This paper reports measurements of the hadrons produced in the inelastic scattering of 147-GeV muons by protons and deuterons in an experiment carried out at Fermi National Accelerator Laboratory. Both the scattered muon and the hadrons were measured in a large spectrometer Properties of the hadron spectra are presented for proton, deuteron, and neutron targets and compared with theoretical models and with hadron spectra from related processes Emphasis is placed on the quark-parton model and the data are found to be in substantial agreement with it. The average transverse momentum of the hadrons with respect to the virtual photon direct~on shows no dependence on the muon scattering variables. The data display "jet behavior" of the inclusive hadrons comparable to that found in e+e-annihilat~ons.

An enhancement has been observed in the inclusive cross section for direct single electrons produced in e*e~ annihilations at the T(4S). This is interpreted as evidence for a new weakly decaying particle, the B meson. A branching ratio for B -Xev of ll3± 3 (±3)]% is inferred, where the first set of errors is statistical and the estimated systematic error is enclosed in parentheses.PACS numbers: 14.40.Pe, 13.20.Jf, 13.65.+ iThe recently discovered resonance in e*e~ annihilations at 10.55 GeV total energy 1 ' 2 has a natural interpretation as the T (4S) bound state of bfi quarks. Its width indicates that this state is above the threshold for producing pairs of B mesons, bound states of b quarks with u or i? quarks, and has as its dominant decay mode BB meson final states. 3 The existence of a new, weakly decaying flavor can be inferred from the semileptonic decay B-+Xlv and the branching ratio (BR) for this 84

We have studied the production of p and $ J mesons from muon scattering on a liquidhydrogen target at 150 and 100 GeV. For the p we observe a skewed mass distribution which becomes somewhat more normal with increasing Q 2 (the square of the fourmomentum transferred from the muon), and an exponential distribution in t (the square of the four-momentum transferred to the target proton) with a slope which is consistent with a slight decrease as Q2 increases. The dependence of the cross section on Q2 follows that of the square of the p propagator with little contribution from longitudinal p production. The angular distribution of the p decay confirms the smallness of the contribution from longitudinal p production at our energies. The cross section when extrapolated to Q2=0 agrees with that measured in real photoproduction. The decay angular distribution of the p decay shows that s-channel helicity is largely conserved, although we detect a helicity-single-flip contribution at the 10-15 %.level. Natural-parity exchange in the t channel dominates, and the transverse and longitudinal amplitudes are found to be in phase. These characteristics are consistent with the diffractive nature of the vectordominance model. The t distribution of # production is also exponential, although less steep than that for the p. We observe an elastically produced four-pion state at a mass of approximately 1600 MeV. We identify this state with the pf(1600), and find it to be produced with a distribution exponential in t.

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