<p>Oscillations of atmospheric muon and electron neutrinos produce tau neutrinos with energies in the GeV range, which can be observed by the ORCA detector of the KM3NeT neutrino telescope in the Mediterranean Sea. First measurements with ORCA6, an early subarray corresponding to about 5% of the final detector, are presented. A sample of 5828 neutrino candidates has been selected from the analysed exposure of 433 kton-years. The <i>ν</i><sub><i>τ</i></sub> normalisation, defined as the ratio between the number of observed and expected tau neutrino events, is measured to be <InlineEquation ID="IEq1"> <EquationSource Format="MATHML"><math display="inline"> <msub> <mi>S</mi> <mi>τ</mi> </msub> <mo>=</mo> <msubsup> <mn>0.48</mn> <mrow> <mo>−</mo> <mn>0.33</mn> </mrow> <mrow> <mo>+</mo> <mn>0.5</mn> </mrow> </msubsup> </math></EquationSource> <EquationSource Format="TEX">\( {S}_{\tau }={0.48}_{-0.33}^{+0.5} \)</EquationSource> </InlineEquation>. This translates into a <i>ν</i><sub><i>τ</i></sub> charged-current cross section measurement of <InlineEquation ID="IEq2"> <EquationSource Format="MATHML"><math display="inline"> <msubsup> <mi>σ</mi> <mi>τ</mi> <mtext>meas</mtext> </msubsup> <mo>=</mo> <mfenced close=")" open="("> <msubsup> <mn>2.5</mn> <mrow> <mo>−</mo> <mn>1.8</mn> </mrow> <mrow> <mo>+</mo> <mn>2.6</mn> </mrow> </msubsup> </mfenced> <mo>×</mo> <msup> <mn>10</mn> <mrow> <mo>−</mo> <mn>38</mn> </mrow> </msup> </math></EquationSource> <EquationSource Format="TEX">\( {\sigma}_{\tau}^{\textrm{meas}}=\left({2.5}_{-1.8}^{+2.6}\right)\times {10}^{-38} \)</EquationSource> </InlineEquation> cm<sup>2</sup> nucleon<sup><i>−</i>1</sup> at the median <i>ν</i><sub><i>τ</i></sub> energy of 20.3 GeV. The result is consistent with the measurements of other experiments. In addition, the current limit on the non-unitarity parameter affecting the <i>τ</i>-row of the neutrino mixing matrix was improved, with <i>α</i><sub>33</sub> <i>&gt;</i> 0.95 at the 95% confidence level.</p>

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Study of tau neutrinos and non-unitary neutrino mixing with the first six detection units of KM3NeT/ORCA

  • S. Aiello,
  • A. Albert,
  • A. R. Alhebsi,
  • M. Alshamsi,
  • S. Alves Garre,
  • A. Ambrosone,
  • F. Ameli,
  • M. Andre,
  • L. Aphecetche,
  • M. Ardid,
  • S. Ardid,
  • J. Aublin,
  • F. Badaracco,
  • L. Bailly-Salins,
  • Z. Bardačová,
  • B. Baret,
  • A. Bariego-Quintana,
  • Y. Becherini,
  • M. Bendahman,
  • F. Benfenati Gualandi,
  • M. Benhassi,
  • M. Bennani,
  • D. M. Benoit,
  • E. Berbee,
  • V. Bertin,
  • S. Biagi,
  • M. Boettcher,
  • D. Bonanno,
  • A. B. Bouasla,
