12 research outputs found
Testing new-physics models with global comparisons to collider measurements: the Contur toolkit
Measurements at particle collider experiments, even if primarily aimed at
understanding Standard Model processes, can have a high degree of model
independence, and implicitly contain information about potential contributions
from physics beyond the Standard Model. The Contur package allows users to
benefit from the hundreds of measurements preserved in the Rivet library to
test new models against the bank of LHC measurements to date. This method has
proven to be very effective in several recent publications from the Contur
team, but ultimately, for this approach to be successful, the authors believe
that the Contur tool needs to be accessible to the wider high energy physics
community. As such, this manual accompanies the first user-facing version:
Contur v2. It describes the design choices that have been made, as well as
detailing pitfalls and common issues to avoid. The authors hope that with the
help of this documentation, external groups will be able to run their own
Contur studies, for example when proposing a new model, or pitching a new
search
Exploring Contur beyond its default mode: a case study
International audienceWe discuss Contur's different modes by studying a leptophobic Top-Colour (TC) model. We use, for the first time, higher order calculations for both the signal (NLO) and the background (up to NNLO). We compare the results between the different approaches of Contur. Furthermore, we compare these results to the ones coming from a direct search
Probing a leptophobic top-colour model with cross section measurements and precise signal and background predictions: a case study
The sensitivity of particle-level fiducial cross section measurements from ATLAS, CMS and LHCb to a leptophobic top-colour model is studied. The model has previously been the subject of resonance searches. Here we compare it directly to state-of-the-art predictions for Standard Model top quark production and also take into account next-to-leading order predictions for the new physics signal. We make use of the CONTUR framework to evaluate the sensitivity of the current measurements, first under the default CONTUR assumption that the measurement and the SM exactly coincide, and then using the full SM theory calculation for at next-to-leading and next-to-next-to-leading order as the background model. We derive exclusion limits, discuss the differences between these approaches, and compare to the limits from resonance searches by ATLAS and CMS
Exploring Contur beyond its default mode: a case study
International audienceWe discuss Contur's different modes by studying a leptophobic Top-Colour (TC) model. We use, for the first time, higher order calculations for both the signal (NLO) and the background (up to NNLO). We compare the results between the different approaches of Contur. Furthermore, we compare these results to the ones coming from a direct search
Precise predictions for electroweak production at the LHC in models with flavour non-diagonal boson couplings and bosons
International audienceWe report on our re-calculation of electroweak top-quark pair production in Standard Model extensions with extra heavy neutral and charged spin-1 particles at the LHC. In particular, we allow for flavour-non-diagonal couplings and take into account non-resonant production in the Standard Model and beyond. As in our previous work we include NLO QCD corrections and match to parton showers with the POWHEG method fully taking into account the Standard Model and new physics interference effects. We consider the Sequential Standard Model, Topcolour model as well as the Third Family Hypercharge Model featuring non-flavour diagonal couplings which has been proposed to explain the anomalies in decays. Numerical results for cross sections at hadron colliders with of up to 100 TeV are presented. We also investigate the numerical impact of the new non-resonant contributions
Recommended from our members
Beyond the Standard Model Physics at the HL-LHC and HE-LHC
This is the third out of five chapters of the final report [1] of the
Workshop on Physics at HL-LHC, and perspectives on HE-LHC [2]. It is devoted to
the study of the potential, in the search for Beyond the Standard Model (BSM)
physics, of the High Luminosity (HL) phase of the LHC, defined as
of data taken at a centre-of-mass energy of
, and of a possible future upgrade, the High Energy (HE) LHC,
defined as of data at a centre-of-mass energy of
. We consider a large variety of new physics models, both in a
simplified model fashion and in a more model-dependent one. A long list of
contributions from the theory and experimental (ATLAS, CMS, LHCb) communities
have been collected and merged together to give a complete, wide, and
consistent view of future prospects for BSM physics at the considered
colliders. On top of the usual standard candles, such as supersymmetric
simplified models and resonances, considered for the evaluation of future
collider potentials, this report contains results on dark matter and dark
sectors, long lived particles, leptoquarks, sterile neutrinos, axion-like
particles, heavy scalars, vector-like quarks, and more. Particular attention is
placed, especially in the study of the HL-LHC prospects, to the detector
upgrades, the assessment of the future systematic uncertainties, and new
experimental techniques. The general conclusion is that the HL-LHC, on top of
allowing to extend the present LHC mass and coupling reach by on most
new physics scenarios, will also be able to constrain, and potentially
discover, new physics that is presently unconstrained. Moreover, compared to
the HL-LHC, the reach in most observables will generally more than double at
