3,994 research outputs found
Exploring Bosonic Mediator of Interaction at BESIII
We present a comprehensive investigation on the possibility of the search for
new force mediator boson in collision and decay at the
BESIII experiment. The typical interactions of boson coupling to leptons
and quarks are explored. The production and decay properties of this
particle, the product/decay chains and
, and exclusion limits on the reduced
coupling strength parameters as functions of boson mass are presented. With
the data set of tens of fb or , we find that the
exclusion limits on the coupling strength parameters fall in the range of
, depending on assuming the decay width 10
eV100 eV reasonably, for various hypotheses in the literature.
According to our estimation, the search for new force mediator boson in
both collision and decay are accessible in nowadays BESIII
experiment.Comment: To appear in EPJC; 26 pages, 13 figures; Fig.s (5, 6, 9, 11, 12, 13)
are reploted and their discussion are updated; three paragraphs, two
equations and 1 table are added; two errors are correcte
Ds+ -- Ds- Asymmetry in Photoproduction
Considering of the possible difference in strange and antistrange quark
distributions inside nucleon, we investigate the Ds+ -- Ds- asymmetry in
photoproduction in the framework of heavy-quark recombination mechanism. We
adopt two distribution models of strange sea, those are the light-cone
meson-baryon fluctuation model and the effective chiral quark model. Our
results show that the asymmetry induced by the strange quark distributions is
distinct, which is measurable in experiments. And, there are evident
differences between the predictions of our calculation and previous estimation.
Therefore, the experimental measurements on the Ds+ -- Ds- asymmetry may impose
a unique restriction on the strange-antistrange distribution asymmetry models.Comment: 11 page, 5 figure
Asymmetry in Photoproduction
By adopting two models of strange and antistrange quark distributions inside
nucleon, the light-cone meson-baryon fluctuation model and the effective chiral
quark model, we calculate the asymmetry in photoproduction in
the framework of heavy-quark recombination mechanism. We find that the effect
of asymmetry of strange sea to the asymmetry is considerable and
depending on the different models. Therefore, we expect that with the further
study in electroproduction, e.g. at HERA and CEBAF, the experimental
measurements on the asymmetry may impose a strong restriction
on the strange-antistrange distribution asymmetry models.Comment: 4 pages, talk presented by I. Caprini at the International Conference
on QCD and Hadronic Physics, June 16-20 2005, Beijin
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