scholarly journals A search for top quark decays to a charged Higgs boson in proton - anti-proton collisions at a center-of-mass energy of 1.8-TeV

1999 ◽  
Author(s):  
Brendan Elwood Bevensee
Keyword(s):  
Higgs Boson ◽  
Top Quark ◽  
Center Of Mass ◽  
Charged Higgs Boson ◽  
Mass Energy ◽  
Proton Collisions ◽  
Center Of Mass Energy ◽  
Quark Decays ◽  
Charged Higgs

scholarly journals Possible Impact of the Fourth-Generation Quarks on Production of a Charged Higgs Boson at the LHC

2012 ◽  
Vol 2012 ◽  
pp. 1-8
Author(s):  
R. Çiftçi ◽  
A. K. Çiftçi ◽  
S. Sultansoy
Keyword(s):  
Higgs Boson ◽  
Hadron Collider ◽  
Center Of Mass ◽  
Mass Range ◽  
Charged Higgs Boson ◽  
Fourth Generation ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Charged Higgs ◽  
The Impact

We investigate the impact of the fourth-generation quarks on production and decays of the charged Higgs boson at CERN Large Hadron Collider (LHC) with 14 TeV center of mass energy. The signal is the process gg→u4¯u4, followed by u4¯→W−b¯ and u4→h+b decays with subsequent h+→tb̅ and corresponding hermitic conjugates. It is shown that if mu4=400 GeV, then considered process will provide unique opportunity to discover charged Higgs boson with mass range of 200 to 350 GeV at the LHC.

scholarly journals Search for production of four top quarks in final states with same-sign or multiple leptons in proton–proton collisions at $$\sqrt{s}=13$$ $$\,\text {TeV}$$

2020 ◽  
Vol 80 (2) ◽  
Author(s):  
A. M. Sirunyan ◽  
◽  
A. Tumasyan ◽  
W. Adam ◽  
F. Ambrogi ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Top Quark ◽  
Center Of Mass ◽  
Top Quarks ◽  
Higgs Doublet ◽  
Effective Field ◽  
Proton Proton ◽  
Proton Collisions ◽  
Center Of Mass Energy ◽  
Proton Proton Collisions

Abstract The standard model (SM) production of four top quarks ($$\text {t} {}{\overline{\text {t}}} \text {t} {}{\overline{\text {t}}} $$tt¯tt¯) in proton–proton collisions is studied by the CMS Collaboration. The data sample, collected during the 2016–2018 data taking of the LHC, corresponds to an integrated luminosity of 137$$\,\text {fb}^{-1}$$fb-1 at a center-of-mass energy of 13$$\,\text {TeV}$$TeV. The events are required to contain two same-sign charged leptons (electrons or muons) or at least three leptons, and jets. The observed and expected significances for the $$\text {t} {}{\overline{\text {t}}} \text {t} {}{\overline{\text {t}}} $$tt¯tt¯ signal are respectively 2.6 and 2.7 standard deviations, and the $$\text {t} {}{\overline{\text {t}}} \text {t} {}{\overline{\text {t}}} $$tt¯tt¯ cross section is measured to be $$12.6^{+5.8}_{-5.2}\,\text {fb} $$12.6-5.2+5.8fb. The results are used to constrain the Yukawa coupling of the top quark to the Higgs boson, $$y_{\text {t}}$$yt, yielding a limit of $$|y_{\text {t}}/y_{\text {t}}^{\mathrm {SM}} | < 1.7$$|yt/ytSM|<1.7 at $$95\%$$95% confidence level, where $$y_{\text {t}}^{\mathrm {SM}}$$ytSM is the SM value of $$y_{\text {t}}$$yt. They are also used to constrain the oblique parameter of the Higgs boson in an effective field theory framework, $$\hat{H}<0.12$$H^<0.12. Limits are set on the production of a heavy scalar or pseudoscalar boson in Type-II two-Higgs-doublet and simplified dark matter models, with exclusion limits reaching 350–470$$\,\text {GeV}$$GeV and 350–550$$\,\text {GeV}$$GeV for scalar and pseudoscalar bosons, respectively. Upper bounds are also set on couplings of the top quark to new light particles.

scholarly journals Search for a light charged Higgs boson in top quark decays in pp collisions at $ \sqrt {s} = 7\;TeV $

2012 ◽  
Vol 2012 (7) ◽  
Author(s):  
S. Chatrchyan ◽  
◽  
V. Khachatryan ◽  
A. M. Sirunyan ◽  
A. Tumasyan ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Top Quark ◽  
Charged Higgs Boson ◽  
Pp Collisions ◽  
Quark Decays ◽  
Charged Higgs

scholarly journals Measuring the quartic Higgs self-coupling at a multi-TeV muon collider

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
M. Chiesa ◽  
F. Maltoni ◽  
L. Mantani ◽  
B. Mele ◽  
F. Piccinini ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Center Of Mass ◽  
Mass Energy ◽  
Simple Analysis ◽  
Proton Proton ◽  
Coupling Interaction ◽  
Center Of Mass Energy ◽  
Muon Collider ◽  
Better Than

Abstract Measuring the shape of the Higgs boson potential is of paramount importance, and will be a challenging task at current as well as future colliders. While the expectations for the measurement of the trilinear Higgs self-coupling are rather promising, an accurate measurement of the quartic self-coupling interaction is presently considered extremely challenging even at a future 100 TeV proton-proton collider. In this work we explore the sensitivity that a muon collider with a center of mass energy in the multi-TeV range and luminosities of the order of 1035cm−2s−1, as presently under discussion, might provide, thanks to a rather large three Higgs-boson production and to a limited background. By performing a first and simple analysis, we find a clear indication that a muon collider could provide a determination of the quartic Higgs self-coupling that is significantly better than what is currently considered attainable at other future colliders.

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