scholarly journals Triggering On Hadronic Signatures In The Atlas Experiment-Developments For 2017 And 2018

2019 ◽  
Vol 214 ◽  
pp. 01017
Author(s):  
Emanuel Gouveia
Keyword(s):  
Top Quarks ◽  
New Physics ◽  
Beyond The Standard Model ◽  
New Techniques ◽  
Atlas Experiment ◽  
Missing Transverse Momentum ◽  
Physics Program ◽  
B Quarks ◽  
Gluon Jets ◽  
Pile Up

Hadronic signatures are critical to the ATLAS physics program, and are used extensively for both the StandardModel measurements and searches for new physics. These signatures include generic quark and gluon jets, as well as jets originating from b-quarks or the decay of massive particles (such as electroweak bosons or top quarks). Additionally, missing transverse momentum from non-interacting particles provides an interesting probe in the search for new physics beyond the Standard Model. Developing trigger selections that target these events is a hugechallenge at the LHC due to the enormous rates associated with hadronic signatures. This challenge is exacerbated by the amount of pile-up activity, which continues to grow. In order to address these challenges, several new techniques were developed to significantly improve the potential of the 2017 dataset. An overview of how we triggeron hadronic signatures at the ATLAS experiment is presented, outlining the challenges of hadronic object triggering and describing the improvements performed over the course of the Run 2 LHC data-taking program. The performance in Run 2 data is shown, including demonstrations of the new techniques being used in 2017. We also discuss further critical developments implemented for the rest of Run 2 and their performance in early 2018 data.

scholarly journals TOP QUARK PHYSICS AT THE TEVATRON

2013 ◽  
Vol 28 (08) ◽  
pp. 1330013 ◽  
Author(s):  
FRÉDÉRIC DÉLIOT ◽  
YVONNE PETERS ◽  
VERONICA SORIN
Keyword(s):  
Top Quark ◽  
Top Quarks ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Proton Antiproton ◽  
New Methods ◽  
Decay Properties ◽  
Large Program ◽  
The Standard Model ◽  
New Phenomena

The heaviest known elementary particle, the top quark, was discovered in 1995 by the CDF and D0 collaborations at the Tevatron proton–antiproton collider at Fermilab. Since its discovery, a large program was set in motion by the CDF and D0 collaborations to characterize the production and decay properties of top quarks, and investigate their potential for searches of new phenomena beyond the standard model. During the past 20 years, new methods were developed and implemented to improve the measurements and searches for new physics in the top quark sector. This paper reviews the achievements and results obtained through studies of the top quark at the Tevatron.

scholarly journals Status of Charm Flavor Physics

2006 ◽  
Vol 21 (27) ◽  
pp. 5381-5403 ◽  
Author(s):  
Ian Shipsey
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Flavor Physics ◽  
Form Factors ◽  
New Physics ◽  
Model Description ◽  
Beyond The Standard Model ◽  
Physics Program ◽  
The Standard Model ◽  
The Status

The role of charm in testing the Standard Model description of quark mixing and CP violation through measurements of lifetimes, decay constants and semileptonic form factors is reviewed. Together with Lattice QCD, charm has the potential this decade to maximize the sensitivity of the entire flavor physics program to new physics and pave the way for understanding physics beyond the Standard Model at the LHC in the coming decade. The status of indirect searches for physics beyond the Standard Model through charm mixing, CP-violation and rare decays is also reported.

scholarly journals Searching for physics beyond the Standard Model in an off-axis DUNE near detector

2022 ◽  
Vol 2022 (1) ◽  
Author(s):  
Moritz Breitbach ◽  
Luca Buonocore ◽  
Claudia Frugiuele ◽  
Joachim Kopp ◽  
Lukas Mittnacht
Keyword(s):  
New Physics ◽  
Special Role ◽  
Beyond The Standard Model ◽  
Dark Sector ◽  
Primary Target ◽  
Sterile Neutrinos ◽  
Near Detector ◽  
Physics Program ◽  
Weakly Coupled ◽  
The Standard Model

