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Semileptonic decays of anti-triplet charmed baryons
/ Geng, Chao-Qiang ; Liu, Chia-Wei ; Tsai, Tien-Hsueh ; Yeh, Shu-Wei
We study the semileptonic decays Bc→Bnℓ+νℓ where Bc(n) is the anti-triplet-charmed (octet) baryon with the SU(3)f flavor symmetry and helicity formalism. [...]
Published in Physics letters B 792 (2019) 214-218
10.1016/j.physletb.2019.03.056
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Matter power spectra in viable f ( R ) gravity models with dynamical background
/ Chen, Yow-Chun ; Geng, Chao-Qiang ; Lee, Chung-Chi ; Yu, Hongwei
We study the matter power spectra in the viable f ( R ) gravity models with the dynamical background evolution and linear perturbation theory by using the CosmoMC package. [...]
Published in EPJC 79 (2019) 93
10.1140/epjc/s10052-019-6613-y
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Singly Cabibbo suppressed decays of Λc+ with SU(3) flavor symmetry
/ Geng, Chao-Qiang ; Liu, Chia-Wei ; Tsai, Tien-Hsueh
We analyze the weak processes of anti-triplet charmed baryons decaying to octet baryons and mesons with the SU(3) flavor symmetry and topological quark diagram scheme. [...]
Published in Physics letters B 790 (2019) 225-228
10.1016/j.physletb.2019.01.025
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A model with flavor-dependent gauged symmetrySupported by National Center for Theoretical Sciences and MoST (MoST-104-2112-M-007-003-MY3 and MoST-107-2119-M-007-013-MY3)
/ Mu, Linping ; Okada, Hiroshi ; Geng, Chao-Qiang
We propose a new model with flavor-dependent gauged symmetry in addition to the flavor-blind symmetry in the Standard Model. [...]
Published in Chinese Phys. C 42 (2018) 123106
10.1088/1674-1137/42/12/123106
arXiv:1803.05633
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LHC searches for top-philic Kaluza-Klein graviton
/ Geng, Chao-Qiang ; Huang, Da ; Yamashita, Kimiko
We study the phenomenology of a massive graviton G with non-universal couplings to the Standard Model (SM) particles. [...]
Published in JHEP 1810 (2018) 046
10.1007/JHEP10(2018)046
arXiv:1807.09643
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Large ν ‐ ν ¯ $$ \nu \hbox{-} \overline{\nu} $$ oscillations from high-dimensional lepton number violating operator
/ Geng, Chao-Qiang ; Huang, Da
It is usually believed that the observation of the neutrino-antineutrino ( ν ‐ ν ¯ $$ \nu \hbox{-} \overline{\nu} $$ ) oscillations is almost impossible since the oscillation probabilities are expected to be greatly suppressed by the square of tiny ratio of neutrino masses to energies. [...]
Published in JHEP 1703 (2017) 103
10.1007/JHEP03(2017)103
arXiv:1612.03721
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Probing gravitational non-minimal coupling with dark energy surveys
/ Geng, Chao-Qiang ; Lee, Chung-Chi ; Wu, Yi-Peng
We investigate observational constraints on a specific one-parameter extension to the minimal quintessence model, where the quintessence field acquires a quadratic coupling to the scalar curvature through a coupling constant ξ . [...]
Published in EPJC 77 (2017) 162
10.1140/epjc/s10052-017-4720-1
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Branching fractions of B(c) decays involving J/ψ and X(3872)Supported in part by National Center for Theoretical Sciences, National Science Council (NSC-101-2112-M-007-006-MY3), MoST (MoST-104-2112-M-007-003-MY3) National Science Foundation of China (11675030)
/ Hsiao, Y. K. ; Geng, Chao-Qiang
We study two-body B(c) → Mc(π,K) and semileptonic decays with , where is regarded as the tetraquark state cc̄uū(dd̄). [...]
Published in Chinese Phys. C 41 (2017) 013101
10.1088/1674-1137/41/1/013101
arXiv:1607.02718
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Direct detection of exothermic dark matter with light mediator
/ Geng, Chao-Qiang ; Huang, Da ; Lee, Chun-Hao ; Wang, Qing
We study the dark matter (DM) direct detection for the models with the effects of the isospin-violating couplings, exothermic scatterings, and/or the lightness of the mediator, proposed to relax the tension between the CDMS-Si signals and null experiments. [...]
Published in JCAP 1608 (2016) 009
10.1088/1475-7516/2016/08/009
arXiv:1605.05098
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Running cosmological constant with observational tests
/ Geng, Chao-Qiang ; Lee, Chung-Chi ; Zhang, Kaituo
We investigate the running cosmological constant model with dark energy linearly proportional to the Hubble parameter, Λ=σH+Λ0 , in which the ΛCDM limit is recovered by taking σ=0 . [...]
Published in Physics letters B (2016)
10.1016/j.physletb.2016.07.026
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