700 research outputs found
Neutrino oscillograms of the Earth: effects of 1-2 mixing and CP-violation
We develop a comprehensive description of three flavor neutrino oscillations
inside the Earth in terms of neutrino oscillograms in the whole range of nadir
angles and for energies above 0.1 GeV. The effects of the 1-2 mass splitting
and mixing as well the interference of the 1-2 and 1-3 modes of oscillations
are quantified. The 1-2 mass splitting and mixing lead to the appearance, apart
from the resonance MSW peaks, of the parametric resonance peak for
core-crossing trajectories at E_nu ~= 0.2 GeV. We show that the interference
effects, in particular CP violation, have a domain structure with borders
determined by the solar and atmospheric magic lines and the lines of the
interference phase condition. The dependence of the oscillograms on the Dirac
CP-violating phase is studied. We show that for sin^2(2 theta13) < 0.1 the
strongest dependence of the oscillograms on delta is in the 1-2 and 1-3
resonance regions.Comment: 49 pages, LaTeX file using JHEP style, 13 figures included. Final
version to appear in JHE
Surgical Treatment of Stage I and II Thymus Epithelial Tumors
Thymic epithelial tumors are the most common tumors of the anterior mediastinum, with an incidence of 0.18 per 100,000 population. Here, we present a review of the national and foreign literature on the surgical treatment of stage I and II thymic epithelial tumors. The Medline (PubMed) and Russian Science Citation Index (eLibrary) databases were used as search engines. The focus of the review is the problem of choosing the optimal minimally invasive surgical approach for thymectomy, and the need for lymph node dissection for thymic epithelial tumors. A number of issues remain currently unresolved in thymic epithelial tumors surgery, namely the justification of the preoperative histological verification of the tumor process, the choice of the optimal surgical access to the anterior mediastinum, the need for and prognostic effect of lymph node dissection, and the determination of the required volume of the planned operation
Supernova neutrinos: difference of nu_mu - nu_tau fluxes and conversion effects
The formalism of flavor conversion of supernova neutrinos is generalized to
include possible differences in the fluxes of the muon and tau neutrinos
produced in the star. In this case the radiatively induced difference of the
nu_mu and nu_tau potentials in matter becomes important. The nu_mu and nu_tau
flux differences can manifest themselves in the effects of the Earth matter on
the observed nu_e (antinu_e) signal if: (i) the neutrino mass hierarchy is
normal (inverted); (ii) the solution of the solar neutrino problem is in the
LMA region; (iii) the mixing U_{e3} is relatively large: |U_{e3}|>10^{-3}. We
find that for differences in the nu_mu - nu_tau (antinu_mu - antinu_tau)
average energies and/or integrated luminosities < 20 %, the relative deviation
of the observed nu_e (antinu_e) energy spectrum at E > 50 MeV from that in the
case of the equal fluxes can reach 20 - 30 % (10 - 15 %) for neutrinos crossing
the Earth. It could be detected in future if large detectors sensitive to the
nu_e (antinu_e) energy spectrum become available. The study of this effect
would allow one to test the predictions of the nu_mu, nu_tau, antinu_mu,
antinu_tau fluxes from supernova models and therefore give an important insight
into the properties of matter at extreme conditions. It should be taken into
account in the reconstruction of the neutrino mass spectrum and mixing matrix
from the supernova neutrino observations. We show that even for unequal nu_mu
and nu_tau fluxes, effects of leptonic CP violation can not be studied in the
supernova neutrino experiments.Comment: LaTeX, 34 pages, 10 figures; minor changes to text and figures,
references and acknowledgements adde
Schubert calculus and Gelfand-Zetlin polytopes
We describe a new approach to the Schubert calculus on complete flag
varieties using the volume polynomial associated with Gelfand-Zetlin polytopes.
This approach allows us to compute the intersection products of Schubert cycles
by intersecting faces of a polytope.Comment: 33 pages, 4 figures, introduction rewritten, Section 4 restructured,
typos correcte
Probing the seesaw mechanism with neutrino data and leptogenesis
In the framework of the seesaw mechanism with three heavy right-handed
Majorana neutrinos and no Higgs triplets we carry out a systematic study of the
structure of the right-handed neutrino sector. Using the current low-energy
neutrino data as an input and assuming hierarchical Dirac-type neutrino masses
, we calculate the masses and the mixing of the heavy neutrinos.
