| Issue |
EPJ Web Conf.
Volume 137, 2017
XIIth Quark Confinement and the Hadron Spectrum
|
|
|---|---|---|
| Article Number | 08004 | |
| Number of page(s) | 9 | |
| Section | Section E: QCD and New Physics | |
| DOI | https://doi.org/10.1051/epjconf/201713708004 | |
| Published online | 22 March 2017 | |
https://doi.org/10.1051/epjconf/201713708004
Recent progress on QCD inputs for axion phenomenology
1 Dipartimento di Fisica dell’Università di Pisa, Largo Pontecorvo 3, I-56127 Pisa, Italy
2 NFN sezione di Pisa, Largo Pontecorvo 3, I-56127 Pisa, Italy
3 Dipartimento di Fisica dell’Università di Roma “La Sapienza”,, Piazzale Aldo Moro 5, I-00185 Roma, Italy
4 INFN Sezione di Roma La Sapienza, Piazzale Aldo Moro 5, I-00185 Roma, Italy
5 School of Physics and Astronomy, University of Southampton, SO17 1BJ Southampton, United Kingdom
6 Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy
a e-mail: claudio.bonati@df.unipi.it present address: Dipartimento di Fisica e Astronomia & INFN-Sezione di Firenze, Via Sansone 1, 50019, Sesto Fiorentino (FI), Italy
b Speaker; e-mail: massimo.delia@unipi.it
c e-mail: mariti@df.unipi.it
d e-mail: guido.martinelli@roma1.infn.it
e e-mail: mesiti@pi.infn.it
f e-mail: fnegro@pi.infn.it
g e-mail: f.sanfilippo@soton.ac.uk present address: INFN, Sez. di Roma Tre, Via della Vasca Navale 84, I-00146 Rome, Italy
h e-mail: giovanni.villadoro@ictp.it
Published online: 22 March 2017
The properties of the QCD axion are strictly related to the dependence of strong interactions on the topological parameter theta. We present a determination of the topological properties of QCD for temperatures up to around 600 MeV, obtained by lattice QCD simulations with 2+1 flavors and physical quark masses. Numerical results for the topological susceptibility, when compared to instanton gas computations, differ both in size and in the temperature dependence. We discuss the implications of such findings for axion phenomenology, also in comparison to similar studies in the literature, and the prospects for future investigations.
© The Authors, published by EDP Sciences, 2017
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