Absence of a day-night asymmetry in the 7Be solar neutrino rate in Borexino

G. Bellini, J. Benziger, D. Bick, S. Bonetti, G. Bonfini, M. Buizza Avanzini, B. Caccianiga, L. Cadonati, F. Calaprice, C. Carraro, P. Cavalcante, A. Chavarria, D. D'Angelo, S. Davini, A. Derbin, A. Etenko, F. von Feilitzsch, K. Fomenko, D. Franco, C. GalbiatiS. Gazzana, C. Ghiano, M. Giammarchi, M. Göger-Neff, A. Goretti, L. Grandi, E. Guardincerri, S. Hardy, Aldo Ianni, Andrea Ianni, V. Kobychev, D. Korablev, G. Korga, Y. Koshio, D. Kryn, M. Laubenstein, T. Lewke, E. Litvinovich, B. Loer, P. Lombardi, F. Lombardi, L. Ludhova, I. Machulin, S. Manecki, W. Maneschg, G. Manuzio, Q. Meindl, E. Meroni, L. Miramonti, M. Misiaszek, D. Montanari, P. Mosteiro, V. Muratova, L. Oberauer, M. Obolensky, F. Ortica, M. Pallavicini, L. Papp, C. Peña-Garay, L. Perasso, S. Perasso, A. Pocar, R. S. Raghavan, G. Ranucci, A. Razeto, A. Re, A. Romani, A. Sabelnikov, R. Saldanha, C. Salvo, S. Schönert, H. Simgen, M. Skorokhvatov, O. Smirnov, A. Sotnikov, S. Sukhotin, Y. Suvorov, R. Tartaglia, G. Testera, D. Vignaud, R. B. Vogelaar, J. Winter, M. Wojcik, A. Wright, M. Wurm, J. Xu, O. Zaimidoroga, S. Zavatarelli, G. Zuzel

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Abstract

We report the result of a search for a day-night asymmetry in the 7Be solar neutrino interaction rate in the Borexino detector at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy. The measured asymmetry is A dn=0.001±0.012 (stat)±0.007 (syst), in agreement with the prediction of MSW-LMA solution for neutrino oscillations. This result disfavors MSW oscillations with mixing parameters in the LOW region at more than 8.5 Σ. This region is, for the first time, strongly disfavored without the use of reactor anti-neutrino data and therefore the assumption of CPT symmetry. The result can also be used to constrain some neutrino oscillation scenarios involving new physics.

Original languageEnglish (US)
Pages (from-to)22-26
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume707
Issue number1
DOIs
StatePublished - Jan 16 2012

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Keywords

  • CPT violation
  • Day-night effect
  • Neutrino oscillations
  • Solar neutrinos

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    Bellini, G., Benziger, J., Bick, D., Bonetti, S., Bonfini, G., Buizza Avanzini, M., Caccianiga, B., Cadonati, L., Calaprice, F., Carraro, C., Cavalcante, P., Chavarria, A., D'Angelo, D., Davini, S., Derbin, A., Etenko, A., von Feilitzsch, F., Fomenko, K., Franco, D., ... Zuzel, G. (2012). Absence of a day-night asymmetry in the 7Be solar neutrino rate in Borexino. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 707(1), 22-26. https://doi.org/10.1016/j.physletb.2011.11.025