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Summary of WG1 – Phenomenological issues

Explore the latest research findings on resolving degeneracies, improving energy resolution, and achieving precision measurements in neutrino physics. Discover important developments in predictive models, modified probabilities, and the significance of long baseline experiments.

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Summary of WG1 – Phenomenological issues

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  1. Summary of WG1 – Phenomenological issues Osamu Yasuda (TMU)

  2. Various proposals to resolve 8-fold degeneracy Schwetz ATM+LBL Nunokawa T2K-II ( ) +a detector in Korea Okamura T2K-I (n) +a detector in Korea Palomares-Ruiz two detectors for Nova Ota possibility to use polarized m Donini importance ofenergy resolution Meloni Precision measurements of q23 and Dm232

  3. Miscellaneous topics Blennow Phenomenology with the modified probability Winter Applications of very long baseline experiments Takamura Analytical treatment of 3-flavor oscillation probability Romanino Predictive models for q13 and mee

  4. Thomas Schwetz Atmospheric neutrinos aresensitive to mass hierarchy. Combining ATM and LBL  sign(Dm232) ambiguity is resolved. solid: LBL-only, dashed: ATM-only, shading: LBL+ATM

  5. Hiroshi Nunokawa

  6. Naotoshi Okamura KJ experiment • T2K phase I + Korea (1.OAB - 2.Detectors) • L=295km OA:3.0 and L=1000km OA:0.5 • with reactor experiment • we get them • mass hierarchy : 2> 9 (sin2213  0.06) • CP phase : 0180 (sin2213  0.06)

  7. Sergio Palomares-Ruiz • Super-NOA: 2 off-axis (LAr) detectors with same L/E using the NuMI beam → determination of sign( m231) free of degeneracies • Only need of 5 years of neutrino run to resolve the type of hierarchy down to sin2 213 = 0.02 with Proton Driver (for all values of ) • Better capabilities than NOA + T2K at HK for determining the type of mass hierarchy

  8. Toshihiko Ota Polarized m- with Pm =-1 (m+ with Pm =+1 ) gives exclusively nm（　　） in principle can be measured Theoretically seems to resolve degeneracy, but detailed studies are needed to draw definite conclusions.

  9. Andrea Donini • Precision measurements of q23 and Dm223 need energy resolution and events above and below the oscillation peak • SPL is clearly inadequate for the task. T2K-I is very good due to energy resolution and it can exclude maximal mixing for q23 <41º • The NuFactory seems extremely promising but more study is needed (a very long baseline?)

  10. Davide Meloni q13 Comparison between 2 and 3 dof`s analysis present uncertainties on atmospheric parameters arelarge enoughto modify in a significant way the results of 2-par fits If the atmospheric parameters will be measure with theexpectedprecisionafter T2K-I (Nona) the results of 2-par fits presented in the literature can be considered reliable

  11. Phenomenology with the modified probability Mattias Blennow Introduction of an extra parameter sEcan result in larger q13 Energy dependence may be useful to discover the new effect

  12. 10-1 10-2 10-3 10-4 10-5 10-6 Excluded sin22q13 Walter Winter VL baseline applications • Major challenge: Decay ring/decay tunnel slope • Open question: Simultaneous or subsequent operation of VL baseline? Feasibility study for storage ring configurations needed!

  13. Akira Takamura Analytical treatment of 3-flavor probability for non-constant density profile: basically expressed in terms of 2-flavor amplitudes Agreement with numerical results are good

  14. Andrea Romanino Predictive models

  15. ---Phenomenological issues---- Achievements@Nufact05 • Degeneracies can be resolved by one way or the other (super beams + n factories + beta beams + reactors) for sin22q13 >0.03. • New physics (other than oscillations) or applications of very long baseline experiments have been studied. Problems towards Nufact06 • Look for ways to resolve degeneracies for sin22q13 <<0.03. • Look for more interesting new physics or more applications of very long baseline experiments.

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