Resolving the SELEX\u2013LHCb double-charm baryon conflict: the impact of intrinsic heavy-quark hadroproduction and supersymmetric light-front holographic QCD

S. J. Brodsky,S. Groote,S. Koshkarev

doi:10.1140/epjc/s10052-018-5955-1

S. J. Brodsky, S. Groote + Show 1 more

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https://doi.org/10.1140/epjc/s10052-018-5955-1

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Abstract

In this paper we show that the intrinsic heavy-quark QCD mechanism for the hadroproduction of heavy hadrons at large x_F can resolve the apparent conflict between measurements of double-charm baryons by the SELEX fixed-target experiment and the LHCb experiment at the LHC collider. We show that in fact both experiments are compatible, and that both can be correct. The observed spectroscopy of double-charm hadrons is in agreement with the predictions of supersymmetric light front holographic QCD.

Highlights

The first experimental evidence for the existence of doublecharm baryons was published by the SELEX collaboration
SELEX and LHCb we will utilize the predictions of the supersymmetric light front holographic QCD (SUSY LFHQCD)
Using both theoretical and experimental arguments, we have shown that the SELEX and the LHCb results for the production of doubly charmed baryons can both be correct

Summary

Introduction

15 years ago [1,2,3,4,5,6]. By utilizing the Fermilab negative and positive charged beams at 600 GeV/c to produce charmed particles in a thin foil of copper or on a diamond target, the SELEX collaboration observed two different decay channels for the |dcc state at a mass close to 3520 MeV/c2. In QED, positronium has an analogous |e+e−μ+μ− Fock state due to the insertion of light-bylight scattering in the positronium self-energy amplitude In such an “intrinsic charm” Fock state |uudcc , the maximum kinematic configuration occurs at minimum invariant mass, where all quarks are at rest in the hadron’s rest frame; i.e., at equal rapidity in the moving hadron. The operator product expansion predicts that the probability of intrinsic heavy-quark Fock states |uud Q Qto scale as If such a Fock state interacts in a hadronic collision, the comoving udc of the projectile proton can readily coalesce. It is natural to hadro-produce a double-charm baryon |qcc at high xF from the materialization of the double-intrinsic charm |uudcccc Fock state of the projectile proton, since the qcc quarks can coalesce at the same rapidity [21]. In this paper we review the hadroproduction mechanisms of double-charm baryons for the different experimental environments and reinterpret the SELEX and LHCb results

Production rate and the kinematics of the

Mass difference

Suppression of the radiative decay

Findings

Summary