  • J. Boumaaza,
  • M. Bouta,
  • M. Bouwhuis,
  • C. Bozza,
  • R. M. Bozza,
  • H. Brânzaş,
  • F. Bretaudeau,
  • M. Breuhaus,
  • R. Bruijn,
  • J. Brunner,
  • R. Bruno,
  • E. Buis,
  • R. Buompane,
  • J. Busto,
  • B. Caiffi,
  • D. Calvo,
  • A. Capone,
  • F. Carenini,
  • V. Carretero,
  • T. Cartraud,
  • P. Castaldi,
  • V. Cecchini,
  • S. Celli,
  • L. Cerisy,
  • M. Chabab,
  • A. Chen,
  • S. Cherubini,
  • T. Chiarusi,
  • M. Circella,
  • R. Clark,
  • R. Cocimano,
  • J. A. B. Coelho,
  • A. Coleiro,
  • A. Condorelli,
  • R. Coniglione,
  • P. Coyle,
  • A. Creusot,
  • G. Cuttone,
  • R. Dallier,
  • A. De Benedittis,
  • G. De Wasseige,
  • V. Decoene,
  • P. Deguire,
  • I. Del Rosso,
  • L. S. Di Mauro,
  • I. Di Palma,
  • A. F. Díaz,
  • D. Diego-Tortosa,
  • C. Distefano,
  • A. Domi,
  • C. Donzaud,
  • D. Dornic,
  • E. Drakopoulou,
  • D. Drouhin,
  • J.-G. Ducoin,
  • P. Duverne,
  • R. Dvornický,
  • T. Eberl,
  • E. Eckerová,
  • A. Eddymaoui,
  • T. van Eeden,
  • M. Eff,
  • D. van Eijk,
  • I. El Bojaddaini,
  • S. El Hedri,
  • S. El Mentawi,
  • V. Ellajosyula,
  • A. Enzenhöfer,
  • G. Ferrara,
  • M. D. Filipović,
  • F. Filippini,
  • D. Franciotti,
  • L. A. Fusco,
  • S. Gagliardini,
  • T. Gal,
  • J. García Méndez,
  • A. Garcia Soto,
  • C. Gatius Oliver,
  • N. Geißelbrecht,
  • E. Genton,
  • H. Ghaddari,
  • L. Gialanella,
  • B. K. Gibson,
  • E. Giorgio,
  • I. Goos,
  • P. Goswami,
  • S. R. Gozzini,
  • R. Gracia,
  • C. Guidi,
  • B. Guillon,
  • M. Gutiérrez,
  • C. Haack,
  • H. van Haren,
  • A. Heijboer,
  • L. Hennig,
  • J. J. Hernández-Rey,
  • A. Idrissi,
  • W. Idrissi Ibnsalih,
  • G. Illuminati,
  • D. Joly,
  • M. de Jong,
  • P. de Jong,
  • B. J. Jung,
  • P. Kalaczyński,
  • V. Kikvadze,
  • G. Kistauri,
  • C. Kopper,
  • A. Kouchner,
  • Y. Y. Kovalev,
  • L. Krupa,
  • V. Kueviakoe,
  • V. Kulikovskiy,
  • R. Kvatadze,
  • M. Labalme,
  • R. Lahmann,
  • M. Lamoureux,
  • G. Larosa,
  • C. Lastoria,
  • J. Lazar,
  • A. Lazo,
  • S. Le Stum,
  • G. Lehaut,
  • V. Lemaître,
  • E. Leonora,
  • N. Lessing,
  • G. Levi,
  • M. Lindsey Clark,
  • F. Longhitano,
  • F. Magnani,
  • J. Majumdar,
  • L. Malerba,
  • F. Mamedov,
  • A. Manfreda,
  • A. Manousakis,
  • M. Marconi,
  • A. Margiotta,
  • A. Marinelli,
  • C. Markou,
  • L. Martin,
  • M. Mastrodicasa,
  • S. Mastroianni,
  • J. Mauro,
  • K. C. K. Mehta,
  • A. Meskar,
  • G. Miele,
  • P. Migliozzi,
  • E. Migneco,
  • M. L. Mitsou,
  • C. M. Mollo,
  • L. Morales-Gallegos,
  • A. Moussa,
  • I. Mozun Mateo,
  • R. Muller,
  • M. R. Musone,
  • M. Musumeci,
  • S. Navas,
  • A. Nayerhoda,
