226 research outputs found
Constraining Supersymmetry using the relic density and the Higgs boson
Recent measurements by Planck, LHC experiments, and Xenon100 have significant
impact on supersymmetric models and their parameters. We first illustrate the
constraints in the mSUGRA plane and then perform a detailed analysis of the
general MSSM with 13 free parameters. Using SFitter, Bayesian and Profile
Likelihood approaches are applied and their results compared. The allowed
structures in the parameter spaces are largely defined by different mechanisms
of dark matter annihilation in combination with the light Higgs mass
prediction. In mSUGRA the pseudoscalar Higgs funnel and stau co-annihilation
processes are still avoiding experimental pressure. In the MSSM stau
co-annihilation, the light Higgs funnel, a mixed bino--higgsino region
including the heavy Higgs funnel, and a large higgsino region predict the
correct relic density. Volume effects and changes in the model parameters
impact the extracted mSUGRA and MSSM parameter regions in the Bayesian
analysis
HFI L2 DPC destripping and mapmaking modules
PoS(CMB2006)049International audienceThe data processing of the data from the High Frequency Instrument (HFI) of the Planck mission will use several modules. Destriping is expected to play a central role in the mapmaking stage. This paper outlines two existing HFI l2 DPC destriping modules together with estimations of their performances. MOKAPIX is a temperature data destriping tool based on scanning redundancies on the sky. We have developped another modules, BOGOPIX , based on the same philosophy, to perform simultaneously destriping and relative intercalibration
Implications of the Fleischer-Mannel Bound
Fleischer and Mannel (FM) have shown that it may become possible to constrain
the angle of the unitarity triangle from measurements of various
decays. This constraint is independent of hadronic uncertainties to
the few percent level. We show that, within the Standard Model, the FM bound
gives strong constraints on the CKM parameters. In particular, it could predict
a well defined sign for and . In a class of
extensions of the Standard Model, where the New Physics affects only (and, in particular, not ) processes, the FM bound can lead to
constraints on CP asymmetries in decays into final CP eigenstates even if
mixing is dominated by unknown New Physics. In our analysis, we use
a new method to combine in a statistically meaningful way the various
measurements that involve CKM parameters.Comment: 24 pages, revtex, 6 figures included using psfi
Towards Open Access Publishing in High Energy Physics : Report of the SCOAP3 Working Party
This Report concerns the implementation of a process today supported by leading actors from the particle physics community, and worked through in detail by members of an international Working Party. The initiative offers an opportunity for the cost-effective dissemination of high-quality research articles in particle physics, enabling use of the new technologies of e-Science across the literature of High Energy physics
Measurement of the B0-anti-B0-Oscillation Frequency with Inclusive Dilepton Events
The - oscillation frequency has been measured with a sample of
23 million \B\bar B pairs collected with the BABAR detector at the PEP-II
asymmetric B Factory at SLAC. In this sample, we select events in which both B
mesons decay semileptonically and use the charge of the leptons to identify the
flavor of each B meson. A simultaneous fit to the decay time difference
distributions for opposite- and same-sign dilepton events gives ps.Comment: 7 pages, 1 figure, submitted to Physical Review Letter
Operational experience with the DIRC detector
The {\sc Dirc}, a novel type of Cherenkov ring imaging device, is the primary hadronic particle identification system for the detector at the asymmetric B-factory, {\sc Pep-II} at SLAC. It is based on total internal reflection and uses long, rectangular bars made from synthetic fused silica as Cherenkov radiators and light guides. began taking data with colliding beams in late spring 1999. This paper describes the performance of the {\sc Dirc} during the first 2.5 years of operation
Core Cosmology Library: Precision Cosmological Predictions for LSST
The Core Cosmology Library (CCL) provides routines to compute basic
cosmological observables to a high degree of accuracy, which have been verified
with an extensive suite of validation tests. Predictions are provided for many
cosmological quantities, including distances, angular power spectra,
correlation functions, halo bias and the halo mass function through
state-of-the-art modeling prescriptions available in the literature. Fiducial
specifications for the expected galaxy distributions for the Large Synoptic
Survey Telescope (LSST) are also included, together with the capability of
computing redshift distributions for a user-defined photometric redshift model.
A rigorous validation procedure, based on comparisons between CCL and
independent software packages, allows us to establish a well-defined numerical
accuracy for each predicted quantity. As a result, predictions for correlation
functions of galaxy clustering, galaxy-galaxy lensing and cosmic shear are
demonstrated to be within a fraction of the expected statistical uncertainty of
the observables for the models and in the range of scales of interest to LSST.
CCL is an open source software package written in C, with a python interface
and publicly available at https://github.com/LSSTDESC/CCL.Comment: 38 pages, 18 figures, matches ApJS accepted versio
The DIRC Particle Identification System for the BABAR Experiment
A new type of ring-imaging Cherenkov detector is being used for hadronic particle identification in the BABAR experiment at the SLAC B Factory (PEP-II). This detector is called DIRC, an acronym for Detection of Internally Reflected Cherenkov (Light). This paper will discuss the construction, operation and performance of the BABAR DIRC in detail
Measurement of the CP-Violating Asymmetry Amplitude sin2
We present results on time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 88 million Y(4S) --> B Bbar decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We study events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B0 or B0bar from its decay products. The amplitude of the CP-violating asymmetry, which in the Standard Model is proportional to sin2beta, is derived from the decay-time distributions in such events. We measure sin2beta = 0.741 +/- 0.067 (stat) +/- 0.033 (syst) and |lambda| = 0.948 +/- 0.051 (stat) +/- 0.017 (syst). The magnitude of lambda is consistent with unity, in agreement with the Standard Model expectation of no direct CP violation in these modes
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