12,783 research outputs found
CP violation in charged Higgs boson decays into tau and neutrino
We calculate the CP-violating rate asymmetry of H^\pm decays into tau and
neutrino at one loop in the MSSM with complex parameters. We find that the
asymmetry is typically of the order of 10^-3, depending mainly on the phases of
the trilinear coupling A_\tau and of the gaugino mass M_1.Comment: 9 pages, 3 figures, uses JHEP3.cl
Advanced Luminescence Imaging of CIGS Solar Cells
The importance of CIGS based solar cells for terrestrial application increases steadily. A key issue for a high production yield are efficient inspection tools at the early stage of the production process. The present contribution focuses on imaging characterization of CIGS solar cells including photo and electroluminescence. PL imaging does not need electrical contacts and can be applied after the absorber deposition prior to the TCO deposition and the completion of the module. The effect of heat treatment on thermally evaporated In2S3 buffer layer with respect to the device performance is studied on the absorber amp;buffer stack by PL imaging. The correlation between PL intensity with achieved open circuit voltages of the completed devices has been established. It will be concluded that the quality of the buffer layer and the interface is well detectable at this early stage by PL imaging. The other issue addressed in this contribution is a characterization of graded gap absorbers by EL imaging. It will be demonstrated that luminescence imaging using optical bandpass filters can be used for the evaluation of the bandgap grading of CIGS absorbers fabricated by sequential processes. Furthermore, lateral inhomogeneities with respect to the In Ga intermixing can be detected already after the absorber deposition by the proposed PL imaging metho
The influence of chiral surface states on the London penetration depth in SrRuO
The London penetration depth for the unconventional superconductor
SrRuO is analyzed assuming an order parameter which breaks time
reversal symmetry and parity simultaneously. Such a superconducting state
possesses chiral quasiparticle states with subgap energies at the surface. We
show that these subgap states can give a significant contribution to the
low-temperature behavior of the London penetration depth yielding a
power-law even though bulk quasiparticle spectrum is gapped. The presence of
several electron bands gives rise to interband transition among the subgap
surface states and influences the properties of the surface impedance.
Furthermore, the surface states lead also to a non-linear Meissner effect.Comment: 4 pages, 1 figure, the definition of the Nambu field operator
introduced, and some typos correcte
The effect of uniaxial pressure on the magnetic anomalies of the heavy-fermion metamagnet CeRu2Si2
The effect of uniaxial pressure (P_u) on the magnetic susceptibility (X),
magnetization (M), and magnetoresistance (MR) of the heavy-fermion metamagnet
CeRu2Si2 has been investigated. For the magnetic field along the tetragonal c
axis, it is found that characteristic physical quantities, i.e., the
temperature of the susceptibility maximum (T_max), the pagamagnetic Weiss
temperature (Q_p), 1/X at 2 K, and the magnetic field of the metamagnetic
anomaly (H_M), scale approximately linearly with P_u, indicating that all the
quantities are related to the same energy scale, probably of the Kondo
temperature. The increase (decrease) of the quantities for P_u || c axis (P_u
|| a axis) can be attributed to a decrease (increase) in the nearest Ce-Ru
distance. Consistently in MR and X, we observed a sign that the anisotropic
nature of the hybridization, which is believed to play an important role in the
metamagnetic anomaly, can be controlled by applying the uniaxial pressure.
PACS numbers: 75.20.Hr, 71.27.+a, 74.62.FjComment: 7 pages, ReVTeX, 6 EPS figures : Will appear in Phys. Rev.
CP violating asymmetries in single top quark production at the Tevatron p pbar collider
Analytic expressions for the angular distributions of the -quarks
associated with single -quark production in and of the leptons from the subsequent decay are
obtained in the laboratory system. CP violation in the -production vertex is
assumed. Different angular and total cross section CP violating asymmetries are
considered. Relations testing CP violation solely in the -decay vertex are
also obtained. A numerical analysis is performed in the MSSM with a CP
violating phase of the trilinear coupling . The asymmetries are
typically of the order - .Comment: The numerical results are corrected and some changes that meet the
requirements of Phys. Rev. D are mad
From Double Chooz to Triple Chooz - Neutrino Physics at the Chooz Reactor Complex
We discuss the potential of the proposed Double Chooz reactor experiment to
measure the neutrino mixing angle . We especially consider
systematical uncertainties and their partial cancellation in a near and far
detector operation, and we discuss implications of a delayed near detector
startup. Furthermore, we introduce Triple Chooz, which is a possible upgrade
scenario assuming a second, larger far detector, which could start data taking
in an existing cavern five years after the first far detector. We review the
role of the Chooz reactor experiments in the global context of future neutrino
beam experiments. We find that both Double Chooz and Triple Chooz can play a
leading role in the search for a finite value of . Double
Chooz could achieve a sensitivity limit of at the
90%~confidence level after 5~years while the Triple Chooz setup could give a
sensitivity below .Comment: 18 pages, 6 figure
Physics Analysis Expert PAX: First Applications
PAX (Physics Analysis Expert) is a novel, C++ based toolkit designed to
assist teams in particle physics data analysis issues. The core of PAX are
event interpretation containers, holding relevant information about and
possible interpretations of a physics event. Providing this new level of
abstraction beyond the results of the detector reconstruction programs, PAX
facilitates the buildup and use of modern analysis factories. Class structure
and user command syntax of PAX are set up to support expert teams as well as
newcomers in preparing for the challenges expected to arise in the data
analysis at future hadron colliders.Comment: Talk from the 2003 Computing in High Energy and Nuclear Physics
(CHEP03), La Jolla, Ca, USA, March 2003, 7 pages, LaTeX, 10 eps figures. PSN
THLT00
Search for dinucleon decay into pions at Super-Kamiokande
A search for dinucleon decay into pions with the Super-Kamiokande detector
has been performed with an exposure of 282.1 kiloton-years. Dinucleon decay is
a process that violates baryon number by two units. We present the first search
for dinucleon decay to pions in a large water Cherenkov detector. The modes
O C, O
N, and O
O are investigated. No significant excess in the
Super-Kamiokande data has been found, so a lower limit on the lifetime of the
process per oxygen nucleus is determined. These limits are:
years,
years, and
years. The lower
limits on each mode are about two orders of magnitude better than previous
limits from searches for dinucleon decay in iron.Comment: 20 pages, 17 figures. Accepted for publication in Physical Review D
on March 30, 201
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