scholarly journals U(3)C×Sp(1)L×U(1)L×U(1)R

2012 ◽  
Vol 2012 ◽  
pp. 1-43 ◽  
Author(s):  
Luis Alfredo Anchordoqui
Keyword(s):  
Gauge Theory ◽  
Cross Sections ◽  
Hadron Collider ◽  
Baryon Number ◽  
New Physics ◽  
Mass Scale ◽  
Gauge Bosons ◽  
Open Strings ◽  
Fundamental String ◽  
Discovery Potential

We outline the basic setting of theU(3)C×Sp(1)L×U(1)L×U(1)Rgauge theory and review the associated phenomenological aspects related to experimental searches for new physics at hadron colliders. In this construction, there are two massiveZ′-gauge bosons, which can be naturally associated with baryon numberB  and  B-L  (Lbeing lepton number). We discuss the potential signals which may be accessible at the Tevatron and at the Large Hadron Collider (LHC). In particular, we provide the relevant cross sections for the production ofZ′-gauge bosons in the TeV region, leading to predictions that are within reach of the present or the next LHC run. After that we direct attention to embedding the gauge theory into the framework of string theory. We consider extensions of the standard model based on open strings ending on D-branes, with gauge bosons due to strings attached to stacks of D-branes and chiral matter due to strings stretching between intersecting D-branes. Assuming that the fundamental string mass scale is in the TeV range and the theory is weakly coupled, we explore the LHC discovery potential for Regge excitations.

ORIENTIFOLD STRING VACUA AND STRINGS AT THE LHC

2011 ◽  
Vol 26 (27n28) ◽  
pp. 4687-4701
Author(s):  
DIETER LÜST
Keyword(s):  
Large Hadron Collider ◽  
Standard Model ◽  
Hadron Collider ◽  
Mass Scale ◽  
Gauge Bosons ◽  
Model Based ◽  
Open Strings ◽  
Fundamental String ◽  
Weakly Coupled ◽  
The Standard Model

We consider extensions of the Standard Model based on open strings ending on D-branes, with gauge bosons due to strings attached to stacks of D-branes and chiral matter due to strings stretching between intersecting D-branes. Assuming that the fundamental string mass scale is in the TeV range and the theory is weakly coupled, we discuss possible signals of string physics at the Large Hadron Collider (LHC).

scholarly journals STRING PHENOMENOLOGY AT THE LHC

2009 ◽  
Vol 24 (31) ◽  
pp. 2481-2490 ◽  
Author(s):  
LUIS A. ANCHORDOQUI ◽  
HAIM GOLDBERG ◽  
DIETER LÜST ◽  
STEPHAN STIEBERGER ◽  
TOMASZ R. TAYLOR
Keyword(s):  
Large Hadron Collider ◽  
Standard Model ◽  
Hadron Collider ◽  
Mass Scale ◽  
Gauge Bosons ◽  
String Phenomenology ◽  
Open Strings ◽  
Fundamental String ◽  
Weakly Coupled ◽  
The Standard Model

We consider extensions of the standard model based on open strings ending on D-branes, with gauge bosons due to strings attached to stacks of D-branes and chiral matter due to strings stretching between intersecting D-branes. Assuming that the fundamental string mass scale is in the TeV range and the theory is weakly coupled, we review possible signals of string physics at the Large Hadron Collider.

scholarly journals Charged lepton flavor violation at the EIC

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Vincenzo Cirigliano ◽  
Kaori Fuyuto ◽  
Christopher Lee ◽  
Emanuele Mereghetti ◽  
Bin Yan
Keyword(s):  
Cross Sections ◽  
Charged Lepton ◽  
Hadron Collider ◽  
Effective Field ◽  
Background Suppression ◽  
Lepton Flavor Violation ◽  
Final State ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Discovery Potential

Abstract We present a comprehensive analysis of the potential sensitivity of the Electron-Ion Collider (EIC) to charged lepton flavor violation (CLFV) in the channel ep→τX, within the model-independent framework of the Standard Model Effective Field Theory (SMEFT). We compute the relevant cross sections to leading order in QCD and electroweak corrections and perform simulations of signal and SM background events in various τ decay channels, suggesting simple cuts to enhance the associated estimated efficiencies. To assess the discovery potential of the EIC in τ-e transitions, we study the sensitivity of other probes of this physics across a broad range of energy scales, from pp→eτX at the Large Hadron Collider to decays of B mesons and τ leptons, such as τ→eγ, τ→eℓ+ℓ−, and crucially the hadronic modes τ→eY with Y∈π, K, ππ, Kπ, …. We find that electroweak dipole and four-fermion semi-leptonic operators involving light quarks are already strongly constrained by τ decays, while operators involving the c and b quarks present more promising discovery potential for the EIC. An analysis of three models of leptoquarks confirms the expectations based on the SMEFT results. We also identify future directions needed to maximize the reach of the EIC in CLFV searches: these include an optimization of the τ tagger in hadronic channels, an exploration of background suppression through tagging b and c jets in the final state, and a global fit by turning on all SMEFT couplings, which will likely reveal new discovery windows for the EIC.

