arXiv subjects

Long-Bin Chen

Publications and source records attributed to Long-Bin Chen.

39 records · Page 3Linked to original sources

arXiv2014

NLO corrections to $χ_{bJ}$ to two-$J/ψ$ exclusive decay processes

The next-to-leading order QCD corrections for $χ_{bJ}$, the p-wave bottomonium, to $J/ψ$ pair decay processes are evaluated utilizing NRQCD factorization formalism. The scale dependence of $χ_{b2}\rightarrow J/ψJ/ψ$ process is depressed with NLO corrections, and hence the uncertainties in the leading order results are greatly reduced. The total branch ratios are found to be the order of $10^{-5}$ for all three $χ_{bJ}\rightarrow J/ψJ/ψ$ processes, indicating that they are observable in the LHC and super-B experiments.

hep-ph↗

arXiv2013

Reconstructing the 125 GeV SM Higgs Boson Through $\ell\bar{\ell}γ$

To ascertain the new boson with mass near 125 {GeV} observed recently by ATLAS and CMS Collaborations to be the Standard Model Higgs, and to determine its intrinsic properties, more measurements on its various decay channels are still necessary. In this work we reanalyze the processes of the Standard Model Higgs radiative decays to lepton pairs. We find that when photon and leptons are hard, that is possessing energies larger than 1 {GeV}, the branching fractions of $H\rightarrow \ell\bar{\ell}γ(\ell=e~or~μ)$ processes are about two-thirds of the $H\rightarrowμ^+μ^-$ process. Since the lepton-pair yields of the radiative processes mainly come from the Z-boson conversion, which will greatly suppress the backgrounds, we believe the signal should be observable in presently accumulated data or in the next run of the LHC experiment, provided the Standard Model Higgs is indeed light.

hep-ph↗

arXiv2012

P-wave Quarkonium Decays to Meson Pairs

The processes of P-wave Quarkonium exclusive decays to two mesons are investigated, in which the final state vector mesons with various polarizations are considered separately. In the calculation, the initial heavy quarkonia are treated in the framework of non-relativistic quantum chromodynamics, whereas for light mesons, the light cone distribution amplitudes up to twist-3 are employed. It turns out that the higher twist contribution is significant and provides a possible explanation for the observation of the hadron helicity selection rule violated processes $χ_{c1}\rightarrow ϕϕ,ωω$ by the BESIII collaboration in recently. We also evaluate the $χ_{b1}\to J/ψJ/ψ$ process and find that its branching ratio is big enough to be measured at the B-factories.

hep-ph↗