Photoproduction of doubly heavy baryon at the ILC - INSPIRE

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Photoproduction of doubly heavy baryon at the ILC

Aug 20, 2014

6 pages

Published in:

JHEP 12 (2014) 018

Published: Dec 3, 2014

e-Print:

1408.4615 [hep-ph]

DOI:

10.1007/JHEP12(2014)018

View in:

ADS Abstract Service

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Abstract: (Springer)

In the present paper, we make a detailed study on the doubly heavy baryon photoproduction in the future e

^{+}

e

^{−}

International Linear Collider (ILC). The baryons Ξ

_{cc}

, Ξ

_{bc}

, and Ξ

_{bb}

are produced via the channel

\gamma \gamma \to {\Xi}_{QQ\prime }+\overline{Q}^{\prime }+\overline{Q}

, where Q and Q′ stand for heavy c or b quark, respectively. As for the Ξ

_{QQ}

′-baryon production, it shall first generate a (QQ′)[n]-diquark and then form the final baryon via fragmentation, where [n] stands for the color- and spin- configurations for the (QQ′)-diquark states. According to the non-relativistic QCD theory, four diquark configurations shall provide sizable contributions to the baryon production, e.g., [n] equals

{\left[{}^3{S}_1\right]}_{\overline{3}},\,{\left[{}^1{S}_0\right]}_6,\,{\left[{}^3{S}_1\right]}_6,\,\mathrm{or}\kern0.37em {\left[{}^1{S}_0\right]}_{\overline{3}}

, respectively. We adopt the improved helicity amplitude approach for the hard scattering amplitude to improve the calculation efficiency. Total and differential cross sections of those channels, as well as the theoretical uncertainties, are presented. We show that sizable amounts of baryon events can be generated at the ILC, i.e., about 2.0 × 106 Ξ

_{cc}

, 2.2 × 10

^{5}

Ξ

_{bc}

, as well as 3.0 × 10

^{3}

Ξ

_{bb}

events are to be generated in one operation year for

\sqrt{S}=500

GeV and ℒ ≃ 10

^{36}

cm

^{−2}

s

^{−1}

.

Note:

8 pages, 6 figures. Discussions improved and references updated. To be published in JHEP

QCD Phenomenology
Phenomenological Models
baryon: heavy
baryon: photoproduction
baryon: production
quantum chromodynamics: nonrelativistic
helicity: amplitude analysis
ILC Coll
differential cross section
scattering amplitude

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