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Vertex triggering using time difference measurements in the ZEUS Central Tracking Detector

Nuclear Inst. and Methods in Physics Research, A 279:1-2 (1989) 290-296

Authors:

N Harnew, GP Heath, MD Jeffs, J Nash, GL Salmon, PD Shield, DJ White, FF Wilson

Abstract:

A method of vertex triggering which uses a time difference measurement to determine the z coordinate of a track is under development for the ZEUS Central Tracking Detector. This incorporates a pipelined readout system. We describe the system and report on its performance. © 1989.

DEVELOPMENT OF THE ZEUS CENTRAL TRACKING DETECTOR

NUCL INSTRUM METH A 283:3 (1989) 477-483

Authors:

CB BROOKS, FW BULLOCK, RJ CASHMORE, RC DEVENISH, B FOSTER, TJ FRASER, MD GIBSON, RS GILMORE, D GINGRICH, N HARNEW, JC HART, GP HEATH, J HIDDLESTON, AR HOLMES, AK JAMDAGNI, TW JONES, TJ LLEWELLYN, KR LONG, GJ LUSH, J MALOS, NC MARTIN, I MCARTHUR, NA MCCUBBIN, D MCQUILLAN, DB MILLER, MM MOBAYYEN, C MORGADO, J NASH, G NIXON, AG PARHAM, BT PAYNE, JHC ROBERTS, G SALMON, DH SAXON, AJ SEPHTON, D SHAW, TB SHAW, PD SHIELD, J SHULMAN, I SILVESTER, S SMITH, DE STRACHAN, RJ TAPPER, SM TKACZYK, LW TOUDUP, EW WALLIS, R WASTIE, J WELLS, DJ WHITE, FF WILSON, KL YEO

THE TECHNIQUE OF ZETA-COORDINATE DETERMINATION USING A TIME-DIFFERENCE MEASUREMENT FOR THE ZEUS CENTRAL TRACKING DETECTOR

NUCL INSTRUM METH A 283:3 (1989) 781-785

Authors:

N HARNEW, J NASH, GL SALMON, PD SHIELD, MD JEFFS, AG PARHAM, DJ WHITE

Measurement of the strong coupling constant αs from a study of W Bosons produced in association with jets

Physics Letters B 215:1 (1988) 175-185

Authors:

R Ansari, P Bagnaia, M Banner, R Battiston, K Bernlöhr, CN Booth, K Borer, KM Borghini, G Carboni, V Cavasinni, P Cenci, JC Chollet, AG Clark, C Conta, C Corona, F Costantini, P Darriulat, B De Lotto, T Del Prete, L Di Lella, J Dines-Hansen, K Einsweiler, L Fayard, R Ferrari, M Fraternali, D Froidevaux, JM Gaillard, O Gildemeister, VG Goggi, C Gössling, B Hahn, H Hänni, JR Hansen, P Hansen, K Hara, N Harnew, E Hugentobler, E Iacopini, L Iconomidou-Fayard, K Jacobs, P Jenni, EE Kluge, O Kofoed-Hansen, S Lami, E Lançon, P Lariccia, M Livan, S Loucatos, B Madsen, B Mansoulié, GC Mantovani, L Mapelli, K Meier, B Merkel, R Möllerud, M Moniez, R Moning, M Morganti, C Onions, T Pal, MA Parker, G Parrour, F Pastore, M Pepe, C Petridou, H Plothow-Besch, M Polverel, L Rasmussen, JP Repellin, A Rimoldi, A Roussarie, V Ruhlmann, G Sauvage, J Schacher, S Stapnes, F Stocker, M Swartz, J Teiger, SN Tovey, WY Tsang, M Valdata-Nappi, V Vercesi, AR Weidberg, M Wunsch, H Zaccone

Abstract:

The UA2 experiment at the CERN pp Collider has identified a total sample of 251 W→eν events. Among this sample 221 events are found without jets and 29 with one jet. The yield of one-jet events relative to that of zero-jet events provides a measurement of the strong coupling constant: αs(Mw 2)=0.13±0.03(stat) ±0.03±(syst1)±0.02(²õ²â²õ³Ù2), where syst1 represents the experimental systematic error and syst2 is an estimate of the theoretical uncertainty. © 1988.

Direct photon production in {Mathematical expression} in collisions at {Mathematical expression} GeV

Zeitschrift für Physik C Particles and Fields 41:3 (1988) 395-404

Authors:

R Ansari, P Bagnaia, M Banner, R Battiston, K Bernlöhr, C Booth, K Borer, M Borghini, G Carboni, V Cavasinni, P Cenci, JC Chollet, AG Clark, C Conta, C Corona, F Costantini, P Darriulat, B De Lotto, T Del Prete, L Di Lella, J Dines Hansen, K Einsweiler, L Fayard, R Ferrari, M Fraternali, D Froidevaux, JM Gaillard, O Gildemeister, VG Goggi, C Gössling, B Hahn, H Hänni, JR Hansen, P Hansen, K Hara, N Harnew, H Hugentobler, E Iacopini, L Iconomidou-Fayard, K Jakobs, P Jenni, EE Kluge, O Kofoed-Hansen, S Lami, E Lançon, P Lariccia, M Livan, S Loucatos, B Madsen, B Mansoulié, GC Mantovani, L Mapelli, K Meier, B Merkel, R Møllerud, M Moniez, R Moning, M Morganti, C Onions, T Pal, MA Parker, G Parrour, F Pastore, M Pepe, C Petridou, H Plothow-Besch, M Polverel, L Rasmussen, JP Repellin, A Roussarie, V Ruhlmann, G Sauvage, J Schacher, S Stapnes, F Stocker, M Swartz, J Teiger, WY Tsang, M Valdata-Nappi, V Vercesi, AR Weidberg, M Wunsch, H Zaccone

Abstract:

A measurement of the direct production of photons with high transverse momentum from {Mathematical expression} collisions at {Mathematical expression} GeV is presented. The structure of events containing a high transverse momentum photon is studied. The results 91̽»¨ predictions from QCD theory. © 1988 Springer-Verlag.