Phys. Rev. D
44,
601–616
(1991)
Measurement of QCD jet broadening in pp̅ collisions at √s=1.8 TeV
F. Abe et al. (CDF Collaboration)
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F. Abe, D. Amidei, G. Apollinari, G. Ascoli, M. Atac, P. Auchincloss, A. R. Baden, A. Barbaro-Galtieri, V. E. Barnes, F. Bedeschi, S. Behrends, S. Belforte, G. Bellettini, J. Bellinger, J. Bensinger, A. Beretvas, P. Berge, S. Bertolucci, S. Bhadra, M. Binkley, R. Blair, C. Blocker, J. Bofill, V. Bolognesi, A. W. Booth, G. Brandenburg, D. Brown, A. Byon, K. L. Byrum, M. Campbell, R. Carey, W. Carithers, D. Carlsmith, J. T. Carroll, R. Cashmore, F. Cervelli, K. Chadwick,, T. Chapin, G. Chiarelli, W. Chinowsky, S. Cihangir, D. Cline, D. Connor, M. Contreras, J. Cooper, M. Cordelli, M. Curatolo, C. Day, R. DelFabbro, M. Dell'Orso, L. DeMortier, T. Devlin, D. DiBitonto, R. Diebold, F. Dittus, A. DiVirgilio, J. E. Elias, R. Ely, S. Errede, B. Esposito, A. Feldman, B. Flaugher, E. Focardi, G. W. Foster, M. Franklin,, J. Freeman, H. Frisch, Y. Fukui, A. F. Garfinkel, P. Giannetti, N. Giokaris, P. Giromini, L. Gladney, M. Gold, K. Goulianos, C. Grosso-Pilcher, C. Haber, S. R. Hahn, R. Handler, R. M. Harris, J. Hauser, T. Hessing, R. Hollebeek, P. Hu, B. Hubbard, P. Hurst, J. Huth, H. Jensen, R. P. Johnson, U. Joshi, R. W. Kadel, T. Kamon, S. Kanda, D. A. Kardelis, I. Karliner, E. Kearns, R. Kephart, P. Kesten, H. Keutelian, S. Kim, L. Kirsch, K. Kondo, U. Kruse, S. E. Kuhlmann, A. T. Laasanen, W. Li, T. Liss, N. Lockyer, F. Marchetto, R. Markeloff, L. A. Markosky, P. McIntyre, A. Menzione, T. Meyer, S. Mikamo, M. Miller, T. Mimashi, S. Miscetti, M. Mishina, S. Miyashita, N. Mondal, S. Mori, Y. Morita, A. Mukherjee, C. Newman-Holmes, J. Ng, L. Nodulman, R. Paoletti, A. Para, J. Patrick, T. J. Phillips, H. Piekarz, R. Plunkett, L. Pondrom, J. Proudfoot, G. Punzi, D. Quarrie, K. Ragan, G. Redlinger, J. Rhoades, F. Rimondi, L. Ristori, T. Rohaly, A. Roodman, A. Sansoni, R. Sard, V. Scarpine, P. Schlabach, E. E. Schmidt, P. Schoessow, M. H. Schub, R. Schwitters, A. Scribano, S. Segler, M. Sekiguchi, P. Sestini, M. Shapiro, M. Sheaff, M. Shibata, M. Shochet, J. Siegrist, P. Sinervo, J. Skarha, D. A. Smith, F. D. Snider, R. St. Denis, A. Stefanini, Y. Takaiwa, K. Takikawa, D. Theriot, A. Tollestrup, G. Tonelli, W. Trischuk, Y. Tsay, F. Ukegawa, D. Underwood, R. Vidal, R. G. Wagner, R. L. Wagner, J. Walsh, T. Watts, R. Webb, T. Westhusing, S. White, A. Wicklund, H. H. Williams, T. Yamanouchi, A. Yamashita, K. Yasuoka, G. P. Yeh, J. Yoh, and F. Zetti (CDF Collaboration)
aArgonne National Laboratory, Argonne, Illinois 60439
bBrandeis University, Waltham, Massachusetts 02254
cUniversity of Chicago, Chicago, Illinois 60637
dFermi National Accelerator Laboratory, Batavia, Illinois 60510
eLaboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, Frascate, Italy
fHarvard University, Cambridge, Massachusetts 02138
gUniversity of Illinois, Urbana, Illinois 61801
hNational Laboratory for High Energy Physics (KEK) Tsukuba-gun, Ibaraki-ken 305, Japan
iLawrence Berkeley Laboratory, Berkeley, California 94720
jUniversity of Pennsylvania, Philadelphia, Pennsylvania 19104
kIstituto Nazionale di Fisica, Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, Italy
lPurdue University, West Lafayette, Indiana 47907
mRockefeller University, New York, New York 10021
nRutgers University, Piscataway, New Jersey 08854
oTexas A&M University, College Station, Texas 77843
pUniversity of Tsukuba, Ibaraki 305, Japan
qUniversity of Wisconsin, Madison, Wisconsin 53706
Received 25 January 1991; published in the issue dated 1 August 1991
A measurement of the QCD jet-broadening parameter 〈QT〉 is described for high-ET jet data in the central calorimeter of the Collider Detector at Fermilab. As an alternate approach to clustering analysis, this method involves the use of a global event parameter which is free from the ambiguities associated with the definition and separation of individual clusters. The parameter QT is defined as the scalar sum of the transverse momentum perpendicular to the transverse thrust axis. Parton-level QCD predictions are made for 〈QT〉 as a function of ET, the total transverse energy in the events, and suggest that a measurement would show a dependence on the running of the strong coupling constant αs. Comparisons are made to first-order QCD parton-level calculations, as well as to fully evolved and hadronized leading-log simulations. The data are well described by the QCD predictions.
© 1991 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.44.601
DOI:
10.1103/PhysRevD.44.601
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