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Articles 1 - 17 of 17
Full-Text Articles in Physics
Search For Supersymmetry In Events With Four Or More Charged Leptons In 139 Fb−1 Of S√ = 13 Tev Pp Collisions With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama Sherif Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Search For Supersymmetry In Events With Four Or More Charged Leptons In 139 Fb−1 Of S√ = 13 Tev Pp Collisions With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama Sherif Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
A search for supersymmetry in events with four or more charged leptons (electrons, muons and tau-leptons) is presented. The analysis uses a data sample corresponding to 139 fb(-1) of proton-proton collisions delivered by the Large Hadron Collider at root s = 13 TeV and recorded by the ATLAS detector. Four-lepton signal regions with up to two hadronically decaying tau-leptons are designed to target several supersymmetric models, while a general five-lepton signal region targets any new physics phenomena leading to a final state with five charged leptons. Data yields are consistent with Standard Model expectations and results are used to set …
Search For Squarks And Gluinos In Final States With One Isolated Lepton, Jets, And Missing Transverse Momentum At S√=13 Tev With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Search For Squarks And Gluinos In Final States With One Isolated Lepton, Jets, And Missing Transverse Momentum At S√=13 Tev With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
The results of a search for gluino and squark pair production with the pairs decaying via the lightest charginos into a final state consisting of two W bosons, the lightest neutralinos ((chi) over tilde (0)(1)), and quarks, are presented: the signal is characterised by the presence of a single charged lepton (e(+/-) or mu(+/-)) from a W boson decay, jets, and missing transverse momentum. The analysis is performed using 139 fb(-1) of proton-proton collision data taken at a centre-of-mass energy root s = 13 delivered by the Large Hadron Collider and recorded by the ATLAS experiment. No statistically significant excess …
Search For Pair Production Of Third-Generation Scalar Leptoquarks Decaying Into A Top Quark And A Τ-Lepton In Pp Collisions At S√ = 13 Tev With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Dale K. Abhayasinghe, Syed H. Abidi, Ossama S. Abouzeid, Nicola L. Abraham, Halina Abramowicz
Search For Pair Production Of Third-Generation Scalar Leptoquarks Decaying Into A Top Quark And A Τ-Lepton In Pp Collisions At S√ = 13 Tev With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Dale K. Abhayasinghe, Syed H. Abidi, Ossama S. Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
A search for pair production of third-generation scalar leptoquarks decaying into a top quark and a tau-lepton is presented. The search is based on a dataset of pp collisions at root s = 13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb(-1). Events are selected if they have one light lepton (electron or muon) and at least one hadronically decaying tau-lepton, or at least two light leptons. In addition, two or more jets, at least one of which must be identified as containing b-hadrons, are required. …
Muon Reconstruction And Identification Efficiency In Atlas Using The Full Run 2 Pp Collision Data Set At S√=13 Tev, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Abouzeid, Nicola L. Abraham, Halina Abramowicz
Muon Reconstruction And Identification Efficiency In Atlas Using The Full Run 2 Pp Collision Data Set At S√=13 Tev, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
This article documents the muon reconstruction and identification efficiency obtained by the ATLAS experiment for 139 fb-1 of pp collision data at s=13 TeV collected between 2015 and 2018 during Run 2 of the LHC. The increased instantaneous luminosity delivered by the LHC over this period required a reoptimisation of the criteria for the identification of prompt muons. Improved and newly developed algorithms were deployed to preserve high muon identification efficiency with a low misidentification rate and good momentum resolution. The availability of large samples of Z -> mu mu and J/psi -> mu mu decays, and the minimisation of …
A Real Triplet-Singlet Extended Standard Model: Dark Matter And Collider Phenomenology, Nicole F. Bell, Matthew J. Dolan, Leon S. Friedrich, Michael J. Ramsey-Musolf, Raymond R. Volkas
A Real Triplet-Singlet Extended Standard Model: Dark Matter And Collider Phenomenology, Nicole F. Bell, Matthew J. Dolan, Leon S. Friedrich, Michael J. Ramsey-Musolf, Raymond R. Volkas
Physics Department Faculty Publication Series
We examine the collider and dark matter phenomenology of the Standard Model extended by a hypercharge-zero SU(2) triplet scalar and gauge singlet scalar. In particular, we study the scenario where the singlet and triplet are both charged under a single Z(2) symmetry. We find that such an extension is capable of generating the observed dark matter density, while also modifying the collider phenomenology such that the lower bound on the mass of the triplet is smaller than in minimal triplet scalar extensions to the Standard Model. A high triplet mass is in tension with the parameter space that leads to …
New Precise Spectroscopy Of The Hyperfine Structure In Muonium With A High-Intensity Pulsed Muon Beam, S. Kanda, Y. Fukao, Y. Ikedo, K. Ishida, M. Iwasaki, D. Kawall, N. Kawamura, K. M. Kojima, N. Kurosawa, Y. Matsuda
New Precise Spectroscopy Of The Hyperfine Structure In Muonium With A High-Intensity Pulsed Muon Beam, S. Kanda, Y. Fukao, Y. Ikedo, K. Ishida, M. Iwasaki, D. Kawall, N. Kawamura, K. M. Kojima, N. Kurosawa, Y. Matsuda
