Proceedings of The 20th International Workshop on Neutrinos — PoS(NuFACT2018)最新文献

{"title":"Neural network study of the nucleon axial form-factor","authors":"L. Alvarez-Ruso, K. Graczyk, E. Sala","doi":"10.22323/1.341.0101","DOIUrl":"https://doi.org/10.22323/1.341.0101","url":null,"abstract":"We have performed the first Bayesian neural-network analysis of neutrino-deuteron scattering data. The nucleon axial form factor has been extracted from quasielastic scattering data collected by the Argonne National Laboratory (ANL) bubble chamber experiment using a model-independent parametrization. The results are in agreement with previous determinations only when the low $0.05 < Q^2 < 0.10$~GeV$^2$ region is excluded from the analysis. This suggests that corrections from the deuteron structure may play a crucial role at low $Q^2$, although experimental errors in this kinematic region could have also been underestimated. With new and more precise measurements of neutrino-induced quasielastic scattering on hydrogen and deuterium, the present framework would be readily applicable to unravel the axial structure of the nucleon.","PeriodicalId":368027,"journal":{"name":"Proceedings of The 20th International Workshop on Neutrinos — PoS(NuFACT2018)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127719081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lepton Flavour Universality at LHCb","authors":"F. Dordei","doi":"10.22323/1.341.0133","DOIUrl":"https://doi.org/10.22323/1.341.0133","url":null,"abstract":"Lepton Flavour Universality implies the equality of the coupling between the gauge bosons and the three families of leptons. Semileptonic and rare decays of b quarks provide an ideal laboratory to test this property and to search for physics beyond the Standard Model. In these proceedings a review of the recent Lepton Flavour Universality tests performed using data collected by the LHCb experiment in 2011 and 2012 are presented.","PeriodicalId":368027,"journal":{"name":"Proceedings of The 20th International Workshop on Neutrinos — PoS(NuFACT2018)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133514269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Universal correlation between CP phase $delta$ and the non-unitarity $alpha$ parameter phases","authors":"H. Minakata, I. Martinez-Soler","doi":"10.22323/1.341.0154","DOIUrl":"https://doi.org/10.22323/1.341.0154","url":null,"abstract":"The non-unitarity of the neutrino mixing matrix is a problem related with a more fundamental question about the origin of the neutrino mass. After a brief discussion on the questions ``why do we need model-independent framework for unitarity test?'', we show interesting properties present in the oscillation probabilities of neutrinos propagating in matter with non-unitarity. That is, (1) partial unitarity and (2) universal phase correlation. \u0000% \u0000To illuminate these points, we formulate a perturbative framework with the two expansion parameters $epsilon equiv Delta m^2_{21} / Delta m^2_{31}$ and $alpha$ matrix elements. The complex triangular $alpha$ matrix is introduced through the definition of $3 times 3$ non-unitary flavor mixing matrix $N$ as \u0000% \u0000begin{eqnarray} \u0000N &=& \u0000left( bf{1} - alpha right) U = \u0000left{ \u0000bf{1} - \u0000left[ \u0000begin{array}{ccc} \u0000alpha_{ee} & 0 & 0 \u0000alpha_{mu e} & alpha_{mu mu} & 0 \u0000alpha_{tau e} & alpha_{tau mu} & alpha_{tau tau} \u0000end{array} \u0000right] \u0000right} \u0000U \u0000label{alpha-matrix-def} \u0000end{eqnarray} \u0000% \u0000where $U$ is the unitary MNS mixing matrix, and hence $alpha$ characterizes the size and the flavor dependence of unitarity violation (UV)footnote{ \u0000%%%%%%%%%%%%% \u0000Despite that in the physics literature UV usually means ``ultraviolet'', we use UV in this manuscript as an abbreviation for ``unitarity violation'' or ``unitarity violating''.}~~caused by new physics (NP) at low- or high-scales. \u0000 \u0000~~~~The point (1) above essentially means that despite non-unitary mixing, neutrino evolution must be unitary because the three active neutrinos span a complete state space of neutral leptons. The {em phase correlation} mentioned in the point (2) refers an intriguing property that the complex $alpha$ parameters and $nu$Standard Model CP phase $delta$ always come into the oscillation probabilities in a correlated way, $e^{- i delta } alpha_{mu e}$, $alpha_{tau e}$, and $e^{i delta} alpha_{tau mu}$, universally in all the oscillation channels. The physical meaning of this result is briefly discussed. }","PeriodicalId":368027,"journal":{"name":"Proceedings of The 20th International Workshop on Neutrinos — PoS(NuFACT2018)","volume":"293 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131827793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Challenges and Status of the ESSnuSB Accumulator Design","authors":"Y. Zou","doi":"10.22323/1.341.0117","DOIUrl":"https://doi.org/10.22323/1.341.0117","url":null,"abstract":"The 2.0 GeV, 5 MW proton linac for the European Spallation Source, ESS, will have the capacity to accelerate additional pulses, interleaved with the proton pulses for neutron production, and send them to a neutrino target, providing an excellent opportunity to produce an unprecedented high-performance neutrino beam, the ESS neutrino Super Beam (ESSnuSB), to measure, with precision, the CP violating phase at the 2nd oscillation maximum. In order to comply with the acceptance of the target and horn systems that will form the neutrino super beam, the long pulses from the linac must be compressed by about three orders of magnitude with minimal particle loss, something that will be achieved in an accumulator ring. This ring will accommodate about 10^15 protons, which means that