Abstract
We present a detailed discussion on the doubly charmed baryon Xi _{cc} production at the RHIC and LHC via the proton–nucleus (p–N) and nucleus–nucleus (N–N) collision modes. The extrinsic charm mechanism via the subprocesses g+crightarrow (cc)[n]+bar{c} and c+crightarrow (cc)[n]+g together with the gluon-gluon fusion mechanism via the subprocess g+grightarrow (cc)[n]+bar{c}+bar{c} have been taken into consideration, where the intermediate diquark is in [n]=[^1S_0]_mathbf{6}-state or [^3S_1]_{bar{mathbf{3}}}-state, respectively. Total and differential cross sections have been discussed under various collision energies. To compare with the Xi _{cc} production via proton-proton collision mode at the LHC, we observe that sizable Xi _{cc} events can also be generated via p–N and N–N collision modes at the RHIC and LHC. For examples, about 8.1times 10^7 and 6.7times 10^7Xi _{cc} events can be accumulated in p-Pb and Pb-Pb collision modes at the LHC within one operation year.
Highlights
Within the quark model, the doubly heavy baryon is regarded as a three quark state with two heavy quarks (c or b) and a light quark q (q = u, d, s) [1,2,3,4,5]
We have studied the cc production via p–N and N–N collisions at the Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC)
Our results show that in addition to the gluon-gluon fusion mechanism, the extrinsic charm mechanisms via g + c and c + c subprocesses, are important to achieve a sound prediction for the cc production
Summary
Throughout the paper, we adopt QQ as short notation for the baryon QQ q , where Q and Q stand for the heavy c or b quark, respectively This stimulates many new works, either experimentally or theoretically, for the doubly heavy baryons. Through highenergy p–N and N–N collisions, the generated heavy quarks will either combine and evolve into doubly heavy baryon before QGP formation or hadronize into colorless baryons via the transition from the QGP phase to the hadronic phase. This makes the production of via the p–N and N–N modes quite different from the usual pp-collision mode.
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