scholarly journals Single production of vector-like quarks: the effects of large width, interference and NLO corrections

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
Aldo Deandrea ◽  
Thomas Flacke ◽  
Benjamin Fuks ◽  
Luca Panizzi ◽  
Hua-Sheng Shao
Keyword(s):  
Invariant Mass Distribution ◽  
Finite Width ◽  
Interference Effects ◽  
Hadron Colliders ◽  
Exotic Particles ◽  
The Standard Model ◽  
Single Production ◽  
Quantitative Results ◽  
Large Width

Abstract We provide a comprehensive discussion, together with a complete setup for simulations, relevant for the production of a single vector-like quark at hadron colliders. Our predictions include finite width effects, signal-background interference effects and next-to-leading order QCD corrections. We explicitly apply the framework to study the single production of a vector-like quark T with charge 2/3, but the same procedure can be used to analyse the single production of vector-like quarks with charge −4/3, −1/3, 2/3 and 5/3, when the vector-like quark interacts with the Standard Model quarks and electroweak bosons. Moreover, this procedure can be straightforwardly extended to include additional interactions with exotic particles. We provide quantitative results for representative benchmark scenarios characterised by the T mass and width, and we determine the role of the interference terms for a range of masses and widths of phenomenological significance. We additionally describe in detail, both analytically and numerically, a striking feature in the invariant mass distribution appearing only in the T → th channel.

scholarly journals Model-independent approach for incorporating interference effects in collider searches for new resonances

2020 ◽  
Vol 80 (12) ◽  
Author(s):  
Stefano Frixione ◽  
Lydia Roos ◽  
Edmund Ting ◽  
Eleni Vryonidou ◽  
Martin White ◽  
...  
Keyword(s):  
Standard Model ◽  
Direct Evidence ◽  
Invariant Mass Distribution ◽  
Hadron Collider ◽  
Large Mass ◽  
Beyond The Standard Model ◽  
Interference Effects ◽  
Scalar Resonance ◽  
The Standard Model ◽  
Model Independent

AbstractThe presence of large-mass resonances in the data collected at the Large Hadron Collider would provide direct evidence of physics beyond the Standard Model. A key challenge in current resonance searches at the LHC is the modelling of signal–background interference effects, which can severely distort the shape of the reconstructed invariant mass distribution relative to the case where there is no interference. Such effects are strongly dependent on the beyond the Standard Model theory that must be considered as unknown if one aims to minimise any theoretical bias on the search results. In this paper, we describe a procedure which employs a physically-motivated, model-independent template functional form that can be used to model interference effects, both for the characterisation of positive discoveries, and in the presentation of null results. We illustrate the approach with the example of a scalar resonance decaying into a pair of photons.

scholarly journals Testing the Vector Condensate Model of Electroweak Interactions at High Energy Hadron Colliders

1997 ◽  
Vol 12 (32) ◽  
pp. 2455-2459 ◽  
Author(s):  
G. Cynolter ◽  
E. Lendvai ◽  
G. Pócsik
Keyword(s):  
Vector Fields ◽  
Particle Production ◽  
Inclusive Cross Section ◽  
Higgs Doublet ◽  
High Energy ◽  
Hadron Colliders ◽  
The Standard Model ◽  
Neutral Vector ◽  
Energy Hadron

In the vector condensate model a doublet of vector fields plays the role of the Higgs doublet of the standard model and the gauge symmetry is broken dynamically. This results in a theory surviving the test of radiative corrections provided that the new charged and neutral vector particles B+,0 have masses of at least several hundred GeVs. In this note we show that while at the Tevatron the heavy B-particle production is too low, at LHC the yield is large and, for instance, the inclusive cross-section of B+B- pairs is 33.0 (8.5) fb at [Formula: see text] and mB=400 (500) GeV.

scholarly journals Role of Bc+→Bs,d(*)ℓ¯νℓ in the Standard Model and in the search for BSM signals

2021 ◽  
Vol 103 (7) ◽  
Author(s):  
Pietro Colangelo ◽  
Fulvia De Fazio ◽  
Francesco Loparco
Keyword(s):  
Standard Model ◽  
The Standard Model

scholarly journals K → μ+μ− as a clean probe of short-distance physics

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Avital Dery ◽  
Mitrajyoti Ghosh ◽  
Yuval Grossman ◽  
Stefan Schacht
Keyword(s):  
Matrix Element ◽  
Standard Model ◽  
Short Distance ◽  
Time Dependent ◽  
Final States ◽  
Interference Effects ◽  
Fundamental Theory ◽  
Long Distance ◽  
Ckm Matrix ◽  
The Standard Model

Abstract The K → μ+μ− decay is often considered to be uninformative of fundamental theory parameters since the decay is polluted by long-distance hadronic effects. We demonstrate that, using very mild assumptions and utilizing time-dependent interference effects, ℬ(KS → μ+μ−)ℓ=0 can be experimentally determined without the need to separate the ℓ = 0 and ℓ = 1 final states. This quantity is very clean theoretically and can be used to test the Standard Model. In particular, it can be used to extract the CKM matrix element combination $$ \mid {V}_{ts}{V}_{td}\sin \left(\beta +{\beta}_s\right)\mid \approx \mid {A}^2{\lambda}^5\overline{\eta}\mid $$ ∣ V ts V td sin β + β s ∣ ≈ ∣ A 2 λ 5 η ¯ ∣ with hadronic uncertainties below 1%.

