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Title: Uncertainties in WIMP dark matter scattering revisited

Abstract

We revisit the uncertainties in the calculation of spin-independent scattering matrix elements for the scattering of WIMP dark matter particles on nuclear matter. In addition to discussing the uncertainties due to limitations in our knowledge of the nucleonic matrix elements of the light quark scalar densities $$\langle$$N|$$\bar{u}$$u, $$\bar{d}$$d, $$\bar{s}$$s|N$$\rangle$$, we also discuss the importances of heavy quark scalar densities $$\langle$$N|$$\bar{c}$$c, $$\bar{b}$$b, $$\bar{t}$$t|N$$\rangle$$ and comment on uncertainties in quark mass ratios. We analyze estimates of the light-quark densities made over the past decade using lattice calculations and/or phenomenological inputs. We find an uncertainty in the combination $$\langle$$N|$$\bar{u}$$u, + $$\bar{d}$$d|N$$\rangle$$ that is larger than has been assumed in some phenomenological analyses, and a range of $$\langle$$N|$$\bar{s}s$$|N$$\rangle$$ that is smaller but compatible with earlier estimates. We also analyze the importance of the $$\mathcal{O}$$(α$$3\atop{s}$$) calculations of the heavy-quark matrix elements that are now available, which provide an important refinement of the calculation of the spin-independent scattering cross section. We use for illustration a benchmark CMSSM point in the focus-point region that is compatible with the limits from LHC and other searches.

Authors:
 [1];  [2];  [3]
  1. King's College London (United Kingdom); European Organization for Nuclear Research (CERN), Geneva (Switzerland); National Inst. of Chemical Physics and Biophysics, Tallinn (Estonia)
  2. Univ. of Tokyo (Japan)
  3. Univ. of Minnesota, Minneapolis, MN (United States)
Publication Date:
Research Org.:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1459721
Alternate Identifier(s):
OSTI ID: 1510043
Grant/Contract Number:  
SC0011842
Resource Type:
Published Article
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 78; Journal Issue: 7; Journal ID: ISSN 1434-6044
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Ellis, John, Nagata, Natsumi, and Olive, Keith A. Uncertainties in WIMP dark matter scattering revisited. United States: N. p., 2018. Web. doi:10.1140/epjc/s10052-018-6047-y.
Ellis, John, Nagata, Natsumi, & Olive, Keith A. Uncertainties in WIMP dark matter scattering revisited. United States. doi:10.1140/epjc/s10052-018-6047-y.
Ellis, John, Nagata, Natsumi, and Olive, Keith A. Wed . "Uncertainties in WIMP dark matter scattering revisited". United States. doi:10.1140/epjc/s10052-018-6047-y.
@article{osti_1459721,
title = {Uncertainties in WIMP dark matter scattering revisited},
author = {Ellis, John and Nagata, Natsumi and Olive, Keith A.},
abstractNote = {We revisit the uncertainties in the calculation of spin-independent scattering matrix elements for the scattering of WIMP dark matter particles on nuclear matter. In addition to discussing the uncertainties due to limitations in our knowledge of the nucleonic matrix elements of the light quark scalar densities $\langle$N|$\bar{u}$u, $\bar{d}$d, $\bar{s}$s|N$\rangle$, we also discuss the importances of heavy quark scalar densities $\langle$N|$\bar{c}$c, $\bar{b}$b, $\bar{t}$t|N$\rangle$ and comment on uncertainties in quark mass ratios. We analyze estimates of the light-quark densities made over the past decade using lattice calculations and/or phenomenological inputs. We find an uncertainty in the combination $\langle$N|$\bar{u}$u, + $\bar{d}$d|N$\rangle$ that is larger than has been assumed in some phenomenological analyses, and a range of $\langle$N|$\bar{s}s$|N$\rangle$ that is smaller but compatible with earlier estimates. We also analyze the importance of the $\mathcal{O}$(α$3\atop{s}$) calculations of the heavy-quark matrix elements that are now available, which provide an important refinement of the calculation of the spin-independent scattering cross section. We use for illustration a benchmark CMSSM point in the focus-point region that is compatible with the limits from LHC and other searches.},
doi = {10.1140/epjc/s10052-018-6047-y},
journal = {European Physical Journal. C, Particles and Fields},
number = 7,
volume = 78,
place = {United States},
year = {2018},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1140/epjc/s10052-018-6047-y

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    Works referencing / citing this record:

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