A search for charged Higgs bosons produced in pairs is performed with data collected at centre-of-mass energies ranging from 189 to 209 GeV by ALEPH at LEP, corresponding to a total luminosity of ...629 pb
−1. The three final states
τ
+ν
ττ
−
ν
̄
τ
,
c
s
̄
τ
−
ν
̄
τ
and
c
s
̄
s
c
̄
are considered. No evidence for a signal is found and lower limits are set on the mass
m
H
±
as a function of the branching fraction
B(
H
+→τ
+ν
τ
)
. In the framework of a two-Higgs-doublet model, and assuming
B(
H
+→τ
+ν
τ
)+
B(
H
+→c
s
̄
)=1
, charged Higgs bosons with masses below 79.3 GeV/
c
2 are excluded at 95% confidence level independently of the branching ratios.
Searches for scalar top, scalar bottom and mass-degenerate scalar quarks are performed in the data collected by the ALEPH detector at LEP, at centre-of-mass energies up to 209 GeV, corresponding to ...an integrated luminosity of 675 pb
−1. No evidence for the production of such particles is found in the decay channels
t
̃
→
c/
uχ
,
t
̃
→
bℓ
ν
̃
,
b
̃
→
bχ
,
q
̃
→
qχ
or in the stop four-body decay channel
t
̃
→
bχ
f
f
̄
′
studied for the first time at LEP. The results of these searches yield improved mass lower limits. In particular, an absolute lower limit of 63 GeV/
c
2 is obtained for the stop mass, at 95% confidence level, irrespective of the stop lifetime and decay branching ratios.
A physiological pharmacokinetic (PPK) model, with blood, body, and brain compartments, was developed to estimate total plasma chlorotriazine (Cl-TRI) time courses (i.e., atrazine ATRA and its three ...chlorinated metabolites) after oral dosing with ATRA. The model, based on disposition data for super(14)C-ATRA, tracked two pools of compounds: (1) ATRA and chlorinated metabolites (i.e., the Cl-TRIs) and (2) glutathione conjugates. The PPK model developed from total radioactivity was valuable for assessing total plasma Cl-TRI concentrations, estimating blood protein binding rates of Cl-TRIs, and inferring relationships between tissue exposures of Cl-TRIs and administered dose. Absorption of radioactivity into plasma was slow with a rate constant of 0.2 h super(-1). super(14)C-disposition data indicated that Cl-TRIs react with red blood cells (presumably hemoglobin) and plasma proteins. Second-order rates of reaction of Cl-TRIs with hemoglobin and plasma protein were estimated to be 0.008 L/mmol/h and 1.14 x 10 super(-7) L/mg/h, respectively. A time-course study, conducted as part of this study, evaluated the absorption, disposition, and elimination characteristics of individual Cl-TRIs in plasma after a single oral dose of 90 mg ATRA/kg and indicated (1) that slow uptake into blood reflected both absorption and slow dissolution of the ATRA slurry and (2) that diaminochloro-s-triazine (DACT) was the major, persistent plasma Cl-TRI after oral dosing. Optimally, PK model development for pesticide compounds like atrazine should include a combination of radiolabeled studies for residues and speciation studies of important metabolites.
These reports present the results of the 2013 Community Summer Study of the APS Division of Particles and Fields ("Snowmass 2013") on the future program of particle physics in the U.S. Chapter 10, on ...Communication, Education, and Outreach, discusses the resources and issues for the communication of information about particle physics to teachers and students, to scientists in other fields, to policy makers, and to the general public.
We assess the coverage properties of confidence and credible intervals on the CMSSM parameter space inferred from a Bayesian posterior and the profile likelihood based on an ATLAS sensitivity study. ...In order to make those calculations feasible, we introduce a new method based on neural networks to approximate the mapping between CMSSM parameters and weak-scale particle masses. Our method reduces the computational effort needed to sample the CMSSM parameter space by a factor of ~ 10^4 with respect to conventional techniques. We find that both the Bayesian posterior and the profile likelihood intervals can significantly over-cover and identify the origin of this effect to physical boundaries in the parameter space. Finally, we point out that the effects intrinsic to the statistical procedure are conflated with simplifications to the likelihood functions from the experiments themselves.
We put forth conclusions and suggestions regarding the presentation of the LHC Higgs results that may help to maximize their impact and their utility to the whole High Energy Physics community.
This report summarizes the work of the Energy Frontier Higgs Boson working group of the 2013 Community Summer Study (Snowmass). We identify the key elements of a precision Higgs physics program and ...document the physics potential of future experimental facilities as elucidated during the Snowmass study. We study Higgs couplings to gauge boson and fermion pairs, double Higgs production for the Higgs self-coupling, its quantum numbers and \(CP\)-mixing in Higgs couplings, the Higgs mass and total width, and prospects for direct searches for additional Higgs bosons in extensions of the Standard Model. Our report includes projections of measurement capabilities from detailed studies of the Compact Linear Collider (CLIC), a Gamma-Gamma Collider, the International Linear Collider (ILC), the Large Hadron Collider High-Luminosity Upgrade (HL-LHC), Very Large Hadron Colliders up to 100 TeV (VLHC), a Muon Collider, and a Triple-Large Electron Positron Collider (TLEP).
ATL-PHYS-2003-006 The sensitivity of the ATLAS experiment to low mass SM Higgs produced via
Vector Boson Fusion mechanism with $H\to \gamma\gamma$ is invest igated. A cut
based event selection has ...been chosen to optimize the expected signal
significance with this decay mode. A signal significance of 2. 2$ \sigma$ may
be achieved for $M_H=130 \gev$ with 30 fb$^{-1}$ of accumulated luminosity.
ECONF C030908:MODT004,2003 We examine computational, conceptual, and philosophical issues in moving the
statistical techniques used in the LEP Higgs working group to the LHC.
Higher order corrections to the Higgs and the non-resonant ZZ production at
the LHC are evaluated within the context of the H->4l analysis for Higgs masses
120<MH<180 gev. The impact of experimental ...cuts on the Next-to-Leading Order K
factors for Higgs and non-resonant ZZ production is small. The discovery
potential of the H->4l modes is re-evaluated. With the application of
conservative higher order corrections the amount of luminosity needed to
achieve a 5 sigma signal significance with the H-> 4l modes drops by 30-35%,
depending on the Higgs mass.
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