Sensitivity to light sterile neutrinos at ESSnuSB

We present a comprehensive analysis in the 3+1 active-sterile neutrino oscillation scenario for the sensitivity of the ESSnuSB experiment in the presence of light sterile neutrinos assuming both a far (FD) and a near (ND) detector. Our analysis show that when the ND is included, the results are significantly different compared to the ones obtained with the FD only. We find that the capability of ESSnuSB to constrain the sterile mixing parameters is sin2 2θμe∼ 10−4 for ∆m2 = 1 eV2 if the ND is included and it becomes sin2 2θμe∼ 10−2 without the ND. Furthermore, we show that the sensitivity can go down to sin2 2θμe∼ 10−3 for the most conservative choice of the systematics on the ND. Comparing the sensitivity with T2HK, T2HKK, and DUNE by considering the FD only, we find that the sensitivity of ESSnuSB is smaller for most of the parameter space. Studying the CP violation sensitivity, we find that if the ND is included, it can be larger in the 3+1 scenario than in the standard one. However, if the ND is not included, the sensitivity is smaller compared to the one in the standard scenario. We also find that the CP violation sensitivity due to δ13 is larger compared to the one induced by δ24. The sensitivities are slightly better for the dominant neutrino running ratio of ESSnuSBThis project is supported by the COST Action CA15139 “Combining forces for a novel European facility for neutrino-antineutrino symmetry-violation discovery” (EuroNuNet). It has also received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 777419. T.O. acknowledges support by the Swedish Research Council (Vetenskapsr˚adet) through Contract No. 2017-03934 and the KTH Royal Institute of Technology for a sabbatical period at the University of Iceland. S.R. acknowledges support from the “Spanish Agencia Estatal de Investigación” (AEI) and the EU “Fondo Europeo de Desarrollo Regional” (FEDER) through the project FPA2016-78645-P and the Spanish MINECO through the Centro de Excelencia Severo Ochoa Program under grant SEV-2016-0597, as well as from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreements 674896-Elusives and 690575-InvisiblesPlu

Long-baseline neutrino oscillation physics potential of the DUNE experiment

Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UA

The ESSnuSB design study: overview and future prospects

Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, los autores pertenecientes a la UAM y el nombre del grupo de colaboración, si lo hubiereESSnuSB is a design study for an experiment to measure the CP violation in the leptonic sector at the second neutrino oscillation maximum using a neutrino beam driven by the uniquely powerful ESS linear accelerator. The reduced impact of systematic errors on sensitivity at the second maximum allows for a very precise measurement of the CP violating parameter. This review describes the fundamental advantages of measurement at the second maximum, the necessary upgrades to the ESS linac in order to produce a neutrino beam, the near and far detector complexes, and the expected physics reach of the proposed ESSnuSB experiment, concluding with the near future developments aimed at the project realizationThis project has been supported by the COST Action EuroNuNet: “Combining forces for a novel European facility for neutrino-antineutrino symmetry-violation discovery”. It has also received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 777419. We acknowledge further support provided by the following research funding agencies: Centre National de la Recherche Scientifique and Institut National de Physique Nucléaire et de Physique des Particules, France; Deutsche Forschungsgemeinschaft, Germany, Projektnummer 423761110; Agencia Estatal de Investigacion through the grants IFT Centro de Excelencia Severo Ochoa, Spain, contract No. CEX2020-001007-S and PID2019-108892RB funded by MCIN/AEI/10.13039/501100011033; Polish Ministry of Science and Higher Education, grant No. W129/H2020/2018, with the science resources for the years 2018–2021 for the realisation of a cofunded project; Ministry of Science and Education of Republic of Croatia grant No. KK.01.1.1.01.0001; Çukurova University Scientific Research Projects Unit, Grant no: FUA-2021-12628; as well as support provided by the universities and laboratories to which the authors of this report are affiliated, see the author list on the first page. Funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union. Neither the European Union nor the granting authority can be held responsible for the

