106,054 research outputs found
Detecting the Higgs Bosons of Minimal Supergravity with Muon Pairs
The prospects at the CERN LHC are investigated for the discovery via decays
into muon pairs of neutral Higgs bosons in the minimal supergravity model.
Promising results are found for the CP-odd pseudoscalar () and the heavier
CP-even scalar () Higgs bosons at large . For
\tan\beta \agt 10 and 100 GeV \alt m_A,m_H \alt 550 GeV, the and the
masses could be precisely reconstructed from the dimuon invariant mass.Comment: 12 pages, REVTEX, 4 figure
Confirming the LHC Higgs Discovery with WW
We investigate the prospects of observing a neutral Higgs boson decaying into
a pair of bosons (one real and the other virtual), followed by the
decays into or at the CERN Large Hadron Collider
(LHC). Assuming that the missing transverse energy comes solely from the
neutrino in decay, we can reconstruct the masses and then the Higgs
mass. At the LHC with a center of mass energy () of 8 TeV and an
integrated luminosity () of 25 fb, we can potentially establish a
signal. A discovery of for
TeV can be achieved with 6 fb. The discovery of
implies that the recently discovered new boson is a CP-even scalar
if its spin is zero. In addition, this channel will provide a good opportunity
to study the coupling
Searching for the Higgs Bosons of Minimal Supersymmetry with Muon Pairs and Bottom Quarks
The prospects for the discovery of neutral Higgs bosons (phi^0 = H^0, h^0,
A^0) produced with bottom quarks via Higgs decays into muon pairs (pp --> b
b-bar phi^0 --> b b-bar mu mu-bar +X) at the CERN LHC are investigated in the
minimal supersymmetric model. The complete physics background from the
production of b b-bar mu mu-bar, b b-bar W^+ W^- (including t t-bar) and jj mu
mu-bar, j = g, u, d, s, c in the Standard Model is calculated with realistic
acceptance cuts. This discovery mode has a simple production mechanism from gg
--> b b-bar phi^0 with its cross section proportional to 1/cos^2(beta) and
could provide an opportunity to measure tan(beta) and the b b-bar phi^0
couplings. In addition, we compare the associated discovery mode above with the
inclusive discovery channel pp --> phi^0 --> mu mu-bar +X. Promising results
are found for the CP-odd pseudoscalar (A^0) and the heavier CP-even scalar
(H^0) Higgs bosons for tan(beta) equivalent to v_2/v_1 >~ 14 and m_A,m_H <~ 325
GeV.Comment: 12 pages, REVTeX, 4 Figure
Higgs Decays into Leptons
We discuss the prospects for the discovery of neutral Higgs bosons () in multi-Higgs doublet models via their decays into leptons at
hadron colliders. A major focus will be searching for Higgs bosons produced
with bottom quarks via Higgs decays into muon pairs () at the CERN Large Hadron Collider within the
framework of the minimal supersymmetric model.Comment: 3 pages, LaTeX with espcrc2.sty, 2 Figures, to appear in the
Proceedings of the 31st International Conference on High Energy Physics
(ICHEP 2002), July 24 - 31, 2002, in Amsterdam, The Netherland
The Carbon content in the Galactic CygnusX/DR21 star forming region
Observations of Carbon bearing species are among the most important
diagnostic probes of ongoing star formation. CO is a surrogate for H and is
found in the vicinity of star formation sites. There, [CI] emission is thought
to outline the dense molecular cores and extend into the lower density regions,
where the impinging interstellar UV radiation field plays a critical role for
the dissociation and ionization processes. Emission of ionized carbon ([CII])
is found to be even more extended than [CI] and is linking up with the ionized
medium. These different tracers emphasize the importance of multi-wavelength
studies to draw a coherent picture of the processes driving and driven by high
mass star formation. Until now, large scale surveys were only done with low
resolution, such as the COBE full sky survey, or were biased to a few selected
bright sources (e.g. Yamamoto et al. 2001, Schneider et al. 2003). A broader
basis of unbiased, high-resolution observations of [CI], CO, and [CII] may play
a key role to probe the material processed by UV radiation.Comment: 4 pages, 4 figure, to appear in "Proceedings of the 4th
Cologne-Bonn-Zermatt-Symposium", ed. S. Pfalzner, C. Kramer, C. Straubmeier,
and A. Heithausen (Springer Verlag
Discovering the Higgs Bosons of Minimal Supersymmetry with Tau Leptons and a Bottom Quark
We investigate the prospects for the discovery at the CERN Large Hadron
Collider or at the Fermilab Tevatron of neutral Higgs bosons through the
channel where the Higgs are produced together with a single bottom quark and
the Higgs decays into a pair of tau leptons, . We work within the framework of the minimal
supersymmetric model. The dominant physics background from the production of
, (), ,
and is calculated with realistic acceptance cuts and efficiencies.
Promising results are found for the CP-odd pseudoscalar () and the heavier
CP-even scalar () Higgs bosons with masses up to one TeV.Comment: 14 pages, 7 figure
Ground-based searches for interstellar H_(2)D^+
We present ground-based searches for the 1_(10) - 1_(11) line of interstellar H_(2)D^(+) at 372 GHz which are more sensitive than those obtained from the Kuiper Airborne Observatory by factors of 3-4 for extended sources and by more than two orders of magnitude for compact sources. The line was not detected in a variety of interstellar clouds, including NGC 2264 toward which a possible detection had been suggested previously. The inferred H_(2)D^(+) abundance limits of 10^(-10) - 10^(-11) are still consistent with, but approach the abundances predicted by chemical models. Simultaneous observations of the DCO^(+) 3-2 and N_(2)H^(+) 4-3 lines have been used to place additional limits on the H_(3)^(+) abundance, and suggest 10^(-11) < x(H_(3)^(+))< 10^(-9). The N_(2)H^(+) data also indicate that for NGC 2264, but perhaps not for the other sources, gas-phase N_2 contains a substantial fraction of the available nitrogen in the cloud
Higgs Boson Discovery Potential of LHC in the Channel
We discuss the SM Higgs discovery potential of LHC in the reaction when the jet is observed at sufficiently high to
be reliably identified. We conclude that this channel gives promising discovery
possibilities for the Higgs boson mass range 100-140 GeV, during LHC operation
at a low luminosity. With 30 fb of accumulated data and for
GeV about 100 signal events could be observed with the number of background
events larger by a factor of 2 only, showing a signal significance
. We use the difference of distributions in the partonic
subprocess energy for the signal and background for a better
separation of the signal.Comment: 15 pages including 6 figures, LaTeX, use epsfig.sty. To appear in
Phys.Lett.B. In this replacement minor LaTeX improvements are mad
Single Charged Higgs production as a probe of CP violation at a Muon Collider
We consider single charged Higgs () production in association with a
boson at colliders, in the context of the general CP
violating Two Higgs Doublet Model (2HDM). We find that large cross-sections for
the processes are possible, and offer an
attractive way of producing at colliders. The difference
in the cross-sections for and may exceed 1000 fb, and this
represents a novel way of probing CP violation in the Higgs sector.Comment: 15 pages, LaTex, 6 figure
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