Yayınlanmış 1 Ocak 2018 | Sürüm v1
Dergi makalesi Açık

Final Results of the OPERA Experiment on nu(tau )Appearance In the CNGS Neutrino Beam

Oluşturanlar

  • 1. Russian Acad Sci, Inst Nucl Res, RUS-117312 Moscow, Russia
  • 2. INFN, Sez Napoli, I-80126 Naples, Italy
  • 3. Lomonosov Moscow State Univ, SINP MSU Skobeltsyn Inst Nucl Phys, RUS-119991 Moscow, Russia
  • 4. Kobe Univ, J-6578501 Kobe, Hyogo, Japan
  • 5. Univ Bern, Lab High Energy Phys, Albert Einstein Ctr Fundamental Phys, CH-3012 Bern, Switzerland
  • 6. INFN, Sez Padova, I-35131 Padua, Italy
  • 7. Russian Acad Sci, LPI, RUS-119991 Moscow, Russia
  • 8. JINR, RUS-141980 Dubna, Russia
  • 9. INFN, Lab Nazl Gran Sasso, I-67010 Laquila, Italy
  • 10. Univ Savoie Mont Blanc, CNRS, IN2P3, LAPP, F-74941 Annecy Le Vieux, France
  • 11. INFN, Sez Bologna, I-40127 Bologna, Italy

Açıklama

The OPERA experiment was designed to study nu mu -> nu tau oscillations in the appearance mode in the CERN to Gran Sasso Neutrino beam (CNGS). In this Letter, we report the final analysis of the full data sample collected between 2008 and 2012, corresponding to 17.97 x 10(19) protons on target. Selection criteria looser than in previous analyses have produced ten nu(tau) candidate events, thus reducing the statistical uncertainty in the measurement of the oscillation parameters and of nu(tau) properties. A multivariate approach for event identification has been applied to the candidate events and the discovery of nu(tau) appearance is confirmed with an improved significance level of 6.1 sigma. |Delta m(32)(2)| has been measured, in appearance mode, with an accuracy of 20%. The measurement of the nu(tau) charged-current cross section, for the first ti me with a negligible contamination from p(z), and the first direct evidence for the nu(tau) lepton number are also reported.

Dosyalar

bib-47b2ce69-fba6-41a7-97f3-89d912f49bea.txt

Dosyalar (416 Bytes)

Ad Boyut Hepisini indir
md5:e1ecc1d99314fcc74797d22ffa2e8f54
416 Bytes Ön İzleme İndir