Kaonic Atoms to Investigate Global Symmetry Breaking

Curceanu, C.; Guaraldo, C.; Sirghi, D.; Amirkhani, A.; Baniahmad, A.; Bellotti, Giovanni; Bosnar, D.; Bragadireanu, M.; Cargnelli, M.; Carminati, Marco; Clozza, A.; Paolis, L. De; Grande, R. Del; Fiorini, C.; Iliescu, M.; Iwasaki, M.; King, Pietro; Sandri, P. Levi; Márton, J.; Miliucci, M.; Moskal, P.; Niedźwiecki, Szymon; Okada, S.; Piscicchia, K.; Scordo, A.; Silarski, M.; Sirghi, F.; Skurzok, M.; Spallone, A.; Tüchler, M.; Utica, G.; Doce, O. Vázquez; Zmeskal, J.

doi:10.3390/sym12040547

Cited by 20 publications

(17 citation statements)

References 26 publications

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“…In addition, the yet to be measured 1S level shift of kaonic deuterium will put further constraints on theKN interaction [62,63]. For the status of such measurements, see [64]. Further progress has also been made by including the P-waves and performing a sophisticated error analysis [65], confirming again and sharpening further the two-pole scenario of the Λ(1405) (note that the P-waves had already been included earlier with a focus on the S = 0 sector [66]).…”

Section: Where Do We Stand?mentioning

confidence: 99%

Two-Pole Structures in QCD: Facts, Not Fantasy!

Meißner

2020

Symmetry

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The two-pole structure refers to the fact that particular single states in the spectrum as listed in the PDG tables are often two states. The story began with the Λ ( 1405 ) , when in 2001, using unitarized chiral perturbation theory, it was observed that there are two poles in the complex plane, one close to the K ¯ p and the other close to the π Σ threshold. This was later understood combining the SU(3) limit and group-theoretical arguments. Different unitarization approaches that all lead to the two-pole structure have been considered in the mean time, showing some spread in the pole positions. This fact is now part of the PDG book, although it is not yet listed in the summary tables. Here, I discuss the open ends and critically review approaches that cannot deal with this issue. In the meson sector, some excited charm mesons are good candidates for such a two-pole structure. Next, I consider in detail the D 0 * ( 2300 ) , which is another candidate for this scenario. Combining lattice QCD with chiral unitary approaches in the finite volume, the precise data of the Hadron Spectrum Collaboration for coupled-channel D π , D η , D s K ¯ scattering in the isospin I = 1 / 2 channel indeed reveal its two-pole structure. Further states in the heavy meson sector with I = 1 / 2 exhibiting this phenomenon are predicted, especially in the beauty meson sector. I also discuss the relation of these two-pole structures and the possible molecular nature of the states under consideration.

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Section: Where Do We Stand?mentioning

confidence: 99%

Two-Pole Structures in QCD: Facts, Not Fantasy!

Meißner

2020

Symmetry

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“…The numerical calculations have been carried on with high accuracy, in order to give a clearcut distinction and enumeration of the levels although, nowadays, they still cannot be experimentally observed. In any case the great physical relevance of the mesic atoms is well known: for instance many decades ago Dalitz underlined the great importance of the "definitive determination of the energy level shifts in the K-Hydrogen and Deuterium, because of their direct connection with the physics of K-nucleon interaction and their complete independence from all other kinds of measurements which bear on this interaction" (quoted by [9]). This justifies the efforts in order to obtain the electromagnetic spectrum as precise as possible.…”

Section: Discussionmentioning

confidence: 99%

“…This justifies the efforts in order to obtain the electromagnetic spectrum as precise as possible. The experiments now in progress mainly in kaonic atoms [9,30] will hopefully give a breakthrough in this direction.…”

Section: Discussionmentioning

confidence: 99%

“…The physical interest for such systems is due to the fact that meson masses are two-three order of magnitude larger than the electron mass, their atomic orbits are of the order of hundred fm and their binding energies of some keV. Therefore they provide a particularly useful opportunity for studying nuclear interactions in QCD low energy regime [7][8][9]. The effects of the strong interactions on the spectrum is given by a shift of the purely electromagnetic levels and an absorption width, both of them experimentally measured through X-ray spectroscopy [10].…”

Section: Introductionmentioning

confidence: 99%

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Relativistic levels of mesic atoms

Giachetti,

Sorace

2020

Preprint

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We revisit the derivation of the covariant two-body scalar-fermion equation with a Coulomb interaction, presented in a previous paper. We show that it can be given the formal aspect of a Dirac equation, but for the fact that the eigenvalue is also contained in one of the coefficients and thus it is not linearly included. The discussion of the boundary value problem is therefore different, although some properties of the Dirac equation can be recovered in an approximation bringing back to the concept of reduced mass. We discuss a mixed analytic-numerical method of solution which allows to obtain very accurate results and we calculate the lowest levels, states and QED corrections for pionic and kaonic atoms.

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“…Among these, the SDDs' excellent spectroscopic performances are used for light kaonic atom X-ray spectroscopy to accurately determine shifts ( ) and widths (Γ) of the atomic levels caused by the KN strong interaction. These measurements allow one to probe the non-perturbative quantum chromodynamics (QCD) in the strangeness sector, with implications extending from particle and nuclear physics to astrophysics [8][9][10][11]. In 2009, the SDDs technology was employed for the first time by the SIDDHARTA collaboration [12], at the DAΦNE collider [13,14] of Istituto Nazionale di Fisica Nucleare-Laboratori Nazionali di Frascati (INFN-LNF), achieving the most precise measurements of the K − H fundamental level shift ( ) and width (Γ).…”

Section: Introductionmentioning

confidence: 99%

Silicon Drift Detectors’ Spectroscopic Response during the SIDDHARTA-2 Kaonic Helium Run at the DAΦNE Collider

et al. 2021

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A large-area silicon drift detectors (SDDs) system has been developed by the SIDDHARTA-2 collaboration for high precision light kaonic atom X-ray spectroscopy at the DAΦNE collider of Istituto Nazionale di Fisica Nucleare—Laboratori Nazionali di Frascati. The SDDs’ geometry and electric field configuration, combined with their read-out electronics, make these devices suitable for performing high precision light kaonic atom spectroscopy measurements in the background of the DAΦNE collider. This work presents the spectroscopic response of the SDDs system during the first exotic atoms run of SIDDHARTA-2 with kaonic helium, a preliminary to the kaonic deuterium data taking campaign. The SIDDHARTA-2 spectroscopic system has good energy resolution and a 2 μs timing window which rejects the asynchronous events, scaling the background by a factor of 10−5. The results obtained for the first exotic atoms run of SIDDHARTA-2 prove this system to be ready to perform the challenging kaonic deuterium measurement.

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Kaonic Atoms to Investigate Global Symmetry Breaking

Cited by 20 publications

References 26 publications

Two-Pole Structures in QCD: Facts, Not Fantasy!

Two-Pole Structures in QCD: Facts, Not Fantasy!

Relativistic levels of mesic atoms

Silicon Drift Detectors’ Spectroscopic Response during the SIDDHARTA-2 Kaonic Helium Run at the DAΦNE Collider

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