Neutrino interaction classification with a convolutional neural network in the DUNE far detector

Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UA

Understanding the first measurement of B(B→Kννˉ)\mathcal{B}(B\to K \nu \bar{\nu})

Recently, Belle II reported on the first measurement of $\mathcal{B}(B^\pm\to K^\pm \nu\bar{\nu})$ which appears to be almost $3\sigma$ larger than predicted in the Standard Model. We point out the important correlation with $\mathcal{B}(B\to K^{\ast} \nu\bar{\nu})$ so that the measurement of that decay mode could help restraining the possible options for building the model of New Physics. We then try to interpret this new experimental result in terms of physics beyond the Standard Model by using SMEFT and find that a scenario with coupling only to $\tau$ can accommodate the current experimental constraints but fails in getting a desired $R_{D^{(\ast )}}^\mathrm{exp}/R_{D^{(\ast )}}^\mathrm{SM}$, unless one turns the other SMEFT operators that are not related to $b\to s\ell\ell$ or/and $b\to s\nu\nu$.Comment: 8 pages, 6 figure

ν electroweak baryogenesis

We investigate if the CP violation necessary for successful electroweak baryo- genesis may be sourced by the neutrino Yukawa couplings. In particular, we consider an electroweak scale Seesaw realization with sizable Yukawas where the new neutrino singlets form (pseudo)-Dirac pairs, as in the linear or inverse Seesaw variants. We find that the baryon asymmetry obtained strongly depends on how the neutrino masses vary within the bubble walls. Moreover, we also find that flavour effects critically impact the final asymmetry obtained and that, taking them into account, the observed value may be obtained in some regions of the parameter space. This source of CP violation naturally avoids the strong constraints from electric dipole moments and links the origin of the baryon asymmetry of the Universe with the mechanism underlying neutrino masses. Interestingly, the mixing of the active and heavy neutrinos needs to be sizable and could be probed at the LHC or future collider experimentsEFM, TO and SRA acknowledge the support of the Spanish Agencia Estatal de Investigación and the EU “Fondo Europeo de Desarrollo Regional” (FEDER) through the projects PID2019-108892RB-I00/AEI/10.13039/501100011033 and FPA2016-78645-P as well as the “IFT Centro de Excelencia Severo Ochoa SEV-2016-0597”. JLP acknowledge the support from Generalitat Valenciana through the “plan GenT” program (CIDEGENT/2018/019) and from the Spanish MINECO under Grant FPA2017-85985-

Searching for solar KDAR with DUNE

Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAMThe observation of 236 MeV muon neutrinos from kaon-decay-at-rest (KDAR) originating in the core of the Sun would provide a unique signature of dark matter annihilation. Since excellent angle and energy reconstruction are necessary to detect this monoenergetic, directional neutrino flux, DUNE with its vast volume and reconstruction capabilities, is a promising candidate for a KDAR neutrino search. In this work, we evaluate the proposed KDAR neutrino search strategies by realistically modeling both neutrino-nucleus interactions and the response of DUNE. We find that, although reconstruction of the neutrino energy and direction is difficult with current techniques in the relevant energy range, the superb energy resolution, angular resolution, and particle identification offered by DUNE can still permit great signal/background discrimination. Moreover, there are non-standard scenarios in which searches at DUNE for KDAR in the Sun can probe dark matter interaction

Low exposure long-baseline neutrino oscillation sensitivity of the DUNE experiment

Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAMThe Deep Underground Neutrino Experiment (DUNE) will produce world-leading neutrino oscillation measurements over the lifetime of the experiment. In this work, we explore DUNE's sensitivity to observe charge-parity violation (CPV) in the neutrino sector, and to resolve the mass ordering, for exposures of up to 100 kiloton-megawatt-calendar years (kt-MW-CY), where calendar years include an assumption of 57% accelerator uptime based on past accelerator performance at Fermilab. The analysis includes detailed uncertainties on the flux prediction, the neutrino interaction model, and detector effects. We demonstrate that DUNE will be able to unambiguously resolve the neutrino mass ordering at a 4σ (5σ) level with a 66 (100) kt-MW-CY far detector exposure, and has the ability to make strong statements at significantly shorter exposures depending on the true value of other oscillation parameters, with a median sensitivity of 3σ for almost all true δCP values after only 24 kt-MW-CY. We also show that DUNE has the potential to make a robust measurement of CPV at a 3σ level with a 100 kt-MW-CY exposure for the maximally CP-violating values δCP = ±π/2. Additionally, the dependence of DUNE's sensitivity on the exposure taken in neutrino-enhanced and antineutrino-enhanced running is discussed. An equal fraction of exposure taken in each beam mode is found to be close to optimal when considered over the entire space of interes

The physics potential of a reactor neutrino experiment with Skipper CCDs: Measuring the weak mixing angle

We analyze in detail the physics potential of an experiment like the one recently proposed by the vIOLETA collaboration: a kilogram-scale Skipper CCD detector deployed 12 meters away from a commercial nuclear reactor core. This experiment would be able to detect coherent elastic neutrino nucleus scattering from reactor neutrinos, capitalizing on the exceptionally low ionization energy threshold of Skipper CCDs. To estimate the physics reach, we elect the measurement of the weak mixing angle as a case study. We choose a realistic benchmark experimental setup and perform variations on this benchmark to understand the role of quenching factor and its systematic uncertainties,background rate and spectral shape, total exposure, and reactor antineutrino flux uncertainty. We take full advantage of the reactor flux measurement of the Daya Bay collaboration to perform a data driven analysis which is, up to a certain extent, independent of the theoretical uncertainties on the reactor antineutrino flux. We show that, under reasonable assumptions, this experimental setup may provide a competitive measurement of the weak mixing angle at few MeV scale with neutrino-nucleus scattering.Comment: 11 pages, 6 figure

Ventanas de neutrinos al origen de la materia

Tesis doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Física Teórica. Fecha de lectura: 01-10-2021The Standard Model of particle Physics (SM) is a quantum eld theory based on the SU(3)c SU(2)L U(1)Y gauge group, which has so far precisely described strong and electroweak interactions between elementary particles. We know, however, that the SM cannot be the end of the story, as it is not able to give a consistent description of gravity. Thus, the SM has to be the low energy version of a more complete theory. Besides, there are other questions, both experimental and theoretical ones, which the SM cannot answer that call for the existence of Physics beyond the Standard Model (BSM). On the experimental side, the observation of non-baryonic particle dark matter (DM) in the Universe through its gravitational e ects call for an extension of the SM to include such new states. Additionally, through Big Bang nucleosynthesis (BBN) and CMB observations, we know that there is an imbalance between matter and antimatter. However, even though the SM has all the necessary ingredients to explain such an asymmetry, it was shown that it cannot generate the observed imbalance between baryons and antibaryons, such that BSM Physics is also necessary to explain this fact. Moreover, we have overwhelming evidence for BSM Physics from the observation of the neutrino oscillation phenomenon. This is arguably the clearest signal for BSM Physics from laboratory experiments. Thus, the neutrino sector seems a particularly green eld area of investigation in order to nd new Physics and to relating di erent open problems of the SM. This thesis focuses on the study of a future neutrino super beam to study neutrino oscillations and probe for the still unknown parameters characterizing the neutrino sector, such as CP violation, and the neutrino mass ordering. Secondly, we study the possibility that the DM is primarily interacting with neutrinos through the neutrino portal, and that therefore large neutrino detectors acting as observatories might be our best probe to explore the dark sector. Later on we will consider the possibility that a keV neutrino arising from the neutrino mass mechanism could be itself the DM. In the third part we will study the possible relation between the neutrino mass mechanism and the matter-antimatter asymmetr