Particle multiplicity of unbiased gluon jets from e+e− three-jet events | Zendy

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Particle multiplicity of unbiased gluon jets from e+e− three-jet events

Author(s) -

G. Abbiendi,

C. Ainsley,

P.F. Åkesson,

G. Alexander,

J. Allison,

G. Anagnostou,

K. J. Anderson,

S. Arcelli,

S. Asai,

D. Axen,

G. Azuelos,

I. Bailey,

E. L. Barberio,

R. J. Barlow,

R. J. Batley,

P. Bechtle,

T. Behnke,

K. W. Bell,

P. J. Bell,

G. Bella,

A. Bellerive,

G. Benelli,

S. Bethke,

O. Biebel,

I.J. Bloodworth,

O. Boeriu,

P. Bock,

J. Böhme,

D. Bonacorsi,

M. Boutemeur,

S. Braibant,

L. Brigliadori,

R. M. Brown,

H. Burckhart,

J. Cammin,

S. Campana,

R.K. Carnegie,

B. Caron,

A. A. Carter,

J. R. Carter,

C. Y. Chang,

D. G. Charlton,

P. E. L. Clarke,

E. Clay,

I. Cohen,

J. Couchman,

A. Csilling,

M. Cuffiani,

S. Dado,

G. M. Dallavalle,

S. Dallison,

A. De Roeck,

E. A. De Wolf,

P. Dervan,

K. Desch,

B. Dienes,

M. Donkers,

J. Dubbert,

E. Duchovni,

G. Duckeck,

I. P. Duerdoth,

E. Etzion,

F. Fabbri,

L. Feld,

P. Ferrari,

F. Fiedler,

I. Fleck,

M. Ford,

A. Frey,

A. Fürtjes,

D. I. Futyan,

P. Gag,

J. W. Gary,

G. Gaycken,

Ch. Geich-Gimbel,

P. Giacomelli,

M. Giunta,

Joel O. Goldberg,

K. Graham,

E. Gross,

J. Grunhaus,

M. Gruwé,

P. O. Günther,

A. Gupta,

C. Hajdu,

M. Hamann,

Gail Hanson,

K. Harder,

A. Harel,

M. Harin-Dirac,

M. Hauschild,

J. Hauschildt,

C. M. Hawkes,

R. Hawkings,

R.J. Hemingway,

C. Hensel,

G. Herten,

R. D. Heuer,

J. C. Hill,

K. D. Hoffman,

R. J. Homer,

D. Horváth,

K. R. Hossain,

Robert Howard,

P. Hüntemeyer,

P. Igo-Kemenes,

K. Ishii,

A. Jawahery,

H. Jeremie,

C. R. Jones,

P. Jovanovic,

T. R. Junk,

N. Kanaya,

J. Kanzaki,

G. Karapetian,

D. Karlen,

V. Kartvelishvili,

K. Kawagoe,

T. Kawamoto,

R. Keeler,

R. G. Kellogg,

B. W. Kennedy,

DH Kim,

K. Klein,

A. Klier,

S. Kluth,

T. Kobayashi,

M. Kobel,

T. P. Kokott,

Sachio Komamiya,

R. Kowalewski,

T. Krämer,

T. Kress,

J. von Krogh,

D. Krop,

T. Kuhl,

M. Kupper,

P. Kyberd,

G. Lafferty,

H. Landsman,

D. Lanske,

I. Lawson,

J. G. Layter,

A. Leins,

D. Lellouch,

J. Letts,

L. Levinson,

J. Lillich,

C. Littlewood,

S. L. Lloyd,

F. K. Loebinger,

J. G. Lu,

J. Ludwig,

A. Macchiolo,

A. Macpherson,

W. Mader,

S. Marcellini,

T.E. Marchant,

A. J. Martin,

J. P. Martin,

G. Martı́nez,

G. Masetti,

T. Mashimo,

P. Mättig,

W. J. McDonald,

J. A. McKenna,

T. McMahon,

R. A. McPherson,

F. Meijers,

P. Mendez-Lorenzo,

W. Menges,

F. S. Merritt,

H. Mes,

A. Michelini,

S. Mihara,

G. Mikenberg,

D. J. Miller,

S. Moed,

W. Mohr,

T. Mori,

A. Mutter,

K. Nagai,

I. Nakamura,

H. A. Neal,

R. Nisius,

S. W. O'Neale,

A. Oh,

A. Okpara,

M. J. Oreglia,

S. Orito,

C. Pahl,

G. Pásżtor,

J. R. Pater,

G. N. Patrick,

J. E. Pilcher,

J. Pinfold,

D. E. Plane,

B. Poli,

J. Polok,

O. Pooth,

A. Quadt,

K. Rabbertz,

