Improved axion emissivity from a supernova via nucleon-nucleon bremsstrahlung - INSPIRE

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Improved axion emissivity from a supernova via nucleon-nucleon bremsstrahlung

Pierluca Carenza
(
- Bari U. and
- INFN, Bari
)
,
Tobias Fischer
(
- Wroclaw U.
)
,
Maurizio Giannotti
(
- Barry U.
)
,
Gang Guo
(
- Darmstadt, GSI
)
,
Gabriel Martínez-Pinedo
(
- Darmstadt, GSI and
- Darmstadt, Tech. Hochsch.
)

Jun 27, 2019

33 pages

Published in:

JCAP 10 (2019) 10, 016,
JCAP 05 (2020) 05, E01 (erratum)

Published: Oct 4, 2019

e-Print:

1906.11844 [hep-ph]

DOI:

10.1088/1475-7516/2019/10/016 (publication),
10.1088/1475-7516/2020/05/E01 (erratum)

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Abstract: (IOP)

The most efficient axion production mechanism in a supernova (SN) core is the nucleon-nucleon bremsstrahlung. This process has been often modeled at the level of the vacuum one-pion exchange (OPE) approximation. Starting from this naive recipe, we revise the calculation including systematically different effects, namely a non-vanishing mass for the exchanged pion, the contribution from the two-pions exchange, effective in-medium nucleon masses and multiple nucleon scatterings. Moreover, we allow for an arbitrary degree of nucleon degeneracy. A self consistent treatment of the axion emission rate including all these effects is currently missing. The aim of this work is to provide such an analysis. Furthermore, we demonstrate that the OPE potential with all the previous corrections gives rise to similar results as the on-shell T-matrix, and is \pagebreak therefore well justified for our and similar studies. We find that the axion emissivity is reduced by over an order of magnitude with respect to the basic OPE calculation, after all these effects are accounted for. The implications for the axion mass bound and the impact for the next generation experimental axion searches is also discussed.

Note:

v3: 34 pages, 19 pdf figures. Major changes. Corrected the nucleon chemical potentials. Axion mass bound strengthened with respect to the previous version. Details of changes documented in the corresponding JCAP Erratum

axions
core-collapse supernovas
supernova neutrinos
nucleon nucleon: bremsstrahlung
axion: mass
axion: production
nucleon: mass
exchange: one-pion
exchange: two-pion
supernova

References(7)

Figures(34)

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[5]

Improved axion emissivity from a supernova via nucleon-nucleon bremsstrahlung

Pierluca Carenza
(
- Bari U. and
- INFN, Bari
)
,
Tobias Fischer
(
- Wroclaw U.
)
,
Maurizio Giannotti
(
- Barry U.
)
,
Gang Guo
(
- Darmstadt, GSI
)
,
Gabriel Martínez-Pinedo
(
- Darmstadt, GSI and
- Darmstadt, Tech. Hochsch.
)

et al.

- JCAP 10 (2019) 10, 016,
- JCAP 05 (2020) 05, E01 (erratum)
•
e-Print:
- 1906.11844
•
DOI:
- 10.1088/1475-7516/2019/10/016

[6]

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Physics potential of the International Axion Observatory (IAXO)

IAXO

Collaboration

•

E. Armengaud
(
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)

et al.

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•
e-Print:
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•
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