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Evidence for leptonic CP phase from NO nu A, T2K and ICAL
KTH, School of Engineering Sciences (SCI), Theoretical Physics.ORCID iD: 0000-0002-6401-1257
2016 (English)In: Pramana (Bangalore), ISSN 0304-4289, E-ISSN 0973-7111, Vol. 86, no 2, 387-393 p.Article in journal (Refereed) PublishedText
Abstract [en]

The phenomenon of neutrino oscillation is now well understood from the solar, atmospheric, reactor and accelerator neutrino experiments. This oscillation is characterized by a unitary PMNS matrix which is parametrized by three mixing angles (oee integral (12), oee integral (23) and oee integral (13)) and one phase (delta (CP)) known as the leptonic CP phase. Neutrino oscillation also involves two mass squared differences: the solar mass square difference () and the atmospheric mass square difference (). Though there is already significant amount of information about the three mixing angles, the CP phase is still unknown. Apart from the CP phase, one should also know what is the true nature of the neutrino mass hierarchy, i.e., normal (m (3)> m (1): NH) or inverted (m (1)> m (3): IH) and what is the true octant of oee integral (23), i.e., lower (oee integral (23)< 45(a similar to): LO) or higher (oee integral (23)> 45(a similar to): HO). The long-baseline experiments (LBL) have CP sensitivity coming from the appearance channel (). On the other hand, atmospheric neutrinos are known to have negligible CP sensitivity. In this work, we study the synergy between the LBL experiment NO nu A, T2K and the atmospheric neutrino experiment ICAL@INO for obtaining the first hint of CP violation in the lepton sector. We find that due to the lack of knowledge of hierarchy and octant, CP sensitivity of NO nu A/T2K is poorer for some parameter ranges. Addition of ICAL data to T2K and NO nu A can exclude these spurious wrong-hierarchy and /or wrong-octant solutions and cause a significant increase in the range of delta (CP) values for which a hint of CP violation can be achieved. Similarly, the precision with which delta (CP) can be measured also improves with the inclusion of ICAL data.

Place, publisher, year, edition, pages
Springer, 2016. Vol. 86, no 2, 387-393 p.
Keyword [en]
Neutrino oscillation, leptonic CP phase, long-baseline neutrino experiments, atmospheric neutrino experiments
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-184978DOI: 10.1007/s12043-015-1159-5ISI: 000370074000020ScopusID: 2-s2.0-84959288869OAI: diva2:917783

QC 20160407

Available from: 2016-04-07 Created: 2016-04-07 Last updated: 2016-04-07Bibliographically approved

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Raut, Sushant K.
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