Atmospheric neutrino oscillation analysis with improved event reconstruction in Super-Kamiokande IV

Jiang, M.; Abe, K.; Bronner, C.; Hayato, Y.; Ikeda, M.; Iyogi, K.; Kameda, J.; Kato, Yuta; Kishimoto, Y.; Marti, Ll.; Miura, M.; Moriyama, S.; Mochizuki, T.; Nakahata, M.; Nakajima, Yasuhiro; Nakano, Y.; Nakayama, S.; Okada, Taku; Okamoto, Ken‐ichi; Orii, A.; Pronost, G.; Sekiya, H.; Shiozawa, M.; Sonoda, Y.; Takeda, Atsushi; Takenaka, A.; Tanaka, Hidekazu; Yano, T.; Akutsu, R.; Kajita, T.; Nishimura, Y.; Okumura, K.; Wang, R; Xia, J.; Labarga, L.; Fernández, P.; Blaszczyk, F. d. M.; Kachulis, C.; Kearns, E.; Raaf, J. L.; Stone, J. L.; Sussman, S.; Berkman, S.; Bian, J. M.; Griskevich, N. J.; Kropp, W. R.; Locke, S.; Mine, S.; Weatherly, P.; Smy, M. B.; Sobel, H. W.; Takhistov, Volodymyr; Ganezer, K. S.; Hill, J.; Kim, J Y; Lim, I. T.; Park, R G; Bodur, B.; Scholberg, K.; Walter, C. W.; Gonin, M.; Imber, J.; Mueller, T.; Ishizuka, T.; Nakamura, T.; Jang, J. S.; Choi, K.; Learned, J. G.; Matsuno, S.; Litchfield, R. P.; Uchida, Y.; Wascko, M. O.; Calabria, N. F.; Catanesi, M. G.; Intonti, R. A.; Radicioni, E.; Rosa, G. De; Ali, Ahmed Farag; Collazuol, G.; Iacob, F.; Ludovici, L.; Cao, S.; Friend, M.; Hasegawa, T.; Ishida, Toru; Kobayashi, T.; Nakadaira, T.; Nakamura, Kenzo; Oyama, Y.; Sakashita, K.; Sekiguchi, T.; Tsukamoto, T.; Hasegawa, M.; Isobe, Yuki; Miyabe, H.; Sugimoto, Takashi; Suzuki, A.; Takeuchi, Y.; Ashida, Yosuke; Hayashino, T.; Hirota, S.; Kikawa, T.; Mori, M.; Nakamura, K.; Nakaya, T.; Wendell, R.; Anthony, L. H. V.; McCauley, N.; Pritchard, A.; Tsui, K. M.; Fukuda, Y.; Itow, Y.; Murrase, M.; Mijakowski, P.; Frankiewicz, K.; Jung, C. K.; Li, X; Palomino, J. L.; Santucci, G.; Vilela, C.; Wilking, M. J.; Yanagisawa, C.; Fukuda, Daisuke; Hagiwara, Kaoru; Ishino, H.; Ito, S.; Koshio, Y.; Sakuda, M.; Takahira, Y.; Xu, Chenyuan; Kuno, Y.; Simpson, C.; Wark, D.; Lodovico, F. Di; Richards, B.; Sedgwick, S. Molina; Tacik, R.; Kim, S B; Thiesse, M.; Thompson, L. F.; Okazawa, H.; Choi, Y.; Nishijima, K.; Koshiba, M.; Yokoyama, M.; Goldsack, A.; Martens, K.; Murdoch, M.; Quilain, B.; Suzuki, Y.; Vagins, M.; Kuze, M.; Okajima, Y.; Yoshida, Tadashi; Ishitsuka, M.; Martin, J. F.; Nantais, C.; Tanaka, Hirohisa; Towstego, T.; Hartz, M.; Konaka, A.; Perio, P. de; Chen, S; Wan, L.; Minamino, A.

doi:10.1093/ptep/ptz015

Cited by 74 publications

(60 citation statements)

References 31 publications

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“…The neutrino mass ordering is very important to interpret the number of events which PTOLEMY can observe, as we will discuss in the next section. At present, the strongest preference for one of the two possible orderings by a single experiment comes from Super-Kamiokande, which favors normal ordering at ∼ 1.4σ [41]. Results from long-baseline oscillation experiments such as NOνA [42] or T2K [43], instead, provide a preference for normal ordering around the 2σ level (each) only when a prior on θ 13 from reactor experiments is adopted.…”

Section: Theoretical Contextmentioning

confidence: 94%

Neutrino physics with the PTOLEMY project: active neutrino properties and the light sterile case