scholarly journals NEW PHYSICS DISCOVERY POTENTIAL IN FUTURE EXPERIMENTS

1998 ◽  
Vol 13 (40) ◽  
pp. 3235-3249 ◽  
Author(s):  
S. I. BITYUKOV ◽  
N. V. KRASNIKOV
Keyword(s):  
Cross Sections ◽  
High Energy Physics ◽  
High Energy ◽  
New Physics ◽  
Physics Simulation ◽  
Discovery Potential ◽  
Proper Definition ◽  
Definition Of ◽  
Physics Experiments ◽  
Energy Physics

We propose a method to estimate the probability of new physics discovery in future high energy physics experiments. Physics simulation gives both the average numbers <Nb> of background and <Ns> of signal events. We find that the proper definition of the significance for <Nb>, <Ns> ≫ 1 is [Formula: see text] in comparison with often used significances: [Formula: see text] and [Formula: see text]. We propose a method of taking into account the systematical errors related to nonexact knowledge of background and signal cross-sections. An account of such systematics is essential in the search for supersymmetry at LHC. We also propose a method for estimating exclusion limits on new physics in future experiments.

scholarly journals Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
G. Aad ◽  
◽  
B. Abbott ◽  
D. C. Abbott ◽  
A. Abed Abud ◽  
...  
Keyword(s):  
Contact Interaction ◽  
Hadron Collider ◽  
Mass Range ◽  
New Physics ◽  
Mass Region ◽  
Mass Scale ◽  
Energy Scale ◽  
High Mass ◽  
Final States ◽  
Dilepton Final States

Abstract A search for new physics with non-resonant signals in dielectron and dimuon final states in the mass range above 2 TeV is presented. This is the first search for non-resonant signals in dilepton final states at the LHC to use a background estimate from the data. The data, corresponding to an integrated luminosity of 139 fb−1, were recorded by the ATLAS experiment in proton-proton collisions at a center-of-mass energy of $$ \sqrt{s} $$ s = 13 TeV during Run 2 of the Large Hadron Collider. The benchmark signal signature is a two-quark and two-lepton contact interaction, which would enhance the dilepton event rate at the TeV mass scale. To model the contribution from background processes a functional form is fit to the dilepton invariant-mass spectra in data in a mass region below the region of interest. It is then extrapolated to a high-mass signal region to obtain the expected background there. No significant deviation from the expected background is observed in the data. Upper limits at 95% CL on the number of events and the visible cross-section times branching fraction for processes involving new physics are provided. Observed (expected) 95% CL lower limits on the contact interaction energy scale reach 35.8 (37.6) TeV.

scholarly journals DISCOVERY AND IDENTIFICATION OF W′ BOSONS AT e+e- COLLIDERS

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 879-881
Author(s):  
STEPHEN GODFREY ◽  
PAT KALYNIAK ◽  
BASIM KAMAL ◽  
M. A. DONCHESKI ◽  
ARND LEIKE
Keyword(s):  
Large Hadron Collider ◽  
Hadron Collider ◽  
W Bosons ◽  
Gauge Bosons ◽  
Discovery Potential

We report on studies of the sensitivity to extra gauge bosons of the reactions [Formula: see text] and eγ→νq+X to extract discovery limits for W′'s. The discovery potential for a W′ is, for some models, comparable to that of the LHC. These processes may be also useful for determining W′ and Z′ couplings to fermions which would complement measurements made at the Large Hadron Collider.

scholarly journals Infrared structure of SU(N) × U(1) gauge theory to three loops

2020 ◽  
Vol 2020 (8) ◽  
Author(s):  
A.H. Ajjath ◽  
Pooja Mukherjee ◽  
V. Ravindran
Keyword(s):  
Perturbation Theory ◽  
Gauge Theory ◽  
Cross Sections ◽  
Hadron Collider ◽  
Form Factors ◽  
Distribution Functions ◽  
Third Order ◽  
Threshold Limit ◽  
Anomalous Dimensions ◽  
Renormalisation Constant

