1,943 research outputs found

### Canonical Constraints on Leptonic Cp Violation using UHCR neutrino fluxes

It is shown that one can in principle constrain the CP-violating parameter
delta from measurements of four independant |V_{ij}|^2, or three of them and a
ratio, in the leptonic sector. To quantify our approach, using unitarity, we
derive simple expressions in terms of four independant |V_{ij}|^2 for
cos(delta) and an expression for sin^2(delta) from J^2. Thus, depending on the
values of |V_{ij}| and their accuracy, we can set meaningful limits on |delta|.
To illustrate numerically, if |V_{u1}|^2 is close to 0.1 with a 10% precision,
and if |V_{e3}^2 is larger than 0.005 and for values of |V_{e2}|^2 and
|V_{u3}|^2 that stay within +-0.1 of the current experimental data leads to a
bound pi/2 < |delta| < pi. Alternatively, a certain combination of parameters
with values of |V_{e3}|^2 larger than 0.01 leads to a closed bound of 73 <
|delta| < 103. In general, we find that it is better to use |V_{u1}|^2 or
|V_{t1}|^2 as the fourth independant |V_{ij}|^2 and that over most of the
parameter space, delta is least sensitive to |V_{e3}|^2. With just three
independant measurements (solar, atmospheric and reactor) it is impossible to
set limits on the CP phase. In this respect, we study the use of ultra high
energy cosmic (UHCR) neutrino fluxes as the additional fourth information. We
find that within the SM, neutrino fluxes of all three flavours will be very
similar but that pushing current neutrino data to their extreme values still
allowed, ratios of cosmic neutrino fluxes can differ by up to 20%; such large
discrepancies could imply negligibly small CP-violation. We also study a non
radiative neutrino decay model and find that the neutrino fluxes can differ by
a factor of up to 3 within this model and that an accuracy of 10% on the
neutrino fluxes is sufficient to set interestin limits on delta.Comment: 8 pages, 2 figures, 5 table

### Extracting W Boson Couplings from the $e^{+}e^{-}$ Production of Four Leptons

We consider the processes $e^{+}e^{-}\rightarrow \ell^{+} \ell^{\prime -}\nu
\bar{\nu}^{\prime}$, including all possible charged lepton combinations, with
regard to measuring parameters characterizing the $W$ boson. We calculate at
what level these processes can be used to measure anamolous triple-boson
vertice coupling parameters for the cases of $e^{+}e^{-}$ colliders at 500
$GeV$ and 1 $TeV$ center of mass energies.Comment: 13 pages,OCIP/C-93-

### Preparedness to Counsel Transgender College Students: Perceptions of College Mental Health Clinicians

The purpose of this study was to assess the perceived preparedness levels of college mental health clinicians to counsel transgender college students. Multicultural counseling competency is required of professional counselors and transgender individuals are considered to be part of the multicultural population. A survey was completed by college mental health counselors (N = 84) from across the United States. The results showed a moderate amount of preparedness overall with no significant differences based on years of counseling experience nor graduation from a CACREP accredited program. Results did show the participants believed they do have a professional duty to be knowledgeable about gender identity issues. The majority of counselors surveyed spent between zero and five hours a week providing either individual or group counseling to transgender students, or providing consultation and collaboration on transgender student issues. Approximately two-thirds of the counselors surveyed used a trans-affirmative therapy model which is accepting and validating of all experiences of gender. Implications presented by this study include improving educational and training resources for counselor educators through additional quantitative and qualitative research into transgender counseling competencies. Additionally, providing professional development workshops for practicing professional counselors to build their knowledge and awareness of mental health issues in the transgender population will lead to increases in counselor self-efficacy

### The Measurement of Tri-Linear Gauge Boson Couplings at $e^+e^-$ Colliders

We describe a detailed study of the process $e^+e^- \to \ell\nu_\ell q
\bar{q}$ and the measurement of tri-linear gauge boson couplings (TGV's) at
LEP200 and at a 500~GeV and 1~TeV NLC. We included all tree level Feynman
diagrams contributing to the four-fermion final states including gauge boson
widths and non-resonance contributions. We employed a maximum likelihood
analysis of a five dimensional differential cross section of angular
distributions. This approach appears to offer an optimal strategy for
measurement of TGV's. LEP200 will improve existing measurements of TGV's but
not enough to see loop contributions of new physics. Measurements at the NLC
will be roughly 2 orders of magnitude more precise which would probe the
effects of new physics at the loop level.Comment: Latex file uses aipbook.sty with revtex and psfig.sty. 2 figures
(uuencoded) will be added with figures command. Full postcript version with
embedded figures is available at
ftp://ftp.physics.carleton.ca/pub/theory/godfrey/ocipc9504.ps To appear in
the Proceedings of the International Symposium on Vector Boson
Self-Interactions, UCLA, Feb. 1-3, 199

### Radiative lepton flavor violating decays in the Randall Sundrum background with localized leptons

We study the radiative lepton flavor violating l_i -> l_j\gamma decays in the
two Higgs doublet model, respecting the Randall Sundrum scenario and estimate
the contributions of the KK modes of left (right) handed charged lepton
doublets (singlets) on the branching ratios. We observe that the branching
ratios are sensitive to the contributions of the charged lepton KK modes.Comment: 23 pages, 10 figures, 2 table

### $\mu\to e\gamma$ Decay in the Left-Right Supersymmetric Model

We calculate the rate of the decay $\mu \to e\gamma$ and the electric dipole
moment of the electron in the left-right supersymmetric model when the breaking
of parity occurs at a considerably large scale. The low-energy flavor violation
in the model originates either from the nonvanishing remnants of the left-right
symmetry in the slepton mass matrix or from the direct flavor changing
lepton-slepton-neutralino interaction. The result is found to be large for the
masses of the supersymmetric particles not far from the electroweak scale and
already accessible at the current experimental accuracy. It also provides
nontrivial constraints of the lepton mixing in the model.Comment: 10 pages, LaTeX, 1 figur

- â€¦