Výsledky vyhledávání - "expansion: chiral"

Autor: Di Luzio, Luca, Piazza, Gioacchino

We discuss the construction of the two-flavour axion-pion effective Lagrangian at the next-to-leading order (NLO) in chiral perturbation theory and present two phenomenological applications: the scattering $a\pi \to \pi\pi$, relevant for axion therma

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od_______166::f1a8190a8c4cffc113b58cc800e9d8ed
https://hal.archives-ouvertes.fr/hal-03702743

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Breakdown of Chiral Perturbation Theory for the Axion Hot Dark Matter Bound

Autor: Di Luzio, Luca, Martinelli, Guido, Piazza, Gioacchino

Publikováno v: Physical Review Letters
Physical Review Letters, American Physical Society, 2021, 126 (24), pp.241801. ⟨10.1103/PhysRevLett.126.241801⟩
Physical review letters 126(24), 241801 (2021). doi:10.1103/PhysRevLett.126.241801

Physical review letters 126(24), 241801 (2021). doi:10.1103/PhysRevLett.126.241801
We show that the commonly adopted hot dark matter bound on the axion mass ma≲1 eV is not reliable, since it is obtained by extrapolating the chiral expansion in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8af159a915c8e36504cc33c70e50bad0
https://doi.org/10.1103/physrevlett.126.241801

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Axion hot dark matter bound, reliably

Autor: Di Luzio, Luca, Martinelli, Guido, Piazza, Gioacchino

We show that the commonly adopted hot dark matter (HDM) bound on the axion mass $m_a \lesssim$ 1 eV is not reliable, since it is obtained by extrapolating the chiral expansion in a region where the effective field theory breaks down. This is explicit

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Extended chiral Khuri-Treiman formalism for $\eta\to 3\pi$ and the role of the $a_0(980)$, $f_0(980)$ resonances

Autor: Albaladejo, M., Moussallam, B.

Publikováno v: Eur.Phys.J.C
Eur.Phys.J.C, 2017, 77 (8), pp.508. ⟨10.1140/epjc/s10052-017-5052-x⟩
European Physical Journal C: Particles and Fields
European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2017, 77 (8), pp.508. ⟨10.1140/epjc/s10052-017-5052-x⟩
Eur.Phys.J.C, 2017, 77 (8), pp.508. 〈10.1140/epjc/s10052-017-5052-x〉

Recent experiments on $\eta\to 3\pi$ decays have provided an extremely precise knowledge of the amplitudes across the Dalitz region which represent stringent constraints on theoretical descriptions. We reconsider an approach in which the low-energy c

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https://hal.archives-ouvertes.fr/hal-01584664

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Elastic and inelastic pion-nucleon scattering to fourth order in chiral perturbation theory

Autor: Véronique Bernard, Evgeny Epelbaum, Hermann Krebs, A. M. Gasparyan, D. Siemens, Ulf-G. Meißner

Publikováno v: Physical Review C
Physical Review C, American Physical Society, 2017, 96 (5), pp.055205. ⟨10.1103/PhysRevC.96.055205⟩
Phys.Rev.C
Phys.Rev.C, 2017, 96 (5), pp.055205. 〈10.1103/PhysRevC.96.055205〉
Phys.Rev.C, 2017, 96 (5), pp.055205. ⟨10.1103/PhysRevC.96.055205⟩
Physical review / C 96(5), 055205 (2017). doi:10.1103/PhysRevC.96.055205

We extend our previous study of elastic pion-nucleon scattering in the framework of chiral perturbation theory by performing a combined analysis of the reactions $\pi N \to \pi N$ and $\pi N \to \pi \pi N$. The calculation is carried out to fourth or

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::69b213362dddb9464cb4c04b166a0aa7
https://hal.archives-ouvertes.fr/hal-01645293

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Role of the $a_{0}(980), f_{0}(980)$ resonances in $\eta \to 3\pi$ from the Khuri-Treiman formalism

Autor: Moussallam, B., Albaladejo, M.

Publikováno v: EPJ Web Conf.
14th International Workshop on Meson Production, Properties and Interaction
14th International Workshop on Meson Production, Properties and Interaction, Jun 2016, Cracow, Poland. pp.03007, ⟨10.1051/epjconf/201613003007⟩

International audience; The chiral expansion of the eta -> 3pi decay amplitude at NLO fails to reproduce the recent high accuracy measurements of the Dalitz plot parameters. We reconsider the idea of employing the chiral expansion in an unphysical re

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::b9523242baa55cd15f3273ad9adb19aa
https://hal.archives-ouvertes.fr/hal-01554672

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