several design challenges are encountered. Strong space charge forces, low-loss injection, efficient collimation, and e-p instabilities are some of the aspects central to the design work. Different pulse structures and injection painting schemes have been studied, with the goal of mitigating space charge effects and of minimizing the heating of the stripping foil despite the very high beam intensity. This paper presents the status of the accumulator ring design, with multi-particle simulations of the injection procedure.","PeriodicalId":368027,"journal":{"name":"Proceedings of The 20th International Workshop on Neutrinos — PoS(NuFACT2018)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122209451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A reappraisal of constraints on $Z^{prime}$ models from unitarity and direct searches at the LHC","authors":"Triparno Bandyopadhyay, G. Bhattacharyya, D. Das, A. Raychaudhuri","doi":"10.22323/1.341.0153","DOIUrl":"https://doi.org/10.22323/1.341.0153","url":null,"abstract":"We reexamine the ubiquitous $U(1)$ extension of the Standard Model (SM), with a new neutral gauge boson ($Z'$), in a truly model-independent approach. No new fermions, except for three right-handed neutrinos, are added. We use the current LHC Drell-Yan data to put model-independent constraints on the $Z'$ parameter space, defined by $M_{Z'}$, the $Z$-$Z'$ mixing angle ($alpha_z$) and the extra $U(1)$ effective gauge coupling ($g'_x$), which absorb all model dependence. Additional constraints are imposed from unitarity and $nu_mu$-$e$ scattering. However, limits extracted from direct searches turn out to be the most stringent.","PeriodicalId":368027,"journal":{"name":"Proceedings of The 20th International Workshop on Neutrinos — PoS(NuFACT2018)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115039597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Search for K+->pi+nunu at CERN","authors":"S. Trilov","doi":"10.22323/1.341.0042","DOIUrl":"https://doi.org/10.22323/1.341.0042","url":null,"abstract":"","PeriodicalId":368027,"journal":{"name":"Proceedings of The 20th International Workshop on Neutrinos — PoS(NuFACT2018)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124652516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Searches for heavy neutral lepton production and lepton flavour violation in kaon decays at the NA62 experiment","authors":"S. Trilov","doi":"10.22323/1.341.0127","DOIUrl":"https://doi.org/10.22323/1.341.0127","url":null,"abstract":"Searches for heavy neutral lepton (HNL) production in charged kaon decays using the data collected by the NA62 experiment at CERN are reported. Upper limits are established on the elements of the extended neutrino mixing matrix for heavy neutral lepton mass in the range 130-450 MeV, improving on the results from previous HNL production searches. The status and prospects of searches for lepton flavour and lepton number violation in kaon decays at the NA62 experiment is also presented.","PeriodicalId":368027,"journal":{"name":"Proceedings of The 20th International Workshop on Neutrinos — PoS(NuFACT2018)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131088291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Constraining neutrino transition magnetic moments","authors":"N. Dash, R. Moharana, Guofu Cao","doi":"10.22323/1.341.0046","DOIUrl":"https://doi.org/10.22323/1.341.0046","url":null,"abstract":"The article report a preliminary result of neutrino transition magnetic moments using DUNE LAr, HK and JUNO detectors. Neutrinos, if Majorana particles, because of the combined effect of magnetic field and matter effect in core-collapse supernova can transform some of νe to ν̄e due to spin flavour conversions. As a result of this conversions the inverse beta decay signal will have an increment indicating evidence of transition magnetic moments. The DUNE LAr is sensitive to νe, so will observe a deficiency of νe due to this conversion whereas both HK and JUNO which are sensitive to ν̄e will see excess of ν̄e. The DUNE LAr and JUNO are more or less sensitive to other type of neutrinos due to use of 40Ar and 12C. So can estimate the event ratio using both neutrinos and hence sensitivity on transition magnetic moments. Even an non observation of such conversion put a restrictive bound on the neutrino transition magnetic moments.","PeriodicalId":368027,"journal":{"name":"Proceedings of The 20th International Workshop on Neutrinos — PoS(NuFACT2018)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127344141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A High-efficiency Cosmic Ray Veto Detector for the Mu2e Experiment (Poster A)","authors":"B. Barton, Daniel Mills, C. Group","doi":"10.22323/1.341.0034","DOIUrl":"https://doi.org/10.22323/1.341.0034","url":null,"abstract":"","PeriodicalId":368027,"journal":{"name":"Proceedings of The 20th International Workshop on Neutrinos — PoS(NuFACT2018)","volume":"6 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125661831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Details of the NOvA oscillation analyses","authors":"Erica Smith","doi":"10.22323/1.341.0068","DOIUrl":"https://doi.org/10.22323/1.341.0068","url":null,"abstract":"NOvA is a long-baseline neutrino oscillation experiment that uses the NuMI beam from Fermilab. Two functionally identical detectors are placed off-axis, separated by 810 km. We study electron neutrino appearance and muon neutrino disappearance to probe unknown physics parameters such as the octant of q 23 , mass hierarchy","PeriodicalId":368027,"journal":{"name":"Proceedings of The 20th International Workshop on Neutrinos — PoS(NuFACT2018)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126585039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}