E760 constants from 1991 run

BEAM

Diameter: 5 mm (for 95% containment)
Peak luminosity achieved: 1.0 x 10^31 cm^-2 s^-1
Lifetime: 50-90 hours depending on the energy of the beam
Momentum spread: < 2 x 10^-4
Momentum spread for etac: 1.5 x 10^-3

(source: J/psi and psi' Phys.Rev.D paper)

TARGET

Diameter: 6.3 mm (for 95% containment)
Typical density: 3.5 x 10^13 atoms/cm^2

(source: J/psi and psi' Phys.Rev.D paper)

LUMINOSITY

Statistical error: < 0.5%
Systematic errors:
Counter area: 1.5%
Differential cross section uncertainty: 2.5%

(source: S.Trokenheim)

CCAL

Averaged energy resolution: sigma/E = 0.01 + 0.06/sqrt(E) E in GeV
Averaged theta resolution (sigma): 6 mrad
Averaged phi resolution (sigma): 12 mrad

(source: J.Fast's thesis study with psis)

FCAL

Energy resolution: sigma/E = 0.19/sqrt(E) E in GeV
Position resolution: Dx = Dy = 3 cm (r.m.s.)

(source: A.Majewska's thesis)

TRACKING

Averaged theta resolution: 4 mrad (r.m.s.)
Averaged phi resolution: 7 mrad (r.m.s.)

(source: chi1,chi2 Nucl.Phys. paper)

E835 Home Page