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

Arnison, G.; Allkofer, O. C.; Astbury, A.; Aubert, B.; Bacci, C.; Batley, R.; Bauer, G.; Bezaguet, A.; Bock, R. K.; Bowcock, T. J. V.; Buckley, E. J.; Calvetti, M.; Catz, P.; Cennini, P.; Centro, S.; Ceradini, F.; Ciapetti, G.; Cittolin, S.; Cline, D.; Cochet, C.; Colas, J.; Corden, M.; Dallman, D.; Dau, D.; Debeer, M.; Della Negra, M.; Demoulin, M.; Denegri, D.; Dibitonto, D.; Di Ciaccio, A.; Dobrzynski, L.; Dorenbosch, J.; Dowell, J. D.; Edgecock, R.; Eggert, K.; Eisenhandler, E.; Ellis, N.; Erhard, P.; Faissner, H.; Fincke, M.; Flynn, P.; Fontaine, G.; Frey, R.; Fruhwirth, R.; Garvey, J.; Geer, S.; Ghesquiere, C.; Ghez, P.; Giboni, K. L.; Gibson, W. R.; Giraud Heraud, Y.; Givernaud, A.; Gonidec, A.; Grayer, G.; Guryn, W.; Hansl Kozanecka, T.; Haynes, W. J.; Hertzberger, L. O.; Hoffmann, D.; Hoffmann, H.; Holthuizen, D. J.; Homer, R. J.; Honma, A.; Jank, W.; Jorat, G.; Kalmus, P. I. P.; Karimaki, V.; Keeler, R.; Kenyon, I.; Kernan, A.; Kinnunen, R.; Kozanecki, W.; Kryn, D.; Kyberd, P.; Lacava, Francesco; Laugier, J. P.; Lees, J. P.; Lehmann, H.; Leuchs, R.; Leveque, A.; Linglin, D.; Locci, E.; Loret, M.; Markiewicz, T.; Maurin, G.; Mcmahon, T.; Mendiburu, J. P.; Minard, M. N.; Mohammadi, M.; Morgan, K.; Moricca, M.; Nandi, A. K.; Naumann, L.; Norton, A.; Orkin Lecourtois, A.; Paoluzi, L.; Pauss, F.; Piano Mortari, G.; Pietarinen, E.; Pimia, M.; Pitman, D.; Placci, A.; Porte, J. P.; Radermacher, E.; Raja, R.; Ransdell, J.; Redelberger, T.; Reithler, H.; Revol, J. P.; Rich, J.; Rijssenbeek, M.; Roberts, C.; Rohlf, J.; Rossi, P.; Rubbia, C.; Sadoulet, B.; Sajot, G.; Salvini, G.; Sass, J.; Savoy Navarro, A.; Schinzel, D.; Scott, W.; Shah, T. P.; Sheer, I.; Smith, D.; Sobie, R.; Strauss, J.; Streets, J.; Sumorok, K.; Szoncso, F.; Tao, C.; Thompson, G.; Timmer, J.; Tscheslog, E.; Tuominiemi, J.; Van Eijk, B.; Vialle, J. P.; Vrana, J.; Vuillemin, V.; Wahl, H. D.; Watkins, P.; Wilson, J.; Wulz, C. E.; Wyatt, T.; Yvert, M.; Zanello, L.

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

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. © 1985.

Comparison of three-jet and two-jet cross sections in pp̄ collisions at the CERN SPS pp̄ collider / G., A., O. C., A., A., A., B., A., C., B., R., B., G., B., A., B., R. K., B., T. J. V., B., E. J., B., M., C., P., C., P., C., S., C., F., C., G., C., S., C., D., C., C., C., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 158:6(1985), pp. 494-504. [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

G. Arnison;O. C. Allkofer;A. Astbury;B. Aubert;C. Bacci;R. Batley;G. Bauer;A. Bezaguet;R. K. Bock;T. J. V. Bowcock;E. J. Buckley;M. Calvetti;P. Catz;P. Cennini;S. Centro;F. Ceradini;G. Ciapetti;S. Cittolin;D. Cline;C. Cochet;J. Colas;M. Corden;D. Dallman;D. Dau;M. Debeer;M. Della Negra;M. Demoulin;D. Denegri;D. Dibitonto;A. Di Ciaccio;L. Dobrzynski;J. Dorenbosch;J. D. Dowell;R. Edgecock;K. Eggert;E. Eisenhandler;N. Ellis;P. Erhard;H. Faissner;M. Fincke;P. Flynn;G. Fontaine;R. Frey;R. Fruhwirth;J. Garvey;S. Geer;C. Ghesquiere;P. Ghez;K. L. Giboni;W. R. Gibson;Y. Giraud Heraud;A. Givernaud;A. Gonidec;G. Grayer;W. Guryn;T. Hansl Kozanecka;W. J. Haynes;L. O. Hertzberger;D. Hoffmann;H. Hoffmann;D. J. Holthuizen;R. J. Homer;A. Honma;W. Jank;G. Jorat;P. I. P. Kalmus;V. Karimaki;R. Keeler;I. Kenyon;A. Kernan;R. Kinnunen;W. Kozanecki;D. Kryn;P. Kyberd;LACAVA, Francesco;J. P. Laugier;J. P. Lees;H. Lehmann;R. Leuchs;A. Leveque;D. Linglin;E. Locci;M. Loret;T. Markiewicz;G. Maurin;T. Mcmahon;J. P. Mendiburu;M. N. Minard;M. Mohammadi;K. Morgan;M. Moricca;A. K. Nandi;L. Naumann;A. Norton;A. Orkin Lecourtois;L. Paoluzi;F. Pauss;G. Piano Mortari;E. Pietarinen;M. Pimia;D. Pitman;A. Placci;J. P. Porte;E. Radermacher;R. Raja;J. Ransdell;T. Redelberger;H. Reithler;J. P. Revol;J. Rich;M. Rijssenbeek;C. Roberts;J. Rohlf;P. Rossi;C. Rubbia;B. Sadoulet;G. Sajot;G. Salvini;J. Sass;A. Savoy Navarro;D. Schinzel;W. Scott;T. P. Shah;I. Sheer;D. Smith;R. Sobie;J. Strauss;J. Streets;K. Sumorok;F. Szoncso;C. Tao;G. Thompson;J. Timmer;E. Tscheslog;J. Tuominiemi;B. Van Eijk;J. P. Vialle;J. Vrana;V. Vuillemin;H. D. Wahl;P. Watkins;J. Wilson;C. E. Wulz;T. Wyatt;M. Yvert;L. Zanello

1985

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: 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. © 1985.

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	Anno di pubblicazione
	
				1985
			
	Tipologia
	
				01 Pubblicazione su rivista::01a Articolo in rivista
			
	Citazione
	
				Comparison of three-jet and two-jet cross sections in pp̄ collisions at the CERN SPS pp̄ collider / G., A., O. C., A., A., A., B., A., C., B., R., B., G., B., A., B., R. K., B., T. J. V., B., E. J., B., M., C., P., C., P., C., S., C., F., C., G., C., S., C., D., C., C., C., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 158:6(1985), pp. 494-504. [10.1016/0370-2693(85)90801-9]
			
	Appartiene alla tipologia:
	
				01a Articolo in rivista

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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/486232

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