Exploring non standard interactions effects in T2HK and DUNE

Brahma, Barnali; Giri, A.

doi:10.1140/epjc/s10052-022-11134-x

Cited by 4 publications

(4 citation statements)

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“…This discrepancy could be an interesting hint toward new physics. Recent studies [24][25][26] have demonstrated that the presence of ò eμ and ò eτ , where ò eμ and ò eτ are the dimensionless parameters that quantify the non-standard interactions arising from e − μ and e − τ sector respectively, can help alleviate the tension between NOvA and T2K in the measurement of δ CP .…”

Section: Introductionmentioning

confidence: 99%

“…As mentioned earlier, we make the assumption that the discrepancy in the value of δ CP is a result of some new physics effect, which we attribute the same due to the presence of NSI. To determine these NSI contributions, we extract the new physics couplings, specifically ò eμ from [24], which are summarized in table 2. It is quite plausible that NSI may induce other couplings.…”

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confidence: 99%

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Studying lepton flavor violating μ decays with vector leptoquark

Nayak,

Brahma,

Giri

2024

J. Phys. G: Nucl. Part. Phys.

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We study the charged LFV $\mu$ decays such as $\mu\rightarrow e\gamma$, $\mu \rightarrow eee$, and $(\mu - e)_{\text{Ti}}$ with a vector leptoquark ($U_3$) by considering the constraints from non-standard neutrino interaction (NSI) sector parameter $\epsilon_{e\mu}$. We consider that these NSIs are attributed to the presence of leptoquarks to account for the difference in the experimental observations of $\delta_{CP}$ measurement by NOvA and T2K ~\cite{nova,t2k}. In our study, we obtained the branching ratios with uncertainties for three decay modes:\begin{eqnarray*}\mathcal{B}(\mu \rightarrow e \gamma) \leq 4.6^{+3.8}_{-2.6} \times 10^{-18},\\ \mathcal{B}(\mu \rightarrow eee) \leq 9.57^{+7.43}_{-5.37} \times 10^{-21},\\\mathcal{B}(\mu \rightarrow e)_{\text{Ti}} \leq 6.89^{+5.61}_{-3.89} \times 10^{-19}.\end{eqnarray*}Our results show an improvement in the current limits, which can be explored in future experiments.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Studying lepton flavor violating μ decays with vector leptoquark

Nayak,

Brahma,

Giri

2024

J. Phys. G: Nucl. Part. Phys.

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“…NOνA prefers a lower octant, whereas T2K prefers a higher octant. We have explored the degeneracy issue for the standard model parameter θ 23 in the presence of NSI arising individually from both e − µ and e − τ sectors for DUNE and T2HK in the Ref [44].…”

Section: Introductionmentioning

confidence: 99%

Discernible NSI Effects in Long-Baseline Neutrino Experiments

Brahma¹,

Giri²

2023

Preprint

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Neutrino oscillation in the matter could get affected by the sub-dominant, yet unknown, nonstandard interactions. The upcoming long-baseline (LBL) neutrino experiments will be sensitive to these effects and can provide information on the unknown oscillation parameter values. In this article, we study the parameter degeneracies that can occur in DUNE, T2HK experiments, and a combination of both due to nonstandard interactions (NSI), arising simultaneously, from two different off-diagonal sectors, i.e., e − µ and e − τ . We derive constraints on both the NSI sectors using the combined datasets of NOνA and T2K. Our analysis reveals a significant impact that dual NSIs may have on the sensitivity of atmospheric mixing angle θ 23 in the normal ordering (NO) case. Furthermore, when non-standard interaction from the e − µ and e − τ sectors are included, we see significant changes in the probabilities for DUNE, T2HK, and as well as a combined analysis involving both. Moreover, the CP sensitivity gets affected significantly due to the presence of dual NSIs, and, in addition, the CP asymmetry also exhibits an appreciable difference.

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“…Recent results from T2K and NOvA show that in the case of the inverted mass ordering, the neutrino parameter i.e., 𝛿 𝐶 𝑃 from both T2K and NOvA look consistent with each other, but for the normal mass ordering, there appears to be tension (T2K points to the 𝛿 𝐶 𝑃 about 1.5𝜋 whereas NO𝜈A suggests the same parameter to be around 0.8𝜋). In the attempt to link the difference in 𝛿 𝐶 𝑃 , observed in T2K and NO𝜈A, we discuss the possibility of new physics in the form of non-standard interaction (NSI) [5]. Here, we investigate the CP violation and possible implications for the neutrino mass ordering, taking into account the results from T2K and NO𝜈A.…”

Section: Introductionmentioning

confidence: 99%

CP violation in T2HK and DUNE with non-standard interaction

Giri,

Brahma

2023

Proceedings of 21st Conference on Flavor Physics and CP Violation — PoS(FPCP2023)

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CP violation in the quark sector has been established, which is described by the CKM phenomenon, and we are entering the precision era as far as Flavor physics is concerned. Accumulation of more data from the LHCb and Belle II experiments will, hopefully, guide us to the pathways to physics beyond the standard model. Unfortunately, the tiny CP asymmetry observed in the quark sector cannot explain the overserved baryon asymmetry of the Universe. In this context, it is widely believed that leptonic CP violation could be the salvage. Interestingly, the measured non-zero value of 𝜃 13 has opened the door of optimism. Needless to mention, the determination of CP violating phase 𝛿 𝐶 𝑃 is the prime target of most of the current and upcoming neutrino experiments. Unfortunately, non-standard interactions can be a spoiler for the clean determination of the CP phase. We explore, the effect of non-standard interaction and study the prospects of its effect in the future experiments DUNE and T2HK, taking inputs from the currently running long baseline experiments, i.e., T2K and NOvA. Considering non-standard interaction effects from 𝑒 − 𝜇 and 𝑒 − 𝜏 sectors, we find interesting results concerning the probabilities, the octant of the 𝜃 23 , and the CP sensitivities, and therefore, a better understanding of the effects will be crucial for the cleaner determination of 𝛿 𝐶 𝑃 .

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Exploring non standard interactions effects in T2HK and DUNE

Cited by 4 publications

References 55 publications

Studying lepton flavor violating μ decays with vector leptoquark

Studying lepton flavor violating μ decays with vector leptoquark

Discernible NSI Effects in Long-Baseline Neutrino Experiments

CP violation in T2HK and DUNE with non-standard interaction

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