@article{f25c923e80604faf987f48cd851e8dd6,

title = "Comparison of three-jet and two-jet cross sections in p{\=p} collisions at the CERN SPS p{\=p} collider",

abstract = "Results are presented on two-jet and three-jet cross sections, measured in the UA1 experiment at the CERN Super Proton Synchrotron (SPS) p{\=p} Collider, at the highest available subprocess cms energies ( s{\^ }>150 GeV). Precise measurements of the two-jet angular distribution are consistent with previous results but show significant scale-breaking effects. The three-jet Dalitz plot and the three-jet angular distributions show evidence for final- and initial-state bremsstrahlung processes, in agreement with the leading-order QCD predictions. A comparison of the yield of wide-angle three-jet events with the yield of two-jet events at smaller scattering angles gives for the strong interaction coupling constant: αs( K3J K2J)=0.16±0.02±0.03 at Q2≈4000 GeV2, where the factor K3J K2J may plausibly be assumed to be close to unity.",

keywords = "High energy density physics, CERN collider",

author = "{UA1 Collaboration} and G. Arnison and Allkofer, {O. C.} and A. Astbury and B. Aubert and C. Bacci and R. Batley and G. Bauer and A. B{\'e}zaguet and Bock, {R. K.} and Bowcock, {T. J.V.} and Buckley, {E. J.} and M. Calvetti and P. Catz and P. Cennini and S. Centro and F. Ceradini and G. Ciapetti and S. Cittolin and D. Cline and C. Cochet and J. Colas and M. Corden and D. Dallman and D. Dau and M. Debeer and Negra, {M. Della} and M. Demoulin and D. Denegri and D. Dibitonto and {Di Ciaccio}, A. and L. Dobrzynski and J. Dorenbosch and Dowell, {J. D.} and R. Edgecock and K. Eggert and E. Eisenhandler and N. Ellis and P. Erhard and H. Faissner and M. Fincke and P. Flynn and G. Fontaine and R. Frey and R. Fr{\"u}hwirth and J. Garvey and S. Geer and C. Ghesqui{\`e}re and P. Ghez and Giboni, {K. L.} and Gibson, {W. R.}",

year = "1985",

month = sep,

day = "5",

doi = "10.1016/0370-2693(85)90801-9",

language = "English",

volume = "158",

pages = "494--504",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

number = "6",

}