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Photoproduction of Doubly Heavy Baryon at the LHeC | | Bi Huan-Yu
; Zhang Ren-You
; Xing-Gang Wu
; Ma Wen-Gan
; Li Xiao-Zhou
; Samuel Owusu
; | | Date: |
23 Feb 2017 | | Abstract: | The photoproduction of doubly heavy baryon, $Xi_{cc}$, $Xi_{bc}$ and
$Xi_{bb}$, is predicted within the nonrelativistic QCD at the Large Hadron
Electron Collider (LHeC). The $Xi_{QQ’}$ production via the photon-gluon
fusing channel $gamma + g o langle{QQ’}
angle[n] +ar{Q} +ar{Q’}$ and
the extrinsic heavy quark channel $gamma + Q o
langle{QQ’}
angle[n]+ar{Q’}$ have been considered, where $Q$ or $Q’$ stand
for heavy $c$ or $b$ quark and $langle{QQ’}
angle[n]$ stands for a $QQ’$
diquark with given spin- and color- configurations $[n]$. The diquark shall
fragmentate into $Xi_{QQ’}$ baryon with high probability. For $Xi_{cc}$ and
$Xi_{bb}$ production, $[n]$ equals $[^1S_0]_{ extbf{6}}$ (in configurations
spin-singlet $^1S_0$-wave and color-sextuplet $ extbf{6}$) or
$[^3S_1]_{ar{ extbf{3}}}$ (in configurations spin-triplet $^3S_1$-wave and
color-antitriplet $ar{ extbf{3}}$) and for $Xi_{bc}$ production, $[n]$
equals $[^1S_0]_{ar{ extbf{3}}}$, $[^1S_0]_{{ extbf{6}}}$,
$[^3S_1]_{ar{ extbf{3}}}$ or $[^3S_1]_{ extbf{6}}$. A detailed comparison
of those channels and configurations on total and differential cross sections,
together with their uncertainties, is presented. We find the dominate
contributions for $Xi_{QQ’}$ production are from extrinsic heavy quark channel
and for $[^3S_1]_{ar{ extbf{3}}}$ configuration; While other diquark states
can also provide sizable contributions to the $Xi_{QQ’}$ production. As a
combination of all the mentioned channels and configurations and by taking
$m_c=1.80pm0.10$ GeV and $m_b=5.1pm0.20$ GeV, we observe that
$(6.70^{+1.40}_{-1.10}) imes 10^{3}$ $Xi_{bb}$, $(8.81^{+3.08}_{-2.20}) imes
10^{6}$ $Xi_{cc}$ and $(4.63^{+1.21}_{-0.92}) imes 10^{5}$ $Xi_{bc}$ events
can be generated at the LHeC in one operation year. | | Source: | arXiv, 1702.7181 | | Services: | Forum | Review | PDF | Favorites | |
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