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Checking T and CPT violation with sterile neutrino | | Yogita Pant
; Sujata Diwakar
; Jyotsna Singh
; R.B. Singh
; | | Date: |
14 Sep 2015 | | Abstract: | Post LSND results, sterile neutrinos have drawn attention and motivated the
high energy physics, astronomy and cosmology to probe physics beyond the
standard model considering minimal 3+1 (3 active and 1 sterile) to 3+N neutrino
schemes. The analytical equations for neutrino conversion probabilities are
devloped in this work for 3+1 neutrino scheme. Here we have tried to explore
the possible signals of T and CPT violations with four flavor neutrino scheme
at neutrino factory. To investigate the T violation we have taken into
consideration the golden and discovery channels. In our analysis the optimal
values of Jarlskog factor for discovery channel coming from the constrained
values of sterile parameters from long baseline and short baseline experiments
are 0.169 and 0.163 respectively. Whereas the values of Jarlskog factor for
golden channel are 0.0131 and 0.0143 coming from long and short baseline
constraints respectively. This obesrevation promotes discovery channel to be
the potential channel for probing T violation in 3+1 neutrino scheme. The CPT
violation is checked for the disappearance channel. We have pointed out the
obeservables which can distangle the sterile contribution from the rest of the
contributing factors in any observation. These observables promote setup with
baselines beyond 4000 km and energy range 9-12 GeV to check CPT violation. We
find that to observe CPT violation at 90\% C.L., the product of sterile angles
$ heta_{24} $ and $ heta_{34} $ can be constrained as
$ heta_{24}. heta_{34}gtrsim 0.006$ $rad^{2}$ with liquid argon detector and
with magnetized iron detector the constraint imposed is
$ heta_{24}. heta_{34}gtrsim 0.007$ $rad^{2}$. | | Source: | arXiv, 1509.4096 | | Services: | Forum | Review | PDF | Favorites | |
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