96,018 research outputs found
Synergies between neutrino oscillation experiments: An `adequate' configuration for LBNO
Determination of the neutrino mass hierarchy, octant of the mixing angle
theta_{23} and the CP violating phase delta_{CP} are the unsolved problems in
neutrino oscillation physics today. In this paper our aim is to obtain the
minimum exposure required for the proposed Long Baseline Neutrino Oscillation
(LBNO) experiment to determine the above unknowns. We emphasize on the
advantage of exploiting the synergies offered by the existing and upcoming
long-baseline and atmospheric neutrino experiments in economising the LBNO
configuration. In particular, we do a combined analysis for LBNO, T2K, NOvA and
INO. We consider three prospective LBNO setups -- CERN-Pyhasalmi (2290 km),
CERN-Slanic (1500 km) and CERN-Frejus (130 km) and evaluate the adequate
exposure required in each case. Our analysis shows that the exposure required
from LBNO can be reduced considerably due to the synergies arising from the
inclusion of the other experiments.Comment: 22 pages, 14 figures, 2 tables Version published in JHE
Global constraints on absolute neutrino masses and their ordering
Within the standard three-neutrino framework, the absolute neutrino masses
and their ordering (either normal, NO, or inverted, IO) are currently unknown.
However, the combination of current data coming from oscillation experiments,
neutrinoless double beta decay searches, and cosmological surveys, can provide
interesting constraints for such unknowns in the sub-eV mass range, down to
O(0.1) eV in some cases. We discuss current limits on absolute neutrino mass
observables by performing a global data analysis, that includes the latest
results from oscillation experiments, neutrinoless double beta decay bounds
from the KamLAND-Zen experiment, and constraints from representative
combinations of Planck measurements and other cosmological data sets. In
general, NO appears to be somewhat favored with respect to IO at the level of
~2 sigma, mainly by neutrino oscillation data (especially atmospheric),
corroborated by cosmological data in some cases. Detailed constraints are
obtained via the chi^2 method, by expanding the parameter space either around
separate minima in NO and IO, or around the absolute minimum in any ordering.
Implications for upcoming oscillation and non-oscillation neutrino experiments,
including beta-decay searches, are also discussed.Comment: 17 pages, including 3 tables and 11 figure
Probing Neutrino Oscillation Parameters using High Power Superbeam from ESS
A high-power neutrino superbeam experiment at the ESS facility has been
proposed such that the source-detector distance falls at the second oscillation
maximum, giving very good sensitivity towards establishing CP violation. In
this work, we explore the comparative physics reach of the experiment in terms
of leptonic CP-violation, precision on atmospheric parameters, non-maximal
theta23, and its octant for a variety of choices for the baselines. We also
vary the neutrino vs. the anti-neutrino running time for the beam, and study
its impact on the physics goals of the experiment. We find that for the
determination of CP violation, 540 km baseline with 7 years of neutrino and 3
years of anti-neutrino (7nu+3nubar) run-plan performs the best and one expects
a 5sigma sensitivity to CP violation for 48% of true values of deltaCP. The
projected reach for the 200 km baseline with 7nu+3nubar run-plan is somewhat
worse with 5sigma sensitivity for 34% of true values of deltaCP. On the other
hand, for the discovery of a non-maximal theta23 and its octant, the 200 km
baseline option with 7nu+3nubar run-plan performs significantly better than the
other baselines. A 5sigma determination of a non-maximal theta23 can be made if
the true value of sin^2theta23 lesssim 0.45 or sin^2theta23 gtrsim 0.57. The
octant of theta23 could be resolved at 5sigma if the true value of sin^2theta23
lesssim 0.43 or gtrsim 0.59, irrespective of deltaCP.Comment: 21 pages, 37 pdf figures, 3 tables. Sensitivities quoted at 3 and
5\sigma. Discussion on CP asymmetry added. Numerical methods discussed in
detail. Some parts of the text rewritten. New references. Matches with
published versio
Particle Event Generator: A Simple-in-Use System PEGASUS version 1.0
PEGASUS is a parton-level Monte-Carlo event generator designed to calculate
cross sections for a wide range of hard QCD processes at high energy and
collisions, which incorporates the dynamics of transverse momentum
dependent (TMD) parton distributions in a proton. Being supplemented with
off-shell production amplitudes for a number of partonic subprocesses and
provided with necessary TMD gluon density functions, it produces weighted or
unweighted event records which can be saved as a plain data file or a file in a
commonly used Les Houches Event format. A distinctive feature of PEGASUS is an
intuitive and extremely user friendly interface, allowing one to easily
implement various kinematical cuts into the calculations. Results can be also
presented "on the fly" with built-in tool \textsc{pegasus plotter}. A short
theoretical basis is presented and detailed program description is given.Comment: 24 pages, 8 figure
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