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Determination of sin{superscript 2} theta {subscript W} in neutrino-nucleon scattering at the NuTeV

Description: We report the determination of sin{sup 2}{theta}{sub W} in {nu}-N deep inelastic scattering from the NuTeV experiment. Using separate neutrino and anti-neutrino beams, NuTeV is able to extract sin{sup 2}{theta}{sub W} with low systematic errors from the Paschos-Wolfenstein variable R{sup -}, a ratio of differences of neutrino and anti-neutrino neutral-current and charged-current cross-sections. NuTeV measures sin{sup 2}{theta}{sub W} {sup (on - shell)} = 0.2253 {+-} 0.0019(stat) {+-} 0.0010(syst), which implies M{sub W}= 80.26 {+-} 0.11 GeV.
Date: April 29, 1999
Creator: al., R. Bernstein et
Partner: UNT Libraries Government Documents Department

A Measurement of {chi}F{nu over 3}-{chi}F{nubar over 3} and R with the CCFR Detector

Description: We report on a measurement of the neutrino-nucleon and antineutrino-nucleon differential cross sections in the CCFR detector. The measurement of the differential cross sections over a wide range of energies allows {Delta}xF<sub>3</sub> = xF<sup>{nu}</sup><sub>3</sub> -xF<sup>{anti {nu}}</sup><sub>3</sub> and R to be extracted. {Delta}xF</sub>3</sub> is related to the difference between the contributions of the strange and charm seas in the nucleon to production of massive charm quark. The results for {Delta}xF</sub>3</sub> are compared to various massive charm NLO QCD models. The Q&sup2; dependence of R for x < 0.1 has been measured for the first time.
Date: July 12, 1999
Creator: al., U.K. Yang et
Partner: UNT Libraries Government Documents Department

Jefferson Lab: Experimental Facilities, Upgrade Plans and Potential for Research Related to Neutrino-Nucleus Interactions

Description: The electron accelerator at Jefferson Lab (Jlab) presently produces 100% duty factor beams at energies up to 6 GeV for use in 3 endstations with a variety of detectors. Plans are presently being made for an energy upgrade to 12 GeV along with new and upgraded experimental equipment. Possibilities of using JLab facilities to make measurements of relevance to neutrino-nucleus interactions are discussed.
Date: December 1, 2001
Creator: Wood, Stephen A.
Partner: UNT Libraries Government Documents Department

Determination of {alpha}{ sub s}} and Measurements of R{sub L}, k and |V{sub cs}| from {nu} - N DIS at CCFR

Description: We present recent QCD results in {nu}-N scattering at the Fermilab CCFR experiment. We present the latest Next-to-Next-to-Leading order strong coupling constant, {alpha}s , extracted from Gross-Llewellyn-Smith sum rule. The value of {alpha}s from this measurement, at the mass of Z boson, is {alpha}{sup NNLO}{sub s} (M{sup 2}{sub Z} ) = 0:114 {sup +0 : 009}{sub -0.012} Measurements of charged current neutrino and anti-neutrino nucleon interactions in the CCFR detector are used to extract the structure functions, F2, xF{sup {nu}}{sub 3} , xF{sup {anti{nu}}}{sub 3} and R(longitudinal) in the kinematic region 0:01 < x < 0:6 and 1 < Q 2 < 300 GeV{sup 2}. The new measurements of R in the x < 0:1 region provide a constraint on the level of the gluon distribution. The x and Q{sup 2} dependence of R is compared with a QCD based fit to previous data. The CKM matrix element jVcs j is extracted from a combined analysis of xF3 and dimuon data.
Date: October 1, 1998
Creator: al., Jae Yu et
Partner: UNT Libraries Government Documents Department

Strange sea and alpha {sub s} measurements from nu - N deep inelastic scattering at CCFR/NuTeV

Description: We present the latest Next-to-Next-Leading order strong coupling constant, {alpha}{sub s}, extracted from Gross-Llewellyn-Smith sum rule. The value of {alpha}{sub s} from this measurement, at the mass of Z boson, is {alpha}{sub s}{sup NNLO} (M{sup 2}{sub Z}) = 0.114{sup +0.009}{sub -0.012}. We discuss the previous strange sea quark measurement from the CCFR experiment and the prospects for improvements of the measurement in the NuTeV experiment.
Date: August 1, 1998
Creator: Yu, J. & Collaboration, CCFR /NuTeV
Partner: UNT Libraries Government Documents Department

Measurements of the longitudinal structure function and |V{sub cs}| in the CCFR experiment