C. Rembser,

P. Renkel,

H. Rick,

N. Rodning,

J. M. Roney,

S. Rosati,

K. Roscoe,

Y. Rozen,

K. Runge,

D. R. Rust,

K. Sachs,

T. Saeki,

O. Sahr,

E. K.G. Sarkisyan,

A. D. Schaile,

O. Schaile,

P. Scharff-Hansen,

M. Schröder,

M. Schumacher,

C. Schwick,

W. G. Scott,

R. Seuster,

T. Shears,

B. C. Shen,

C. H. Shepherd-Themistocleous,

M. Shapiro,

A. Skuja,

A. M. Smith,

G. A. Snow,

R. Sobie,

S. SöldnerRembold,

S. Spagnolo,

F. Spanò,

M. Sproston,

A. Stahl,

K. Stephens,

D. Strom,

R. Strühmer,

L. Stumpf,

B. Surrow,

S. Tarem,

M. Tasevsky,

RJ Taylor,

R. J. Teuscher,

J. H. Thomas,

M. Thomson,

E. Torrence,

D. Toya,

T. Trefzger,

A. Tricoli,

I. M. Trigger,

Zoltán László Trócsányi,

E. Tsur,

M. F. Watson,

I. Ueda,

B. Ujvári,

B. Vachon,

C. F. Vollmer,

P. Vannerem,

M. Verzocchi,

H. Voss,

J. H. Vossebeld,

D. Waller,

C. P. Ward,

D. R. Ward,

P. M. Watkins,

A. T. Watson,

N. K. Watson,

P. S. Wells,

T. Wengler,

N. Wermes,

D. Wetterling,

G. Wilson,

T. R. Wyatt,

S. Yamashita,

V. Zacek,

D. Zer-Zion

Publication year - 2002

Publication title -

the european physical journal c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.938

H-Index - 198

eISSN - 1434-6052

pISSN - 1434-6044

DOI - 10.1007/s100520200926

Subject(s) - physics , multiplicity (mathematics) , particle physics , gluon , hadron , jet (fluid) , quark , energy (signal processing) , quark–gluon plasma , geometry , thermodynamics , quantum mechanics , mathematics

The charged particle multiplicities of two- and three-jet events from thereaction e+e- -> Z0 -> hadrons are measured for Z0 decays to light quark (uds)flavors. Using recent theoretical expressions to account for biases from eventselection, results corresponding to unbiased gluon jets are extracted over arange of jet energies from about 11 to 30 GeV. We find consistency betweenthese results and direct measurements of unbiased gluon jet multiplicity fromupsilon and Z0 decays. The unbiased gluon jet data including the directmeasurements are compared to corresponding results for quark jets. We performfits based on analytic expressions for particle multiplicity in jets todetermine the ratio r = Ng/Nq of multiplicities between gluon and quark jets asa function of energy. We also determine the ratio of slopes, r(1) =(dNg/dy)/(dNq/dy), and of curvatures, r(2) = (d2Ng/dy2)/(d2Nq/dy2), where yspecifies the energy scale. At 30 GeV, we find r = 1.422 +/- 0.051, r(1) =1.761 +/- 0.071 and r(2) = 1.98 +/- 0.13, where the uncertainties are thestatistical and systematic terms added in quadrature. These results are ingeneral agreement with theoretical predictions. In addition, we use themeasurements of the energy dependence of Ng and Nq to determine an effectivevalue of the ratio of QCD color factors, CA/CF. Our result, CA/CF = 2.23 +/-0.14 (total), is consistent with the QCD value of 2.25.

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