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Performance of the DUNE Photon Detection System
Get PDFDUNE(Deep Underground Neutrino Experiment) is a long-baseline experiment currently under construction at the Sanford Underground Research Facility (SURF) in South Dakota, US. The Far Detector (FD) is based on the Liquid Argon Time Projection Chamber (LAr-TPC) technology. The main physics goals of DUNEinclude determining the mass ordering of neutrinos with a significance greater than > 5σ and measuring the CP-violating phase in the lepton sector by studying neutrino oscillations. DUNE is also expected to be highly competitive in studying astro-particle phenomena, such as solar, atmospheric, and supernova neutrinos. The Photon Detection System (PDS) serves as the trigger for non-beam events in the experiment and provides the estimation of the absolute time of an event. This capability enables the reconstruction of the interaction vertex with a precision on the order of 1mm. Additionally, the PDS enhances the energy resolution of the experiment with the combined charge-light calorimetry
Flavour anomalies, correlations, hadronic uncertainties, and all that
Get PDFWe present a short overview of the so-called flavour anomalies, discussing their significance and the connections with QCD issues discussed at the HADRON 2023 conference
Low-lying baryon resonances from lattice QCD
Get PDFRecent results studying the masses and widths of low-lying baryon resonances in lattice QCD are presented. The S-wave Nπ scattering lengths for both total isospins I = 1/2 and I = 3/2 are inferred from the finite-volume spectrum below the inelastic threshold together with the I = 3/2 P-wave containing the Δ(1232) resonance. A lattice QCD computation employing a combined basis of three-quark and meson-baryon interpolating operators with definite momentum to determine the coupled channel Σπ-NK scattering amplitude in the Λ(1405) region is also presented. Our results support the picture of a two-pole structure suggested by theoretical approaches based on SU(3) chiral symmetry and unitarity
Isoscalar axial-vector bottom-charm tetraquarks from QCD
Get PDFThe increasing number of discovered heavy quark exotic hadrons call for immediate theoretical investigations based on first principles. Our study focuses on tetraquark states made up of a bottom and charm quark in the axialvector (1+) channel with isospin I = 0, using Lattice Quantum Chromodynamics. These computations were conducted on the state-of-the-art MILC ensembles using dynamical up/down, strange, and charm quark fields implemented with a highly
improved staggered quark action. The valence quarks were implemented using an overlap action, with quark masses ranging from light to the charm sector, while the evolution of the bottom quark was studied within a non-relativistic QCD framework. We observe strong evidence of an energy level beneath the elastic threshold, which implies an attractive interaction between the bottom and charm mesons, indicating
the possible existence of bound charmed-bottomed tetraquarks
Molecular states of D∗D∗K¯∗ and B∗B∗K∗ nature
Get PDFWe report the theoretical study of the three-body system composed of D∗D∗K¯ ∗ and B∗B∗K∗. We study the interaction of two D∗ (or two B¯∗) and one K¯ ∗ by using the fixed center approximation to the Faddeev equations to search for
bound states of the three-body system. Since the D∗D∗ interaction is attractive and the D∗K¯ ∗ interaction is also attractive, we can expect to obtain the bound state of the three-body system D∗D∗K¯ ∗, which is manifestly exotic state with ccs open quarks. Using the same analogy of the D∗D∗K¯ ∗ system, we also study the B¯∗B¯∗K¯ ∗ system containing the bbs open quarks since both interactions of B¯∗B¯∗ and B¯∗K¯ ∗ are attractive. We obtain the bound states of isospin I = 1/2, negative parity, and total spin J = 0, 1 and 2
Mass spectrum of three-quark and five-quark singly heavy baryons from a chiral model
Get PDFWe construct a chiral effective model for three-quark and five-quark singly heavy baryons (SHBs) which is heavy-quark spin singlet, focusing on the U(1)A axial anomaly effects. Based on the model, we find that the anomaly effects
induce the inverse mass hierarchy of negative-parity three-quark SHBs, where Λc becomes heavier than Ξc. On the contrary, the anomaly effect is found to provide no effects for the mass spectrum of five-quark SHBs. We also present a predicted mass spectrum of the SHBs in the presence of the mixing between three-quark and five-quark states. The predicted five-quark dominant Λc(−), whose mass is approximately 2700 MeV, is expected to be a useful evidence to check our description
On the prediction of spectral densities from Lattice QCD
Get PDFHadronic spectral densities play a pivotal role in particle physics, a prime example being the R-ratio defined from electron-positron scattering into hadrons. To predict them from first principles using Lattice QCD, we face a numerically ill-posed inverse problem, due to the Euclidean signature adopted in practical simulations. Here we present a recent numerical analysis of the vector isovector
spectral density extracted using the multi-level algorithm (recently extended also to the case of dynamical fermions) and discuss its implications
Multiple parton scattering: From both theoretical and experimental point of views
Get PDFIn this paper, I will review the recent theoretical, phenomenological,and experimental progress of studying multiple parton scattering at the LHC in both
proton-proton and heavy-ion collisions. I will then highlight two novel measurements and their theoretical interpretations: the first triple J/ψ production studies with the CMS detector for triple parton scattering, and the first double parton scattering measurement of J/ψ plus open charm and two open charm production in proton-lead collisions by the LHCb Collaboration
Model selection in kaon photoproduction
Get PDFWe study photoproduction of kaons on protons within the framework of isobar model. Our models were constructed using consistent formalism for exchanges of high-spin resonances and with energy-dependent widths of nucleon resonances. For adjusting free parameters of the model to experimental data we employ regularization techniques, which prevent us from overfitting the data and help us select the appropriate model. We analysed the abundant data on the K+Λ channel as well as the recent data on K+Σ− channel and show comparisons of the results with data
Insight into emergence of hadron mass from N∗ electroexcitation amplitudes
Get PDFThe emergence of hadron mass represents one of the most challenging and still open problems in contemporary hadron physics. The results on the nucleon resonance electroexcitation amplitudes available from the CLAS data on πN and π+π−p electroproduction analyzed within the continuum Schwinger method open up a new avenue for gaining insight into the strong interaction dynamics that are responsible for the generation of the dominant part of hadron mass. Future prospects of these studies in experiments of the 12 GeV era with CLAS12 and after a potential increase of the CEBAF energy up to 22 GeV will offer a unique opportunity to
explore the full range of distances where the dominant part of hadron mass and N∗ structure emerge from QCD