Description: Measurements of charged current neutrino and anti-neutrino nucleon interactions in the CCFR detector are used to extract the structure functions, F{sub 2}, xF{sub 3}{sup {nu}} , xF{sub 3}{sup {anti {nu}}} and R(longitudinal) in the kinematic region 0.01 < x < 0.6 and 1 < Q{sup 2} < 300 GeV{sup 2}. The new measurements of R in the x < 0.1 region provide a constraint on the level of the gluon distribution. The x and Q{sup 2} dependence of R is compared with a QCD based fit to previous data. The CKM matrix element {vert_bar}V{sub cs}{vert_bar} is extracted from a combined analysis of xF{sub 3} and dimuon data.
Date: July 1, 1998
Creator: Yang, U.K.
Partner: UNT Libraries Government Documents Department

Recent QCD results in {nu} - N deep-inelastic-scattering at CCFR/NUTEV

Description: We present recent QCD results in {nu}-N scattering at the Fermilab CCFR/NuTeV experiments. We present the latest Next-to-Next-Leading order strong coupling constant, {alpha}{sub s}, extracted from Gross-Llewellyn-Smith sum rule. The value of {alpha}{sub s} from this measurement, at the mass of Z boson, is {alpha}{sub s}{sup NNLO}(M{sub Z}{sup 2})=0.114{sub -0.012}{sup +0.009}. We also present a preliminary result of the CCFR F{sub 2} at large-x. This measurement of F{sub 2} is compared to other experiments and various models that provide nuclear effects. We discuss the previous strange sea quark measurement from the CCFR experiment and the prospects for improvements of the measurement in the NuTeV experiment.
Date: August 1, 1998
Creator: Yu, Jaehoon
Partner: UNT Libraries Government Documents Department

MIGHTY MURINES: NEUTRINO PHYSICS AT VERY HIGH ENERGY MUON COLLIDERS

Description: An overview is given of the potential for neutrino physics studies through parasitic use of the intense high energy neutrino beams that would be produced at future many-TeV muon colliders. Neutrino experiments clearly cannot compete with the collider physics. Except at the very highest energy muon colliders, the main thrust of the neutrino physics program would be to improve on the measurements from preceding neutrino experiments at lower energy muon colliders, particularly in the fields of B physics, quark mixing and CP violation. Muon colliders at the 10 TeV energy scale might already produce of order 10{sup 8} B hadrons per year in a favorable and unique enough experimental environment to have some analytical capabilities beyond any of the currently operating or proposed B factories. The most important of the quark mixing measurements at these energies might well be the improved measurements of the important CKM matrix elements {vert_bar}V{sub ub}{vert_bar} and {vert_bar}V{sub cb}{vert_bar} and, possibly, the first measurements of {vert_bar}V{sub td}{vert_bar} in the process of flavor changing neutral current interactions involving a top quark loop. Muon colliders at the highest center-of-mass energies that have been conjectured, 100--1,000 TeV, would produce neutrino beams for neutrino-nucleon interaction experiments with maximum center-of-mass energies from 300--1,000 GeV. Such energies are close to, or beyond, the discovery reach of all colliders before the turn-on of the LHC. In particular, they are comparable to the 314 GeV center-of-mass energy for electron-proton scattering at the currently operating HERA collider and so HERA provides a convenient benchmark for the physics potential. It is shown that these ultimate terrestrial neutrino experiments, should they eventually come to pass, would have several orders of magnitude more luminosity than HERA. This would potentially open up the possibility for high statistics studies of any exotic particles, such as leptoquarks, that might have been ...
Date: May 5, 2000
Creator: KING,B.J.
Partner: UNT Libraries Government Documents Department

Precision measurement of sin(squared) {theta}{sub W} from {nu}-N scattering at NuTeV and direct measurements of M{sub W}

Description: We present the preliminary result of sin{sup 2}{theta}{sub W} from {nu}-N deep inelastic scattering experiment, NuTeV, at Fermilab. This measurement of sin{sup 2}{theta}{sub W} comes from measuring the Paschos-Wolfenstein parameter R=({sigma}{sup {nu}}{sub NC}-{sigma}{sup {anti {nu}}}{sub NC}), using separate beams of {nu} and {anti {nu}}, utilizing the SSQT. The resulting value of sin{sup 2}{theta}{sub W}{sup on-shell} is 0.2253 {+-} 0.0019(stat) {+-} 0.0010(syst). This value is equivalent to the mass of the W boson, M{sub W} = 80.26 {+-} 0.11 GeV/c{sup 2}. We also summarize the direct measurements of M{sub W} from the Tevatron {anti p}p collider experiments, D0 and CDF. Combining these two direct measurements yields M{sub W} = 80.37 {+-} 0.08 GeV/c{sup 2}.
Date: August 1, 1998
Creator: Yu, J.
Partner: UNT Libraries Government Documents Department

