scholarly journals Higgs decay mediated by top-quark with flavor-changing neutral scalar interactions

2017 ◽  
Vol 912 ◽  
pp. 012032
Author(s):  
J. A. Orduz-Ducuara
Keyword(s):  
Top Quark ◽  
Flavor Changing ◽  
Higgs Decay ◽  
Neutral Scalar

scholarly journals SCALAR DARK MATTER EFFECTS IN HIGGS AND TOP QUARK DECAYS

2007 ◽  
Vol 22 (25n28) ◽  
pp. 2121-2129 ◽  
Author(s):  
XIAO-GANG HE ◽  
HO-CHIN TSAI ◽  
TONG LI ◽  
XUE-QIAN LI
Keyword(s):  
Dark Matter ◽  
Top Quark ◽  
Neutral Current ◽  
Higgs Doublet ◽  
Tree Level ◽  
Flavor Changing ◽  
Higgs Decay ◽  
Dark Matter Relic Density ◽  
Flavor Changing Neutral Current ◽  
Two Higgs Doublet Model

We study possible observational effects of scalar dark matter, the darkon D, in Higgs h and top quark t decay processes, h → DD and t → cDD in the minimal Standard Model (SM) and its two Higgs doublet model (THDM) extension supplemented with a SM singlet darkon scalar field D. We find that the darkon D can have a mass in the range of sub-GeV to several tens of GeV, interesting for LHC and ILC colliders, to produce the required dark matter relic density. In the SM with a darkon, t → cDD only occurs at loop level giving a very small rate, while the rate for Higgs decay h → DD can be large. In THDM III with a darkon, where tree level flavor changing neutral current (FCNC) interaction exists, a sizable rate for t → cDD is also possible.

scholarly journals tt̄H Coupling Measurement with the ATLAS Detector at the LHC

2018 ◽  
Vol 182 ◽  
pp. 02052
Author(s):  
Asma Hadef
Keyword(s):  
Higgs Boson ◽  
Cross Sections ◽  
Top Quark ◽  
High Energy Physics ◽  
Center Of Mass ◽  
High Energy ◽  
New Physics ◽  
Decay Modes ◽  
Center Of Mass Energy ◽  
Higgs Decay

The Higgs boson was discovered on the 4th of July 2012 with a mass around 125 GeV by ATLAS and CMS experiments at LHC. Determining the Higgs properties (production and decay modes, couplings,...) is an important part of the high-energy physics programme in this decade. A search for the Higgs boson production in association with a top quark pair (tt̄H) at ATLAS [1] is summarized in this paper at an unexplored center-of-mass energy of 13 TeV, which could allow a first direct measurement of the top quark Yukawa coupling and could reveal new physics. The tt̄H analysis in ATLAS is divided into 3 channels according to the Higgs decay modes: H → Hadrons, H → Leptons and H → Photons. The best-fit value of the ratio of observed and Standard Model cross sections of tt̄H production process, using 2015-2016 data and combining all tt̄H final states, is 1:8±0:7, corresponds to 2:8σ (1:8σ) observed (expected) significance.

scholarly journals Search for flavor changing neutral currents in top quark decays in pp collisions at 7 TeV

2013 ◽  
Vol 718 (4-5) ◽  
pp. 1252-1272 ◽  
Author(s):  
S. Chatrchyan ◽  
V. Khachatryan ◽  
A.M. Sirunyan ◽  
A. Tumasyan ◽  
W. Adam ◽  
...  
Keyword(s):  
Top Quark ◽  
Neutral Currents ◽  
Pp Collisions ◽  
Flavor Changing ◽  
Quark Decays ◽  
Flavor Changing Neutral Currents

scholarly journals Search for Top-Quark Production via Flavor-Changing Neutral Currents inW+1Jet Events at CDF

2009 ◽  
Vol 102 (15) ◽  
Author(s):  
T. Aaltonen ◽  
J. Adelman ◽  
T. Akimoto ◽  
B. Álvarez González ◽  
S. Amerio ◽  
...  
Keyword(s):  
Top Quark ◽  
Neutral Currents ◽  
Flavor Changing ◽  
Top Quark Production ◽  
Quark Production ◽  
Flavor Changing Neutral Currents

scholarly journals NEXT-TO-NEXT-TO-LEADING ORDER SOFT AND VIRTUAL CORRECTIONS FOR QCD, HIGGS AND SUSY PROCESSES

2004 ◽  
Vol 19 (06) ◽  
pp. 405-419 ◽  
Author(s):  
NIKOLAOS KIDONAKIS
Keyword(s):  
Top Quark ◽  
W Boson ◽  
Neutral Current ◽  
Leading Order ◽  
Large Transverse Momentum ◽  
Hadron Colliders ◽  
Unified Approach ◽  
Anomalous Couplings ◽  
Flavor Changing ◽  
Flavor Changing Neutral Current

We review recent advances in the calculation of higher-order soft-gluon corrections for a variety of QCD, Higgs, and SUSY processes in hadron colliders. A unified approach and master formulas for next-to-next-to-leading order soft and virtual corrections are discussed. We present some applications of the formalism to top quark pair production at the Tevatron and the LHC, top production via anomalous couplings in flavor-changing neutral-current processes, W boson hadroproduction at large transverse momentum, and charged Higgs production at the LHC.

scholarly journals Flavor changing Z0 decay and the top quark

1982 ◽  
Vol 209 (2) ◽  
pp. 349-371 ◽  
Author(s):  
Alan Axelrod
Keyword(s):  
Top Quark ◽  
Flavor Changing
Sign in / Sign up

Export Citation Format

Share Document