. Mukherjee,T. Muller,A. Munar,P. Murat,J. Nachtman,S. Nahn,I. Nakano,R. Napora,F. Niell,C. Nelson,T. Nelson,C. Neu,M. S. Neubauer,C. Newman-Holmes,T. Nigmanov,L. Nodulman,S. H. Oh,Y. D. Oh,T. Ohsugi,T. Okusawa,W. Orejudos,C. Pagliarone,F. Palmonari,Riccardo Paoletti,V. Papadimitriou,J. Patrick,G. Pauletta,Manfred Paulini,T. Pauly,C. Paus,D. Pellett,A. Penzo,T. J. Phillips,G. Piacentino,J. Piedra,K. T. Pitts,Robert Plunkett,A. Pompo,L. Pondrom,G. Pope,T. Pratt,F. Prokoshin,A. Pronko,J. Proudfoot,F. Ptohos,O. Poukhov,G. Punzi,J. Rademacker,A. Rakitine,F. Ratnikov,H. Ray,A. Reichold,P. Renton,M. Rescigno,F. Rimondi,L. Ristori,W. J. Robertson,T. Rodrigo,S. Rolli,L. Rosenson,R. Roser,R. Rossin,Carsten Rott,A. Roy,A. Ruiz,D. Ryan,A. Safonov,R. St. Denis,W. K. Sakumoto,D. Saltzberg,C. Sanchez,A. Sansoni,L. Santi,S. Sarkar,P. Savard,A. Savoy-Navarro,P. Schlabach,E. E. Schmidt,M. P. Schmidt,M. Schmitt,L. Scodellaro,A. Scribano,A. Sedov,S. Seidel,Y. Seiya,A. Semenov,F. Semeria,Marjorie Shapiro,P. F. Shepard,T. Shibayama,Makoto Shimojima,M. Shochet,A. Sidoti,Alan Sill,P. Sinervo,A. J. Slaughter,Krzysztof Sliwa,F. D. Snider,R. Snihur,M. Spezziga,F. Spinella,M. Spiropulu,L. Spiegel,A. Stefanini,J. Strologas,D. Stuart,A. Sukhanov,K. Sumorok,T. Suzuki,R. Takashima,K. Takikawa,M. Tanaka,M. Tecchio,R. J. Tesarek,P. K. Teng,Koji Terashi,S. Tether,J. Thom,A. S. Thompson,Evelyn Thomson,P. Tipton,S. Tkaczyk,David Toback,K. Tollefson,Diego Tonelli,M. Tönnesmann,H. Toyoda,W. Trischuk,J. Tseng,D. Tsybychev,N. Turini,F. Ukegawa,T. Unverhau,T. Vaiciulis,A. Varganov,E. Vataga,S. Vejcik,G. Velev,G. Veramendi,R. Vidal,I. Vila,R. Vilar,I. Volobouev,M. Von Der Mey,R. G. Wagner,W. Wagner,Z. Wan,C. Wang,M. J. Wang,S. M. Wang,B. Ward,S. Waschke,D. Waters,T. Watts,M. Weber,W. C. Wester,B. Whitehouse,A. B. Wicklund,E. Wicklund,H. H. Williams,P. Wilson,B. L. Winer,S. Wolbers,Marcin Wolter,S. Worm,X. Wu,F. Würthwein,U. K. Yang,W. Yao,G. P. Yeh,K. Yi,J. Yoh,T. Yoshida,I. Yu,S. Yu,J. C. Yun,L. Zanello,A. Zanetti,F. Zetti,S. Zucchelli;D. Acosta;T. Affolder;M. G. Albrow;D. Ambrose;D. Amidei;K. Anikeev;J. Antos;G. Apollinari;T. Arisawa;A. Artikov;W. Ashmanskas;F. Azfar;Patrizia Azzi;N. Bacchetta;H. Bachacou;W. Badgett;A. Barbaro-Galtieri;V. E. Barnes;B. A. Barnett;S. Baroiant;M. Barone;G. Bauer;F. Bedeschi;S. Behari;S. Belforte;William Bell;G. Bellettini;J. Bellinger;D. Benjamin;A. Beretvas;A. Bhatti;M. Binkley;D. Bisello;M. Bishai;R. E. Blair;C. Blocker;Kenneth Bloom;B. Blumenfeld;A. Bocci;A. Bodek;G. Bolla;A. Bolshov;D. Bortoletto;J. Boudreau;C. Bromberg;E. Brubaker;J. Budagov;H. S. Budd;K. Burkett;G. Busetto;K. L. Byrum;S. Cabrera;M. Campbell;W. Carithers;D. Carlsmith;A. Castro;D. Cauz;A. Cerri;L. Cerrito;J. Chapman;C. Chen;Y. C. Chen;M. Chertok;Giorgio Chiarelli;G. Chlachidze;F. Chlebana;M. L. Chu;J. Y. Chung;W.