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Subjet multiplicity of gluon and quark jets reconstructed with the K$_{\perp}$ algorithm in $p\bar p$ collisions

V.M. Abazov B. Abbott Abdelmalek Abdesselam 1 M. Abolins V. Abramov B.S. Acharya D.L. Adams M. Adams S.N. Ahmed G.D. Alexeev A. Alton G.A. Alves N. Amos E.W. Anderson Y. Arnoud 2 C. Avila M.M. Baarmand V.V. Babintsev L. Babukhadia T.C. Bacon A. Baden B. Baldin P.W. Balm S. Banerjee E. Barberis P. Baringer J. Barreto J.F. Bartlett U. Bassler 3 D. Bauer A. Bean F. Beaudette M. Begel A. Belyaev S.B. Beri G. Bernardi 3 I. Bertram A. Besson 2 R. Beuselinck V.A. Bezzubov P.C. Bhat V. Bhatnagar 1 M. Bhattacharjee G. Blazey F. Blekman S. Blessing A. Boehnlein N.I. Bojko F. Borcherding K. Bos T. Bose A. Brandt R. Breedon G. Briskin R. Brock G. Brooijmans A. Bross D. Buchholz M. Buehler V. Buescher V.S. Burtovoi J.M. Butler F. Canelli W. Carvalho D. Casey Z. Casilum H. Castilla-Valdez D. Chakraborty K.M. Chan S.V. Chekulaev D.K. Cho S. Choi S. Chopra J.H. Christenson M. Chung D. Claes A.R. Clark J. Cochran L. Coney B. Connolly W.E. Cooper D. Coppage S. Crepe-Renaudin 2 M.A.C. Cummings D. Cutts G.A. Davis K. Davis K. De S.J. de Jong K. del Signore M. Demarteau R. Demina P. Demine 2 D. Denisov S.P. Denisov S. Desai H.T. Diehl M. Diesburg S. Doulas Y. Ducros L.V. Dudko S. Duensing L. Duflot 1 S.R. Dugad A. Duperrin 4 A. Dyshkant D. Edmunds J. Ellison V.D. Elvira R. Engelmann S. Eno G. Eppley P. Ermolov O.V. Eroshin J. Estrada H. Evans V.N. Evdokimov T. Fahland S. Feher D. Fein T. Ferbel F. Filthaut H.E. Fisk Y. Fisyak E. Flattum F. Fleuret M. Fortner H. Fox K.C. Frame S. Fu S. Fuess E. Gallas A.N. Galyaev M. Gao V. Gavrilov R.J. Genik Ii K. Genser C.E. Gerber Y. Gershtein R. Gilmartin G. Ginther B. Gomez G. Gomez P.I. Goncharov J.L. Gonzalez Solis H. Gordon L.T. Goss K. Gounder A. Goussiou N. Graf G. Graham P.D. Grannis J.A. Green H. Greenlee Z.D. Greenwood S. Grinstein L. Groer S. Grunendahl Anupam Gupta S.N. Gurzhev G. Gutierrez P. Gutierrez N.J. Hadley H. Haggerty S. Hagopian V. Hagopian R.E. Hall P. Hanlet Scott Hansen J.M. Hauptman C. Hays Christian Hebert D. Hedin J.M. Heinmiller A.P. Heinson U. Heintz T. Heuring M.D. Hildreth R. Hirosky J.D. Hobbs B. Hoeneisen Yue Huang R. Illingworth A.S. Ito M. Jaffre S. Jain R. Jesik K. Johns M. Johnson A. Jonckheere H. Jostlein A. Juste W. Kahl S. Kahn E. Kajfasz 4 A.M. Kalinin D. Karmanov D. Karmgard R. Kehoe A. Khanov A. Kharchilava S.K. Kim B. Klima B. Knuteson W. Ko J.M. Kohli A.V. Kostritskiy J. Kotcher B. Kothari A.V. Kotwal A.V. Kozelov E.A. Kozlovsky J. Krane M.R. Krishnaswamy P. Krivkova S. Krzywdzinski M. Kubantsev S. Kuleshov Y. Kulik S. Kunori A. Kupco V.E. Kuznetsov G. Landsberg W.M. Lee A. Leflat C. Leggett F. Lehner J. Li Q.Z. Li Xiaojian Li J.G.R. Lima D. Lincoln S.L. Linn J. Linnemann R. Lipton A. Lucotte 2 L. Lueking C. Lundstedt C. Luo A.K.A. Maciel R.J. Madaras V.L. Malyshev V. Manankov H.S. Mao T. Marshall M.I. Martin K.M. Mauritz B. May A.A. Mayorov R. Mccarthy T. Mcmahon H.L. Melanson M. Merkin K.W. Merritt C. Miao H. Miettinen D. Mihalcea C.S. Mishra N. Mokhov N.K. Mondal H.E. Montgomery R.W. Moore M. Mostafa