BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:A New Approach to Probe Non-Standard Interactions in Atmospheric N
 eutrino Experiments
DTSTART;VALUE=DATE-TIME:20210902T154500Z
DTEND;VALUE=DATE-TIME:20210902T160000Z
DTSTAMP;VALUE=DATE-TIME:20260411T170100Z
UID:indico-contribution-15632@indico.ific.uv.es
DESCRIPTION:Speakers: Anil Kumar (Institute of Physics\, Bhubaneswar)\nWe 
 propose a new approach to explore the  neutral-current non-standard neutri
 no interactions (NSI) in atmospheric neutrino experiments using oscillatio
 n dips and valleys in reconstructed muon observables\, at a detector like 
 ICAL that can identify the muon charge. We focus on the flavor-changing NS
 I parameter $\\varepsilon_{\\mu\\tau}$\, which has the maximum impact on t
 he muon survival probability in these experiments. We show that non-zero $
 \\varepsilon_{\\mu\\tau}$ shifts the oscillation dip locations in $L/E$ di
 stributions of the up/down event ratios of reconstructed $\\mu^-$ and $\\m
 u^+$ in opposite directions. We introduce a new variable $\\Delta d$ repre
 senting the difference of dip locations in $\\mu^-$ and $\\mu^+$\, which i
 s sensitive to the magnitude as well as the sign of $\\varepsilon_{\\mu\\t
 au}$\, and is independent of the value of $\\Delta m^2_{32}$. We further n
 ote that the oscillation valley in the ($E$\, $\\cos \\theta$) plane of th
 e reconstructed muon observables bends in the presence of NSI\, its curvat
 ure having opposite signs for $\\mu^-$ and $\\mu^+$. We demonstrate the id
 entification of NSI with this curvature\, which is feasible for detectors 
 like ICAL having excellent muon energy and direction resolutions. We illus
 trate how the measurement of contrast in the curvatures of valleys in $\\m
 u^-$ and $\\mu^+$ can be used to estimate $\\varepsilon_{\\mu\\tau}$. Usin
 g these proposed oscillation dip and valley measurements\, the achievable 
 precision on $|\\varepsilon_{\\mu\\tau}|$ at 90% C.L. is about 2% with 500
  kt$\\cdot$yr exposure. The effects of statistical fluctuations\, systemat
 ic errors\, and uncertainties in oscillation parameters have been incorpor
 ated using multiple sets of simulated data. Our method would provide a dir
 ect and robust measurement of $\\varepsilon_{\\mu\\tau}$ in the multi-GeV 
 energy range.\n\nhttps://indico.ific.uv.es/event/6178/contributions/15632/
LOCATION:
URL:https://indico.ific.uv.es/event/6178/contributions/15632/
END:VEVENT
END:VCALENDAR