Betti

Biasotti

Boscá

et al. 2019

J. Cosmol. Astropart. Phys.

163

177

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The PTOLEMY project aims to develop a scalable design for a Cosmic Neutrino Background (CNB) detector, the first of its kind and the only one conceived that can look directly at the image of the Universe encoded in neutrino background produced in the first second after the Big Bang. The scope of the work for the next three years is to complete the conceptual design of this detector and to validate with direct measurements that the nonneutrino backgrounds are below the expected cosmological signal. In this paper we discuss in details the theoretical aspects of the experiment and its physics goals. In particular, we mainly address three issues. First we discuss the sensitivity of PTOLEMY to the standard neutrino mass scale. We then study the perspectives of the experiment to detect the CNB via neutrino capture on tritium as a function of the neutrino mass scale and the energy resolution of the apparatus. Finally, we consider an extra sterile neutrino with mass in the eV range, coupled to the active states via oscillations, which has been advocated in view of neutrino oscillation anomalies. This extra state would contribute to the tritium decay spectrum, and its properties, mass and mixing angle, could be studied by analyzing the features in the beta decay electron spectrum.

show abstract

Section: Theoretical Contextmentioning

confidence: 94%

Neutrino physics with the PTOLEMY project: active neutrino properties and the light sterile case

Betti

Biasotti

Boscá

et al. 2019

J. Cosmol. Astropart. Phys.

163

177

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show abstract

“…Therefore, it is fair to say that it is ∼ 10. 13 The contrast of the sizes of CP phase dependence between the solar-scale oscillation enhanced region and the conventional LBL setting, NOνA as just an example, can be best represented by the bi-probability plot in P (ν µ → ν e ) − P (ν µ →ν e ) space [20], as seen in figure 1. In this example the ellipses in the solar-scale enhanced region are about 10 times larger than NOνA's.…”

Section: Cp Violation Around the Solar Resonancementioning

confidence: 99%

“…The matter potential shifts the CP ellipse to right-down (left-up) direction in the normal (inverted) mass ordering, but keeping its size almost as it is for relatively short baseline L ∼ 1000 km. 13 Another example of amplification of the δ dependent terms is the one at the second oscillation maximum [58,59]. One may regard this amplification of a factor of ∼3 is due to "imperfect growth" of the solar-scale oscillation.…”

Section: Cp Violation Around the Solar Resonancementioning

confidence: 99%

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Perturbing neutrino oscillations around the solar resonance

Martinez-Soler

Minakata

2019

Progress of Theoretical and Experimental Physics

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Atmospheric neutrinos at low energies, E < ∼ 500 MeV, is known to be a rich source of information of lepton mixing parameters. We formulate a simple perturbative framework to elucidate the characteristic features of neutrino oscillation at around the solar-scale enhancement due to the matter effect. The clearest message we could extract from our perturbation theory is that CP violation in the appearance oscillation probability is large, a factor of ∼ 10 times larger than CP violation at around the atmospheric-scale oscillation maximum. Underlying mechanism for it is that one of the suppression factors on the CP phase dependent terms due to smallness of ∆m 2 21 /∆m 2 31 are dynamically lifted by the solar-scale enhancement. Our framework has a unique feature as a perturbation theory in which large ∆m 2 31 term outside the key 1-2 sector for the solar-scale resonance does not yield sizeable corrections. On the contrary, the larger the ∆m 2 31 , the smaller the higher order corrections. arXiv:1904.07853v1 [hep-ph] 16 Apr 2019 the oscillation probability in vacuum under the transformations ∆m 2 31 → −∆m 2 31 and δ → π − δ is broken by the matter potential [20]. Similarly, the interplay between the effects of δ, the matter potential, and the different mass orderings is summarized in a compact manner by the bi-probability plot introduced in [20]. 3 We are aware that the point of view described here may be too much simplified. See brief comments in section 7 for partially appending to the biased view on how to determine the remaining unknowns.

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“…Newer analyses[150] expand this volume using a new likelihood selection technique which has not been employed in the search for sterile neutrinos yet.…”

mentioning

confidence: 99%

Status of light sterile neutrino searches

Böser

Buck

Giunti

et al. 2020

Progress in Particle and Nuclear Physics

209

195

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A number of anomalous results in short-baseline oscillation may hint at the existence of one or more light sterile neutrino states in the eV mass range and have triggered a wave of new experimental efforts to search for a definite signature of oscillations between active and sterile neutrino states. The present paper aims to provide a comprehensive review on the status of light sterile neutrino searches in mid-2019: we discuss not only the basic experimental approaches and sensitivities of reactor, source, atmospheric, and accelerator neutrino oscillation experiments but also the complementary bounds arising from direct neutrino mass experiments and cosmological observations. Moreover, we review current results from global oscillation analyses that include the constraints set by running reactor and atmospheric neutrino experiments. They permit to set tighter bounds on the active-sterile oscillation parameters but as yet are not able to provide a definite conclusion on the existence of eV-scale sterile neutrinos.

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Atmospheric neutrino oscillation analysis with improved event reconstruction in Super-Kamiokande IV

Cited by 74 publications

References 31 publications

Neutrino physics with the PTOLEMY project: active neutrino properties and the light sterile case

Neutrino physics with the PTOLEMY project: active neutrino properties and the light sterile case

Perturbing neutrino oscillations around the solar resonance

Status of light sterile neutrino searches

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