scholarly journals Search for pairs of scalar leptoquarks decaying into quarks and electrons or muons in $$ \sqrt{s} $$ = 13 TeV pp collisions with the ATLAS detector

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
G. Aad ◽  
◽  
B. Abbott ◽  
D. C. Abbott ◽  
A. Abed Abud ◽  
...  
Keyword(s):  
Large Hadron Collider ◽  
Hadron Collider ◽  
Branching Ratio ◽  
New Physics ◽  
Atlas Detector ◽  
Atlas Experiment ◽  
Upper Limits ◽  
The Standard Model ◽  
Quark Flavour ◽  
Scalar Leptoquarks

Abstract A search for new-physics resonances decaying into a lepton and a jet performed by the ATLAS experiment is presented. Scalar leptoquarks pair-produced in pp collisions at $$ \sqrt{s} $$ s = 13 TeV at the Large Hadron Collider are considered using an integrated luminosity of 139 fb−1, corresponding to the full Run 2 dataset. They are searched for in events with two electrons or two muons and two or more jets, including jets identified as arising from the fragmentation of c- or b-quarks. The observed yield in each channel is consistent with the Standard Model background expectation. Leptoquarks with masses below 1.8 TeV and 1.7 TeV are excluded in the electron and muon channels, respectively, assuming a branching ratio into a charged lepton and a quark of 100%, with minimal dependence on the quark flavour. Upper limits on the aforementioned branching ratio are also given as a function of the leptoquark mass.

SEARCH FOR THE STANDARD MODEL HIGGS BOSON WITH THE ATLAS DETECTOR

2013 ◽  
Vol 22 (07) ◽  
pp. 1330015
Author(s):  
◽  
DOMIZIA ORESTANO
Keyword(s):  
Higgs Boson ◽  
Large Hadron Collider ◽  
Standard Model ◽  
Particle Physics ◽  
Hadron Collider ◽  
Atlas Detector ◽  
Standard Model Higgs Boson ◽  
Cern Large Hadron Collider ◽  
Atlas Experiment ◽  
The Standard Model

This document presents a brief overview of some of the experimental techniques employed by the ATLAS experiment at the CERN Large Hadron Collider (LHC) in the search for the Higgs boson predicted by the standard model (SM) of particle physics. The data and the statistical analyses that allowed in July 2012, only few days before this presentation at the Marcel Grossman Meeting, to firmly establish the observation of a new particle are described. The additional studies needed to check the consistency between the newly discovered particle and the Higgs boson are also discussed.

scholarly journals Latest Higgs physics results with the ATLAS detector

2015 ◽  
Vol 39 ◽  
pp. 1560091 ◽  
Author(s):  
Domizia Orestano
Keyword(s):  
Higgs Physics ◽  
Higgs Boson ◽  
Large Hadron Collider ◽  
Hadron Collider ◽  
Atlas Detector ◽  
Scalar Boson ◽  
Current Sensitivity ◽  
Cern Large Hadron Collider ◽  
Atlas Experiment ◽  
The Standard Model

This report presents the investigations on the recently discovered scalar boson by the ATLAS experiment at the CERN Large Hadron Collider. The latest results fully exploit the data collected during LHC Run 1 to measure the properties of the new boson and within the current sensitivity confirm the identification of this particle with the Higgs boson of the Standard Model.

scholarly journals Search for Heavy Higgs Bosons with the ATLAS Detector

2018 ◽  
Vol 46 ◽  
pp. 1860056
Author(s):  
Jana Schaarschmidt
Keyword(s):  
Large Hadron Collider ◽  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
Hadron Collider ◽  
New Physics ◽  
Atlas Detector ◽  
Higgs Bosons ◽  
Final States ◽  
Atlas Experiment

The ATLAS experiment at the Large Hadron Collider performed searches for heavy Higgs bosons, whose presence would establish the existance of new physics. Searches for charged and neutral Higgs bosons are carried out using 8 or 13 TeV data for various production modes and in many different final states. No deviations from Standard Model expectations are observed. Exclusions limits are set on the production cross section and on parameters in various benchmark models.

scholarly journals B PHYSICS AT LHCb

2008 ◽  
Vol 23 (32) ◽  
pp. 5117-5136 ◽  
Author(s):  
MONICA PEPE ALTARELLI ◽  
FREDERIC TEUBERT
Keyword(s):  
Large Hadron Collider ◽  
Standard Model ◽  
B Physics ◽  
Hadron Collider ◽  
New Physics ◽  
Concise Review ◽  
The Standard Model ◽  
And Performance ◽  
Detector Design

