1,814 research outputs found
Electroweak Radiative Corrections To Polarized M{\o}ller Scattering Asymmetries
One loop electroweak radiative corrections to left-right parity violating
M{\o}ller scattering () asymmetries are presented. They
reduce the standard model (tree level) prediction by 40 \% where the
main shift and uncertainty stem from hadronic vacuum polarization loops. A
similar reduction also occurs for the electron-electron atomic parity violating
interaction. That effect can be attributed to an increase of
by in running from to 0. The
sensitivity of the asymmetry to ``new physics'' is also discussed.Comment: 14 pages, Revtex, postscript file including figures is available at
ftp://ttpux2.physik.uni-karlsruhe.de/ttp95-14/ttp95-14.ps or via WWW at
http://ttpux2.physik.uni-karlsruhe.de/cgi-bin/preprints/ (129.13.102.139
Opening Eyes by Opening Classroom Doors: Multicultural Musings of Study Abroad in Italy
Abstract
Opening Eyes by Opening Classroom Doors:
Multicultural Musings of Study Abroad in Italy
This narrative inquiry examines multicultural site-based experiences of five pre-service teachers (early childhood and special education) during a four-week university sponsored study abroad program. Experiential learning (Kolb, 1984) opportunities were created for observations and teaching mini-lessons in Italian classrooms and immersion into Italian culture. The researcher’s study emanates from the pre-service teachers’ daily journal entries, informal conversations, and personal observations of reflections of their developing multicultural understandings, scaffolding upon their rural American backgrounds. To facilitate processing their lived experiences, it was necessary to work from an operational definition of culture (Nieto & Bode, 2012), collecting and interpreting data, and making their unique stories personally meaningful (Connelly and Clandinin, 2006). Conclusions indicate program goals of opening eyes through opening classroom doors were met, stimulating a wider global lens and a more critical, deeper understanding of others, moving beyond generalizations and stereotypes.
Keywords: Pre-service teachers, study abroad, multiculturalism, narrative inquir
Radiative Tail in Decay and Some Comments on Universality
The result of lowest-order perturbation theory calculations of the photon and
positron spectra in radiative pion(e2) decay are generalized to all orders of
perturbation theory using the structure-function method. An additional source
of radiative corrections to the ratio of the positron and muon channels of pion
decay, due to emission of virtual and real photons and pairs, is considered. It
depends on details of the detection of the final particles and is large enough
to be taken into account in theoretical estimates with a level of accuracy of
0.1%.Comment: 5 pages, LaTeX, some misprints are corrected, submitted to Pisma Zh.
Eksp. Teor. Fi
A new method for extracting the bottom quark Yukawa coupling at the CERN Large Hadron Collider
We propose a new method for measuring the H -> bb rate at the CERN LHC in a
manner which would allow extraction of the b quark Yukawa coupling. Higgs boson
production in purely electroweak WHjj events is calculated. The Standard Model
signal rate including decays W -> l nu and H -> bb is 11 fb for M_H = 120 GeV.
It is possible to suppress the principal backgrounds, Wbbjj and ttjj, to
approximately the level of the signal. As the top quark Yukawa coupling does
not appear in this process, it promises a reliable extraction of g_Hbb in the
context of the Standard Model or some extensions, such as the MSSM.Comment: added background, updated/added references, additional comment
Electroweak Radiative Corrections to Muon Capture
Electroweak radiative corrections to muon capture on nuclei are computed and
found to be sizable. They enhance the capture rates for hydrogen and helium by
2.8% and 3.0% respectively. As a result, the value of the induced pseudoscalar
coupling, g_P^exp, extracted from a recent hydrogen 1S singlet capture
experiment is increased by about 21% to g_P^exp = 7.3 +/- 1.2 and brought into
good agreement with the prediction of chiral perturbation theory,
g_P^theory=8.2 +/- 0.2. Implications for helium capture rate predictions are
also discussed.Comment: 6 page
SM Kaluza-Klein Excitations and Electroweak Precision Tests
We consider a minimal extension to higher dimensions of the Standard Model,
having one compactified dimension, and we study its experimental tests in terms
of electroweak data. We discuss tests from high-energy data at the -pole,
and low-energy tests, notably from atomic parity violation data. This
measurement combined with neutrino scattering data strongly restricts the
allowed region of the model parameters. Furthermore this region is incompatible
at 95% CL with the restrictions from high-energy experiments. Of course a
global fit to all data is possible but the for degree of
freedom is unpleasantly large.Comment: LaTex, 14 pages, 2 figures. More refs. and one comment about the
validity of our results for any number of extra dimensions adde
Rare kaon decays in SUSY with non-universal A terms
We study the rare kaon decays in the framework of general SUSY models. Unlike
the results in the literature, we find the contributions from the gluino
exchange to the branching ratio of can reach the
central value () of the new E787 data while the
predicted value of standard model is less than . We also find that
the same effects also enhance the decays of ,
and .Comment: 9 pages, references added, revised version to appear in J. Phys.
The Height of a Giraffe
A minor modification of the arguments of Press and Lightman leads to an
estimate of the height of the tallest running, breathing organism on a
habitable planet as the Bohr radius multiplied by the three-tenths power of the
ratio of the electrical to gravitational forces between two protons (rather
than the one-quarter power that Press got for the largest animal that would not
break in falling over, after making an assumption of unreasonable brittleness).
My new estimate gives a height of about 3.6 meters rather than Press's original
estimate of about 2.6 cm. It also implies that the number of atoms in the
tallest runner is very roughly of the order of the nine-tenths power of the
ratio of the electrical to gravitational forces between two protons, which is
about 3 x 10^32.Comment: 12 pages, LaTe
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