Abstract
The large value of θ 13 recently measured by rector and accelerator experiments opens unprecedented opportunities for precision oscillation physics. In this paper, we reconsider the physics reach of medium baseline superbeams. For θ 13≃9∘ we show that facilities at medium baselines—i.e. \(L \simeq \mathcal{O}\) (1000 km)—remain optimal for the study of CP violation in the leptonic sector, although their ultimate precision strongly depends on experimental systematics. This is demonstrated in particular for facilities of practical interest in Europe: a CERN to Gran Sasso and CERN to Phyäsalmi ν μ beam based on the present SPS and on new high power 50 GeV proton driver. Due to the large value of θ 13, spectral information can be employed at medium baselines to resolve the sign ambiguity and determine the neutrino mass hierarchy. However, longer baselines, where matter effects dominate the ν μ →ν e transition, can achieve much stronger sensitivity to \(\operatorname{sign}(\Delta m^{2})\) even at moderate exposures.
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References
Y. Itow et al. (The T2K Collaboration), The JHF-Kamioka neutrino project, arXiv:hep-ex/0106019
F. Ardellier et al. (Double Chooz Collaboration), Double Chooz: a search for the neutrino mixing angle theta(13), arXiv:hep-ex/0606025
X. Guo et al. (Daya-Bay Collaboration), A precision measurement of the neutrino mixing angle theta(13) using reactor antineutrinos at Daya Bay, arXiv:hep-ex/0701029
S.B. Kim (RENO Collaboration), RENO: reactor experiment for neutrino oscillation at Yonggwang. AIP Conf. Proc. 981, 205 (2008)
S.B. Kim (RENO Collaboration), RENO: reactor experiment for neutrino oscillation at Yonggwang. J. Phys. Conf. Ser. 120, 052025 (2008)
F.P. An et al. (DAYA-BAY Collaboration), Phys. Rev. Lett. 108, 171803 (2012)
J.K. Ahn et al. (RENO Collaboration), Phys. Rev. Lett. 108, 191802 (2012)
M. Ishitsuka, for the Double Chooz Collaboration. Talk at Neutrino 2012, Kyoto, 6–9 June 2012. Available at http://neu2012.kek.jp
K. Abe et al. (T2K Collaboration), Phys. Rev. Lett. 107, 041801 (2011)
K. Sakashita, for the T2K Collaboration. Talk at ICHEP 2012, Melbourne, 4–11 July 2012. Available at www.ichep2012.com.au
M. Apollonio et al. (CHOOZ Collaboration), Eur. Phys. J. C 27, 331 (2003)
F. Boehm et al., Phys. Rev. D 64, 112001 (2001)
G. Altarelli, F. Feruglio, New J. Phys. 6, 106 (2004)
M. Mezzetto, T. Schwetz, J. Phys. G 37, 103001 (2010)
A. Bandyopadhyay et al. (ISS Physics Working Group Collaboration), Rep. Prog. Phys. 72, 106201 (2009)
R. Battiston, M. Mezzetto, P. Migliozzi, F. Terranova, Riv. Nuovo Cimento 033, 313 (2010)
G.L. Fogli, E. Lisi, A. Marrone, D. Montanino, A. Palazzo, A.M. Rotunno, Phys. Rev. D 86, 013012 (2012)
P. Huber, M. Lindner, M. Rolinec, T. Schwetz, W. Winter, Phys. Rev. D 70, 073014 (2004)
V. Barger, P. Huber, D. Marfatia, W. Winter, Phys. Rev. D 76, 053005 (2007)
P. Huber, M. Lindner, T. Schwetz, W. Winter, J. High Energy Phys. 0911, 044 (2009)
P. Coloma, E. Fernandez-Martinez, J. High Energy Phys. 1204, 089 (2012)
P. Coloma, A. Donini, E. Fernandez-Martinez, P. Hernandez, J. High Energy Phys. 1206, 073 (2012)
P. Coloma, E. Fernandez-Martinez, L. Labarga, J. High Energy Phys. 1211, 069 (2012)
V. Barger, M. Dierckxsens, M. Diwan, P. Huber, C. Lewis, D. Marfatia, B. Viren, Phys. Rev. D 74, 073004 (2006)
T. Akiri et al. (LBNE Collaboration), The 2010 Interim Report of the Long-Baseline Neutrino Experiment Collaboration Physics Working Groups, arXiv:1110.6249 [hep-ex]
B. Baibussinov, M. Baldo Ceolin, G. Battistoni, P. Benetti, A. Borio, E. Calligarich, M. Cambiaghi, F. Cavanna et al., Astropart. Phys. 29, 174 (2008)
