Intrinsic charm production of doubly charmed baryons: Collider vs. fixed-target

Journal Article · Tue Dec 24 00:00:00 EST 2019 · Science China. Physics, Mechanics & Astronomy

DOI:https://doi.org/10.1007/s11433-019-1496-7· OSTI ID:1608087

Vogt, Ramona ^[1]; Brodsky, Stanley J. ^[2]

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1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Davis, CA (United States)
2. SLAC National Accelerator Lab., Menlo Park, CA (United States)

We report the LHCb Collaboration has measured the doubly charmed baryon, $$\Xi^{++}_{cc} (ucc)$$, through two different decay channels in $p + p$ collisions at center-of-mass energies of 7, 8 and 13 TeV. While they have performed similar searches for the doubly charmed baryon $$\Xi^{+}_{cc} (dcc)$$, it has not yet been observed by LHCb. However, the fixed-target experiment, SELEX, at Fermilab, reported the observation of the $$\Xi^{+}_{cc}$$ in two different decay channels with a 600 GeV charged hyperon beam. The beam was composed of an admixture of $$π^{±}, p, \overline p $$ components as well as the $Σ^–$ hyperon. Much discussion has arisen over the fact that the fixed-target observations have not been easily reproduced by the collider experiments at higher energies, where one might have expected the production rates to be much higher due to the orders of magnitude increase in the center of mass energy with LHCb.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
• Grant/Contract Number: AC02-76SF00515; AC52-07NA27344
• OSTI ID: 1608087
• Report Number(s): LLNL-JRNL--797854-1; 1000073
• Journal Information: Science China. Physics, Mechanics & Astronomy, Journal Name: Science China. Physics, Mechanics & Astronomy Journal Issue: 2 Vol. 63; ISSN 1674-7348
• Publisher: Science China Press and Springer
• Country of Publication: United States
• Language: English

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