409 research outputs found
Distinguishing Color-Octet and Color-Singlet Resonances at the Large Hadron Collider
Di-jet resonance searches are simple, yet powerful and model-independent,
probes for discovering new particles at hadron colliders. Once such a resonance
has been discovered it is important to determine the mass, spin, couplings,
chiral behavior and color properties to determine the underlying theoretical
structure. We propose a new variable which, in the absence of decays of the
resonance into new non-standard states, distinguishes between color-octet and
color-singlet resonances. To keep our study widely applicable we study
phenomenological models of color-octet and color-singlet resonances in flavor
universal as well as flavor non-universal scenarios. We present our analysis
for a wide range of mass (2.5 - 6 TeV), couplings and flavor scenarios for the
LHC with center of mass energy of 14 TeV and varying integrated luminosities of
30, 100, 300 and 1000 . We find encouraging results to
distinguish color-octet and color-singlet resonances for different flavor
scenarios at the LHC.Comment: 24 pages, 5 figures, 1 tabl
Probing Color Octet Couplings at the Large Hadron Collider
Color-octet resonances arise in many well motivated theories beyond the
standard model. As colored objects they are produced copiously at the LHC and
can be discovered in early searches for new physics in dijet final states. Once
they are discovered it will be important to measure the couplings of the new
resonances to determine the underlying theoretical structure. We propose a new
channel, associated production of gauge bosons and color-octet
resonances, to help determine the chiral structure of the couplings. We present
our analysis for a range of color-octet masses (2.5 to 4.5 TeV), couplings and
decay widths for the LHC with center of mass energy of 14 TeV and 10 or 100 of integrated luminosity. We find that the LHC
can probe a large region of the parameter space up to very small couplings.Comment: 19 pages, 9 figures, 3 table
Coloron Models and LHC Phenomenology
This talk discusses the possibility of new physics within the strong gauge
interactions, specifically the idea of an extended color gauge group that is
spontaneously broken to QCD. After a brief review of the literature, three of
our recent pieces of work on coloron phenomenology are summarized. First, some
key results on coloron production to NLO at hadron colliders are described.
Next, a method of using associated production of colorons and weak vector
bosons to better determine coloron couplings is discussed. Finally, a new model
that naturally realizes flavor physics is reviewed.Comment: 15 pages; 5 figures; contribution to SCGT12 "KMI-GCOE Workshop on
Strong Coupling Gauge Theories in the LHC Perspective", 4-7 Dec. 2012, Nagoya
University; new version fixes several minor text typos (including in one
reference
Parametrically controlling solitary wave dynamics in modified Kortweg-de Vries equation
We demonstrate the control of solitary wave dynamics of modified Kortweg-de
Vries (MKdV) equation through the temporal variations of the distributed
coefficients. This is explicated through exact cnoidal wave and localized
soliton solutions of the MKdV equation with variable coefficients. The solitons
can be accelerated and their propagation can be manipulated by suitable
variations of the above parameters. In sharp contrast with nonlinear
Schr\"{o}dinger equation, the soliton amplitude and widths are time
independent.Comment: 4 pages, 5 eps figure
Addressing family planning needs among low-literate population in peri-urban areas of Delhi, India: a qualitative inquiry
Background: Since several decades, population control has remained one of the major challenges for India. Understanding family planning (FP) related knowledge and practices, especially among low-literate population groups is important for increasing the reach of FP services nearer to them, which is an essential step for population control as well as to prevent unwanted pregnancies.Methods: We conducted a cross-sectional, qualitative research study among low literate population in peri-urban areas of New Delhi, bordered with Uttar Pradesh (U.P.) state. We selected and interviewed 27 participants including married men and women in the age range 18-34 years using semi-structured interview schedules. The focus of inquiry was on fertility awareness; beliefs and practices related to menstruation, pregnancy and FP methods etc. and decision making about FP. The data were processed for thematic analysis.Results: The study revealed lack of basic scientific knowledge about fertility in this community which often resulted into unwanted pregnancies. This finding has major implications especially when the Government’s FP program is geared mainly towards sterilization and conventional spacing methods. The study further confirmed that traditional beliefs and practices like separating women during menstruation still prevail in many joint families, but less likely in the nuclear ones. There were mixed opinions about spacing methods. Husband was reported to be main decision maker in FP process in this male dominated society. Regarding sources of information on FP, women reported elder women, lady clinicians and peers whereas men reported only peers.Conclusions: This study points out various barriers for FP around which basic FP education for both men and women in this community need to be provided. The study will have implications for other parts of India which share the same socio-cultural milieu as this community
Upper Bounds on Lepton-number Violating Processes
We consider four lepton-number violating (\lv) processes: (a) neutrinoless
double-beta decay (0\nu\beta\beta), (b) Delta L = 2 tau decays, (c) Delta L = 2
rare meson decays and (d) nuclear muon-positron conversion. In the absence of
exotic \lv interactions, the rates for these processes are determined by
effective neutrino masses _{\ell_1\ell_2}, which can be related to the sum
of light neutrino masses, the neutrino mass-squared differences, the neutrino
mixing angles, a Dirac phase and two Majorana phases. We sample the
experimentally allowed ranges of _{\ell_1\ell_2} based on neutrino
oscillation experiments as well as cosmological observations, and obtain a
stringent upper bound _{\ell_1\ell_2} \lsim 0.14 eV. We then calculate the
allowed ranges for _{\ell_1\ell_2} from the experimental rates of direct
searches for the above Delta L = 2 processes. Comparing our calculated rates
with the currently or soon available data, we find that only the
experiment may be able to probe _{ee} with a sensitivity
comparable to the current bound. Muon-positron conversion is next in
sensitivity, while the limits of direct searches for the other Delta L = 2
processes are several orders of magnitude weaker than the current bounds on
_{\ell_1\ell_2}. Any positive signal in those direct searches would indicate
new contributions to the \lv interactions beyond those from three light
Majorana neutrinos.Comment: 20 pages, revtex4, 2 figures (5 files), Version published in Physical
Review
Controlling pulse propagation in optical fibers through nonlinearity and dispersion management
In case of the nonlinear Schr\"odinger equation with designed group velocity
dispersion, variable nonlinearity and gain/loss; we analytically demonstrate
the phenomenon of chirp reversal crucial for pulse reproduction. Two different
scenarios are exhibited, where the pulses experience identical dispersion
profiles, but show entirely different propagation behavior. Exact expressions
for dynamical quasi-solitons and soliton bound-states relevant for fiber
communication are also exhibited.Comment: 4 pages, 5 eps figure
Quantum Hamilton-Jacobi analysis of PT symmetric Hamiltonians
We apply the quantum Hamilton-Jacobi formalism, naturally defined in the
complex domain, to a number of complex Hamiltonians, characterized by discrete
parity and time reversal (PT) symmetries and obtain their eigenvalues and
eigenfunctions. Examples of both quasi-exactly and exactly solvable potentials
are analyzed and the subtle differences, in the singularity structures of their
quantum momentum functions, are pointed out. The role of the PT symmetry in the
complex domain is also illustrated.Comment: 11 page
- …