Loop Effects in Direct Detection - INSPIRE

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Loop Effects in Direct Detection

Mar 5, 2018

20 pages

Published in:

JCAP 08 (2018) 017,
JCAP 01 (2019) E01 (erratum)

Published: Aug 13, 2018

e-Print:

1803.01574 [hep-ph]

DOI:

10.1088/1475-7516/2018/08/017,
10.1088/1475-7516/2019/01/E01 (erratum)

View in:

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Abstract: (IOP)

We consider loop level contributions to dark matter— nucleon scattering in cases where the spin independent scattering cross section is absent or suppressed at tree level. In the case of a pseudoscalar interaction, for which the tree level cross section is both spin-dependent and suppressed by 4 powers of the exchanged momentum, loop diagrams give rise to a non-zero spin independent cross section. We show that if the pseudoscalar interaction is formulated using a gauge invariant framework, loop effects generate an effective χ h vertex and result in a scattering cross section that is within reach of current or forthcoming experiments. We also consider the case of inelastic dark matter, for which the dominant interaction terms have an off diagonal χ1−χ2 structure. In this case, the tree-level direct detection cross section is negligible when the inelastic χ1 N → χ2 N process is kinematically suppressed. However, loop diagrams generate a diagonal χ1−χ1 interaction and hence permit measurable, spin independent, χ1 N → χ1 N elastic scattering. As such, we are able to probe parameter space that was previously considered inaccessible to direct detection.

Note:

20 pages, 8 figures

interaction: pseudoscalar
dark matter: scattering
spin: 0
invariance: gauge
spin: dependence
tree approximation
dark matter: direct detection
suppression
dark matter: elastic scattering
dark matter: mass

References(105)

Figures(18)

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Nicole F. Bell
(
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)
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Yi Cai
(
- Melbourne U.
)
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James B. Dent
(
- U. Louisiana, Lafayette, Dept. Phys.
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[17]

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Nicole F. Bell
(
- Melbourne U.
)
,
Yi Cai
(
- Melbourne U.
)
,
James B. Dent
(
- U. Louisiana, Lafayette, Dept. Phys.
)
,
Rebecca K. Leane
(
- Melbourne U.
)
,
Thomas J. Weiler
(
- Vanderbilt U.
)

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•
e-Print:
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[18]

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•
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•
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