1,005 research outputs found
CP Violation from 5-dimensional QED
It has been shown that QED in (1+4)-dimensional space-time, with the fifth
dimension compactified on a circle, leads to CP violation (CPV). Depending on
fermionic boundary conditions, CPV may be either explicit (through the
Scherk--Schwarz mechanism), or spontaneous (via the Hosotani mechanism). The
fifth component of the gauge field acquires (at the one-loop level) a non-zero
vacuum expectation value. In the presence of two fermionic fields, this leads
to spontaneous CPV in the case of CP-symmetric boundary conditions.
Phenomenological consequences are illustrated by a calculation of the electric
dipole moment for the fermionic zero-modes.Comment: 11 pages, 2 figure
Bounds on the lightest Higgs boson mass with three and four fermion generations
We present lower bounds on the Higgs boson mass in the Standard Model with
three and four fermion generations SM(3,4), as well as upper bounds on the
lightest Higgs boson mass in the minimal supersymmetric extension of the SM
with three and four generations MSSM(3,4). Our analysis utilizes the SM(3,4)
renormalization-group-improved one-loop effective potential of the Higgs boson
to find the upper bounds on the Higgs mass in the MSSM(3,4) while the lower
bounds in the SM(3,4) are derived from considerations of vacuum stability. All
the bounds increase as the degenerate fourth generation mass increases,
providing more room in theory space that respects the increasing experimental
lower limit of the Higgs mass.Comment: 24 pages, 10 figures, Some additional discussion added. Final version
to be published in International Journal of Modern Physics
A Real-Time Energy Monitor System for the Ipns Linac
Injected beam energy and energy spread are critical parameters affecting the performance of our rapid cycling synchrotron (RCS). A real-time energy monitoring system is being installed to examine the H- beam out of the Intense Pulsed Neutron Source (IPNS) 50 MeV linac. The 200 MHz Alvarez linac serves as the injector for the 450 MeV IPNS RCS. The linac provides an 80 ms macropulse of approximately 3x1012 H- ions 30 times per second for coasting-beam injection into the RCS. The RCS delivers protons to a heavy-metal spallation neutron target for material science studies. Using a number of strip-line beam position monitors (BPMs) distributed along the 50 MeV transport line from the linac to the RCS, fast signals from the strip lines are digitized and transferred to a computer which performs an FFT. Corrections for cable attenuation and oscilloscope bandwidth are made in the frequency domain. Rectangular pulse train phasing (RPTP) is imposed on the spectra prior to obtaining the inverse transform (IFFT). After the IFFT, the reconstructed time-domain signal is analyzed for pulse width as it progresses along the transport line. Time-of-flight measurements of the BPM signals provide beam energy. Finally, using the 3-size measurement technique, the longitudinal emittance and energy spread of the beam are determined
Geometric Origin of CP Violation in an Extra-Dimensional Brane World
The fermion mass hierarchy and finding a predictive mechanism of the flavor
mixing parameters remain two of the least understood puzzles facing particle
physics today. In this work, we demonstrate how the realization of the Dirac
algebra in the presence of two extra spatial dimensions leads to complex
fermion field profiles in the extra dimensions. Dimensionally reducing to four
dimensions leads to complex quark mass matrices in such a fashion that CP
violation necessarily follows. We also present the generalization of the
Randall-Sundrum scenario to the case of a multi-brane, six-dimensional
brane-world and discuss how multi-brane worlds may shed light on the generation
index of the SM matter content.Comment: 24 pages, 1 figure; references adde
Report of the Beyond the MSSM Subgroup for the Tevatron Run II SUSY/Higgs Workshop
There are many low-energy models of supersymmetry breaking parameters which
are motivated by theoretical and experimental considerations. Here, we discuss
some of the lesser-known theories of low-energy supersymmetry, and outline
their phenomenological consequences. In some cases, these theories have more
gauge symmetry or particle content than the Minimal Supersymmetric Standard
Model. In other cases, the parameters of the Lagrangian are unusual compared to
commonly accepted norms (e.g., Wino LSP, heavy gluino LSP, light gluino, etc.).
The phenomenology of supersymmetry varies greatly between the different models.
Correspondingly, particular aspects of the detectors assume greater or lesser
importance. Detection of supersymmetry and the determination of all parameters
may well depend upon having the widest possible view of supersymmetry
phenomenology.Comment: 78 pages, 49 figures, to appear in the Proceedings of the Tevatron
Run II SUSY/Higgs Workshop. Editor: J. F. Gunion; BTMSSM Convenors: M.
Chertok, H. Dreiner, G. Landsberg, J. F. Gunion, J.D. Well
MuSiC: Identifying mutational significance in cancer genomes
Massively parallel sequencing technology and the associated rapidly decreasing sequencing costs have enabled systemic analyses of somatic mutations in large cohorts of cancer cases. Here we introduce a comprehensive mutational analysis pipeline that uses standardized sequence-based inputs along with multiple types of clinical data to establish correlations among mutation sites, affected genes and pathways, and to ultimately separate the commonly abundant passenger mutations from the truly significant events. In other words, we aim to determine the Mutational Significance in Cancer (MuSiC) for these large data sets. The integration of analytical operations in the MuSiC framework is widely applicable to a broad set of tumor types and offers the benefits of automation as well as standardization. Herein, we describe the computational structure and statistical underpinnings of the MuSiC pipeline and demonstrate its performance using 316 ovarian cancer samples from the TCGA ovarian cancer project. MuSiC correctly confirms many expected results, and identifies several potentially novel avenues for discovery
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