Tests of the Hardware and Software for the Reconstruction of Trajectories in the Experiment MINERvA

Description: MINERvA experiment has a highly segmented and high precision neutrino detector able to record events with high statistic (over 13 millions in a four year run). MINERvA uses FERMILAB NuMI beamline. The detector will allow a detailed study of neutrino-nucleon interactions. Moreover, the detector has a target with different materials allowing, for the first time, the study of nuclear effects in neutrino interactions. We present here the work done with the MINERvA reconstruction group that has resulted in: (a) development of new codes to be added to the RecPack package so it can be adapted to the MINERvA detector structure; (b) finding optimum values for two of the MegaTracker reconstruction package variables: PEcut = 4 (minimum number of photo electrons for a signal to be accepted) and Chi2Cut = 200 (maximum value of {chi}{sup 2} for a track to be accepted); (c) testing of the multi anode photomultiplier tubes used at MINERvA in order to determine the correlation between different channels and for checking the device's dark counts.
Date: May 1, 2009
Creator: Palomino Gallo, Jose Luis & /Rio de Janeiro, CBPF
Partner: UNT Libraries Government Documents Department

Updated electroweak measurements from neutrino-nucleon deeply inelastic scattering at CCFR

Description: We report the results of a study of electroweak parameters from observations of neutral current {nu}N deeply inelastic scattering in the CCFR detector at the FNAL Tevatron Quadrupole Triplet neutrino beam. An improved extraction of the weak mixing angle in the on-shell renormalization scheme, incorporating additional data and with an improved technique for constraining systematic errors, is presented. Within the Standard Model, this result constrains the W mass with a precision comparable to that from direct measurements. The result is also presented in a model-independent form, as constraints on neutral current quark-neutrino couplings, to facilitate comparisons with theories outside the Standard Model. Using this result, limits on new four-fermion interactions, lepto-quarks and neutrino oscillations are presented. Prospects for a successor experiment, NuTeV (FNAL-E815), are also presented.
Date: August 1, 1996
Creator: McFarland, K.S. & Collaboration, CCFR /NuTeV
Partner: UNT Libraries Government Documents Department

Search for fourth generation neutral heavy leptons

Description: A search for fourth generation neutral heavy leptons ({nu}{sub 4}) in W decays was carried out the D0 detector at the Fermilab Tevatron at {radical}{bar s} = 1.8 TeV. The {nu}{sub 4} is assumed to be produced via mixing with the first generation neutrino only. We looked for a three electron final state event topology. The data used in this analysis represent 12.2 pb{sup {minus}1} taken during the 1992--1993 run. No candidates were found. We set a preliminary limit beyond the LEP limit for the considered mixing case on the {vert_bar}U{sub e4}{vert_bar}{sup 2} {minus} m{sub {nu}4} plane.
Date: July 1, 1995
Creator: Abachi, S.; Abbott, B.; Abolins, M. & Collaboration, D0
Partner: UNT Libraries Government Documents Department

A measurement of {alpha}{sub s}(Q{sup 2}) from the Gross Llewellyn Smith sum rule

Description: The Gross Llewellyn Smith sum rule has been measured at different values of four-momentum transfer squared (Q{sup 2}) by combining the precise CCFR neutrino data with data from other deep-inelastic scattering experiments at lower values of Q{sup 2}. A comparison with the {Omicron} ({alpha}{sub s}{sup 3}) predictions of perturbative QCD yields a determination of {alpha}{sub s} and its dependence on Q{sup 2} in the range 1GeV{sup 2} < Q{sup 2} < 20 GeV{sup 2}. Low Q{sup 2} tests have greater sensitivity to {alpha}{sub s} (M{sub Z}{sup 2}) than high Q{sup 2} tests, since at low Q{sup 2} {alpha}{sub s} is large and changing rapidly.
Date: June 1, 1995
Creator: Harris, D.A.; Auchincloss, P. & Arroyo, C.G.
Partner: UNT Libraries Government Documents Department