Physics Department Faculty Publication Series
A hydrogen-like atom consisting of a positive muon and an electron is known as muonium. It is a near-ideal two-body system for a precision test of bound-state theory and fundamental symmetries. The MuSEUM collaboration performed a new precision measurement of the muonium ground-state hyperfine structure at J-PARC using a high-intensity pulsed muon beam and a high-rate capable positron counter. The resonance of hyperfine transition was successfully observed at a near-zero magnetic field, and the muonium hyperfine structure interval of nu(HFS) = 4.463302(4) GHz was obtained with a relative precision of 0.9 ppm. The result was consistent with the previous ones …
Measurements Of W+W−+ ≥ 1 Jet Production Cross-Sections In Pp Collisions At S√ = 13 Tev With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Measurements Of W+W−+ ≥ 1 Jet Production Cross-Sections In Pp Collisions At S√ = 13 Tev With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
Fiducial and differential cross-section measurements of W+W- production in association with at least one hadronic jet are presented. These measurements are sensitive to the properties of electroweak-boson self-interactions and provide a test of perturbative quantum chromodynamics and the electroweak theory. The analysis is performed using proton-proton collision data collected at s = 13 TeV with the ATLAS experiment, corresponding to an integrated luminosity of 139 fb(-1). Events are selected with exactly one oppositely charged electron-muon pair and at least one hadronic jet with a transverse momentum of p(T)> 30 GeV and a pseudorapidity of |eta| < 4.5. After subtracting the background contributions and correcting for detector effects, the jet-inclusive W+W-+ >= 1 jet fiducial cross-section …
Measurements Of Differential Cross-Sections In Four-Lepton Events In 13 Tev Proton-Proton Collisions With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Measurements Of Differential Cross-Sections In Four-Lepton Events In 13 Tev Proton-Proton Collisions With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
Measurements of four-lepton differential and integrated fiducial cross-sections in events with two same-flavour, opposite-charge electron or muon pairs are presented. The data correspond to 139 fb(-1) of root s = 13 TeV proton-proton collisions, collected by the ATLAS detector during Run 2 of the Large Hadron Collider (2015-2018). The final state has contributions from a number of interesting Standard Model processes that dominate in different four-lepton invariant mass regions, including single Z boson production, Higgs boson production and on-shell ZZ production, with a complex mix of interference terms, and possible contributions from physics beyond the Standard Model. The differential cross-sections …
Determination Of The Parton Distribution Functions Of The Proton From Atlas Measurements Of Differential W± And Z Boson Production In Association With Jets, Atlas Collaboration, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed Haider Abidi, Ossama Sherif Alexander Abouzeid, Nicola L. Abraham
Determination Of The Parton Distribution Functions Of The Proton From Atlas Measurements Of Differential W± And Z Boson Production In Association With Jets, Atlas Collaboration, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed Haider Abidi, Ossama Sherif Alexander Abouzeid, Nicola L. Abraham
Physics Department Faculty Publication Series
This article presents a new set of proton parton distribution functions, AT-LASepWZVjet20, produced in an analysis at next-to-next-to-leading order in QCD. The new data sets considered are the measurements of W+ and W- boson and Z boson production in association with jets in pp collisions at root s = 8TeV performed by the ATLAS experiment at the LHC with integrated luminosities of 20.2 fb(-1) and 19.9 fb(-1), respectively. The analysis also considers the ATLAS measurements of differential W-+/- and Z boson production at root s = 7 TeV with an integrated luminosity of 4.6 fb(-1) and deep-inelastic-scattering data from e(+/-) …
Measurement Of Single Top-Quark Production In Association With A W Boson In The Single-Lepton Channel At S√=8tev With The Atlas Detector, Georges Aad, Braden Abbott, D. C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed Haider Abidi, Ossama Sherif Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Measurement Of Single Top-Quark Production In Association With A W Boson In The Single-Lepton Channel At S√=8tev With The Atlas Detector, Georges Aad, Braden Abbott, D. C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed Haider Abidi, Ossama Sherif Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
The production cross-section of a top quark in association with a W boson is measured using proton-proton collisions at root s = 8 TeV. The dataset corresponds to an integrated luminosity of 20.2 fb(-1,) and was collected in 2012 by the ATLAS detector at the Large Hadron Collider at CERN. The analysis is performed in the single-lepton channel. Events are selected by requiring one isolated lepton (electron or muon) and at least three jets. A neural network is trained to separate the tW signal from the dominant t (t) over bar background. The cross-section is extracted from a binned profile …
Measurements Of The Inclusive And Differential Production Cross Sections Of A Top-Quark-Antiquark Pair In Association With A Z Boson At S√=13 Tev With The Atlas Detector, Atlas Collaboration, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed Haider Abidi, Ossama Sherif Alexander Abouzeid, Nicola L. Abraham
