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Measurement of the partial width of the decay of the Z0 into charm quark pairs

Physics Letters B 252:1 (1990) 140-148

Authors:

P Abreu, W Adam, F Adami, T Adye, GD Alekseev, P Allen, S Almehed, F Alted, SJ Alvsvaag, U Amaldi, E Anassontzis, WD Apel, B Asman, P Astier, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, G Barbiellini, DY Bardin, A Baroncelli, O Barring, W Bartl, MJ Bates, M Baubillier, KH Becks, CJ Beeston, P Beilliere, I Belokopytov, P Beltran, D Benedic, JM Benlloch, M Berggren, D Bertrand, S Biagi, F Bianchi, JH Bibby, MS Bilenky, P Billoir, J Bjarne, D Bloch, PN Bogolubov, D Bollini, T Bolognese, M Bonapart, M Bonesini, PSL Booth, M Boratay, P Borgeaud, H Borner, C Bosio, O Botner, B Bouquet, M Bozzo, S Braibant, P Branchini, KD Brand, RA Brenner, C Bricman, RCA Brown, N Brummer, JM Brunet, L Bugge, T Buran, H Burmeister, JAMA Buytaert, M Caccia, M Calvi, AJ Camacho Rozas, JE Campagne, A Campion, T Camporesi, V Canale, F Cao, L Carroll, C Caso, E Castelli, MV Castillo Gimenez, A Cattai, FR Cavallo, L Cerrito, P Charpentier, P Checchia, GA Chelkov, L Chevalier, P Chliapnikov, V Chorowicz, R Cirio, MP Clara, JL Contreras, R Contri, G Cosme, F Couchot, HB Crawley, D Crennell, M Cresti, G Crosetti, N Crosland, M Crozon

Abstract:

A determination of the partial width Γc c ̄ of the Z0 boson into charm quark pairs is presented, based on a total sample of 36 900 Z0 hadronic decays measured with the DELPHI detector at the LEP collider. The production rate of cc̄ events is derived from the inclusive analysis of charged pions coming from the decay of charmed meson D*+→D0π+ and D*-→ D ̄0 π- where the π± is constrained by kinematics to have a low pT with respect to the axis. The probability to produce these π± from D*± decay in cc̄ events is taken to be 0.31 ±_0.05 as measured at √s=10.55 GeV. The measured relative partial width Γc c ̄ Γh = 0.162± 0.030 (stat.) ±0.050 (syst.) is in good agreement with the standard moel value of 0.171. Together with our previous measurement of the total hadronic width Γh this implies Γc c ̄ = 282±53 (stat.)±88(syst.) MeV. © 1990.
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LEPTOQUARK PRODUCTION AT THE LHC/LEP E-P COLLIDER

90 (1990) 1022-1032
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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.
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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
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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
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