-H. Chung;Y. S. Chung;C. I. Ciobanu;A. G. Clark;M. Coca;A. Connolly;M. Convery;J. Conway;M. Cordelli;J. Cranshaw;R. Culbertson;D. Dagenhart;S. D’Auria;P. De Barbaro;Sandro De Cecco;S. Dell’Agnello;M. Dell’Orso;S. Demers;L. Demortier;M. Deninno;D. De Pedis;P. F. Derwent;C. Dionisi;J. R. Dittmann;A. Dominguez;S. Donati;M. D’Onofrio;T. Dorigo;N. Eddy;R. Erbacher;D. Errede;S. Errede;R. Eusebi;Sinead Farrington;R. G. Feild;J. P. Fernandez;C. Ferretti;R. D. Field;I. Fiori;B. Flaugher;L. R. Flores-Castillo;G. W. Foster;M. Franklin;J. Friedman;I. Furic;M. Gallinaro;M. Garcia-Sciveres;A. F. Garfinkel;C. Gay;D. W. Gerdes;E. Gerstein;S. Giagu;Paola Giannetti;K. Giolo;Mario Giordani;P. Giromini;V. Glagolev;D. Glenzinski;M. Gold;N. Goldschmidt;J. Goldstein;G. Gomez;M. Goncharov;I. Gorelov;A. T. Goshaw;Y. Gotra;K. Goulianos;A. Gresele;C. Grosso-Pilcher;M. Guenther;J. Guimaraes Da Costa;C. Haber;S. R. Hahn;E. Halkiadakis;R. Handler;F. Happacher;K. Hara;R. M. Harris;F. Hartmann;K. Hatakeyama;J. Hauser;J. Heinrich;M. Hennecke;M. Herndon;C. Hill;A. Hocker;K. D. Hoffman;S. Hou;B. T. Huffman;R. Hughes;J. Huston;C. Issever;J. Incandela;Gianluca Introzzi;M. Iori;Andrew Ivanov;Y. Iwata;B. Iyutin;E. James;M. Jones;T. Kamon;J. Kang;M. Karagoz Unel;S. Kartal;H. Kasha;Y. Kato;R. D. Kennedy;R. Kephart;Benjamin Kilminster;D. H. Kim;H. S. Kim;M. J. Kim;S. B. Kim;T. H. Kim;Y. K. Kim;M. Kirby;L. Kirsch;S. Klimenko;P. Koehn;K. Kondo;J. Konigsberg;A. Korn;A. Korytov;J. Kroll;M. Kruse;V. Krutelyov;S. E. Kuhlmann;N. Kuznetsova;A. T. Laasanen;Stefano Lami;S. Lammel;J. Lancaster;K. Lannon;R. Lander;A. Lath;G. Latino;T. LeCompte;Y. Le;J. Lee;S. W. Lee;Nuno Leonardo;S. Leone;J. D. Lewis;K. Li;C. S. Lin;M. Lindgren;T. M. Liss;T. Liu;D. O. Litvintsev;N. S. Lockyer;A. Loginov;M. Loreti;D. Lucchesi;Patrick Lukens;L. Lyons;J. Lys;R. Madrak;K. Maeshima;P. Maksimovic;L. Malferrari;M. Mangano;G. Manca;M. Mariotti;M. Martin;A. Martin;V. Martin;P. Mazzanti;K. S. McFarland;P. McIntyre;M. Menguzzato;A. Menzione;P. Merkel;C. Mesropian;A. Meyer;T. Miao;R. Miller;J. S. Miller;S. Miscetti;G. Mitselmakher;N. Moggi;R. Moore;T. Moulik;M. Mulhearn;A. Mukherjee;T. Muller;A. Munar;P. Murat;J. Nachtman;S. Nahn;I. Nakano;R. Napora;F. Niell;C. Nelson;T. Nelson;C. Neu;M. S. Neubauer;C. Newman-Holmes;T. Nigmanov;L. Nodulman;S. H. Oh;Y. D. Oh;T. Ohsugi;T. Okusawa;W. Orejudos;C. Pagliarone;F. Palmonari;Riccardo Paoletti;V. Papadimitriou;J. Patrick;G. Pauletta;Manfred