Results 121 to 130 of about 1,219,015 (217)

Search for electroweak production of a vector-like quark decaying to a top quark and a Higgs boson using boosted topologies in fully hadronic final states

open access: yesJournal of High Energy Physics, 2017
A search is performed for electroweak production of a vector-like top quark partner T of charge 2/3 in association with a standard model top or bottom quark, using 2.3 fb−1 of proton-proton collision data at s = 13 $$ \sqrt{s}=13 $$ TeV collected by the ...
The CMS collaboration   +2246 more
doaj   +1 more source

The six-quark structure of long-lived $D$-mesons and $ψ/J$ [PDF]

open access: yesarXiv, 2007
The harmonic quarks are applied to the analysis of quark structures of long-lived $D$-mesons and $\psi/J$. In the harmonic quark model the quarks of long-lived mesons ($\pi^0$, $\pi^\pm$, $K^\pm$, $K^0$, $B^0$, $B^\pm$) are weakly relativistic objects with the excess energy of valent quarks less than 7 MeV.
arxiv  

Quark Model Perspectives on Pentaquark Exotics

open access: yes, 2004
Expectations and predictions for pentaquark exotics based on the quark model perspective are presented. Recent quark model scenarios, and calculations performed in different realizations of the quark model approach, up to the end of March 2004, are also ...
Maltman, Kim
core   +2 more sources

Limited matching of the cardiac output response to the peripheral demand of heat stress and exercise

open access: yesExperimental Physiology, EarlyView.
Abstract It is widely accepted that cardiac output matches the prevailing peripheral demand in healthy humans. However, it remains unknown whether stroke volume and heart rate are regulated interdependently to arrive at a specific cardiac output. The aim of this study was to determine whether the healthy human heart responds specifically according to ...
Moritz Lampkemeyer   +8 more
wiley   +1 more source

Baryon form factors in a diquark-quark bound state description

open access: yes, 1995
Nucleon form factors are calculated in a relativistic diquark--quark picture based on the Nambu--Jona-Lasinio model. The nucleon wave function is obtained in a static approximation to the quark exchange interaction between the valence quark and the ...
Anselmino   +20 more
core   +1 more source

Exercise‐induced plasma mature brain‐derived neurotrophic factor elevation in children, adolescents and adults: influence of age, maturity and physical activity

open access: yesThe Journal of Physiology, EarlyView.
Abstract figure legend Here we evaluate the acute effect of endurance exercise on circulating pro‐ (proBDNF) and mature brain‐derived neurotrophic factor (mBDNF) in 20 healthy children, 19 adolescents and 39 adults. The volunteers ran a time trial for 45 min, and platelet‐poor plasma was collected before and after the exercise intervention.
Sebastian Edman   +9 more
wiley   +1 more source

QCD θ-vacua from the chiral limit to the quenched limit

open access: yesNuclear Physics B, 2014
We investigate the dependence of the QCD vacuum structure on the θ-angle and quark mass, using the Di-Vecchia–Veneziano model. Although the Di-Vecchia–Veneziano model is a chiral effective model, it contains the topological properties of the pure Yang ...
Kazuya Mameda
doaj   +1 more source

Exercise limitations in amyloid cardiomyopathy assessed by cardiopulmonary exercise testing—A multicentre study

open access: yesESC Heart Failure, Volume 12, Issue 2, Page 1326-1335, April 2025.
Abstract Aims Amyloid cardiomyopathy is caused by the deposition of light chain (AL) or transthyretin amyloid (ATTR) fibrils, that leads to a restrictive cardiomyopathy, often resulting in heart failure (HF) with preserved or reduced ejection fraction.
Robin Willixhofer   +25 more
wiley   +1 more source

Foundations of the constitutent quark model [PDF]

open access: yesProgress in Particle and Nuclear Physics, 1996
Lecture at the International School of Nuclear Physics, September 19 -- 27, 1995, Erice, Italy. 17 p.
openaire   +3 more sources

Study of heavy quark conserving weak decays in the quark model

open access: yesPhysics Letters B, 2022
Within the framework of a constituent quark model, we investigate the heavy quark conserving weak decays of Ξc and Ξb. This process involves elementary transitions of us→du or s→udu¯ with the heavy quark as a spectator, while for the charmed baryon in ...
Peng-Yu Niu, Qian Wang, Qiang Zhao
doaj  

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