Abstract Next generation neutrino oscillation experiments like DUNE and T2HK are multi-purpose observatories, with a rich physics program beyond oscillation measurements. A special role is played by their near detector facilities, which are particularly well-suited to search for weakly coupled dark sector particles produced in the primary target. In this paper, we demonstrate this by estimating the sensitivity of the DUNE near detectors to the scattering of sub-GeV DM particles and to the decay of sub-GeV sterile neutrinos (“heavy neutral leptons”). We discuss in particular the importance of the DUNE-PRISM design, which allows some of the near detectors to be moved away from the beam axis. At such off-axis locations, the signal-to-background ratio improves for many new physics searches. We find that this leads to a dramatic boost in the sensitivity to boosted DM particles interacting mainly with hadrons, while for boosted DM interacting with leptons, data taken on-axis leads to marginally stronger exclusion limits. Searches for heavy neutral leptons perform equally well in both configurations.

scholarly journals The MoEDAL Experiment at the LHC - Searching for Physics Beyond the Standard Model

2018 ◽  
Vol 182 ◽  
pp. 02096
Author(s):  
James Pinfold
Keyword(s):  
Standard Model ◽  
Magnetic Monopole ◽  
Magnetic Charge ◽  
New Physics ◽  
Magnetic Monopoles ◽  
Beyond The Standard Model ◽  
Centre Of Mass ◽  
Mass Energy ◽  
Physics Program ◽  
The Standard Model

MoEDAL is a pioneering experiment designed to search for highly ionizing messengers of new physics such as magnetic monopoles or massive (pseudo-)stable charged particles, that are predicted to exist in a plethora of models beyond the Standard Model. It started data taking at the LHC at a centre-of-mass energy of 13 TeV, in 2015. MoEDAL’s ground breaking physics program defines a number of scenarios that yield potentially revolutionary insights into such foundational questions as: are there extra dimensions or new symmetries; what is the mechanism for the generation of mass; does magnetic charge exist; and what is the nature of dark matter. MoEDAL’s purpose is to meet such far-reaching challenges at the frontier of the field. We will present an overview of the MoEDAL detector, including the planned MAPP subdetector, as well as MoEDAL’s physics program. The concluding section highlights our first physics results on Magnetic Monopole production, that are the world’s best for Monopoles with multiple magnetic charge.

scholarly journals ISOLATED LEPTONS IN EVENTS WITH LARGE MISSING TRANSVERSE MOMENTUM AND THE SEARCH FOR SINGLE TOP PRODUCTION AT HERA

2006 ◽  
Vol 21 (25) ◽  
pp. 1901-1916 ◽  
Author(s):  
J. FERRANDO
Keyword(s):  
Transverse Momentum ◽  
Standard Model ◽  
New Physics ◽  
Beyond The Standard Model ◽  
High Transverse Momentum ◽  
Flavour Changing Neutral Currents ◽  
Proton Collisions ◽  
Missing Transverse Momentum ◽  
Single Top ◽  
The Standard Model

Recent results in searches for high transverse momentum leptons in events with large missing transverse momentum in electron–proton collisions at HERA are reviewed. These searches have implications for searches for physics beyond the Standard Model. The most recent results on searches for single top production via Flavour Changing Neutral Currents are reviewed. The consistency of results from the H1 and ZEUS collaborations and prospects of discovering new physics during the final year of HERA running are discussed.

scholarly journals Searches for new phenomena in final states involving leptons and jets using the ATLAS detector

2020 ◽  
Vol 35 (34n35) ◽  
pp. 2044004
Author(s):  
Tadej Novak
Keyword(s):  
Standard Model ◽  
New Physics ◽  
Atlas Detector ◽  
Beyond The Standard Model ◽  
Final States ◽  
Text Data ◽  
Atlas Experiment ◽  
The Standard Model ◽  
New Phenomena

Final states containing both leptons and jets can be used to probe for physics beyond the Standard Model. Searches for new physics models with these signatures, such as heavy neutrinos or leptoquarks, for example, are performed using the ATLAS experiment at the LHC. The results of the most recent searches on 13 TeV [Formula: see text] data will be presented.