Paulini;T. Pauly;C. Paus;D. Pellett;A. Penzo;T. J. Phillips;G. Piacentino;J. Piedra;K. T. Pitts;Robert Plunkett;A. Pompo;L. Pondrom;G. Pope;T. Pratt;F. Prokoshin;A. Pronko;J. Proudfoot;F. Ptohos;O. Poukhov;G. Punzi;J. Rademacker;A. Rakitine;F. Ratnikov;H. Ray;A. Reichold;P. Renton;M. Rescigno;F. Rimondi;L. Ristori;W. J. Robertson;T. Rodrigo;S. Rolli;L. Rosenson;R. Roser;R. Rossin;Carsten Rott;A. Roy;A. Ruiz;D. Ryan;A. Safonov;R. St. Denis;W. K. Sakumoto;D. Saltzberg;C. Sanchez;A. Sansoni;L. Santi;S. Sarkar;P. Savard;A. Savoy-Navarro;P. Schlabach;E. E. Schmidt;M. P. Schmidt;M. Schmitt;L. Scodellaro;A. Scribano;A. Sedov;S. Seidel;Y. Seiya;A. Semenov;F. Semeria;Marjorie Shapiro;P. F. Shepard;T. Shibayama;Makoto Shimojima;M. Shochet;A. Sidoti;Alan Sill;P. Sinervo;A. J. Slaughter;Krzysztof Sliwa;F. D. Snider;R. Snihur;M. Spezziga;F. Spinella;M. Spiropulu;L. Spiegel;A. Stefanini;J. Strologas;D. Stuart;A. Sukhanov;K. Sumorok;T. Suzuki;R. Takashima;K. Takikawa;M. Tanaka;M. Tecchio;R. J. Tesarek;P. K. Teng;Koji Terashi;S. Tether;J. Thom;A. S. Thompson;Evelyn Thomson;P. Tipton;S. Tkaczyk;David Toback;K. Tollefson;Diego Tonelli;M. Tönnesmann;H. Toyoda;W. Trischuk;J. Tseng;D. Tsybychev;N. Turini;F. Ukegawa;T. Unverhau;T. Vaiciulis;A. Varganov;E. Vataga;S. Vejcik;G. Velev;G. Veramendi;R. Vidal;I. Vila;R. Vilar;I. Volobouev;M. Von Der Mey;R. G. Wagner;W. Wagner;Z. Wan;C. Wang;M. J. Wang;S. M. Wang;B. Ward;S. Waschke;D. Waters;T. Watts;M. Weber;W. C. Wester;B. Whitehouse;A. B. Wicklund;E. Wicklund;H. H. Williams;P. Wilson;B. L. Winer;S. Wolbers;Marcin Wolter;S. Worm;X. Wu;F. Würthwein;U. K. Yang;W. Yao;G. P. Yeh;K. Yi;J. Yoh;T. Yoshida;I. Yu;S. Yu;J. C. Yun;L. Zanello;A. Zanetti;F. Zetti;S. Zucchelli;
physical review letters 2005 Vol. 94 pp. 171802-
158
zucchelli2005physicalmeasurement

Abstract

We report the first largely model independent measurement of charged particle multiplicities in quark and gluon jets, Nq and Ng, produced at the Fermilab Tevatron in pp¯ collisions with a center-of-mass energy of 1.8 TeV and recorded by the Collider Detector at Fermilab. The measurements are made for jets with average energies of 41 and 53 GeV by counting charged particle tracks in cones with opening angles of θc=0.28, 0.36, and 0.47 rad around the jet axis. The corresponding jet hardness Q=Ejetθc varies in the range from 12 to 25 GeV. At Q=19.2 GeV, the ratio of multiplicities r=Ng/Nq is found to be 1.64±0.17, where statistical and systematic uncertainties are added in quadrature. The results are in agreement with resummed perturbative QCD calculations.

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