Mass splitting between charged and neutral winos at two-loop level

By M. Ibe, S. Matsumoto, R. Sato. 2012

197 citations recorded by the source corpus.

Abstract The recent result of the Higgs search at the LHC experiment has lead to more attention to the supersymmetric standard models with heavy sfermions. Among them, the models with the almost pure wino being the lightest supersymmetric particle (LSP) have been widely discussed due to their success in providing a consistent dark matter candidate. The notable phenomenological feature of the wino LSP is the degeneracy with its charged SU(2)L partner (the charged wino) in mass. The tiny mass splitting makes the charged wino long-lived, which allows us to detect the wino production at the LHC experiment by searching for the disappearing charged tracks inside the detectors. Since the reach of the experiment is sensitive to the mass splitting, it is mandatory to estimate it very precisely. We therefore perform a full calculation of the mass splitting at two-loop level, and find that the splitting is reduced by a few MeV compared to the one-loop calculation. This reduction leads to about a 10–30% longer lifetime of the charged wino, with which the current constraint on the wino mass by the ATLAS experiment is improved by about 10%.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/790866c73ee9ce3e1d1a74315b6ef9e490a3505e

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

In Nuclear and High Energy Physics

Citations in the corpus

In wino veritas? Indirect searches shed light on neutralino dark matter (2013, background): “16 GeV (calculated at two loops in [86]), which is much larger than the tree-level splitting.”
Neutralino dark matter at 14 TeV and 100 TeV (2014, background): “6 MeV in the large mass limit [83], though the mass splitting varies very”
Physics opportunities of a 100 TeV proton–proton collider (2015, background): “This irreducible splitting is ∆m = 166 MeV for winos [57] and ∆m = 355 MeV for higgsinos [58].”
Wino dark matter under siege (2013, background): “A 7 TeV LHC search for this signature [31] places a lower limit of ∼ 108 GeV on the wino mass [30].”
Search for electroweak production of supersymmetric states in scenarios with compressed mass spectra at √s = 13 TeV with the ATLAS detector (2017, unknown): “[19], and have masses of order one to tens of GeV larger”
Beyond the Standard Model Physics at the HL-LHC and HE-LHC (2018, background): “Its mass differs by ' 165 MeV [210] from the one of the charged components.”
Cosmological implications of Dark Matter bound states (2017, methodology): “where A = αem/r+α2c 2 We −MZr/r, B = α2e −MW r/r and ∆M is the mass splitting produced by electroweak symmetry breaking, equal to ∆M = 165 MeV at T = 0 (we use the two-loop result [29, 30]).”
Non-Abelian dark matter and dark radiation (2015, unknown): “In the limit Mχ MW the splitting is independent of Mχ and given by [24, 25] δMχ = Mχ± −Mχ0 ≈ 0.”