LHCb is a dedicated detector for b physics at the LHC (Large Hadron Collider). In this paper we present a concise review of the detector design and performance together with the main physics goals and their relevance for a precise test of the Standard Model and search of New Physics beyond it.

scholarly journals AFTER THE STANDARD MODEL: NEW RESONANCES AT THE LHC

2009 ◽  
Vol 24 (01) ◽  
pp. 1-15 ◽  
Author(s):  
GUSTAAF BROOIJMANS
Keyword(s):  
Large Hadron Collider ◽  
Standard Model ◽  
Hadron Collider ◽  
Center Of Mass ◽  
New Physics ◽  
Mass Energy ◽  
High Expectations ◽  
Center Of Mass Energy ◽  
Energy Regime ◽  
The Standard Model

Experiments will soon start taking data at CERN's Large Hadron Collider (LHC) with high expectations for discovery of new physics phenomena. Indeed, the LHC's unprecedented center-of-mass energy will allow the experiments to probe an energy regime where the standard model is known to break down. Here, the experiments' capability to observe new resonances in various channels is reviewed.

scholarly journals Unleashing the full power of LHCb to probe Stealth New Physics

2021 ◽  
Author(s):  
Martino Borsato ◽  
Xabier Cid-Vidal ◽  
Yuhsin Tsai ◽  
Carlos Vázquez Sierra ◽  
Jose Francisco Zurita ◽  
...  
Keyword(s):  
Large Hadron Collider ◽  
Standard Model ◽  
Hadron Collider ◽  
Theoretical Models ◽  
New Physics ◽  
Precision Measurements ◽  
Beyond The Standard Model ◽  
Lhcb Experiment ◽  
The Standard Model ◽  
Full Power

Abstract In this paper, we describe the potential of the LHCb experiment to detect Stealth physics. This refers to dynamics beyond the Standard Model that would elude searches that focus on energetic objects or precision measurements of known processes. Stealth signatures include long-lived particles and light resonances that are produced very rarely or together with overwhelming backgrounds. We will discuss why LHCb is equipped to discover this kind of physics at the Large Hadron Collider and provide examples of well-motivated theoretical models that can be probed with great detail at the experiment.

scholarly journals Leveraging the Economic Potential of FCC’s Technologies and Processes

2020 ◽  
pp. 85-91
Author(s):  
Linn Kretzschmar
Keyword(s):  
Large Hadron Collider ◽  
Hadron Collider ◽  
New Physics ◽  
Accelerator Complex ◽  
The Core ◽  
Electron Positron ◽  
Circular Particle ◽  
The Standard Model ◽  
New Energy ◽  
The Universe

Abstract An international consortium of more than 150 organizations worldwide is studying the feasibility of various future particle colliders to expand our understanding of the inner workings of the Universe. At the core of the Future Circular Collider (FCC) study is the design of a 100 km long circular particle collider infrastructure that could extend CERN’s current accelerator complex with an integral research program that spans 70 years. The first step would be an intensity-frontier electron-positron collider allowing to study with precision the Higgs couplings with many of the Standard Model particles and search with high-precision for new physics while the ultimate goal is to build a proton collider with a c.m.s collision energy seven times larger than the Large Hadron Collider. Hosted in the same tunnel and profiting from the new infrastructure, FCC-hh would allow to explore a new energy regime where new physics may be at play.

scholarly journals Signatures of New Physics Versus the Ridge Phenomenon in Hadron–Hadron Collisions at the LHC

Physics ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. 84-91 ◽  
Author(s):  
Miguel-Angel Sanchis-Lozano ◽  
Edward K. Sarkisyan-Grinbaum
Keyword(s):  
Fourier Series ◽  
Large Hadron Collider ◽  
Fourier Analysis ◽  
Parton Shower ◽  
Hadron Collider ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Final State ◽  
Azimuthal Correlations ◽  
The Standard Model

In this paper, we consider the possibility that a new stage of matter stemming from hidden/dark sectors beyond the Standard Model, to be formed in p p collisions at the LHC (Large Hadron Collider), can significantly modify the correlations among final-state particles. In particular, two-particle azimuthal correlations are studied by means of a Fourier series sensitive to the near-side ridge effect while assuming that hidden/dark particles decay on top of the conventional parton shower. Then, new (fractional) harmonic terms should be included in the Fourier analysis of the azimuthal anisotropies, encoding the hypothetical new physics contribution and enabling its detection in a complementary way to other signatures.

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.

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