Solar model parameters and direct measurements of solar neutrino fluxes

Bandyopadhyay, Abhijit; Choubey, Sandhya; Goswami, Srubabati; Petcov, S.T.

doi:10.1103/physrevd.75.093007

“…They would introduce (mostly energy averaged) effects, which could be visible as disappearance signals in the near detectors of these experiments. This has been discussed in [38] for the Double-Chooz experiment, but also the near detectors at superbeam experiments should be explored.…”

Section: Lsnd and Miniboone Resultsmentioning

confidence: 99%

Neutrino oscillations: Present status and outlook

Schwetz

¹

2009

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Abstract. I summarize the status of three-flavour neutrino oscillations with date of Oct. 2007, and provide an outlook for the developments to be expected in the near future. Furthermore, I discuss the status of sterile neutrino oscillation interpretations of the LSND anomaly in the light of recent MiniBooNE results, and comment on implications for the future neutrino oscillation program.Keywords: Neutrino oscillations PACS: 14.60. Lm, 14.60.Pq, 14.60.St Thanks to the spectacular developments in neutrino oscillation experiments in the last years we have now a rough picture of the parameters governing three-flavour oscillations (see also Ref.[1] for an overview): There are two mass-squared differences separated roughly by a factor 30, there are two large mixing angles (θ 23 , which could even be 45 • , and θ 12 , which is large but smaller than 45 • at very high significance), and one mixing angle which has to be small (θ 13 ). Present data is consistent with two possibilities for the neutrino mass ordering, conventionally parametrized by the sign of ∆m 2 31 : In the normal ordering (∆m 2 31 > 0) the mass state which contains predominantly the electron neutrino has the smallest mass, whereas in the inverted ordering (∆m 2 31 < 0) it is part of a nearly degenerate doublet of mass states which is separated from the lightest neutrino mass by |∆m 2 31 |.

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“…They would introduce (mostly energy averaged) effects, which could be visible as disappearance signals in the near detectors of these experiments. This has been discussed in [38] for the Double-Chooz experiment, but also the near detectors at superbeam experiments should be explored. 4 However, for the subsequent generation of oscillation experiments aiming at sub-percent level precision to test CP violation and the neutrino mass hierarchy, the ques- 3 In Ref.…”

Section: Lsnd and Miniboone Resultsmentioning

confidence: 99%

Neutrino oscillations: present status and outlook

Schwetz

¹

2008

AIP Conference Proceedings

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Abstract. I summarize the status of three-flavour neutrino oscillations with date of Oct. 2007, and provide an outlook for the developments to be expected in the near future. Furthermore, I discuss the status of sterile neutrino oscillation interpretations of the LSND anomaly in the light of recent MiniBooNE results, and comment on implications for the future neutrino oscillation program.Keywords: Neutrino oscillations PACS: 14.60. Lm, 14.60.Pq, 14.60.St Thanks to the spectacular developments in neutrino oscillation experiments in the last years we have now a rough picture of the parameters governing three-flavour oscillations (see also Ref.[1] for an overview): There are two mass-squared differences separated roughly by a factor 30, there are two large mixing angles (θ 23 , which could even be 45 • , and θ 12 , which is large but smaller than 45 • at very high significance), and one mixing angle which has to be small (θ 13 ). Present data is consistent with two possibilities for the neutrino mass ordering, conventionally parametrized by the sign of ∆m 2 31 : In the normal ordering (∆m 2 31 > 0) the mass state which contains predominantly the electron neutrino has the smallest mass, whereas in the inverted ordering (∆m 2 31 < 0) it is part of a nearly degenerate doublet of mass states which is separated from the lightest neutrino mass by |∆m 2 31 |.

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“…Here we have given the best-fit values as well as the 1σ and 3σ ranges (see also [6][7][8]). Obviously, even if Nature has chosen TBM 1 as the lepton mixing scheme, one expects deviations from it on very general grounds.…”

Section: Introductionmentioning

confidence: 99%

Large|Ue3|and tribimaximal mixing

Goswami

¹

,

Petcov

²

,

Ray

³

et al. 2009

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We investigate in a model-independent way to what extent one can perturb tri-bimaximal mixing in order to generate a sizable value of |U e3 |, while at the same time keeping solar neutrino mixing near its measured value, which is close to sin 2 θ 12 = 1 3 . Three straightforward breaking mechanisms to generate |U e3 | ≃ 0.1 are considered. For charged lepton corrections, the suppression of a sizable contribution to sin 2 θ 12 can be achieved if CP violation in neutrino oscillations is almost maximal. Generation of the indicated value of |U e3 | ≃ 0.1 through renormalization group corrections requires the neutrinos to be quasi-degenerate in mass. The consistency with the allowed range of sin 2 θ 12 together with large running of |U e3 | forces one of the Majorana phases to be close to π. This implies large cancellations in the effective Majorana mass governing neutrino-less double beta ((ββ) 0ν -)decay, constraining it to lie near its minimum allowed value of m 0 cos 2θ 12 , where m 0 > ∼ 0.1 eV. Finally, explicit breaking of the neutrino mass matrix in the inverted hierarchical and quasi-degenerate neutrino mass spectrum cases is similarly correlated with the (ββ) 0ν -decay effective Majorana mass, although to a lesser extent. The implied values for the atmospheric neutrino mixing angle θ 23 are given in all cases.

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Solar model parameters and direct measurements of solar neutrino fluxes

Cited by 36 publications

References 57 publications

Neutrino oscillations: Present status and outlook

Neutrino oscillations: Present status and outlook

Neutrino oscillations: present status and outlook

Large|Ue3|and tribimaximal mixing

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