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"Hadron interactions."
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Publisher Correction: Unveiling the strong interaction among hadrons at the LHC
A Correction to this paper has been published: https://doi.org/10.1038/s41586-020-03142-2.
Journal Article
Author Correction: A detailed map of Higgs boson interactions by the ATLAS experiment ten years after the discovery
In the version of this article initially published, the ATLAS Collaboration author names, affiliations and acknowledgements were omitted and have now been included in the HTML and PDF versions of the article.
Journal Article
Doubly Charmed Tetraquark \\(T^+_cc\\) from Lattice QCD near Physical Point
The doubly charmed tetraquark \\(T^+_cc\\) recently discovered by the LHCb Collaboration is studied on the basis of \\((2+1)\\)-flavor lattice QCD simulations of the \\(D^*D\\) system with nearly physical pion mass \\(m_=146\\) MeV. The interaction of \\(D^*D\\) in the isoscalar and \\(S\\)-wave channel, derived from the hadronic spacetime correlation by the HAL QCD method, is attractive for all distances and leads to a near-threshold virtual state with a pole position \\(E_pole=-59(^+53_-99)(^+2_-67)\\) keV and a large scattering length \\(1/a_0=0.05(5)(^+2_-2)~fm^-1\\). The virtual state is shown to evolve into a loosely bound state as \\(m_\\) decreases to its physical value by using a potential modified to \\(m_=135\\) MeV based on the pion-exchange interaction. Such a potential is found to give a semiquantitative description of the LHCb data on the \\(D^0D^0^+\\) mass spectrum. Future study is necessary to perform physical-point simulations with the isospin-breaking and open three-body-channel effects taken into account.
Paper
Building Diquark Model from Lattice QCD
A novel Lattice QCD (LQCD) method to determine the quark–diquark (q–D) interaction potential together with the diquark mass (mD) is proposed. Similar to the HAL QCD method, q–D potential is determined by demanding it to reproduce the q–D equal-time Nambu–Bethe–Salpeter (NBS) wave function. To do this, it is necessary to use the masses of the quark and the diquark as inputs, which however are not straightforwardly obtained because of the color confinement of QCD. In this work, masses of quark and diquark are determined by demanding that the p-wave spectrums from the two-point correlators be reproduced by the potentials for cc¯ and q–D sectors determined from the NBS wave functions. Numerical calculations are performed by using 2+1 flavor QCD gauge configurations with the pion mass mπ≃700 MeV generated by PACS-CS collaboration. We apply our method to the c–c¯ system and the charm-diquark system (Λc baryon) to obtain the charm quark mass, diquark mass and the c–D potential. Our preliminary analysis leads to the diquark mass mD≃1.127 GeV which is roughly consistent with a naive estimate based on the constituent quark picture, i.e., mD≃mρ≃1.12 GeV and mD≃2mN/3≃1.06 GeV.
Journal Article
Emergence of Hadron Mass and Structure
Visible matter is characterised by a single mass scale; namely, the proton mass. The proton’s existence and structure are supposed to be described by quantum chromodynamics (QCD); yet, absent Higgs boson couplings, chromodynamics is scale-invariant. Thus, if the Standard Model is truly a part of the theory of Nature, then the proton mass is an emergent feature of QCD; and emergent hadron mass (EHM) must provide the basic link between theory and observation. Nonperturbative tools are necessary if such connections are to be made; and in this context, we sketch recent progress in the application of continuum Schwinger function methods to an array of related problems in hadron and particle physics. Special emphasis is given to the three pillars of EHM—namely, the running gluon mass, process-independent effective charge, and running quark mass; their role in stabilising QCD; and their measurable expressions in a diverse array of observables.
Journal Article
Zenith-Angle Dependence of Local Muon Density Spectra of Extensive Air Shower near the Horizon
The integral local muon density spectra (LMDS) of (extensive air shower) EAS at large zenith angles were reconstructed on the basis of the DECOR experimental data on muon bundles detected in a long-term measurement series from May 3, 2012, to April 7, 2023. The results were obtained at two threshold muon density values of 0.015 and 0.068 particles/m
2
, which corresponded to the detection of bundles with a multiplicity of at least 3 and at least 5 muons in the detector. At zenith angles less than 80°, the zenith-angle dependence of LMDS is well described by a power function of the cosine of the zenith angle. However, with a further increase in the zenith angle, this dependence changes significantly, and at angles of 87°–88°, the measured values exceed the specified simple extrapolation by about an order of magnitude. This is due to the inapplicability of the flat atmosphere approximation at such angles. A simple equation was obtained that takes into account the curvature of the Earth’s atmosphere.
Journal Article