A comparative study between ESSnuSB and T2HK in determining the leptonic CP phase

Ghosh, Monojit; Ohlsson, Tommy

doi:10.1142/s0217732320500583

Cited by 17 publications

(14 citation statements)

References 26 publications

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“…3. Conversely, the CP violation search at the second oscillation maximum is not noticeably affected by the matter effect [30,77]. Changing the value of θ 23 , the ellipses almost keep the same shape and move in parallel along the CP conserving line, which causes the δ-θ 23 degeneracy [36,37].…”

Section: Measurements At the Second Oscillation Peakmentioning

confidence: 94%

“…The ellipses for different octants barely separate in the entire energy region, which implies a rather poor sensitivity to θ 23 in the appearance channel leading to octant degeneracies that can spoil both the determination of δ and of the mass ordering at the ESSνSB. Conversely, for experiments focusing on the first maxium the two ellipses for different octants are more separated [30], cf. the right panel in Fig.…”

Section: Measurements At the Second Oscillation Peakmentioning

confidence: 99%

“…Similarly the ν μ disappearance data and hence the precise determination of m 2 31 and sin 2 2θ 23 are negatively affected by the choice of the second oscillation maximum. The lack of knowledge on the octant of θ 23 can lead to "octant degeneracies" [29] that in turn somewhat limit the CP discovery potential of the ESSνSB [30]. The sensitivity to the mass ordering is also limited at the ESSνSB given the small matter effects from the low energy and short baseline.…”

Section: Introductionmentioning

confidence: 99%

“…The sensitivity to the mass ordering is also limited at the ESSνSB given the small matter effects from the low energy and short baseline. However, since these matter effects are small, the resulting "sign degeneracies" [31] do not compromise the sensitivity to δ of the facility [18,30].…”

Section: Introductionmentioning

confidence: 99%

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Physics potential of the ESS$$\nu $$SB

et al. 2020

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The ESSνSB project proposes to base a neutrino "Super Beam" of unprecedented luminosity at the European Spallation Source. The original proposal identified the second peak of the oscillation probability as the optimal to maximize the discovery potential to leptonic CP violation. However this choice reduces the statistics at the detector and penalizes other complementary searches such as the determination of the atmospheric oscillation parameters, particularly the octant of θ 23 as well as the neutrino mass ordering. We explore how these shortcomings can be alleviated by the combination of the beam data with the atmospheric neutrino sample that would also be collected at the detector. We find that the combination not only improves very significantly these drawbacks, but also enhances both the CP violation discovery potential and the precision in the measurement of the CP violating phase, for which the facility was originally optimized, by lifting parametric degeneracies. We then reassess the optimization of the ESSνSB setup when the atmospheric neutrino sample is considered, with an emphasis in performing a measurement of the CP violating phase as precise as possible. We find that for the presently preferred value of δ ∼ −π/2, shorter baselines and longer running time in neutrino mode would be optimal. In these conditions, a measurement better than 14 • would be achievable for any value of the θ 23 octant and the mass ordering. Conversely, if present and next generation facilities were not able to discover CP violation, longer baselines and more even splitting between neutrino and neutrino modes would be preferable. These choices would allow a 5σ discovery of CP violation for around a 60% of the possible values of δ and to determine its value with a precision around 6 • if it is close to 0 or π . a

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Section: Measurements At the Second Oscillation Peakmentioning

confidence: 94%

Section: Measurements At the Second Oscillation Peakmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Physics potential of the ESS$$\nu $$SB

et al. 2020

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“…The precision measurements of δ CP in future experiments have been previously discussed in Refs. [11,12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Precision measurements on δCP in MOMENT

Tang

Vihonen

Wang

2019

J. High Energ. Phys.

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As it is very promising to expect a discovery of CP violation in the leptonic sector, the precision measurement of the Dirac CP phase δ CP is going to be one of the key interests in the future neutrino oscillation experiments. In this work, we examine the physics reach of the proposed medium baseline muon decay experiment MOMENT. In order to identify potential bottlenecks and opportunities to improve CP precision in MOMENT, we investigate the effect of statistical error, systematic uncertainties, fraction of the muon beam polarity, and adjusting the baseline length to match the first or second oscillation maximum on the precision measurement of δ CP . We also simulate superbeam experiments T2K, NOνA, T2HK and DUNE in comparison and complementary to MOMENT. To reach the precision of δ CP at 10 • or better at 1 σ confidence level, we find it sufficient to combine the data of MOMENT, DUNE and T2HK.

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Exploring invisible neutrino decay at ESSnuSB

Choubey

Ghosh

Kempe

et al. 2021

J. High Energ. Phys.

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We explore invisible neutrino decay in which a heavy active neutrino state decays into a light sterile neutrino state and present a comparative analysis of two baseline options, 540 km and 360 km, for the ESSnuSB experimental setup. Our analysis shows that ESSnuSB can put a bound on the decay parameter τ3/m3 = 2.64 (1.68) × 10−11 s/eV for the baseline option of 360 (540) km at 3σ. The expected bound obtained for 360 km is slightly better than the corresponding one of DUNE for a charged current (CC) analysis. Furthermore, we show that the capability of ESSnuSB to discover decay, and to measure the decay parameter precisely, is better for the baseline option of 540 km than that of 360 km. Regarding effects of decay in δCP measurements, we find that in general the CP violation discovery potential is better in the presence of decay. The change in CP precision is significant if one assumes decay in data but no decay in theory.

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A comparative study between ESSnuSB and T2HK in determining the leptonic CP phase

Cited by 17 publications

References 26 publications

Physics potential of the ESS$$\nu $$SB

Physics potential of the ESS$$\nu $$SB

Precision measurements on δCP in MOMENT

Exploring invisible neutrino decay at ESSnuSB

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