GENXICC2.0: An upgraded version of the generator for hadronic production of double heavy baryons ΞccΞcc, ΞbcΞbc and ΞbbΞbb

Department of Physics, Chongqing University, Chongqing 400044, China
Computer Physics Communications (Impact Factor: 2.41). 06/2010; 181(6):1144-1149. DOI: 10.1016/j.cpc.2010.02.008
Source: arXiv

ABSTRACT An upgraded (second) version of the package GENXICC ({\bf A Generator for Hadronic Production of the Double Heavy Baryons $\Xi_{cc}$, $\Xi_{bc}$ and $\Xi_{bb}$ by C.H. Chang, J.X. Wang and X.G. Wu,} [its first version: in Comput. Phys. Commun. {\bf 177} (2007) 467-478]) is presented. Users, with this version being implemented in PYTHIA and a GNU C compiler, may simulate full events of the production in various experimental environments conveniently. In comparison with the previous version, in order to implement it in PYTHIA properly, a subprogram for the fragmentation of the produced double heavy diquark to the relevant baryon is complemented and the interphase of the generator to PYTHIA is changed accordingly. In the subprogram, with explanation, certain necessary assumptions (approximations) are made so as to conserve the momenta and the QCD `color' flow for the fragmentation. Comment: 15 pages, 2 figures

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    ABSTRACT: We present a detailed discussion on the hadronic production of $\Xi_{cc}$ at a fixed target experiment at the LHC (After@LHC). It is produced via the channel ${\rm Proton} + {\rm Proton}\to\Xi_{cc}+X$, whose subprocesses include $g+g\to \Xi_{cc} +\bar{c} +\bar{c}$, $g+c\to \Xi_{cc}+\bar{c}$, and $c+c\to \Xi_{cc}+g$. The $\Xi_{cc}$ can be produced via a binding diquark first and then by grabbing soft light-quarks or gluons. Both two diquark configurations $(cc)[^3S_1]_{\bf\bar 3}$ and $(cc)[^1S_0]_{\bf 6}$ have sizable contributions to $\Xi_{cc}$ production. We show that large number of $\Xi_{cc}$ events can be generated at the After@LHC, whose total production cross section is larger than that of SELEX by about thirty-five times. It is even possible to study the properties of $\Xi_{bc}$. That is, about $8.3 \times 10^6$ $\Xi_{cc}$ events/year and $1.8 \times 10^4$ $\Xi_{bc}$ events/year can be generated when the integrated luminosity equals $2$ fb$^{-1}$/year. Thus, in addition to the hadronic experiments SELEX and LHC itself, the After@LHC can also provide a useful platform for studying the baryon properties and has its own advantages.
    Physical Review D 01/2014; 89(7). DOI:10.1103/PhysRevD.89.074020 · 4.86 Impact Factor
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    ABSTRACT: Considering the inclusive process, we study the doubly heavy baryon Ξcc (Ξbb) production through e+e− annihilation. Both the diquark QQ in color sextet and triplet are discussed. The results show that the contributions from these two color states play equally important roles. At the Z0 pole, a significant enhancement can be found in the doubly heavy baryon production.
    Chinese Physics Letters 05/2014; 31(5):051301. DOI:10.1088/0256-307X/31/5/051301 · 0.92 Impact Factor
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    ABSTRACT: The inclusive production of the doubly heavy baryon Ξbb is investigated with a polarized and unpolarized photon collider. The bb pair in both a color triplet and sextet has been considered to transform into Ξbb. The results indicate that the contribution from the color sextet is about 8% for Ξbb production. For the international linear collider collision energy ranging from 91 GeV to 1000 GeV, the total cross section of Ξbb shows a downtrend, i.e., the production of Ξbb has the maximal rate at √S = 91 GeV. Our results indicate that the initial beam polarization may be an important asset for the production of Ξbb. At some collision point, the production rate of Ξbb can be increased by about 17% with an appropriate choice of the initial beam polarization.
    Chinese Physics Letters 09/2014; 31(9):091301. DOI:10.1088/0256-307X/31/9/091301 · 0.92 Impact Factor

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