scholarly journals Lattice calculation of composite dark matter form factors

2013 ◽  
Vol 88 (1) ◽  
Author(s):  
T. Appelquist ◽  
R. C. Brower ◽  
M. I. Buchoff ◽  
M. Cheng ◽  
S. D. Cohen ◽  
...  
Keyword(s):  
Dark Matter ◽  
Form Factors ◽  
Lattice Calculation

Lattice calculation of meson form factors for semi-leptonic decays

1989 ◽  
Vol 9 ◽  
pp. 186-192 ◽  
Author(s):  
Claude Bernard ◽  
Aida El-Khadra ◽  
Amarjit Soni
Keyword(s):  
Form Factors ◽  
Lattice Calculation ◽  
Leptonic Decays

Lattice calculation of baryonic electromagnetic form factors

1991 ◽  
Vol 527 ◽  
pp. 531-534 ◽  
Author(s):  
Terrence Draper ◽  
Keh-Fei Liu ◽  
D.B. Leinweber ◽  
R.M. Woloshyn
Keyword(s):  
Form Factors ◽  
Electromagnetic Form Factors ◽  
Lattice Calculation

scholarly journals Lattice calculation of pion form factors with overlap fermions

2021 ◽  
Vol 104 (7) ◽  
Author(s):  
Gen Wang ◽  
Jian Liang ◽  
Terrence Draper ◽  
Keh-Fei Liu ◽  
Yi-Bo Yang ◽  
...  
Keyword(s):  
Form Factors ◽  
Lattice Calculation

scholarly journals Two-photon exchange in leptophilic dark matter scenarios

2021 ◽  
Vol 2021 (12) ◽  
Author(s):  
Raghuveer Garani ◽  
Federico Gasparotto ◽  
Pierpaolo Mastrolia ◽  
Henrik J. Munch ◽  
Sergio Palomares-Ruiz ◽  
...  
Keyword(s):  
Dark Matter ◽  
Momentum Transfer ◽  
Direct Detection ◽  
Form Factors ◽  
Scalar Particle ◽  
Analytical Form ◽  
Photon Exchange ◽  
Two Photon ◽  
Zero Momentum ◽  
Pseudo Scalar

Abstract In leptophilic scenarios, dark matter interactions with nuclei, relevant for direct detection experiments and for the capture by celestial objects, could only occur via loop-induced processes. If the mediator is a scalar or pseudo-scalar particle, which only couples to leptons, the dominant contribution to dark matter-nucleus scattering would take place via two-photon exchange with a lepton triangle loop. The corresponding diagrams have been estimated in the literature under different approximations. Here, we present new analytical calculations for one-body two-loop and two-body one-loop interactions. The two-loop form factors are presented in closed analytical form in terms of generalized polylogarithms up to weight four. In both cases, we consider the exact dependence on all the involved scales, and study the dependence on the momentum transfer. We show that some previous approximations fail to correctly predict the scattering cross section by several orders of magnitude. Moreover, we quantitatively show that form factors in the range of momentum transfer relevant for local galactic dark matter, can be significantly smaller than their value at zero momentum transfer, which is the approach usually considered.

scholarly journals First lattice calculation of charmed hadrons' electromagnetic form factors

2014 ◽  
Vol 562 ◽  
pp. 012009 ◽  
Author(s):  
K U Can ◽  
G Erkol ◽  
B Isildak ◽  
M Oka ◽  
T T Takahashi
Keyword(s):  
Form Factors ◽  
Electromagnetic Form Factors ◽  
Lattice Calculation

scholarly journals Improved treatment of dark matter capture in neutron stars III: nucleon and exotic targets

2021 ◽  
Vol 2021 (11) ◽  
pp. 056
Author(s):  
Filippo Anzuini ◽  
Nicole F. Bell ◽  
Giorgio Busoni ◽  
Theo F. Motta ◽  
Sandra Robles ◽  
...  
Keyword(s):  
Dark Matter ◽  
Neutron Star ◽  
Neutron Stars ◽  
Capture Rate ◽  
Form Factors ◽  
Mass Range ◽  
Strong Interactions ◽  
Dependent Form ◽  
Free Fermi ◽  
Total Capture