H. da Motta E. Nagy 4 F. Nang M. Narain V.S. Narasimham N.A. Naumann H.A. Neal J.P. Negret S. Negroni 4 T. Nunnemann D. O'Neil V. Oguri B. Olivier 3 N. Oshima P. Padley L.J. Pan K. Papageorgiou A. Para N. Parashar R. Partridge N. Parua M. Paterno A. Patwa B. Pawlik J. Perkins O. Peters P. Petroff R. Piegaia B.G. Pope E. Popkov H.B. Prosper S. Protopopescu M.B. Przybycien J. Qian R. Raja S. Rajagopalan E. Ramberg P.A. Rapidis N.W. Reay S. Reucroft M. Ridel 1 M. Rijssenbeek T. Rockwell M. Roco C. Royon P. Rubinov R. Ruchti J. Rutherfoord B.M. Sabirov G. Sajot 2 A. Santoro L. Sawyer R.D. Schamberger H. Schellman A. Schwartzman N. Sen E. Shabalina R.K. Shivpuri D. Shpakov M. Shupe R.A. Sidwell V. Simak H. Singh J.B. Singh V. Sirotenko P. Slattery E. Smith R.P. Smith R. Snihur G.R. Snow J. Snow S. Snyder J. Solomon Y. Song V. Sorin M. Sosebee N. Sotnikova K. Soustruznik M. Souza N.R. Stanton G. Steinbruck R.W. Stephens F. Stichelbaut D. Stoker V. Stolin A. Stone D.A. Stoyanova M.A. Strang M. Strauss M. Strovink L. Stutte A. Sznajder M. Talby 4 W. Taylor S. Tentindo-Repond S.M. Tripathi T.G. Trippe A.S. Turcot P.M. Tuts V. Vanev R. van Kooten N. Varelas L.S. Vertogradov F. Villeneuve-Seguier 4 A.A. Volkov A.P. Vorobev H.D. Wahl H. Wang Z.M. Wang J. Warchol G. Watts M. Wayne H. Weerts A. White J.T. White D. Whiteson J.A. Wightman D.A. Wijngaarden S. Willis S.J. Wimpenny J. Womersley D.R. Wood Q. Xu R. Yamada P. Yamin T. Yasuda Y.A. Yatsunenko K. Yip S. Youssef J. Yu Z. Yu M. Zanabria X. Zhang H. Zheng B. Zhou Z. Zhou M. Zielinski D. Zieminska A. Zieminski V. Zutshi E.G. Zverev F. A. Zylberstejn
Abstract : The D0 Collaboration has studied for the first time the properties of hadron-collider jets reconstructed with a successive-combination algorithm based on relative transverse momenta ($k_{\perp}$) of energy clusters. Using the standard value D = 1.0 of the jet-separation parameter in the $k_{\perp}$ algorithm, we find that the $p_T$ of such jets is higher than the $E_T$ of matched jets reconstructed with cones of radius R = 0.7, by about 5 (8) GeV at $p_T \approx 90$ (240) GeV. To examine internal jet structure, the $k_{\perp}$ algorithm is applied within D = 0.5 jets to resolve any subjets. The multiplicity of subjets in jet samples at $\sqrt{s} = 1800$ GeV and 630 GeV is extracted separately for gluons ($M_g$) and quarks ($M_q$), and the ratio of average subjet multiplicities in gluon and quark jets is measured as $(M_{g} - 1) / (M_{q} - 1) = 1.84 \pm 0.15 (stat.) \pm ^{0.22}_{0.18} (sys.)$. This ratio is in agreement with the expectations from the HERWIG Monte Carlo event generator and a resummation calculation, and with observations in $e^+e^-$ annihilations, and is close to the naive prediction for the ratio of color charges of $C_A/C_F = 9/4 = 2.25$.
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V.M. Abazov, B. Abbott, Abdelmalek Abdesselam, M. Abolins, V. Abramov, et al.. Subjet multiplicity of gluon and quark jets reconstructed with the K$_{\perp}$ algorithm in $p\bar p$ collisions. Physical Review D, American Physical Society, 2002, 65, 052008-(20 p.). ⟨in2p3-00011205⟩

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