  • C. A. Nicolau,
  • B. Nkosi,
  • B. Ó Fearraigh,
  • V. Oliviero,
  • A. Orlando,
  • E. Oukacha,
  • D. Paesani,
  • J. Palacios González,
  • G. Papalashvili,
  • V. Parisi,
  • A. Parmar,
  • E. J. Pastor Gomez,
  • C. Pastore,
  • A. M. Păun,
  • G. E. Păvălaş,
  • S. Peña Martínez,
  • M. Perrin-Terrin,
  • V. Pestel,
  • R. Pestes,
  • P. Piattelli,
  • A. Plavin,
  • C. Poirè,
  • V. Popa,
  • T. Pradier,
  • J. Prado,
  • S. Pulvirenti,
  • C. A. Quiroz-Rangel,
  • N. Randazzo,
  • A. Ratnani,
  • S. Razzaque,
  • I. C. Rea,
  • D. Real,
  • G. Riccobene,
  • A. Romanov,
  • E. Ros,
  • A. Šaina,
  • F. Salesa Greus,
  • D. F. E. Samtleben,
  • A. Sánchez Losa,
  • S. Sanfilippo,
  • M. Sanguineti,
  • D. Santonocito,
  • P. Sapienza,
  • M. Scarnera,
  • J. Schnabel,
  • J. Schumann,
  • H. M. Schutte,
  • J. Seneca,
  • N. Sennan,
  • P. Sevle,
  • I. Sgura,
  • R. Shanidze,
  • A. Sharma,
  • Y. Shitov,
  • F. Šimkovic,
  • A. Simonelli,
  • A. Sinopoulou,
  • B. Spisso,
  • M. Spurio,
  • D. Stavropoulos,
  • I. Štekl,
  • M. Taiuti,
  • G. Takadze,
  • Y. Tayalati,
  • H. Thiersen,
  • S. Thoudam,
  • I. Tosta e Melo,
  • B. Trocmé,
  • V. Tsourapis,
  • A. Tudorache,
  • E. Tzamariudaki,
  • A. Ukleja,
  • A. Vacheret,
  • V. Valsecchi,
  • V. Van Elewyck,
  • G. Vannoye,
  • G. Vasileiadis,
  • F. Vazquez de Sola,
  • A. Veutro,
  • S. Viola,
  • D. Vivolo,
  • A. van Vliet,
  • E. de Wolf,
  • I. Lhenry-Yvon,
  • S. Zavatarelli,
  • A. Zegarelli,
  • D. Zito,
  • J. D. Zornoza,
  • J. Zúñiga,
  • N. Zywucka

摘要

Oscillations of atmospheric muon and electron neutrinos produce tau neutrinos with energies in the GeV range, which can be observed by the ORCA detector of the KM3NeT neutrino telescope in the Mediterranean Sea. First measurements with ORCA6, an early subarray corresponding to about 5% of the final detector, are presented. A sample of 5828 neutrino candidates has been selected from the analysed exposure of 433 kton-years. The ντ normalisation, defined as the ratio between the number of observed and expected tau neutrino events, is measured to be S τ = 0.48 0.33 + 0.5 \( {S}_{\tau }={0.48}_{-0.33}^{+0.5} \) . This translates into a ντ charged-current cross section measurement of σ τ meas = 2.5 1.8 + 2.6 × 10 38 \( {\sigma}_{\tau}^{\textrm{meas}}=\left({2.5}_{-1.8}^{+2.6}\right)\times {10}^{-38} \) cm2 nucleon1 at the median ντ energy of 20.3 GeV. The result is consistent with the measurements of other experiments. In addition, the current limit on the non-unitarity parameter affecting the τ-row of the neutrino mixing matrix was improved, with α33 > 0.95 at the 95% confidence level.