58 research outputs found
Evidence of Color Coherence Effects in W+jets Events from ppbar Collisions at sqrt(s) = 1.8 TeV
We report the results of a study of color coherence effects in ppbar
collisions based on data collected by the D0 detector during the 1994-1995 run
of the Fermilab Tevatron Collider, at a center of mass energy sqrt(s) = 1.8
TeV. Initial-to-final state color interference effects are studied by examining
particle distribution patterns in events with a W boson and at least one jet.
The data are compared to Monte Carlo simulations with different color coherence
implementations and to an analytic modified-leading-logarithm perturbative
calculation based on the local parton-hadron duality hypothesis.Comment: 13 pages, 6 figures. Submitted to Physics Letters
The B^- -> phi phi K^- decay rate with phi phi invariant mass below charm treshold
We investigate the decay mechanism in the B^- -> phi phi K^- decay with the
phi phi invariant mass below the charm threshold and in the neighborhood of the
eta_c invariant mass region. Our approach is based on the use of factorization
model and the knowledge of matrix elements of the weak currents. For the B
meson weak transition we apply form factor formalism, while for the light
mesons we use effective weak and strong Lagrangians. We find that the dominant
contributions to the branching ratio come from the eta, eta' and eta(1490) pole
terms of the penguin operators in the decay chains B^- -> eta (eta', eta(1490))
K^- -> phi phi K^-. Our prediction for the branching ratio is in agreement with
the Belle's result.Comment: 14 pages, 4 figures, 2 table
Search for electroweak production of single top quarks in collisions.
We present a search for electroweak production of single top quarks in the electron+jets and muon+jets decay channels. The measurements use ~90 pb^-1 of data from Run 1 of the Fermilab Tevatron collider, collected at 1.8 TeV with the DZero detector between 1992 and 1995. We use events that include a tagging muon, implying the presence of a b jet, to set an upper limit at the 95% confidence level on the cross section for the s-channel process ppbar->tb+X of 39 pb. The upper limit for the t-channel process ppbar->tqb+X is 58 pb. (arXiv
- …