-
M. Bonesini,
E. Bonvin,
P. S. L. Booth,
R. Bopp,
L. J. Carroll,
A. J. Cass,
D. Cavalli,
S. U. Chung,
G. Costa,
M. Donnat, [......],
L. Perini,
D. Perrin,
G. Polesello,
R. Poultney,
W. H. Range,
L. Rosselet,
S. W. Snow,
A. S. Thompson,
R. M. Turnbull, M. Werlen
[show abstract]
[hide abstract]
ABSTRACT: The inclusive cross sections for production by the interactions of 280 GeV/c momentum –, +, and proton beams in hydrogen have been measured. The kinematical range covered is –0.45x
F
P
T
x
F
and transverse momentum respectively. The to 0 cross section ratios are given for the three reactions. The ratio of –
p to +
p cross sections for production in the above kinematic ranges is 1.220.080.11.
Zeitschrift für Physik C 11/1989; 42(4):527-532.
-
E. Bonvin,
R. Bopp,
L. J. Carroll,
A. J. Cass,
S. U. Chung,
M. Donnat,
P. A. Dorsaz,
M. E. Feliks,
L. Fluri,
J. N. Jackson, [......],
L. Mathys,
P. J. Negus,
L. Perini,
R. Poultney,
W. H. Range,
L. Rosselet,
S. W. Snow,
A. S. Thompson,
R. M. Turnbull, M. Werlen
[show abstract]
[hide abstract]
ABSTRACT: A search for pairs of highp
T prompt photons produced in hydrogen by a 280 GeV/c incident
- beam has been carried out using a fine-grained electromagnetic calorimeter and the Omega spectrometer at the CERN SPS. Clear evidence for the existence of such events is found with a six standard deviation signal forp
T
>3.0 GeV/c. The cross-sections are consistent with beyond leading order QCD calculations. A discussion on the determination of
s
is also presented.
Zeitschrift für Physik C 11/1989; 41(4):591-598.
-
M. Bonesini,
E. Bonvin,
R. Bopp,
L. J. Carroll,
A. J. Cass,
D. Cavalli,
G. Costa,
S. U. Chung,
M. Donnat,
P. A. Dorsaz, [......],
L. Perini,
D. Perrin,
R. W. Poultney,
W. H. Range,
L. Rosselet,
S. W. Snow,
A. S. Thompson,
R. M. Turnbull,
J. Wells, M. Werlen
[show abstract]
[hide abstract]
ABSTRACT: The structure of events associated with the production of direct photons in –
p, +
p andpp reactions of 280 GeV/c has been studied using data from the WA 70 experiment at the CERN SPS. Results are presented on the distributions of the fractional momenta of the colliding partons and on the fragmentation of the recoil jet and a comparison is made with predictions using the structure functions of Duke and Owens in the Lund Monte Carlo with string fragmentation.
Zeitschrift für Physik C 02/1989; 44(1):71-78.
-
M. Bonesini,
E. Bonvin,
P. S. L. Boóth,
D. Bortoletto,
L. J. Carroll,
A. J. Cass,
D. Cavalli,
G. Costa,
M. Donnat,
P. A. Dorsaz, [......],
D. Perrin,
G. Polesello,
W. H. Range,
L. Rosselet,
S. W. Snow,
M. Tamborini,
A. S. Thompson,
R. M. Turnbull,
J. Wells, M. Werlen
[show abstract]
[hide abstract]
ABSTRACT: The inclusive cross sections for prompt photon production by – and + on protons have been measured with a beam momentum of 280 GeV/c using a fine grained electromagnetic calorimeter and the CERN Omega spectrometer. The transverse momentum and Feynmanx
F
ranges covered are 4.0p
T
x
F
Zeitschrift für Physik C 11/1988; 37(4):535-544.
-
P. Béné,
M. Bonesini,
E. Bonvin,
J. Bovier,
L.J. Carroll,
A.J. Cass,
D. Cavalli,
G. Cecchet,
G. Costa,
M. Donnat, [......],
W.H. Range,
J.-P. Richeux,
L. Rosselet,
A. Rückstuhl,
J. Rutschmann,
S.W. Snow,
A.S. Thompson,
R.M. Turnbull,
J. Wells, M. Werlen
[show abstract]
[hide abstract]
ABSTRACT: A trigger system has been designed and built to select events containing high pT electromagnetic showers detected in a large calorimeter with orthogonal readout. The electronics include analog adders with up to 123 inputs, pulse shapers with 20 ns integration time, 100 MHz flash ADCs and ECL loop-up tables. The total number of input channels is 3072 and the trigger decision is made in about 120 ns.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.
-
M. Bonesini,
E. Bonvin,
P.S.L. Booth,
D. Bortoletto,
L.J. Carroll,
A.J. Cass,
D. Cavalli,
G. Cecchet,
G. Costa,
M. Donnat, [......],
E. Perrin,
W.H. Range,
L. Rosselet,
J. Rutschmann,
S.W. Snow,
M. Tamborini,
A.S. Thompson,
R.M. Turnbull,
J. Wells, M. Werlen
[show abstract]
[hide abstract]
ABSTRACT: A fine-grained sampling electromagnetic calorimeter using liquid scintillator contained in teflon tubes, its associated electronics and reconstruction programs, as used in an experiment on direct photons at CERN, are described. The performance of the system based on three years of operation is discussed.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.