D. Autiero, J. Aysto, A. Badertscher, L.B. Bezrukov, J. Bouchez, A. Bueno, J. Busto, J.-E. Campagne et al., J. Cosmol. Astropart. Phys. 0711, 011 (2007)
A. Rubbia, J. Phys. Conf. Ser. 171, 012020 (2009)
D. Angus et al. (LAGUNA Collaboration), The LAGUNA design study—towards giant liquid based underground detectors for neutrino physics and astrophysics and proton decay searches, arXiv:1001.0077 [physics.ins-det]
A. Rubbia (LAGUNA Collaboration), Acta Phys. Pol. B 41, 1727 (2010)
S.K. Agarwalla, T. Li, A. Rubbia, J. High Energy Phys. 1205, 154 (2012)
A. Rubbia, Talk at Neutrino 2012, Kyoto, 6–9 June 2012. Available at http://neu2012.kek.jp
M. Freund, Phys. Rev. D 64, 053003 (2001)
K. Asano, H. Minakata, J. High Energy Phys. 1106, 022 (2011)
L. Votano, Talk at νTURN2012, LNGS, 8–10 May 2012. Available at http://nuturn2012.lngs.infn.it/
S. Amerio et al. (ICARUS Collaboration), Nucl. Instrum. Methods A 527, 329 (2004)
C. Rubbia, M. Antonello, P. Aprili, B. Baibussinov, M.B. Ceolin, L. Barze, P. Benetti, E. Calligarich et al., J. Instrum. 6, P07011 (2011)
F. Arneodo et al. (ICARUS Collaboration), The ICARUS experiment: a second generation proton decay experiment and neutrino observatory at the Gran Sasso Laboratory, arXiv:hep-ex/0103008
P. Aprili et al., The ICARUS experiment: a second-generation proton decay experiment and neutrino observatory at the Gran Sasso laboratory. Cloning of T600 modules to reach the design sensitive mass. CERN-SPSC-2002-027
C. Rubbia, Talk at νTURN2012, LNGS, 8–10 May 2012. Available at http://nuturn2012.lngs.infn.it/
A. Longhin, Optimization of neutrino beams for underground sites in Europe, arXiv:1206.4294v1
S. Agostinelli et al. (GEANT4 Collaboration), Nucl. Instrum. Methods A 506, 250 (2003)
J. Allison et al. (GEANT4 Collaboration), IEEE Trans. Nucl. Sci. 53, 270 (2006)
P. Huber, M. Lindner, W. Winter, Comput. Phys. Commun. 167, 195 (2005)
P. Huber, J. Kopp, M. Lindner, M. Rolinec, W. Winter, Comput. Phys. Commun. 177, 432 (2007)
M. Bonesini, A. Marchionni, F. Pietropaolo, T. Tabarelli de Fatis, Eur. Phys. J. C 20, 13 (2001)
A. Meregaglia, A. Rubbia, J. High Energy Phys. 0611, 032 (2006)
A. Ankowski et al. (ICARUS Collaboration), Acta Phys. Pol. B 41, 103 (2010)
C. Andreopoulos, A. Bell, D. Bhattacharya, F. Cavanna, J. Dobson, S. Dytman, H. Gallagher, P. Guzowski et al., Nucl. Instrum. Methods A 614, 87 (2010)
P. Huber, M. Lindner, W. Winter, Nucl. Phys. B 645, 3 (2002)
H. Minakata, H. Nunokawa, J. High Energy Phys. 0110, 001 (2001)
V. Barger, D. Marfatia, K. Whisnant, Phys. Rev. D 65, 073023 (2002)
P. Huber, M. Mezzetto, T. Schwetz, J. High Energy Phys. 0803, 021 (2008)
P. Coloma, P. Huber, J. Kopp, W. Winter, Systematic uncertainties in long-baseline neutrino oscillations for large θ 13, arXiv:1209.5973 [hep-ph]
P. Coloma, T. Li, S. Pascoli, A comparative study of long-baseline superbeams within LAGUNA for large θ 13, arXiv:1206.4038 [hep-ph]
D.S. Ayres et al. (NOvA Collaboration), NOvA proposal to build a 30-kiloton off-axis detector to study neutrino oscillations in the Fermilab NuMI beamline, arXiv:hep-ex/0503053
D.S. Ayres et al. The NOνA Technical Design Report, FERMILAB-DESIGN-2007-01 (2007)
Acknowledgements
We wish to express our gratitude to P. Coloma, E. Fernandez Martinez, F. Ferroni, A. Masiero, A. Meregaglia, A. Rubbia, C. Rubbia, and L. Votano for useful information and suggestions.
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Dusini, S., Longhin, A., Mezzetto, M. et al. CP violation and mass hierarchy at medium baselines in the large θ 13 era. Eur. Phys. J. C 73, 2392 (2013). https://doi.org/10.1140/epjc/s10052-013-2392-z
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DOI: https://doi.org/10.1140/epjc/s10052-013-2392-z