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Articles 1 - 30 of 39
Full-Text Articles in Elementary Particles and Fields and String Theory
Search For Exotic Higgs Boson Decay To Multiple B-Quarks With The Atlas Detector At Lhc Using Machine Learning Methods, Yuan-Tang Chou
Search For Exotic Higgs Boson Decay To Multiple B-Quarks With The Atlas Detector At Lhc Using Machine Learning Methods, Yuan-Tang Chou
Doctoral Dissertations
The discovery of the Higgs boson has opened up new possibilities for investigating physics beyond the Standard Model (SM). New particles may interact with the SM through the Higgs boson, and deviations from SM predictions can indicate the presence of new physics. This dissertation focuses on the search for exotic Higgs decay, $H\rightarrow aa \rightarrow (b\bbar)(b\bbar)$ where a is a new scalar boson and focuses on the case where the Higgs boson is produced in association with a Z boson. The data were collected by the ATLAS detector at the Large Hadron Collider at center-of-mass energy $\sqrt{s} =~13~\TeV$ from 2015 …
Tev-Scale Lepton Number Violation: 0Νββ Decay, The Origin Of Matter, And Energy Frontier Probes, Sebastian Urrutia Quiroga
Tev-Scale Lepton Number Violation: 0Νββ Decay, The Origin Of Matter, And Energy Frontier Probes, Sebastian Urrutia Quiroga
Doctoral Dissertations
Lepton number violation (LNV) offers promising theoretical pathways to several unresolved problems in particle and nuclear physics and unveils a diverse range of phenomenology across different energy scales. TeV-scale LNV is especially relevant for both its experimental accessibility and its broad-ranging impact, making it a key area of interest for both theoretical and experimental physicists. In this thesis, we explore three distinct scenarios within the LNV research landscape. Our first analysis concerns the implications of TeV-scale LNV effects in thermal leptogenesis and its complementary sensitivity in neutrinoless double beta (0νββ) decay and collider experiments. We employed a simplified model to …
Quantum Field Theory In Nontrivial Backgrounds And Particle Production, Yue Qiu
Quantum Field Theory In Nontrivial Backgrounds And Particle Production, Yue Qiu
Doctoral Dissertations
Production of particles from nontrivial backgrounds is an important phenomenon in quantum field theory. In this thesis, we review some useful formulae of Bogoliubov formalism and explain how to derive the spectra of particle production. We then apply the formalism to study several scenarios. We first study the Schwinger effect in compact $(1+1)$ dimensions spacetime. Using the in-in formalism, we compute the correction to the electric field from the creation of charged particles both when the spatial dimension is compact and when it is non-compact. Secondly, we investigate the thermodynamic properties of the Schwarzschild-de Sitter (SdS) system. We explore particle …
Measurement Of The Fiducial Cross Section For Vector-Boson-Fusion Production Of The Higgs Boson In The Ww Decay Channel With The Atlas Detector, Guy Rosin
Doctoral Dissertations
This doctoral thesis presents a measurement of the fiducial and differential cross section of vector boson fusion produced Higgs boson.The measurement is taken in the H → WW∗ → lνlν channel with 139 fb−1 of data. Proton-proton collisions from the Large Hadron Collider at √s = 13 TeV were recorded by the ATLAS detector. New analysis techniques using boosted decision trees with a statistical fit are introduced to accurately estimate backgrounds in the signal region. The fiducial cross section is measured to be 1.7 ± 0.42fb. The differential cross section was measured for 13 kinematic variables. No significant deviations …
Calibration Of The Lux-Zeplin Dual-Phase Xenon Time Projection Chamber With Internally Injected Radioisotopes, Christopher D. Nedlik
Calibration Of The Lux-Zeplin Dual-Phase Xenon Time Projection Chamber With Internally Injected Radioisotopes, Christopher D. Nedlik
Doctoral Dissertations
