Evidence for leptonic CP phase from NOνA, T2K and ICAL
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- 作者：MONOJIT GHOSH ; POMITA GHOSHAL ; SRUBABATI GOSWAMI ; SUSHANT K RAUT
- 关键词：Neutrino oscillation ; leptonic CP phase ; long ; baseline neutrino experiments ; atmospheric neutrino experiments ; 14.60.Pg
- 刊名：Pramana
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：86
- 期：2
- 页码：387-393
- 全文大小：880 KB
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POMITA GHOSHAL (2)
SRUBABATI GOSWAMI (1)
SUSHANT K RAUT (3)
1. Physical Research Laboratory, Navrangpura, Ahmedabad, 380 009, India
2. Department of Physics, L.N.M. Institute of Information Technology, Rupa-ki-Nangal, post-Sumel, via-Jamdoli, Jaipur, 302 031, India
3. Department of Theoretical Physics, School of Engineering Sciences, KTH Royal Institute of Technology – AlbaNova University Center, Roslagstullsbacken 21, 106 91, Stockholm, Sweden - 刊物类别：Physics and Astronomy
- 刊物主题：Physics
Physics
Astronomy
Astrophysics - 出版者：Springer India
- ISSN：0973-7111
文摘
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 (ݜ㠼sub>12, ݜ㠼sub>23 and ݜ㠼sub>13) and one phase (δ CP) known as the leptonic CP phase. Neutrino oscillation also involves two mass squared differences: the solar mass square difference (\({\Delta }_{21} = {m_{2}^{2}} - {m_{1}^{2}}\)) and the atmospheric mass square difference (\({\Delta }_{31} = |{m_{3}^{2}} - {m_{1}^{2}}|\)). 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 ݜ㠼sub>23, i.e., lower (ݜ㠼sub>23<45∘: LO) or higher (ݜ㠼sub>23>45∘: HO). The long-baseline experiments (LBL) have CP sensitivity coming from the appearance channel (\(\nu _{\mu } \rightarrow \nu _{e}\)). On the other hand, atmospheric neutrinos are known to have negligible CP sensitivity. In this work, we study the synergy between the LBL experiment NOνA, 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 NOν A/T2K is poorer for some parameter ranges. Addition of ICAL data to T2K and NOνA can exclude these spurious wrong-hierarchy and /or wrong-octant solutions and cause a significant increase in the range of δ CP values for which a hint of CP violation can be achieved. Similarly, the precision with which δ CP can be measured also improves with the inclusion of ICAL data. Keywords Neutrino oscillation leptonic CP phase long-baseline neutrino experiments atmospheric neutrino experiments