768 research outputs found
Multiple Interactions and Beam Remnants
Open issues on the structure of multiple interactions are outlined. An
improved model is summarized, with a new approach to correlated parton
densities in flavour, colour, longitudinal and transverse momenta, for both
hard-scattering partons and beam-remnant ones.Comment: LaTeX, 5 pages, submitted to the proceedings of the Workshop on
Physics at TeV Colliders, Les Houches, France, 26 May - 6 June 200
Soft-QCD and UE spectra in pp collisions at very high CM energies (a Snowmass white paper)
We make some educated guesses for the extrapolations of typical
soft-inclusive (minimum-bias, pileup, underlying-event) observables to
proton-proton collisions at center-of-mass energies in the range 13 - 100 TeV.
The numbers should be interpreted with (at least) a 10% uncertainty.Comment: 5 pages. Update (v2) adds numbers for 13 TeV and corrects bug in UE
ET density estimate
Searching for L-Violating Supersymmetry at the LHC
The possibility to simulate lepton number violating supersymmetric models has
been introduced into the recently updated PYTHIA event generator, now
containing 1278 decay channels of SUSY particles into SM particles via lepton
number violating interactions. This generator has been used in combination with
the ATLFAST detector simulation to study the impact of lepton number violation
(LV) on event topologies in the ATLAS detector, and trigger menus designed for
LV-SUSY are proposed based on very general considerations. In addition, a
rather preliminary analysis is presented on the possibility for ATLAS to
observe a signal above the background in several mSUGRA scenarios, using a
combination of primitive cuts and neural networks to optimize the
discriminating power between signal and background events over regions of
parameter space rather than at individual points. It is found that a 5 sigma
discovery is possible roughly for m_{1/2} < 1TeV and m_0 < 2TeV with an
integrated luminosity of 30fb^{-1}, corresponding to one year of data taking
with the LHC running at ``mid-luminosity'', L = 3*10^{33}s^{-1}cm^{-2}.Comment: 12 page
QCD (&) Event Generators
Recent developments in QCD phenomenology have spurred on several improved
approaches to Monte Carlo event generation, relative to the post--LEP state of
the art. In this brief review, the emphasis is placed on approaches for 1)
consistently merging fixed--order matrix element calculations with parton
showers, 2) improving the parton shower algorithms themselves, and 3) improving
the description of the underlying event in hadron collisions.Comment: Submitted to proceedings of DIS05, 12 page
A Quick Guide to SUSY Tools
The last decade has seen the emergence of a wide range of automated
calculations for supersymmetric extensions of the Standard Model. This guide
contains a brief summary of these, with the main focus on hadron collider
phenomenology, as well as a brief introduction to the so-called SUSY Les
Houches Accord. See also the Les Houches Web Repository for BSM Tools:
http://www.ippp.dur.ac.uk/montecarlo/BSM/Comment: 6 pages. Prepared for the TeV4LHC Physics Landscapes summary repor
QCD and studies at FCC-ee
The Future Circular Collider (FCC) is a post-LHC project aiming at searches
for physics beyond the SM in a new 80--100~km tunnel at CERN. Running in its
first phase as a very-high-luminosity electron-positron collider (FCC-ee), it
will provide unique possibilities for indirect searches of new phenomena
through high-precision tests of the SM. In addition, by collecting tens of
ab integrated luminosity in the range of center-of-mass energies
~=90--350~GeV, the FCC-ee also offers unique physics opportunities
for precise measurements of QCD phenomena and of photon-photon collisions
through, literally, billions of hadronic final states as well as unprecedented
large fluxes of quasireal 's radiated from the beams. We
succinctly summarize the FCC-ee perspectives for high-precision extractions of
the QCD coupling, for detailed analyses of parton radiation and fragmentation,
and for SM and BSM studies through collisions.Comment: 6 pages, Proceedings ICHEP'16 (Chicago
- …