the HE-LHC, which may represent a good candidate future facility for a final
test of TeV-scale new physics
Recommended from our members
Beyond the Standard Model Physics at the HL-LHC and HE-LHC
This is the third out of five chapters of the final report [1] of the
Workshop on Physics at HL-LHC, and perspectives on HE-LHC [2]. It is devoted to
the study of the potential, in the search for Beyond the Standard Model (BSM)
physics, of the High Luminosity (HL) phase of the LHC, defined as
of data taken at a centre-of-mass energy of
, and of a possible future upgrade, the High Energy (HE) LHC,
defined as of data at a centre-of-mass energy of
. We consider a large variety of new physics models, both in a
simplified model fashion and in a more model-dependent one. A long list of
contributions from the theory and experimental (ATLAS, CMS, LHCb) communities
have been collected and merged together to give a complete, wide, and
consistent view of future prospects for BSM physics at the considered
colliders. On top of the usual standard candles, such as supersymmetric
simplified models and resonances, considered for the evaluation of future
collider potentials, this report contains results on dark matter and dark
sectors, long lived particles, leptoquarks, sterile neutrinos, axion-like
particles, heavy scalars, vector-like quarks, and more. Particular attention is
placed, especially in the study of the HL-LHC prospects, to the detector
upgrades, the assessment of the future systematic uncertainties, and new
experimental techniques. The general conclusion is that the HL-LHC, on top of
allowing to extend the present LHC mass and coupling reach by on most
new physics scenarios, will also be able to constrain, and potentially
discover, new physics that is presently unconstrained. Moreover, compared to
the HL-LHC, the reach in most observables will generally more than double at
the HE-LHC, which may represent a good candidate future facility for a final
test of TeV-scale new physics
Beyond the Standard Model Physics at the HL-LHC and HE-LHC
This is the third out of five chapters of the final report [1] of the Workshop on Physics at HL-LHC, and perspectives on HE-LHC [2]. It is devoted to the study of the potential, in the search for Beyond the Standard Model (BSM) physics, of the High Luminosity (HL) phase of the LHC, defined as ab of data taken at a centre-of-mass energy of 14 TeV, and of a possible future upgrade, the High Energy (HE) LHC, defined as ab of data at a centre-of-mass energy of 27 TeV. We consider a large variety of new physics models, both in a simplified model fashion and in a more model-dependent one. A long list of contributions from the theory and experimental (ATLAS, CMS, LHCb) communities have been collected and merged together to give a complete, wide, and consistent view of future prospects for BSM physics at the considered colliders. On top of the usual standard candles, such as supersymmetric simplified models and resonances, considered for the evaluation of future collider potentials, this report contains results on dark matter and dark sectors, long lived particles, leptoquarks, sterile neutrinos, axion-like particles, heavy scalars, vector-like quarks, and more. Particular attention is placed, especially in the study of the HL-LHC prospects, to the detector upgrades, the assessment of the future systematic uncertainties, and new experimental techniques. The general conclusion is that the HL-LHC, on top of allowing to extend the present LHC mass and coupling reach by on most new physics scenarios, will also be able to constrain, and potentially discover, new physics that is presently unconstrained. Moreover, compared to the HL-LHC, the reach in most observables will, generally more than double at the HE-LHC, which may represent a good candidate future facility for a final test of TeV-scale new physics
Beyond the Standard Model Physics at the HL-LHC and HE-LHC
This is the third out of five chapters of the final report [1] of the Workshop on Physics at HL-LHC, and perspectives on HE-LHC [2]. It is devoted to the study of the potential, in the search for Beyond the Standard Model (BSM) physics, of the High Luminosity (HL) phase of the LHC, defined as of data taken at a centre-of-mass energy of , and of a possible future upgrade, the High Energy (HE) LHC, defined as of data at a centre-of-mass energy of . We consider a large variety of new physics models, both in a simplified model fashion and in a more model-dependent one. A long list of contributions from the theory and experimental (ATLAS, CMS, LHCb) communities have been collected and merged together to give a complete, wide, and consistent view of future prospects for BSM physics at the considered colliders. On top of the usual standard candles, such as supersymmetric simplified models and resonances, considered for the evaluation of future collider potentials, this report contains results on dark matter and dark sectors, long lived particles, leptoquarks, sterile neutrinos, axion-like particles, heavy scalars, vector-like quarks, and more. Particular attention is placed, especially in the study of the HL-LHC prospects, to the detector upgrades, the assessment of the future systematic uncertainties, and new experimental techniques. The general conclusion is that the HL-LHC, on top of allowing to extend the present LHC mass and coupling reach by on most new physics scenarios, will also be able to constrain, and potentially discover, new physics that is presently unconstrained. Moreover, compared to the HL-LHC, the reach in most observables will generally more than double at the HE-LHC, which may represent a good candidate future facility for a final test of TeV-scale new physics