We h a v e measured the B hadron energy distribution in Z 0 decays using a new technique applied to a sample of inclusive B decays recorded in the SLD experiment at SLAC b e t w een 1996 and 1997. The upgraded CCD vertex detector is used to reconstruct B-decay v ertices with high eeciency and purity, and to provide precise measurements of the kinematic quantities used in this technique. For eac...

The matrix elements of electroweak currents which occur in exclusive decays of heavy hadrons are evaluated in the nonperturbative light-cone Fock representration. In general, each semileptonic exclusive decay amplitude receives two contributions, a diagonal ∆n = 0 parton-number-conserving amplitude and a ∆n = −2 contribution in which a quark and an antiquark from the initial hadron Fock state a...

We investigate the muonic decay of a light Higgs boson, produced in weak boson fusion at future hadron colliders. We find that this decay mode would be observable at the CERN LHC only with an unreasonably large amount of data, while at a 200 TeV vLHC this process could be used to extract the muon Yukawa coupling to about the 10% level, or better if significant improvements in detector design ca...

The Neutrinos at the Main Injector (NuMI) facility is a conventional neutrino beam which produces muon neutrinos by focusing a beam of mesons into a long evacuated decay volume. We have built four arrays of ionization chambers to monitor the position and intensity of the hadron and muon beams associated with neutrino production at locations downstream of the decay volume. This article describes...

The decay mode Bs → ψK ∗ is suggested as a very good way to measure the Bs mixing parameter xs. These decays can be gathered using a ψ → l l trigger. This final state has a well resolved four track decay vertex, useful for good time resolution and background rejection. Presented at BEAUTY ’95 3rd International Workshop on B-Physics at Hadron Machines [email protected] [email protected]

Single W and single gamma productions which are sensitive to the trilinear gauge coupling WWγ have been studied at LEP. It is shown that single W production has particular sensitivity to the 'anomalous' magnetic moment κγ of the W boson, complementary to WW production at LEP and Wγ production at hadron colliders. The invisible decay of W boson has been searched and the limit on the invisible de...

We resum to next-to-leading order the distribution in the ratio of the invariant hadron mass mX to the total hadron energy EX and the distribution in mX in the semileptonic decays B → Xulν. By expanding our formulas, we obtain the coefficients of all the infrared logarithms at O(αS) and of the leading ones at O(α 3 S). We explicitly show that the relation between these semileptonic spectra and ...

Radiative decays of polarized Λb baryons represent an attractive possibility to measure the helicity of the photon emitted in the b → sγ quark transition and thus to subject the Standard Model to a stringent test at existing and future hadron colliders. The most abundant mode, Λ(1116)γ, is experimentally very challenging because of the long decay length of the Λ(1116). We show that the experime...

Lattice QCD was invented thirty years ago but only in the last few years has it finally fulfilled its promise as a precision tool for calculations in hadron physics. This review will cover the fundamentals of discretising QCD onto a space-time lattice and how to reduce the errors associated with the discretisation. This ‘improvement’ is the key that has made the enormous computational task of a...

The exchange of electroweak gauginos in the t− or u−channel allows squark pair production at hadron colliders without color exchange between the squarks. This can give rise to events where little or no energy is deposited in the detector between the squark decay products. We discuss the potential for detection of such rapidity gap events at the Large Hadron Collider (LHC). We present an analysi...