29 research outputs found
Light neutral CP-even Higgs boson within Next-to-Minimal Supersymmetric Standard model (NMSSM) at the Large Hadron electron Collider (LHeC)
We analyze the prospects of observing the light CP-even neutral Higgs bosons
() in their decays into quarks, in the neutral and charged
current production processes and at the upcoming LHeC,
with TeV. Assuming that the intermediate Higgs boson
() is Standard Model (SM)-like, we study the Higgs production within the
framework of NMSSM. We consider the constraints from Dark-matter, Sparticle
masses, and the Higgs boson data. The signal in our analysis can be classified
as three jets, with electron (missing energy)coming from the neutral (charged)
current interaction. We demand that the number of b-tagged jets in the central
rapidity region be greater or equal to two. The remaining jet is tagged in the
forward regions. With this forward jet and two -tagged jets in the central
region, we reconstructed three jets invariant masses. Applying some lower
limits on these invariant masses turns out to be an essential criterion to
enhance the signal--to--background rates, with slightly different sets of
kinematical selections in the two different channels. We consider almost all
reducible and irreducible SM background processes. We find that the non-SM like
Higgs boson, , would be accessible in some of the NMSSM benchmark points,
at approximately 0.4 (2.5) level in the +3j channel up to
Higgs boson masses of 75 GeV and in the +3j channel could be
discovered with 1.7 (2.4) level up to Higgs boson masses of 88
GeV with 100 fb of data in a simple cut-based (with optimization)
selection. With ten times more data accumulation at the end of the LHeC run and
using optimization, one can have 5 discovery in the electron (missing
energy) channel up to 85 (more than 90) GeV.Comment: 38 pages, 27 figures, version to be appeared in Phys.Rev.
CP-violating MSSM Higgs at Tevatron and LHC
We analyze the prospect for observing the intermediate neutral Higgs boson
() in its decay to two lighter Higgs bosons () at the presently
operating hadron colliders in the framework of the CP violating MSSM using the
PYTHIA event generator. We consider the lepton+ 4-jets+ \met channel from
associate production, with W h_2 \ra W h_1 h_1 \ra \ell \nu_\ell b
\bar b b\bar b. We require two or three tagged -jets. We explicitly
consider all relevant Standard Model backgrounds, treating -jets separately
from light flavor and gluon jets and allowing for mistagging. We find that it
is very hard to observe this signature at the Tevatron, even with 20 fb
of data, in the LEP--allowed region of parameter space due to the small signal
efficiency. At the LHC, a priori huge SM backgrounds can be suppressed by
applying judiciously chosen kinematical selections. After all cuts, we are left
with a signal cross section of around 0.5 fb, and a signal to background ratio
between 1.2 and 2.9. According to our analysis this Higgs signal should be
viable at the LHC in the vicinity of present LEP exclusion once 20 to 50
fb of data have been accumulated at TeV.Comment: 6 pages, 2 figures, talk presented at PASCOS 2010(Valencia) and SUSY
10(Bonn
Multilepton Signatures of the Higgs Boson through its Production in Association with a Top-quark Pair
We consider the possible production of the Higgs Boson in association with a
top-quark pair and its subsequent decay into a tau-lepton pair or a W-boson
pair. This process can give rise to many signatures of the Higgs boson. These
signatures can have electrons, muons, tau jets, bottom jets and/or light
flavour jets. We analyze the viability of some of these signatures. We will
look at those signatures where the background is minimal. In particular, we
explore the viability of the signatures "isolated 4 electron/muon" and
"isolated 3 electron/muon + a jet" The jet can be due to a light flavour
quark/gluon, a bottom quark, or a tau lepton. Of all these signatures, we find
that "isolated 3 electron/muon + a tau jet", with an extra bottom jet, can be
an excellent signature of this mode of the Higgs boson production. We show that
this signature may be visible within a year, once the Large Hadron Collider
(LHC) restarts. Some of the other signatures would also be observable after the
LHC accumulates sufficient luminosity.Comment: 11 pages, 1 Figur
CP-violating Supersymmetric Higgs at the Tevatron and LHC
We analyze the prospect for observing the intermediate neutral Higgs boson
() in its decay to two lighter Higgs bosons () at the presently
operating hadron colliders in the framework of the CP violating MSSM using the
PYTHIA event generator. We consider the lepton+ 4-jets+ \met channel from
associate production, with W h_2 \ra W h_1 h_1 \ra \ell \nu_\ell b
\bar b b\bar b. We require two, three or four tagged -jets. We explicitly
consider all relevant Standard Model backgrounds, treating -jets separately
from light flavor and gluon jets and allowing for mistagging. We find that it
is very hard to observe this signature at the Tevatron, even with 20 fb
of data, in the LEP--allowed region of parameter space due to the small signal
efficiency, even though the background is manageable. At the LHC, a priori huge
SM backgrounds can be suppressed by applying judiciously chosen kinematical
selections. After all cuts, we are left with a signal cross section of around
0.5 fb, and a signal to background ratio between 1.2 and 2.9. According to our
analysis this Higgs signal should be viable at the LHC in the vicinity of
present LEP exclusion once 20 to 50 fb of data have been accumulated at
TeV.Comment: 27 pages, 12 figure
CP-violating Higgs at Tevatron
We analyze the prospect for observing the intermediate neutral Higgs ()
boson in its decay to two lighter Higgs bosons () at the Tevatron in the
framework of the CP violating MSSM using the PYTHIA event generator. We
consider the lepton+ 4-jets+ \met channel from p \bar p \ra W h_2 \ra W h_1
h_1 \ra l \nu_l b \bar b b\bar b, with two or three tagged jets. We found
that it is very hard to observe this signature in the LEP-allowed region of
parameter space, due to the small signal efficiency.Comment: 3 pages, 3 figures, to appear in the proceedings of SUSY08, Seoul,
Kore
Sneutrino LSPs in R-parity violating minimal supergravity models
We consider the minimal supergravity model (mSUGRA) with one additional
R-parity violating operator at the GUT scale. The superparticles mass spectra
at the weak scale are generally altered due to the presence of the R-parity
violating coupling in the renormalization group equations. We show that a
lepton number violating coupling at the GUT scale can lead to a sneutrino as
the lightest supersymmetric particle (LSP) in a large region of parameter space
consistent with the muon anomalous magnetic moment and other precision
measurements. We also give characteristic collider signatures at the LHC.Comment: 3 pages, 3 figures, to appear in the proceedings of SUSY08, Seoul,
Kore