Self-shielding in ton-scale liquid xenon (LXe) detectors presents a unique challenge for calibrating detector response to interactions in the detector's innermost volume. Calibration radioisotopes must be injected directly into the LXe to reach the central volume, where they must either decay away with a short half life or be purified out. We present an overview of, and results from, the prototype source injection system (SIS) developed at the University of Massachusetts Amherst for the LUX-ZEPLIN experiment (LZ). The SIS is designed to refine techniques for the injection and removal of precise activities of various calibration radioisotopes that are useful in …
General Covariance With Stacks And The Batalin-Vilkovisky Formalism, Filip Dul
General Covariance With Stacks And The Batalin-Vilkovisky Formalism, Filip Dul
Doctoral Dissertations
In this thesis we develop a formulation of general covariance, an essential property for many field theories on curved spacetimes, using the language of stacks and the Batalin-Vilkovisky formalism. We survey the theory of stacks, both from a global and formal perspective, and consider the key example in our work: the moduli stack of metrics modulo diffeomorphism. This is then coupled to the Batalin-Vilkovisky formalism–a formulation of field theory motivated by developments in derived geometry–to describe the associated equivariant observables of a theory and to recover and generalize results regarding current conservation.
A Search For Exotic Higgs Decays Or: How I Learned To Stop Worrying And Love Long-Lived Particles, Jackson Burzynski
A Search For Exotic Higgs Decays Or: How I Learned To Stop Worrying And Love Long-Lived Particles, Jackson Burzynski
Doctoral Dissertations
A novel search for exotic decays of the Higgs boson to pairs of long-lived neutral particles, each decaying to a bottom quark pair, is performed using 139 fb-1 of sqrt{s} = 13 TeV proton-proton collision data collected with the ATLAS detector at the LHC. Events consistent with the production of a Higgs boson in association with a leptonically-decaying Z boson are analyzed. Long-lived particle (LLP) decays are reconstructed from inner detector tracks as displaced vertices with high mass and track multiplicity relative to Standard Model processes. The analysis selection requires the presence of at least two displaced vertices, effectively …
Search For Resonant Pair Production Of Higgs Bosons In The Four B-Quark Final State With The Atlas Detector, Dale Abbott
Search For Resonant Pair Production Of Higgs Bosons In The Four B-Quark Final State With The Atlas Detector, Dale Abbott
Doctoral Dissertations
A search for heavy resonances decaying to Higgs boson pairs in the $b\overline{b}b\overline{b}$ final state with 139 $fb^{-1}$ of LHC proton-proton (pp) collision data collected at $\sqrt{s} = 13$ TeV obtained by the ATLAS detector during the 2015-2018 time period. Two benchmark signals are studied, both of which decay into a Higgs boson pair: a spin-2 Kaluza-Klein Graviton and a scalar resonance. This thesis studies high transverse momentum (boosted) resonances, which range from 900-5000 GeV. No statistically significant excesses are observed and the results are found to be compatible with the Standard Model. Upper limits are set on the production …
A Search For New Resonances Decaying Into A Weak Vector Boson And A Higgs Boson In Hadronic Final States With The Atlas Detector At The Large Hadron Collider, Zachary Alden Meadows
A Search For New Resonances Decaying Into A Weak Vector Boson And A Higgs Boson In Hadronic Final States With The Atlas Detector At The Large Hadron Collider, Zachary Alden Meadows
Doctoral Dissertations
A search for heavy resonances decaying to a $W$ or $Z$ boson and a Higgs boson in the final state is described. The search uses $139\ \mathrm{fb}^{-1}$ of proton-proton collision data at $\sqrt{s} = 13$ TeV collected by the ATLAS detector at the CERN Large Hadron Collider from 2015 to 2018. The results are presented in terms of constraints on a simplified model with a heavy vector triplet. Upper limits are set on the production cross-section times branching fraction for resonances decaying into a W/Z boson and a Higgs boson in the mass range between 1.2 to 5 TeV.