Measurements Of The Inclusive And Differential Production Cross Sections Of A Top-Quark-Antiquark Pair In Association With A Z Boson At S√=13 Tev With The Atlas Detector, Atlas Collaboration, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed Haider Abidi, Ossama Sherif Alexander Abouzeid, Nicola L. Abraham
Physics Department Faculty Publication Series
Measurements of both the inclusive and differential production cross sections of a top-quark-antiquark pair in association with a Z boson (t (t) over barZ) are presented. The measurements are performed by targeting final states with three or four isolated leptons (electrons or muons) and are based on root s = 13 TeV proton-proton collision data with an integrated luminosity of 139 fb(-1), recorded from 2015 to 2018 with the ATLAS detector at the CERN Large Hadron Collider. The inclusive cross section is measured to be a sigma(t (t) over barZ)= 0.99 +/- 0.05 (stat.) +/- 0.08 (syst.) pb, in agreement …
Search For Doubly And Singly Charged Higgs Bosons Decaying Into Vector Bosons In Multi-Lepton Final States With The Atlas Detector Using Proton-Proton Collisions At √ S= 13 Tev, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Search For Doubly And Singly Charged Higgs Bosons Decaying Into Vector Bosons In Multi-Lepton Final States With The Atlas Detector Using Proton-Proton Collisions At √ S= 13 Tev, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
A search for charged Higgs bosons decaying into (WW +/-)-W-+/- or W(+/-)Z bosons is performed, involving experimental signatures with two leptons of the same charge, or three or four leptons with a variety of charge combinations, missing transverse momentum and jets. A data sample of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider between 2015 and 2018 is used. The data correspond to a total integrated luminosity of 139 fb(-1). The search is guided by a type-II seesaw model that extends the scalar sector of the Standard Model with …
Search For Charged Higgs Bosons Decaying Into A Top Quark And A Bottom Quark At √ S= 13 Tev With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Search For Charged Higgs Bosons Decaying Into A Top Quark And A Bottom Quark At √ S= 13 Tev With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
A search for charged Higgs bosons decaying into a top quark and a bottom quark is presented. The data analysed correspond to 139 fb(-1) of proton-proton collisions at root s = 13TeV, recorded with the ATLAS detector at the LHC. The production of a heavy charged Higgs boson in association with a top quark and a bottom quark, pp -> tbH(+) -> tbtb, is explored in the H+ mass range from 200 to 2000 GeV using final states with jets and one electron or muon. Events are categorised according to the multiplicity of jets and b-tagged jets, and multivariate analysis …
Resurgence Of The Qcd Adler Function, Alessio Maiezza, Juan Carlos Vasquez
Resurgence Of The Qcd Adler Function, Alessio Maiezza, Juan Carlos Vasquez
Physics Department Faculty Publication Series
We study the QCD Adler function in the energy region approximate to 0.7 - 2.5 GeV, in which the non-perturbative effects become dominant. Our analysis is a renormalon-based evaluation using transseries within the resurgence of the Renormalization-Group-Equation and does not require the Operator-Product-Expansion. (C) 2021 The Author(s). Published by Elsevier B.V.
Long-Lived Sterile Neutrinos At The Lhc In Effective Field Theory, Jordy De Vries, Herbert K. Dreiner, Julian Y. Günther, Zeren Simon Wang, Guanghui Zhou
Long-Lived Sterile Neutrinos At The Lhc In Effective Field Theory, Jordy De Vries, Herbert K. Dreiner, Julian Y. Günther, Zeren Simon Wang, Guanghui Zhou
Physics Department Faculty Publication Series
We study the prospects of a displaced-vertex search of sterile neutrinos at the Large Hadron Collider (LHC) in the framework of the neutrino-extended Standard Model Effective Field Theory (nu SMEFT). The production and decay of sterile neutrinos can proceed via the standard active-sterile neutrino mixing in the weak current, as well as through higher-dimensional operators arising from decoupled new physics. If sterile neutrinos are long-lived, their decay can lead to displaced vertices which can be reconstructed. We investigate the search sensitivities for the ATLAS/CMS detector, the future far-detector experiments: AL3X, ANUBIS, CODEX-b, FASER, MATHUSLA, and MoEDAL-MAPP, and at the proposed …
An Online Radon Monitor For Low-Background Detector Assembly Facilities, K. Pelczar, G. Zuzel, M. Wójcik, A. Pocar, An. Ianni
An Online Radon Monitor For Low-Background Detector Assembly Facilities, K. Pelczar, G. Zuzel, M. Wójcik, A. Pocar, An. Ianni
Physics Department Faculty Publication Series
Backgrounds from long-lived radon decay products are often problematic for low-energy neutrino and rareevent experiments. These isotopes, specifically 210Pb, 210Bi, and 210Po, easily plate out onto surfaces exposed to radonloaded air. The alpha emitter 210Po is particularly dangerous for detectors searching for weakly-interacting dark matter particles. Neutrons produced via (a, n) reactions in detector materials are, in some cases, a residual background that can limit the sensitivity of the experiment. An effective solution is to reduce the 222Rn activity in the air in contact with detector components during fabrication, assembly, commissioning, and operation. We present the design, construction, calibration procedures …
Everyday Particle Physics, Andrea Pocar
Everyday Particle Physics, Andrea Pocar
Science and Engineering Saturday Seminars
No abstract provided.