1,228 research outputs found
Recent Developments in Parallelization of the Multidimensional Integration Package DICE
DICE is a general purpose multidimensional numerical integration package.
There can be two ways in the parallelization of DICE, "distributing random
numbers into workers" and "distributing hypercubes into workers". Furthermore,
there can be the combination of both ways. So far, we had developed the
parallelization code using the former way and reported it in ACAT2002 in
Moscow. Here, we will present the recent developments of parallelized DICE in
the latter way as the 2nd stage of our parallelization activities.Comment: 5 pages, 2 figures, Talk given at the X International Workshop on
Advanced Computing and Analysis Techniques in Physics Research, ACAT 2005,
DESY-Zeuthen, Germany, 22-27 May 200
A Feynman graph selection tool in GRACE system
We present a Feynman graph selection tool {\tt grcsel}, which is an
interpreter written in C language. In the framework of {\tt GRACE}, it enables
us to get a subset of Feynman graphs according to given conditions.Comment: 3 pages, 2 figures, Latex, ACAT200
Extraction of an Entanglement by Repetition of the Resonant Transmission of an Ancilla Qubit
A scheme for the extraction of entanglement in two noninteracting qubits
(spins) is proposed. The idea is to make use of resonant transmission of
ancilla qubit through the two fixed qubits, controlled by the entanglement in
the scatterers. Repetition of the resonant transmission extracts the singlet
state in the target qubits from their arbitrary given state. Neither the
preparation nor the post-selection of the ancilla spin is required, in contrast
to the previously proposed schemes.Comment: 14 pages, 7 figure
Selective writing and read-out of a register of static qubits
We propose a setup comprising an arbitrarily large array of static qubits
(SQs), which interact with a flying qubit (FQ). The SQs work as a quantum
register, which can be written or read-out by means of the FQ through quantum
state transfer (QST). The entire system, including the FQ's motional degrees of
freedom, behaves quantum mechanically. We demonstrate a strategy allowing for
selective QST between the FQ and a single SQ chosen from the register. This is
achieved through a perfect mirror located beyond the SQs and suitable
modulation of the inter-SQ distances.Comment: 14 pages, 4 figure
Boson Fusion and Higgs production at the LHC in six fermion final states with one charged lepton pair
Boson boson scattering and Higgs production in boson boson fusion will be
actively investigated at the LHC. We have performed a parton level study of all
processes of the type using for the first
time a full fledged six fermion Monte Carlo event generator which employs exact
matrix elements at \O(\alpha_{em}^6). We have examined Higgs production in
vector boson fusion followed by the decay chain ,
including exactly all electroweak irreducible backgrounds. In the high mass
region we have compared the case of a relatively light Higgs with the no-Higgs
case. The integrated cross section for the latter case is more than twice that
in the former for a minimum invariant mass of the pair of about 800 \GeV.
We find, in a preliminary anlysis at parton level that, summing up the muon and
the electron channels, about 30 events are expected in the light Higgs case for
L=100 .Comment: Final version published in Phys.Rev.
Anomalous Quartic and Couplings in Collision With Initial Beams and Final State Polarizations
The constraints on the anomalous quartic and
gauge boson couplings are investigated through the processes
and . Considering the
longitudinal and transverse polarization states of the final W or Z boson and
incoming beam polarizations we find 95% confidence level limits on the
anomalous coupling parameters and with an integrated luminosity
of 500 and =0.5, 1 TeV energies. Assuming the
couplings are independent of the
couplings we show that the longitudinal polarization state of the final gauge
boson improves the sensitivity to anomalous couplings by a factor of 2-3
depending on energy and coupling. An extra enhancement in sensitivity by a
factor of 1.3 comes from a set of initial beam polarizations
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