Neutrino Physics at a Muon Collider

Description: This paper gives an overview of the neutrino physics possibilities at a future muon storage ring, which can be either a muon collider ring or a ring dedicated to neutrino physics that uses muon collider technology to store large muon currents. After a general characterization of the neutrino beam and its interactions, some crude quantitative estimates are given for the physics performance of a muon ring neutrino experiment (MURINE) consisting of a high rate, high performance neutrino detector at a 250 GeV muon collider storage ring. The paper is organized as follows. The next section describes neutrino production from a muon storage rings and gives expressions for event rates in general purpose and long baseline detectors. This is followed by a section outlining a serious design constraint for muon storage rings: the need to limit the radiation levels produced by the neutrino beam. The following two sections describe a general purpose detector and the experimental reconstruction of interactions in the neutrino target then, finally, the physics capabilities of a MURINE are surveyed.
Date: February 1998
Creator: King, B. J.
Partner: UNT Libraries Government Documents Department

A Search for Neutrino Induced Coherent NC($\pi^{0}$) Production in the MINOS Near Detector

Description: The production of single, highly forward {pi}{sup 0} mesons by NC coherent neutrino-nucleus interactions ({nu}{sub {mu}} + N {yields} {nu}{sub {mu}} + N + {pi}{sup 0}) is a process which probes fundamental aspects of the weak interaction. This reaction may also pose as a limiting background for long baseline searches for {nu}{sub {mu}} {yields} {nu}{sub e} oscillations if the neutrino mixing angle {theta}{sub 13} is very small. The high-statistics sample of neutrino interactions recorded by the MINOS Near Detector provides an opportunity to measure the cross section of this coherent reaction on a relatively large-A nucleus at an average E{sub {nu}} = 4.9 GeV. A major challenge for this measurement is the isolation of forward-going electromagnetic (EM) showers produced by the relatively rare coherent NC({pi}{sup 0}) process amidst an abundant rate of incoherently produced EM showers. The backgrounds arise from single {pi}{sup 0} dominated NC events and also from quasi-elastic-like CC scattering of electron neutrinos. In this Thesis the theory of coherent interactions is summarized, and previous measurements of the coherent NC({pi}{sup 0}) cross section are reviewed. Then, methods for selecting a sample of coherent NC({pi}{sup 0}) like events, extracting the coherent NC({pi}{sup 0}) event rate from that sample, estimating the analysis uncertainties, and calculating a cross section, are presented. A signal for neutrino-induced NC({pi}{sup 0}) production is observed in the relevant kinematic regime as an excess of events of three standard deviations above background. The reaction cross sections, averaged over an energy window of 2.5 {&lt;=} E{sub {nu}} {&lt;=} 9.0 GeV is determined to be (31.6{+-}10.5) x 10{sup -40} cm{sup 2}/nucleus. The result is the first evidence obtained for neutrino-nucleus coherent NC({pi}{sup 0}) scattering on iron, and is the first measurement on an average nuclear target above A = 30. The cross section measurement is in agreement with NEUGEN3 ...
Date: November 1, 2010
Creator: Cherdack, Daniel David & U., /Tufts
Partner: UNT Libraries Government Documents Department

Neutral current neutrino-nucleon scattering

Description: It may appear unusual to have a contribution on neutrino scattering at a school devoted to electromagnetic probes, as the neutrino has no known electromagnetic couplings. However, as a means to examine the hidden flavor currents in the nucleon, the recent results observed for the spin structure function of the nucleon have focused attention on the nucleon`s neutral weak currents (NWC). When an electromagnetic probe is scattered elastically from a nucleon, the NWC interactions are observable only through the detection of very small (> 10{sup {minus}6}) parity-violating processes. In the case of neutrino scattering, the NWC is the dominant coupling. In what follows it will be shown how the nucleon`s vector and axial vector form factors arising from strange quark currents can be measured via neutrino elastic scattering. Preliminary results from the Large Scintillation Neutrino Detector (LSND) at LAMPF will be presented as well as a recent analysis of an earlier experiment (E734) carried out at Brookhaven.
Date: January 1, 1995
Creator: Garvey, G. T.
Partner: UNT Libraries Government Documents Department

Neutrino-nucleon scattering

Description: In the following, the author tries to summarize the current status of neutrino-nucleon scattering as it bears on contemporary issues regarding the spin structure of the nucleon. It is straightforward to express the electroweak current of a hadron in terms of its underlying electroweak partonic currents. The matrix elements of these currents are, of course, presently uncalculable but may be characterized by form factors extracted from experiment. When neutrinos are used as probes, there are several problems associated with carrying out the required cross section measurements. Active neutrino detectors of necessity contain nuclei more complex than hydrogen. These nuclei create additional backgrounds and create complications of interpretation that make these experiments challenging. However, given the continued demonstrated difficulty of measuring and extracting the spin structure functions, it appears that there are no easy measurements to investigate the nucleon spin structure save the earlier experiments that fixed the axial vector form factors of well-known baryon decays (neutron, lambda, etc.). With the emergence of the provocative results from the EMC group on the spin structure function of the proton, there has been renewed interest in the information contained in the cross sections for neutral current neutrino-nucleon scattering. The theoretical background for describing this process has been worked out in detail. It is presented in briefest outline below to define the terms needed to describe experimental results.
Date: May 1, 1994
Creator: Garvey, G. T.
Partner: UNT Libraries Government Documents Department

