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Vbfnlo is a fully flexible parton level Monte Carlo program for the simulation of vector boson fusion, double and triple vector boson production in hadronic collisions at next-to-leading order in the strong coupling constant. Vbfnlo includes Higgs and vector boson decays with full spin correlations and all off-shell effects. In addition, Vbfnlo implements(More)
A search for the decay of the charmed meson Do t K’e+eis presented, based on data collected at the $(3770) resonance with the Mark III detector at SPEAR. No evidence for this process is found, resulting in an upper limit on the decay branching ratio of 1.7 x 10m3 at the 90% confidence level. Invited paper contributed to the XXIVth International Conference(More)
We outline a new formalism for dipole-type parton showers which maintain exact energy-momentum conservation at each step of the evolution. Particular emphasis is put on the coherence properties, the level at which recoil effects do enter and the role of transverse momentum generation from initial state radiation. The formulated algorithm is shown to(More)
We calculate next-to-leading order (NLO) QCD corrections to electroweak Higgs boson plus three jet production. Both vector boson fusion (VBF) and Higgs-strahlung type contributions are included along with all interferences. The calculation is implemented within the Matchbox NLO framework of the Herwig++ event generator.
Measurements of the branching ratios of ten Cabibbo suppressed hadronic weak decays of the II+ and Do are presented from data collected with the Mark III detector at SPEAR. In addition to the previously observed channels Do --) K-K+ and T-T+, we report new measurements of Do + r-rr+~O and ?r-n+rr-7rlr+; and D+ + I?OK+ , TOT+, I?*‘(892)K+, r&r+, K-K+x+, and(More)
By measuring the substructure of a jet, one can assign it a “quark” or “gluon” tag. In the eikonal (double-logarithmic) limit, quark/gluon discrimination is determined solely by the color factor of the initiating parton (CF versus CA). In this paper, we confront the challenges faced when going beyond this leading-order understanding, using both(More)
R.M. Baltrusaitis, J. J. Becker, G.T. Blaylock, J.S. Brown, K.O. Bunnell, T.H. Burnett, R.E. C&sell, D. Coffman, V. Cook, D.H. Coward, S. Dado, D.E. Dorfan, G.P. Dubois, A.L. Duncan, K.F. Einsweiler, B.I. Eisenstein, R. Fabrizio, G. Gladding, F. Grancagnolo, R.P. Hamilton, J. Hauser, C.A. Heusch, D.G. Hitlin, L. Kiipke, W.S. Lockman, U. Ma&k, P.M. Mockett,(More)
  • R M Baltrusaitis, J J Becker, +49 authors W J Wis
  • 1984
In a study of 2.7 million J/q decays with the MARK III, a new magnetic detector at SPEAR, we have observed the sequential decay J/~/J -+ y,+, qc + &I$. The product branching fraction is (1.02 f 0.25 f 0.14) X 10W4, where the quoted errors are statistical and systematic, respectively. Analysis of the final state angular distributions provides the first(More)
We present measurements of the two-body decays of the J/~/J into a vector and a pseudoscalar meson. The data, taken with the Mark III detector at the SLAC e+estorage ring SPEAR, consist of 5.8 x lo6 produced J/+ ‘s. The branching ratios for the J/lc, decays into pr, pr], pq’, w7r”, WV, WV’, c$q, do’, and K*K are measured; an upper limit on J/T/J + &r” is(More)
Pairs of 7 leptons produced at fi = 3.77 GeV have been studied in ep, ee and pp final states. The leptonic branching ratios have been measured to be B(r ---) evv) = 18.2 f 0.7 f 0.5% and B( 7 + IVY) = 18.0 f 1.0 f 0.6%. Limits have been set for the two-body decays 7 -+ eG and 7 + pG, where G is a light Goldstone boson. Submitted to Physical Review Letters *(More)