Showing papers by "S. R. Mishra published in 1989"
TL;DR: The fundamental Bjorken sum rule has not yet been tested, but the recent measurement by EMC may well lead to a new understanding of the nucleon spin among the constituents as mentioned in this paper.
Abstract: Experiments on deep inelastic scattering have demonstrated the validity of the electroweak theory and the quark structure of nucleons. Experiments are in the process of testing the predictions of QCD. The fundamental Bjorken sum rule has not yet been tested, but the recent measurement by EMC may well lead to a new understanding of the nucleon spin among the constituents. Neutrino experiments will have to reach a new level of precision to distinguish between competing theoretical models.(AIP)
32 citations
TL;DR: The measurement supports the structure of the weak current, left-handed two-component neutrinos, and a cross section rising linearly with respect to the center-of-mass energy.
Abstract: We report on a measurement of inverse muon decay /nu//sub /mu//+e/r arrow//mu//sup /minus//+/nu//sub e/ at the Fermilab Tevatron. A sample of 1151 inverse-/mu/-decay events, produced by neutrinos with laboratory energy in the range 15/le//ital E//sub /nu///le/600 GeV, is extracted. We measure the rate of this reaction with respect to the /nu//sub /mu//-/ital N/ charged-current interaction to be (0.125/plus minus/0.009(stat)/plus minus/0.003(syst))/times/10/sup /minus/2/. The measurement supports /ital V/---/ital A/ structure of the weak current, left-handed two-component neutrinos, and a cross section rising linearly with respect to the center-of-mass energy.
7 citations
TL;DR: In this article, an upper bound on the rate of wrong-sign single muon production relative to δ-charged current interactions was derived, and the rate and kinematic properties of these events were compared with those of the neutrino-induced opposite-sign dimuon events.
Abstract: We report on a search forv
μ-induced events where the single emerging muon carries lepton number opposite that of the incident neutrino. The rate and kinematic quantities of the candidate events are compared with known backgrounds from
$$\bar v_\mu $$
-induced charged current interactions and ν-induced interactions that produce dileptons. We derive an upper limit on the rate of wrong-sign single muon production relative to the rate ofv
μ charged current interactions to be 1.6×10−4 fory 0.5 (90% CL). These upper limits enable us to constrain exotic sources of wrong-sign muons such as the charm component of the nucleon sea, flavor changing neutral currents and lepton number violating processes. Finally, the rate and kinematic properties of these events are compared with those of the neutrino-induced opposite-sign dimuon events.
5 citations
01 Jan 1989
TL;DR: In this article, the authors report on a new high energy neutrino scattering experiment (FNAL E744) by the CCFR Collaboration, and present a preliminary analysis of 1529 neutrinos produced- and 284 antineutrino produced µ+µ- events.
Abstract: We report here on a new high energy neutrino scattering experiment (FNAL E744) by the CCFR Collaboration, and present a preliminary analysis of 1529 neutrino produced- and 284 antineutrino produced µ+µ- events. These dimuons, with visible energy in the range 30 – 600 GeV, are part of a sample of about 794,000 charged-current events. The events are used to extract the strange quark magnitude and shape, and the semileptonic branching ratio of charm.
1 citations
01 Jan 1989
TL;DR: In this article, measurements of v µ e − → µ- v e (inverse muon decay, IMD), v µ N → µ −Nµ+vµ (coherent trilepton production, CTP), and also a search for vµN → X N µ → X µ+µ-v´ (neutral heavy lepton, NHL) are presented.
Abstract: The wide-band, high energy neutrino beam at the Fermilab Tevatron has made possible the observation of several electroweak processes with relatively high statistics. We present here measurements of v µ e- → µ- v e (inverse muon decay, IMD), v µ N → µ-Nµ+vµ (coherent trilepton production, CTP), and also a search for vµN → X N µ → X µ+µ-vµ (a particular case of neutral heavy lepton, NHL). These data are from a preliminary analysis of 670,000 neutrino- and 124,000 antineutrino scattering events, with visible energy in the range 30 – 600 GeV, observed by experiment FNAL E744, the CCFR Collaboration.