-
E Bonvin,
Rudolf Bopp,
L J Carroll,
A J Cass,
S U Chung,
Michel Donnat,
P A Dorsaz,
E Durieux,
M E J Feliks,
L Fluri, [......],
M Martin,
L Mathys,
P J Negus,
R Poultney,
W H Range,
L Rosselet,
S W Snow,
A S Thompson,
R M Turnbull, M Werlen
-
E Bonvin,
Rudolf Bopp,
L J Carroll,
A J Cass,
S U Chung,
Michel Donnat,
P A Dorsaz,
M E J Feliks,
L Fluri,
J N Jackson, [......],
L Mathys,
P J Negus,
L Perini,
R Poultney,
W H Range,
L Rosselet,
S W Snow,
A S Thompson,
R M Turnbull, M Werlen
-
E Bonvin,
Rudolf Bopp,
L J Caroll,
A J Cass,
Michel Donnat,
P A Dorsaz,
E Durieux,
M E J Feliks,
L Fluri,
J N Jackson, [......],
M Martin,
L Mathys,
P J Negus,
R Poultney,
W H Range,
L Rosselet,
S W Snow,
A S Thompson,
R M Turnbull, M Werlen
-
M Bonesini,
E Bonvin,
P S L Booth,
L J Carroll,
D Cavalli,
G. Cecchet,
G Costa,
P A Dorsaz,
D N Edwards,
J R Fischer, [......],
D Perrin,
W H Range,
J Rutschmann,
L Rosselet,
S W Snow,
M Tamborini,
A S Thompson,
R M Turnbull,
J Wells, M Werlen
-
M Bonesini,
E Bonvin,
P S L Booth,
Daniela Bortoletto,
L J Carroll,
A J Cass,
D Cavalli,
G Costa,
Michel Donnat,
P A Dorsaz, [......],
S Pensotti-Rancoita,
L Perini,
D Perrin,
W H Range,
L Rosselet,
S W Snow,
A S Thompson,
R M Turnbull,
J Wells, M Werlen
-
M Bonesini,
E Bonvin,
P S L Booth,
Daniela Bortoletto,
L J Carroll,
A J Cass,
D Cavalli,
G Costa,
Michel Donnat,
P A Dorsaz, [......],
D Perrin,
G Polesello,
W H Range,
L Rosselet,
S W Snow,
M Tamborini,
A S Thompson,
R M Turnbull,
J Wells, M Werlen
-
M Bonesini,
E Bonvin,
P S L Booth,
L J Carroll,
A J Cass,
D Cavalli,
G. Cecchet,
G Costa,
Michel Donnat,
P A Dorsaz, [......],
D Perrin,
W H Range,
L Rosselet,
J Rutschmann,
S W Snow,
M Tamborini,
A S Thompson,
R M Turnbull,
J Wells, M Werlen
-
P. Béné,
M Bonesini,
E Bonvin,
J Bovier,
L J Carroll,
A J Cass,
D Cavalli,
G. Cecchet,
G Costa,
Michel Donnat, [......],
W H Range,
J. P. Richeux,
L Rosselet,
A Rückstuhl,
J Rutschmann,
S W Snow,
A S Thompson,
R M Turnbull,
J Wells, M Werlen
-
M Bonesini,
E Bonvin,
P S L Booth,
Rudolf Bopp,
L J Carroll,
A J Cass,
D Cavalli,
S U Chung,
G Costa,
Michel Donnat, [......],
L Perini,
D Perrin,
G Polesello,
R Poultney,
W H Range,
L Rosselet,
S W Snow,
A S Thompson,
R M Turnbull, M Werlen
-
M Bonesini,
E Bonvin,
P S L Booth,
L J Carroll,
A J Cass,
D Cavalli,
G. Cecchet,
G Costa,
Michel Donnat,
P A Dorsaz, [......],
L Perini,
D Perrin,
G Polesello,
W H Range,
L Rosselet,
S W Snow,
A S Thompson,
R M Turnbull,
J Wells, M Werlen
-
M Bonesini,
E Bonvin,
L J Carroll,
A J Cass,
D Cavalli,
G Costa,
Michel Donnat,
P A Dorsaz,
D N Edwards,
J R Fischer, [......],
S Pensotti-Rancoita,
L Perini,
D Perrin,
W H Range,
L Rosselet,
S W Snow,
A S Thompson,
R M Turnbull,
J Wells, M Werlen
-
M Bonesini,
E Bonvin,
Daniela Bortoletto,
P S L Booth,
L J Carroll,
A J Cass,
D Cavalli,
G. Cecchet,
G Costa,
Michel Donnat, [......],
L Perini,
W H Range,
L Rosselet,
J Rutschmann,
S W Snow,
M Tamborini,
A S Thompson,
R M Turnbull,
J Wells, M Werlen
-
E. Bonvin,
R. Bopp,
L.J. Carroll,
A.J. Cass,
S.U. Chung,
M. Donnat,
P.A. Dorsaz,
E. Durieux,
M.E. Feliks,
L. Fluri, [......],
M. Martin,
L. Mathys,
P.J. Negus,
R. Poultney,
W.H. Range,
L. Rosselet,
S.W. Snow,
A.S. Thompson,
R.M. Turnbull, M. Werlen
[show abstract]
[hide abstract]
ABSTRACT: The correlation between the two high transverse momentum (pt2.75 GeV/c) photons of the reaction π−p→γγX is studied at the beam momentum of 280 GeV/c. QCD calculations beyond leading logarithms are not sufficient to explain the width of the distributions and the effects due to intrinsic transverse momentum of the incident partons are discussed.
Physics Letters B.