Abstract We consider the capture of dark matter (DM) in neutron stars via scattering on hadronic targets, including neutrons, protons and hyperons. We extend previous analyses by including momentum dependent form factors, which account for hadronic structure, and incorporating the effect of baryon strong interactions in the dense neutron star interior, rather than modelling the baryons as a free Fermi gas. The combination of these effects suppresses the DM capture rate over a wide mass range, thus increasing the cross section for which the capture rate saturates the geometric limit. In addition, variation in the capture rate associated with the choice of neutron star equation of state is reduced. For proton targets, the use of the interacting baryon approach to obtain the correct Fermi energy is essential for an accurate evaluation of the capture rate in the Pauli-blocked regime. For heavy neutron stars, which are expected to contain exotic matter, we identify cases where DM scattering on hyperons contributes significantly to the total capture rate. Despite smaller neutron star capture rates, compared to existing analyses, we find that the projected DM-nucleon scattering sensitivity greatly exceeds that of nuclear recoil experiments for a wide DM mass range.

scholarly journals Recasting direct detection limits within micrOMEGAs and implication for non-standard dark matter scenarios

2021 ◽  
Vol 81 (3) ◽  
Author(s):  
G. Bélanger ◽  
A. Mjallal ◽  
A. Pukhov
Keyword(s):  
Dark Matter ◽  
Elastic Scattering ◽  
Velocity Distribution ◽  
Cross Sections ◽  
Direct Detection ◽  
Cosmological Parameters ◽  
Form Factors ◽  
Scattering Cross ◽  
Upper Limits ◽  
Scattering Cross Sections

AbstractDirect detection experiments obtain 90% upper limits on the elastic scattering cross sections of dark matter with nucleons assuming point-like interactions and standard astrophysical and cosmological parameters. In this paper we provide a recasting of the limits from XENON1T, PICO-60, CRESST-III and DarkSide-50 and include them in micrOMEGAs. The code can then be used to directly impose constraints from these experiments on generic dark matter models under different assumptions about the DM velocity distribution or on the nucleus form factors. Moreover, new limits on the elastic scattering cross sections can be obtained in the presence of a light t-channel mediator or of millicharged particles.

Lattice calculation of nucleon axial form factors

1991 ◽  
Vol 20 ◽  
pp. 467-471 ◽  
Author(s):  
Keh-Fei Liu ◽  
Ji-Min Wu ◽  
Shao-Jing Dong ◽  
Walter Wilcox
Keyword(s):  
Form Factors ◽  
Lattice Calculation ◽  
Axial Form

scholarly journals Novel Neutrino-Floor and Dark Matter Searches with Deformed Shell Model Calculations

2018 ◽  
Vol 2018 ◽  
pp. 1-17 ◽  
Author(s):  
D. K. Papoulias ◽  
R. Sahu ◽  
T. S. Kosmas ◽  
V. K. B. Kota ◽  
B. Nayak
Keyword(s):  
Dark Matter ◽  
Shell Model ◽  
Particle Physics ◽  
Magnetic Moments ◽  
Form Factors ◽  
Detection Rates ◽  
Model Calculations ◽  
Hartree Fock ◽  
The Impact ◽  
Direct Dark Matter

Event detection rates for WIMP-nucleus interactions are calculated for  71Ga,  73Ge,  75As, and  127I (direct dark matter detectors). The nuclear structure form factors, which are rather independent of the underlying beyond the Standard Model particle physics scenario assumed, are evaluated within the context of the deformed nuclear shell model (DSM) based on Hartree-Fock nuclear states. Along with the previously published DSM results for  73Ge, the neutrino-floor due to coherent elastic neutrino-nucleus scattering (CEνNS), an important source of background to dark matter searches, is extensively calculated. The impact of new contributions to CEνNS due to neutrino magnetic moments and Z′ mediators at direct dark matter detection experiments is also examined and discussed. The results show that the neutrino-floor constitutes a crucial source of background events for multi-ton scale detectors with sub-keV capabilities.

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