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Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Unveiling Light-Quark Yukawa Flavor Structure via Dihadron Fragmentation at Lepton Colliders
Qing-Hong Cao1,2,3, Xin-Kai Wen4,5, Bin Yan3,4
1Peking University, School of Physics, Beijing 100871, China.
Abstract:
Directly probing light-quark Yukawa couplings and their flavor structure remains a major challenge due to their smallness and overwhelming QCD backgrounds. In this Letter, we propose a theoretical framework to access these couplings at lepton colliders through transverse spin dependent azimuthal modulations in dihadron fragmentation. These modulations arise from the interference between Higgs mediated and standard model amplitudes in e^{-}e^{+}→qq[over ¯]Z, producing angular structures that are linearly sensitive to the Yukawa couplings y_{q}, in contrast to conventional observables that scale as y_{q}^{2}. By combining channels with an identified accompanying single hadron, h^{'}=π^{±},K^{±}, and p/p[over ¯], this approach cleanly disentangles the up- and down-quark Yukawa contributions, yielding typical limits at the O(10^{-4}-10^{-3}) level and establishing fragmentation dynamics as a novel and complementary probe of the Higgs flavor structure.
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