Comparison of three-jet and two-jet cross sections in pp̄ collisions at the CERN SPS pp̄ collider

UA1 Collaboration; R. Edgecock

doi:10.1016/0370-2693(85)90801-9

Comparison of three-jet and two-jet cross sections in pp̄ collisions at the CERN SPS pp̄ collider

UA1 Collaboration, R. Edgecock

Research output: Contribution to journal › Article › peer-review

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Abstract

Results are presented on two-jet and three-jet cross sections, measured in the UA1 experiment at the CERN Super Proton Synchrotron (SPS) pp̄ 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: α_s( K_3J K_2J)=0.16±0.02±0.03 at Q²≈4000 GeV², where the factor K_3J K_2J may plausibly be assumed to be close to unity.

Original language	English
Pages (from-to)	494-504
Number of pages	11
Journal	Physics Letters B
Volume	158
Issue number	6
DOIs	https://doi.org/10.1016/0370-2693(85)90801-9
Publication status	Published - 5 Sept 1985
Externally published	Yes

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@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 B",

issn = "0370-2693",

publisher = "Elsevier BV",

number = "6",

}

TY - JOUR

T1 - Comparison of three-jet and two-jet cross sections in pp̄ collisions at the CERN SPS pp̄ collider

AU - UA1 Collaboration

AU - Arnison, G.

AU - Allkofer, O. C.

AU - Astbury, A.

AU - Aubert, B.

AU - Bacci, C.

AU - Batley, R.

AU - Bauer, G.

AU - Bézaguet, A.

AU - Bock, R. K.

AU - Bowcock, T. J.V.

AU - Buckley, E. J.

AU - Calvetti, M.

AU - Catz, P.

AU - Cennini, P.

AU - Centro, S.

AU - Ceradini, F.

AU - Ciapetti, G.

AU - Cittolin, S.

AU - Cline, D.

AU - Cochet, C.

AU - Colas, J.

AU - Corden, M.

AU - Dallman, D.

AU - Dau, D.

AU - Debeer, M.

AU - Negra, M. Della

AU - Demoulin, M.

AU - Denegri, D.

AU - Dibitonto, D.

AU - Di Ciaccio, A.

AU - Dobrzynski, L.

AU - Dorenbosch, J.

AU - Dowell, J. D.

AU - Edgecock, R.

AU - Eggert, K.

AU - Eisenhandler, E.

AU - Ellis, N.

AU - Erhard, P.

AU - Faissner, H.

AU - Fincke, M.

AU - Flynn, P.

AU - Fontaine, G.

AU - Frey, R.

AU - Frühwirth, R.

AU - Garvey, J.

AU - Geer, S.

AU - Ghesquière, C.

AU - Ghez, P.

AU - Giboni, K. L.

AU - Gibson, W. R.

PY - 1985/9/5

Y1 - 1985/9/5

N2 - Results are presented on two-jet and three-jet cross sections, measured in the UA1 experiment at the CERN Super Proton Synchrotron (SPS) pp̄ 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.

AB - Results are presented on two-jet and three-jet cross sections, measured in the UA1 experiment at the CERN Super Proton Synchrotron (SPS) pp̄ 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.

KW - High energy density physics

KW - CERN collider

UR - https://www.scopus.com/pages/publications/0001171593

U2 - 10.1016/0370-2693(85)90801-9

DO - 10.1016/0370-2693(85)90801-9

M3 - Article

AN - SCOPUS:0001171593

SN - 0370-2693

VL - 158

SP - 494

EP - 504

JO - Physics Letters B

JF - Physics Letters B

IS - 6

ER -

Comparison of three-jet and two-jet cross sections in pp̄ collisions at the CERN SPS pp̄ collider

Abstract

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