ATLAS

Abstract:

A study of the particle multiplicity between jets with large rapidity separation has been performed using the D0 detector at the Fermilab Tevatron pp¯ Collider operating at √s = 1.8 TeV. A significant excess of low-multiplicity events is observed above the expectation for color-exchange processes. The measured fractional excess is 1.07±0.10(stat)+0.25−0.13(syst)%, which is consistent with a strongly interacting color-singlet (colorless) exchange process and cannot be explained by electroweak exchange alone. A lower limit of 0.80% (95% C.L.) is obtained on the fraction of dijet events with color-singlet exchange, independent of the rapidity gap survival probability. © 1996 The American Physical Society.

Abstract:

A measurement of the mass of the W boson is presented based on a sample of 5982 W → eν decays observed in pp¯ collisions at √s = 1.8 TeV with the D0 detector during the 1992-1993 run. From a fit to the transverse mass spectrum, combined with measurements of the Z boson mass, the W boson mass is measured to be MW = 80.350 ± 0.140(stat) ± 0.165(syst) ± 0.160(scale) GeV/c2. © 1996 The American Physical Society.

Abstract:

Diffractive scattering of γ^∗p → X + N, where N is either a proton or a nucleonic system with MN < 4 GeV has been measured in deep inelastic scattering (DIS) at HERA. The cross section was determined by a novel method as a function of the γ^∗p c.m. energy W between 60 and 245 GeV and of the mass MX of the system X up to 15 GeV at average Q² values of 14 and 31 GeV². The diffractive cross section dσ^{di f f} /dMX is, within errors, found to rise linearly with W. Parameterizing the W dependence by the form dσ^{di f f} /dMX ∞ (W²)^{(2αIP - 2)} the DIS data yield for the pomeron trajectory αIP = 1.23±0.02(stat)±0.04(syst) averaged over t in the measured kinematic range assuming the longitudinal photon contribution to be zero. This value for the pomeron trajectory is substantially larger than αIP extracted from soft interactions. The value of αIP measured in this analysis suggests that a substantial part of the diffractive DIS cross section originates from processes which can be described by perturbative QCD. From the measured diffractive cross sections the diffractive structure function of the proton F2 ^D(3) (β,Q², xIP) has been determined, where β is the momentum fraction of the struck quark in the pomeron. The form F2 ^D(3) = constant·(1/xIP)^a gives a good fit to the data in all β and Q² intervals with a = 1.46 ± 0.04(stat) ± 0.08(syst).

Abstract:

We present results from a search for anomalous WW and WZ production in pp¯ collisions at √s = 1.8 TeV. We used pp¯ → evjjX events observed during the 1992-1993 run of the Fermilab Tevatron collider, corresponding to an integrated luminosity of 13.7 ± 0.7pb−1. A fit to the transverse momentum spectrum of the W boson yields direct limits on the CP-conserving anomalous WWγ and WWZ coupling parameters of −0.9 < Δk < 1.1 (with λ = 0) and −0.6 < λ < 0.7 (with Δk = 0) at the 95% confidence level, for a form factor scale Λ = 1.5 TeV, assuming that the WWγ and WWZ coupling parameters are equal. © 1996 The American Physical Society.