Intermediate energy semileptonic probes of the hadronic neutral current

Description: The present status and future prospects of intermediate-energy semileptonic neutral current studies are reviewed. Possibilities for using parity-violating electron scattering from nucleons and nuclei to study hadron structure and nuclear dynamics are emphasized, with particular attention paid to probes of strangeness content in the nucleon. Connections are drawn between such studies and tests of the electroweak gauge theory using electron or neutrino scattering. Outstanding theoretical issues in the interpretation of semileptonic neutral current measurements are highlighted and the prospects for undertaking parity-violating electron or neutrino scattering experiments in the near future are surveyed.
Date: June 1, 1993
Creator: Musolf, M. J.; Donnelly, T. W.; Dubach, J.; Pollock, S. J.; Kowalski, S. & Beise, E. J.
Partner: UNT Libraries Government Documents Department

Neutrino radiation hazards: A paper tiger

Description: Neutrinos are present in the natural environment due to terrestrial, solar, and cosmic sources and are also produced at accelerators both incidentally and intentionally as part of physics research programs. Progress in fundamental physics research has led to the creation of beams of neutrinos of ever-increasing intensity and/or energy. The large size and cost associated with these beams attracts, and indeed requires, public interest, support, and some understanding of the `exotic` particles produced, including the neutrinos. Furthermore, the very word neutrino (`little neutral one`, as coined by Enrico Fermi) can lead to public concern due to confusion with `neutron`, a word widely associated with radiological hazards. Adding to such possible concerns is a recent assertion, widely publicized, that neutrinos from astronomical events may have led to the extinction of some biological species. Presented here are methods for conservatively estimating the dose equivalent due to neutrinos as well as an assessment of the possible role of neutrinos in biological extinction processes. It is found that neutrinos produced by the sun and modern particle accelerators produce inconsequential dose equivalent rates. Examining recent calculations concerning neutrinos incident upon the earth due to stellar collapse, it is concluded that it is highly unlikely that these neutrinos caused the mass extinctions of species found in the paleontological record. Neutrino radiation hazards are, then, truly a `paper tiger`. 14 refs., 1 fig., 1 tab.
Date: September 1, 1996
Creator: Cossairt, J.D.; Grossman, N.L. & Marshall, E.T.
Partner: UNT Libraries Government Documents Department

Measurement of the absolute v<sub>μ</sub>-CCQE cross section at the SciBooNE experiment

Description: This thesis presents the measurement of the charged current quasi-elastic (CCQE) neutrino-nucleon cross section at neutrino energies around 1 GeV. This measurement has two main physical motivations. On one hand, the neutrino-nucleon interactions at few GeV is a region where existing old data are sparse and with low statistics. The current measurement populates low energy regions with higher statistics and precision than previous experiments. On the other hand, the CCQE interaction is the most useful interaction in neutrino oscillation experiments. The CCQE channel is used to measure the initial and final neutrino fluxes in order to determine the neutrino fraction that disappeared. The neutrino oscillation experiments work at low neutrino energies, so precise measurement of CCQE interactions are essential for flux measurements. The main goal of this thesis is to measure the CCQE absolute neutrino cross section from the SciBooNE data. The SciBar Booster Neutrino Experiment (SciBooNE) is a neutrino and anti-neutrino scattering off experiment. The neutrino energy spectrum works at energies around 1 GeV. SciBooNE was running from June 8th 2007 to August 18th 2008. In that period, the experiment collected a total of 2.65 x 10<sup>20</sup> protons on target (POT). This thesis has used full data collection in neutrino mode 0.99 x 10<sup>20</sup> POT. A CCQE selection cut has been performed, achieving around 70% pure CCQE sample. A fit method has been exclusively developed to determine the absolute CCQE cross section, presenting results in a neutrino energy range from 0.2 to 2 GeV. The results are compatible with the NEUT predictions. The SciBooNE measurement has been compared with both Carbon (MiniBoonE) and deuterium (ANL and BNL) target experiments, showing a good agreement in both cases.
Date: July 1, 2010
Creator: Aunion, Jose Luis Alcaraz
Partner: UNT Libraries Government Documents Department