Probing CP violation with non-unitary mixing in long-baseline neutrino oscillation experiments: DUNE as a case study
When neutrino masses arise from the exchange of neutral heavy leptons, as in most seesaw schemes, the effective lepton mixing matrix N describing neutrino propagation is non-unitary, hence neutrinos are not exactly orthonormal. New CP violation phases appear in N that could be confused with the stan...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2017-01-01
|
| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/aa79ec |
| _version_ | 1797750552233246720 |
|---|---|
| author | F J Escrihuela D V Forero O G Miranda M Tórtola J W F Valle |
| author_facet | F J Escrihuela D V Forero O G Miranda M Tórtola J W F Valle |
| author_sort | F J Escrihuela |
| collection | DOAJ |
| description | When neutrino masses arise from the exchange of neutral heavy leptons, as in most seesaw schemes, the effective lepton mixing matrix N describing neutrino propagation is non-unitary, hence neutrinos are not exactly orthonormal. New CP violation phases appear in N that could be confused with the standard phase ${\delta }_{\mathrm{CP}}$ characterizing the three neutrino paradigm. We study the potential of the long-baseline neutrino experiment DUNE in probing CP violation induced by the standard CP phase in the presence of non-unitarity. In order to accomplish this we develop our previous formalism, so as to take into account the neutrino interactions with the medium, important in long baseline experiments such as DUNE. We find that the expected CP sensitivity of DUNE is somewhat degraded with respect to that characterizing the standard unitary case. However the effect is weaker than might have been expected thanks mainly to the wide neutrino beam. We also investigate the sensitivity of DUNE to the parameters characterizing non-unitarity. In this case we find that there is no improvement expected with respect to the current situation, unless the near detector setup is revamped. |
| first_indexed | 2024-03-12T16:35:26Z |
| format | Article |
| id | doaj.art-542fd0dee95847769245fccfad2563b1 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:35:26Z |
| publishDate | 2017-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-542fd0dee95847769245fccfad2563b12023-08-08T14:55:03ZengIOP PublishingNew Journal of Physics1367-26302017-01-0119909300510.1088/1367-2630/aa79ecProbing CP violation with non-unitary mixing in long-baseline neutrino oscillation experiments: DUNE as a case studyF J Escrihuela0D V Forero1https://orcid.org/0000-0003-4139-5670O G Miranda2M Tórtola3https://orcid.org/0000-0002-5855-2671J W F Valle4https://orcid.org/0000-0002-1881-5094AHEP Group, Institut de Física Corpuscular—C.S.I.C./Universitat de València , Parc Cientific de Paterna, C/Catedratico José Beltrán, 2 E-46980 Paterna (València), SpainCenter for Neutrino Physics, Virginia Tech, Blacksburg, VA 24061, United States of AmericaDepartamento de Física, Centro de Investigación y de Estudios Avanzados del IPN, Apdo. Postal 14-740 07000 Mexico, DF, MexicoAHEP Group, Institut de Física Corpuscular—C.S.I.C./Universitat de València , Parc Cientific de Paterna, C/Catedratico José Beltrán, 2 E-46980 Paterna (València), SpainAHEP Group, Institut de Física Corpuscular—C.S.I.C./Universitat de València , Parc Cientific de Paterna, C/Catedratico José Beltrán, 2 E-46980 Paterna (València), SpainWhen neutrino masses arise from the exchange of neutral heavy leptons, as in most seesaw schemes, the effective lepton mixing matrix N describing neutrino propagation is non-unitary, hence neutrinos are not exactly orthonormal. New CP violation phases appear in N that could be confused with the standard phase ${\delta }_{\mathrm{CP}}$ characterizing the three neutrino paradigm. We study the potential of the long-baseline neutrino experiment DUNE in probing CP violation induced by the standard CP phase in the presence of non-unitarity. In order to accomplish this we develop our previous formalism, so as to take into account the neutrino interactions with the medium, important in long baseline experiments such as DUNE. We find that the expected CP sensitivity of DUNE is somewhat degraded with respect to that characterizing the standard unitary case. However the effect is weaker than might have been expected thanks mainly to the wide neutrino beam. We also investigate the sensitivity of DUNE to the parameters characterizing non-unitarity. In this case we find that there is no improvement expected with respect to the current situation, unless the near detector setup is revamped.https://doi.org/10.1088/1367-2630/aa79ecneutrino masses and mixingsneutrino oscillationsneutrino interactions13.15.+g14.60.Pq14.60.St |
| spellingShingle | F J Escrihuela D V Forero O G Miranda M Tórtola J W F Valle Probing CP violation with non-unitary mixing in long-baseline neutrino oscillation experiments: DUNE as a case study New Journal of Physics neutrino masses and mixings neutrino oscillations neutrino interactions 13.15.+g 14.60.Pq 14.60.St |
| title | Probing CP violation with non-unitary mixing in long-baseline neutrino oscillation experiments: DUNE as a case study |
| title_full | Probing CP violation with non-unitary mixing in long-baseline neutrino oscillation experiments: DUNE as a case study |
| title_fullStr | Probing CP violation with non-unitary mixing in long-baseline neutrino oscillation experiments: DUNE as a case study |
| title_full_unstemmed | Probing CP violation with non-unitary mixing in long-baseline neutrino oscillation experiments: DUNE as a case study |
| title_short | Probing CP violation with non-unitary mixing in long-baseline neutrino oscillation experiments: DUNE as a case study |
| title_sort | probing cp violation with non unitary mixing in long baseline neutrino oscillation experiments dune as a case study |
| topic | neutrino masses and mixings neutrino oscillations neutrino interactions 13.15.+g 14.60.Pq 14.60.St |
| url | https://doi.org/10.1088/1367-2630/aa79ec |
| work_keys_str_mv | AT fjescrihuela probingcpviolationwithnonunitarymixinginlongbaselineneutrinooscillationexperimentsduneasacasestudy AT dvforero probingcpviolationwithnonunitarymixinginlongbaselineneutrinooscillationexperimentsduneasacasestudy AT ogmiranda probingcpviolationwithnonunitarymixinginlongbaselineneutrinooscillationexperimentsduneasacasestudy AT mtortola probingcpviolationwithnonunitarymixinginlongbaselineneutrinooscillationexperimentsduneasacasestudy AT jwfvalle probingcpviolationwithnonunitarymixinginlongbaselineneutrinooscillationexperimentsduneasacasestudy |