5 research outputs found
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A First measurement of the interaction cross-section of the tau neutrino
The DONuT experiment collected data in 1997 and published first results in 2000 based on four observed {nu}{sub {tau}} charged-current (CC) interactions. The final analysis of the data collected in the experiment is presented in this paper, based on 3.6 x 10{sup 17} protons on target using the 800 GeV Tevatron beam at Fermilab. The number of observed {nu}{sub {tau}} CC interactions is 9, from a total of 578 observed neutrino interactions. We calculated the energy-independent part of the tau-neutrino CC cross section ({nu} + {bar {nu}}), relative to the well-known {nu}{sub e} and {nu}{sub {mu}} cross sections. The ratio {sigma}({nu}{sub {tau}})/{sigma}({nu}{sub e,{mu}}) was found to be 1.37 {+-} 0.35 {+-} 0.77. The {nu}{sub {tau}} CC cross section was found to be 0.72 {+-} 0.24 {+-} 0.36 x 10{sup -38} cm{sup 2} GeV{sup -1}. Both results are in agreement with expectations from the Standard Model
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Charge-separated atmospheric neutrino-induced muons in the MINOS far detector
We found 140 neutrino-induced muons in 854.24 live days in the MINOS far detector, which has an acceptance for neutrino-induced muons of 6.91 x 10{sup 6} cm{sup 2} sr. We looked for evidence of neutrino disappearance in this data set by computing the ratio of the number of low momentum muons to the sum of the number of high momentum and unknown momentum muons for both data and Monte Carlo expectation in the absence of neutrino oscillations. The ratio of data and Monte Carlo ratios, R, is R = 0.65{sub 0.12}{sup +0.15}(stat) {+-} 0.09(syst), a result that is consistent with an oscillation signal. A fit to the data for the oscillation parameters sin{sup 2} 2{theta}{sub 23} and {Delta}m{sub 23}{sup 2} excludes the null oscillation hypothesis at the 94% confidence level. We separated the muons into {mu}{sup -} and {mu}{sup +} in both the data and Monte Carlo events and found the ratio of the total number of {mu}{sup -} to {mu}{sup +} in both samples. The ratio of those ratios, {cflx R}{sub CPT}, is a test of CPT conservation. The result {cflx R}{sub CPT} = 0.72{sub -0.18}{sup +0.24}(stat){sub -0.04}{sup +0.08}(syst), is consistent with CPT conservation
Research and Development for Near Detector Systems Towards Long Term Evolution of Ultra-precise Long-baseline Neutrino Experiments
With the discovery of non-zero value of mixing angle, the next generation of long-baseline neutrino (LBN) experiments offers the possibility of obtaining statistically significant samples of muon and electron neutrinos and anti-neutrinos with large oscillation effects. In this document we intend to highlight the importance of Near Detector facilities in LBN experiments to both constrain the systematic uncertainties affecting oscillation analyses but also to perform, thanks to their close location, measurements of broad benefit for LBN physics goals. A strong European contribution to these efforts is possible
Research and Development for Near Detector Systems Towards Long Term Evolution of Ultra-precise Long-baseline Neutrino Experiments
With the discovery of non-zero value of mixing angle, the next
generation of long-baseline neutrino (LBN) experiments offers the possibility
of obtaining statistically significant samples of muon and electron neutrinos
and anti-neutrinos with large oscillation effects. In this document we intend
to highlight the importance of Near Detector facilities in LBN experiments to
both constrain the systematic uncertainties affecting oscillation analyses but
also to perform, thanks to their close location, measurements of broad benefit
for LBN physics goals. A strong European contribution to these efforts is
possible