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"Bolton, Tim"
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Snowmass Topical Report: Underground Facilities for Neutrinos
This topical report of the 2021 US Community Study on the Future of Particle Physics (Snowmass 2021) summarizes the underground facilities needs for upcoming and next generation neutrino experiments. The underground facilities needs are discussed in the context of two broad categories: accelerator neutrinos, in particular with respect to the Deep Underground Neutrino Experiment (DUNE); and non-accelerator neutrinos, focusing on neutrinos from natural sources and on searches for neutrinoless double-beta decay.
Paper
Determining the CKM Parameter Vcd from nuN Charm Production
The formalism for extracting the CKM parameter \\(V_{cd}\\) from \\(\\nu N\\) production of charm is discussed in some detail. The various model assumptions needed are clearly pointed out. A direct determination from neutrino induced dimuon production requires \\(\\nu N\\) charm production data, \\(% \\nu N\\) charm hadronization data, and the semi-muonic branching ratios for charmed hadrons. Hadronization data from FNAL E531 is re-analyzed to take advantage of better-determined properties of the charmed hadrons. A small bias in the original published result is removed. Neutrino induced charm fragmentation is compared to \\(e^{+}e^{-}\\) charm fragmentation functions; the data are consistent with a common hadronization scheme. An updated value of the mean semi-muonic branching ratio for charmed hadrons produced in \\(\\nu N\\) scattering for \\(E_\\nu >30\\) GeV is obtained. This value is used to determine \\(% V_{cd}\\) and its associated uncertainties. Prospects for improving the \\(% V_{cd} \\) measurement to test the unitarity limit of the CKM matrix are described.
Paper
High Energy Muon Momentum Estimation from Multiple Coulomb Scattering in Dense Detectors
A method is described for estimating muon track momentum from the distribution of hits along tracks in dense calorimeters due to multiple Coulomb scattering (MCS). The method requires only well-aligned conventional drift chambers or similar tracking devices and can be implemented with or without a magnetic field present. Neutrino experiments can use this technique to increase acceptance for large angle charged-current scattering events. Resolutions in a typical detector geometry vary from ~10% at p=20 GeV/c to ~50% for p=500 GeV/c, if the number of hits on the track is sufficient.
Paper
LEAFLET-WRITING
CHE has no leaflet about homosexuality for general distribution. To remedy this, Jim Edgell produced a draft for discussion at Conference last year. A small group of members then agreed to get it into an acceptable form for publication.
Magazine Article
Action-- video bill
We must stop calling this the \"Video Nasties Bill\", for it isn't: under its proposals, all video recordings will have to be \"classified\" (another way of saying \"censored\") and the definitions are so vague that there's enormous scope for discriminatory action- a \"religious' tape condemning homosexuality might be passed but an 'educational' tape about the same subject could be restricted.
Magazine Article
Electroweak Physics Results from NuTeV
NuTeV has performed precise measurements of neutral-current to charged-current cross section ratios using intense high energy neutrino and anti-neutrino beams on a primarily steel target at the Fermilab Tevatron. A null hypothesis test of the standard model allows the extraction \\(\\sin^2\\theta_W^{\\nu N}(\\equiv 1-M_W^2/M_Z^2)=0.2277\\pm0.0013(stat)\\pm0.0009(syst)\\), a value that differs from predictions of global electroweak fits by \\(+3.0\\sigma\\).
Paper
Precision Measurements with High Energy Neutrino Beams
Neutrino scattering measurements offer a unique tool to probe the electroweak and strong interactions as described by the Standard Model (SM). Electroweak measurements are accessible through the comparison of neutrino neutral- and charged-current scattering. These measurements are complimentary to other electroweak measurements due to differences in the radiative corrections both within and outside the SM. Neutrino scattering measurements also provide a precise method for measuring the F_2(x,Q^2) and xF_3(x,Q^2 structure functions. The predicted Q^2 evolution can be used to test perturbative Quantum Chromodynamics as well as to measure the strong coupling constant, alpha _s, and the valence, sea, and gluon parton distributions. In addition, neutrino charm production, which can be determined from the observed dimuon events, allows the strange-quark sea to be investigated along with measurements of the CKM matrix element |V_{cd}| and the charm quark mass.
Paper
Extending Sensitivity for Low-Mass Neutral Heavy Lepton Searches
We point out the importance of two-body final states of weak isosinglet neutral heavy leptons predicted in several models of new physics beyond the standard model. We concentrate on muon-type neutral heavy leptons \\(L_\\mu^0\\) with mass \\(M<2\\) GeV which can be searched for with increased sensitivity at a new round of neutrino experiments at CERN and Fermilab. Providing explicit decay rate formulae for the \\(e e \\nu\\), \\(e\\mu \\nu\\), \\(\\mu \\mu \\nu\\), \\(\\pi \\mu\\), \\(\\rho \\mu\\), and \\(a_1\\mu\\) final states, we use general scaling features to estimate sensitivity of \\(L_\\mu^0\\) searches in current and future experiments, emphasizing the importance of the \\(\\pi \\mu\\) decay mode.
Paper