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 …
Searching For New Physics At Colliders And From Precision Measurements, Yong Du
Searching For New Physics At Colliders And From Precision Measurements, Yong Du
Doctoral Dissertations
Beyond the great triumph of the Standard Model of particle physics, several fundamental questions remain unknown with the framework of the Standard Model. Among them are the non-zero neutrino masses, the dark matter and the baryon asymmetry of the Universe. Answers to these questions require new physics beyond the Standard Model and searching for the new physics beyond the SM has been a major task for modern particle physicists. The signal of this new physics can be searched through colliders, low- and high-energy precision measurements, as well as precision cosmological observation. Here I present my work in searching for the …
Search For Displaced Hadronic Vertices In The Atlas Inner Detector And Muon Spectrometer In P-P Collisions At √S = 13 Tev At The Lhc, Margaret S. Lutz
Search For Displaced Hadronic Vertices In The Atlas Inner Detector And Muon Spectrometer In P-P Collisions At √S = 13 Tev At The Lhc, Margaret S. Lutz
Doctoral Dissertations
A search is performed for long-lived neutral particles using 33 fb−1 of 13 TeV proton-proton collision data produced by the LHC and collected by the ATLAS detector during 2016. This search focuses on the topology in which pairs of displaced hadronic jets are produced, with one in the inner detector and the other in the muon spectrometer. Special techniques are used to reconstruct the displaced decays. One event is found passing the full signal selection, which is consistent with the back- ground estimation. Limits are set at a 95% upper confidence level on the BR × σ for a SM …
Collider Tests Of Fundamental Symmetries And Neutrino Properties, Haolin Li
Collider Tests Of Fundamental Symmetries And Neutrino Properties, Haolin Li
Doctoral Dissertations
The CP parity of the Higgs boson and the details of the electroweak symmetry breaking are the two crucial ingredients to understand the matter-antimatter asymmetry in our universe. Electroweak baryogenesis is an intriguing solution to the puzzle of this unexplained observed asymmetry because of its testability at present and near future collider experiments. The possibilities of testing CP phase in the Two-Higgs-Doublets Models (2HDMs) and the generation of a strong first-order electroweak phase transition (SFOEWPT) in the real singlet model at the future high luminosity LHC are studied. In addition to the specific extensions to the Standard Model (SM), I …
Search For Long-Lived, Massive Particles Decaying Into Dimuon Vertices In Pp Collisions At 13 Tev With The Atlas Detector At The Lhc, Nathan Bernard
Search For Long-Lived, Massive Particles Decaying Into Dimuon Vertices In Pp Collisions At 13 Tev With The Atlas Detector At The Lhc, Nathan Bernard
Doctoral Dissertations
A search for long-lived, massive particles decaying into dimuon pairs, in 32.9 fb-1 of data analyzed from the ATLAS detector is presented. Two signal models are considered: GGM SUSY, where the long lived particle mass is between 300-1000 GeV, and the dark photon model, where the ZD mass is between 20-60 GeV. An excess over the predicted background is observed in the GGM channel, however the angular/kinematic distributions of the excess vertices are consistent with a detec- tor/conditions related issue. A modified selection is used for the GGM channel which increases the signal sensitivity. 95% confidence level (CL) …
Production Of Cosmological Observables During The Inflationary Epoch, Cody Goolsby-Cole
Production Of Cosmological Observables During The Inflationary Epoch, Cody Goolsby-Cole
Doctoral Dissertations
This dissertation proposal explores the production of present day cosmological observables which might have been produced during the inflationary era. The first observable is the current net electric charge of our observable universe produced by charge fluctuations during inflation. Next, we examine the possibility of a signal in the primordial gravitational wave power spectrum produced by a scalar field with a time dependent mass. Finally, we examine primordial magnetic fields produced during inflation through the Ratra model coupling with the Schwinger effect.