scholarly journals Few Body Effects in the Electron and Positron Impact Ionization of Atoms

Atoms ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 33
Author(s):  
R.I. Campeanu ◽  
Colm T. Whelan
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Differential Cross ◽  
Impact Ionization ◽  
Inert Gas ◽  
Interference Effects ◽  
Positron Impact ◽  
Competing Interactions ◽  
Energy Sharing

Triple differential cross sections (TDCS) are presented for the electron and positron impact ionization of inert gas atoms in a range of energy sharing geometries where a number of significant few body effects compete to define the shape of the TDCS. Using both positrons and electrons as projectiles has opened up the possibility of performing complementary studies which could effectively isolate competing interactions that cannot be separately detected in an experiment with a single projectile. Results will be presented in kinematics where the electron impact ionization appears to be well understood and using the same kinematics positron cross sections will be presented. The kinematics are then varied in order to focus on the role of distortion, post collision interaction (pci), and interference effects.

scholarly journals Power, the Pacific Islands, and the Prestige Press: A Case Study of How Climate Reporting is Influenced by UN Framework Convention on Climate Change Summits

2021 ◽  
pp. 194016122110180
Author(s):  
Meghan M. Shea ◽  
James Painter ◽  
Shannon Osaka
Keyword(s):  
Climate Change ◽  
Media Coverage ◽  
Pacific Islands ◽  
Structured Interviews ◽  
The Pacific ◽  
Emotional Appeals ◽  
Issue Attention ◽  
Quantitative Results

While studies have investigated UN Framework Convention on Climate Change (UNFCCC) meetings as drivers of climate change reporting as well as the geopolitical role of Pacific Islands in these international forums, little research examines the intersection: how media coverage of Pacific Islands and climate change (PICC) may be influenced by, or may influence, UNFCCC meetings. We analyze two decades of reporting on PICC in American, British, and Australian newspapers—looking at both volume and content of coverage—and expand the quantitative results with semi-structured interviews with journalists and Pacific stakeholders. Issue attention on PICC increases and the content changes significantly in the periods around UNFCCC meetings, with shifts from language about vulnerability outside of UNFCCC periods to language about agency and solutions. We explore the implications of these differences in coverage for both agenda setting and the amplification of emotional appeals in UNFCCC contexts.

Role of current oscillations in ac-dc interference effects inNbSe3

1984 ◽  
Vol 30 (4) ◽  
pp. 2279-2281 ◽  
Author(s):  
R. P. Hall ◽  
A. Zettl
Keyword(s):  
Interference Effects ◽  
Current Oscillations

Defying the Monolingual Stage / Bousculer la scène unilingue

2017 ◽  
Vol 38 (2) ◽  
pp. 143-147
Author(s):  
Art Babayants ◽  
Nicole Nolette
Keyword(s):  
Power Distribution ◽  
Minority Languages ◽  
Race Perception ◽  
Canadian Theatre ◽  
Theatre Companies ◽  
Single Production ◽  
The Aesthetic ◽  
Artistic Director ◽  
Multiple Languages

In early April 2017, Toronto’s Modern Times Theatre invited a diverse group of artists, scholars, and critics to join a discussion about diversity in Canadian theatre practices. One of the panels moderated by the Artistic Director of Cahoots Theatre, Marjorie Chan, focused on languages and accents on stage. Each of the discussants proposed their own set of questions: How can minority languages be represented on stage? Should they be translated? What is the role of subtitles and what kind of sub/surtitles should be used? Who is allowed to use which language? For instance, can hearing actors use ASL on stage or should they let deaf actors perform roles that require ASL? Should immigrant actors who learned English as adults be expected to speak English without a marked accent? Why do Canadian audiences and critics find it difficult to accept “non-native sounding” actors performing characters that are expected to have an “unmarked” accent? Why are they expected to have an “unmarked accent”? While the discussants did not see eye to eye on many of these issues, it was clear that they all shared the view that professional Canadian theatre companies and Canadian theatre schools are currently doing a rather poor job at fostering linguistic and phonetic diversity on stage. It also became clear that the question of using multiple languages on stage is profoundly intertwined with the question of accents, dialects, the issues of accent/language perception, as well as race and race perception, the problem of power distribution, and, last but not least, the aesthetic choices of every single production.

Role of gravity in particle physics: A unified approach

2020 ◽  
Vol 29 (11) ◽  
pp. 2041012
Author(s):  
Pedro D. Alvarez ◽  
Mauricio Valenzuela ◽  
Jorge Zanelli
Keyword(s):  
General Relativity ◽  
Standard Model ◽  
Particle Physics ◽  
Laws Of Nature ◽  
Lorentz Transformations ◽  
Unified Approach ◽  
The Standard Model ◽  
Matter Fields

General Relativity (GR) and the Standard Model (SM) of particle physics are two enormously successful frameworks for our understanding the fundamental laws of nature. However, these theoretical schemes are widely disconnected, logically independent and unrelated in scope. Yet, GR and SM at some point must intersect, producing claims about phenomena that should be reconciled. Be it as it may, both schemes share a common basic ground: symmetry under local Lorentz transformations. Here, we will focus on the consequences of assuming this feature from the beginning to combine geometry, matter fields and gauge interactions. We give a rough description of how this could be instrumental for the construction of a unified scheme of gravitation and particle physics.

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