scholarly journals STATUS OF CHARM FLAVOR PHYSICS

2005 ◽  
Vol 20 (22) ◽  
pp. 5119-5132 ◽  
Author(s):  
I. SHIPSEY
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Flavor Physics ◽  
Form Factors ◽  
New Physics ◽  
Model Description ◽  
Beyond The Standard Model ◽  
Physics Program ◽  
The Standard Model ◽  
The Status

The role of charm in testing the Standard Model description of quark mixing and CP violation through measurements of lifetimes, decay constants and semileptonic form factors is reviewed. Together with Lattice QCD, charm has the potential this decade to maximize the sensitivity of the entire flavor physics program to new physics. and pave the way for understanding physics beyond the Standard Model at the LHC in the coming decade. The status of indirect searches for physics beyond the Standard Model through charm mixing, CP-violation and rare decays is also reported.

scholarly journals Searches for new phenomena with the ATLAS detector

2020 ◽  
Vol 35 (34n35) ◽  
pp. 2044005
Author(s):  
Francesco Guescini
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
New Physics ◽  
Atlas Detector ◽  
Beyond The Standard Model ◽  
High Luminosity ◽  
Atlas Experiment ◽  
The Standard Model ◽  
New Phenomena

Many theories beyond the Standard Model predict new phenomena accessible by the Lhc. Searches for new physics are performed using the Atlas experiment at the Lhc focusing on exotic signatures that are predicted in several theories, excluding supersymmetry. The results of recent searches using 13 TeV data, with the exception of those for Dark Matter signatures, and their interplay and interpretation are presented. Prospects for searches at the High Luminosity Lhc are also discussed.

scholarly journals Recent CMS results in top and Higgs physics

2017 ◽  
Vol 32 (29) ◽  
pp. 1730026
Author(s):  
Rebeca Gonzalez Suarez
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Top Quark ◽  
Large Scale ◽  
Top Quarks ◽  
Large Mass ◽  
New Physics ◽  
Higgs Bosons ◽  
Physics Program ◽  
The Standard Model

After the Higgs boson discovery in 2012, the investigation of its properties and compatibility with the Standard Model predictions is central to the physics program of the LHC experiments. Likewise, the study of the top quark is still relevant at the LHC, more than two decades after its discovery at the Tevatron. Top quarks and Higgs bosons are produced at the LHC on a large scale and share a deep connection based on the large mass of the top quark. Both particles provide an excellent laboratory in which to search for new physics: the measurement of their properties tests the foundations of the Standard Model; and they feature prominently in a variety of exotic signals. The coupling of the Higgs boson to the top quark, a fundamental Standard Model parameter, can only be measured directly in processes where the two particles are produced together. The production of a Higgs boson together with one or two top quarks is also sensitive to several exciting new physics effects. A brief overview of the current experimental status of top quark and Higgs boson physics is presented using results from the CMS Collaboration.

scholarly journals Neutrino beam-dump experiment with FASER at the LHC

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Krzysztof Jodłowski ◽  
Sebastian Trojanowski
Keyword(s):  
High Energy ◽  
New Physics ◽  
Neutrino Interaction ◽  
Neutrino Beam ◽  
Beyond The Standard Model ◽  
Beam Dump ◽  
High Energies ◽  
Physics Program ◽  
The Standard Model ◽  
Oppositely Charged

Abstract The neutrino physics program at the LHC, which will soon be initiated by the FASER experiment, will provide unique opportunities for precision studies of neutrino interaction vertices at high energies. This will also open up the possibility to search for beyond the standard model (BSM) particles produced in such interactions in the specific high-energy neutrino beam-dump experiment. In this study, we illustrate the prospects for such searches in models with the dipole or Z′ portal to GeV-scale heavy neutral leptons. To this end, we employ both the standard signature of new physics that consists of a pair of oppositely-charged tracks appearing in the decay vessel, and the additional types of searches. These include high-energy photons and single scattered electrons. We show that such a variety of experimental signatures could significantly extend the sensitivity reach of the future multi-purpose FASER 2 detector during the High-Luminosity phase of the LHC.

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