We confront the inferred properties of these neutrinos with the constraints
coming from the requirement of a successful baryogenesis via leptogenesis. In
the generic case the masses of the right-handed neutrinos are highly
hierarchical: ; the lightest mass is GeV and the generated baryon-to-photon ratio is
much smaller than the observed value. We find the special cases which
correspond to the level crossing points, with maximal mixing between two
quasi-degenerate right-handed neutrinos. Two level crossing conditions are
obtained: (1-2 crossing) and (2-3
crossing), where and are respectively the 11-entry and the
12-subdeterminant of the light neutrino mass matrix in the basis where the
neutrino Yukawa couplings are diagonal. We show that sufficient lepton
asymmetry can be produced only in the 1-2 crossing where GeV, GeV and .Comment: 30 pages, 2 eps figures, JHEP3.cls, typos corrected, note (and
references) added on non-thermal leptogenesi
Real-time Monitoring for the Next Core-Collapse Supernova in JUNO
Core-collapse supernova (CCSN) is one of the most energetic astrophysical
events in the Universe. The early and prompt detection of neutrinos before
(pre-SN) and during the SN burst is a unique opportunity to realize the
multi-messenger observation of the CCSN events. In this work, we describe the
monitoring concept and present the sensitivity of the system to the pre-SN and
SN neutrinos at the Jiangmen Underground Neutrino Observatory (JUNO), which is
a 20 kton liquid scintillator detector under construction in South China. The
real-time monitoring system is designed with both the prompt monitors on the
electronic board and online monitors at the data acquisition stage, in order to
ensure both the alert speed and alert coverage of progenitor stars. By assuming
a false alert rate of 1 per year, this monitoring system can be sensitive to
the pre-SN neutrinos up to the distance of about 1.6 (0.9) kpc and SN neutrinos
up to about 370 (360) kpc for a progenitor mass of 30 for the case
of normal (inverted) mass ordering. The pointing ability of the CCSN is
evaluated by using the accumulated event anisotropy of the inverse beta decay
interactions from pre-SN or SN neutrinos, which, along with the early alert,
can play important roles for the followup multi-messenger observations of the
next Galactic or nearby extragalactic CCSN.Comment: 24 pages, 9 figure
Detection of the Diffuse Supernova Neutrino Background with JUNO
As an underground multi-purpose neutrino detector with 20 kton liquid scintillator, Jiangmen Underground Neutrino Observatory (JUNO) is competitive with and complementary to the water-Cherenkov detectors on the search for the diffuse supernova neutrino background (DSNB). Typical supernova models predict 2-4 events per year within the optimal observation window in the JUNO detector. The dominant background is from the neutral-current (NC) interaction of atmospheric neutrinos with 12C nuclei, which surpasses the DSNB by more than one order of magnitude. We evaluated the systematic uncertainty of NC background from the spread of a variety of data-driven models and further developed a method to determine NC background within 15\% with {\it{in}} {\it{situ}} measurements after ten years of running. Besides, the NC-like backgrounds can be effectively suppressed by the intrinsic pulse-shape discrimination (PSD) capabilities of liquid scintillators. In this talk, I will present in detail the improvements on NC background uncertainty evaluation, PSD discriminator development, and finally, the potential of DSNB sensitivity in JUNO
Potential of Core-Collapse Supernova Neutrino Detection at JUNO
JUNO is an underground neutrino observatory under construction in Jiangmen, China. It uses 20kton liquid scintillator as target, which enables it to detect supernova burst neutrinos of a large statistics for the next galactic core-collapse supernova (CCSN) and also pre-supernova neutrinos from the nearby CCSN progenitors. All flavors of supernova burst neutrinos can be detected by JUNO via several interaction channels, including inverse beta decay, elastic scattering on electron and proton, interactions on C12 nuclei, etc. This retains the possibility for JUNO to reconstruct the energy spectra of supernova burst neutrinos of all flavors. The real time monitoring systems based on FPGA and DAQ are under development in JUNO, which allow prompt alert and trigger-less data acquisition of CCSN events. The alert performances of both monitoring systems have been thoroughly studied using simulations. Moreover, once a CCSN is tagged, the system can give fast characterizations, such as directionality and light curve
Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector
A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements
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