Abstract We study the infrared (IR) structure of SU(N ) × U(1) (QCD × QED) gauge theory with nf quarks and nl leptons within the framework of perturbation theory. In particular, we unravel the IR structure of the form factors and inclusive real emission cross sections that contribute to inclusive production of color neutral states, such as a pair of leptons or single W/Z in Drell-Yan processes and a Higgs boson in bottom quark annihilation, in Large Hadron Collider (LHC) in the threshold limit. Explicit computation of the relevant form factors to third order and the use of Sudakov’s K + G equation in SU(N ) × U(1) gauge theory demonstrate the universality of the cusp anomalous dimensions (AI, I = q, b). The abelianization rules that relate AI of SU(N ) with those from U(1) and SU(N) × U(1) can be used to predict the soft distribution that results from the soft gluon emission subprocesses in the threshold limit. Using the latter and the third order form factors, we can obtain the collinear anomalous dimensions (BI) and the renormalisation constant Zb to third order in perturbation theory. The form factors, the process independent soft distribution functions can be used to predict fixed and resummed inclusive cross sections to third order in couplings and in leading logarithmic approximation respectively.

scholarly journals Probing Anomalous Quartic Interactions at the LHC with proton tagging

2018 ◽  
Vol 172 ◽  
pp. 06002
Author(s):  
Cristian Baldenegro
Keyword(s):  
Large Hadron Collider ◽  
Standard Model ◽  
Particle Physics ◽  
Hadron Collider ◽  
Center Of Mass ◽  
Gauge Coupling ◽  
New Physics ◽  
Interaction Point ◽  
The Standard Model ◽  
Discovery Potential

One of the main goals of the Large Hadron Collider is to find signatures of physics Beyond the Standard Model of particle physics. One way to do this is by studying with high precision the interactions of the Standard Model. In this talk, we address the discovery potential of New Physics in the exclusive channel pp → p X p which relies on the general purpose detectors at the Large Hadron Collider and their respective forward proton detector stations, located at about ~ 210 m w.r.t. the interaction point. These reactions are highly sensitive to quartic electroweak gauge interactions. As a proof of concept, we discuss the exclusive diphoton production at high diphoton invariant mass. We quote sensitivities on the anomalous γγγγ coupling for an integrated luminosity of 300 fb1 at the center-of-mass energy of 14 TeV.We also discuss the discovery potential of 3γZ anomalous quartic gauge coupling by measuring the pp → p(γγ → Zγ)p reaction.

scholarly journals Baryonic Higgs and dark matter

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Pavel Fileviez Pérez ◽  
Clara Murgui ◽  
Alexis D. Plascencia
Keyword(s):  
Dark Matter ◽  
Gauge Theory ◽  
Gauge Theories ◽  
Direct Detection ◽  
Hadron Collider ◽  
Branching Ratio ◽  
Baryon Number ◽  
Matter Density ◽  
Dark Matter Candidate ◽  
Anomaly Cancellation

Abstract We discuss the correlation between dark matter and Higgs decays in gauge theories where the dark matter is predicted from anomaly cancellation. In these theories, the Higgs responsible for the breaking of the gauge symmetry generates the mass for the dark matter candidate. We investigate the Higgs decays in the minimal gauge theory for Baryon number. After imposing the dark matter density and direct detection constraints, we find that the new Higgs can have a large branching ratio into two photons or into dark matter. Furthermore, we discuss the production channels and the unique signatures at the Large Hadron Collider.

scholarly journals Global QCD Analysis and Hadron Collider Physics

2006 ◽  
Vol 21 (04) ◽  
pp. 620-628
Author(s):  
Wu-Ki Tung
Keyword(s):  
Cross Sections ◽  
Top Quark ◽  
Global Analysis ◽  
Hadron Collider ◽  
New Physics ◽  
Distribution Functions ◽  
Current Status ◽  
Collider Physics ◽  
Parton Distribution Functions ◽  
Qcd Analysis

The role of global QCD analysis of parton distribution functions (PDFs) in collider physics at the Tevatron and LHC is surveyed. Current status of PDF analyses are reviewed, emphasizing the uncertainties and the open issues. The stability of NLO QCD global analysis and its prediction on "standard candle" W/Z cross sections at hadron colliders are discussed. The importance of the precise measurement of various W/Z cross sections at the Tevatron in advancing our knowledge of PDFs, hence in enhancing the capabilities of making significant progress in W mass and top quark parameter measurements, as well as the discovery potentials of Higgs and New Physics at the Tevatron and LHC, is emphasized.

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