Abstract
Gauge invariance of QCD dictates the presence of string junctions in the wave functions of baryons. In high-energy inclusive processes, these baryon junctions have been predicted to induce the separation of the flows of baryon number and flavor. In this paper we describe this phenomenon using the analog-gas model of multiparticle production proposed long time ago by Feynman and Wilson and adapted here to accommodate the topological expansion in QCD. In this framework, duality arguments suggest the existence of two degenerate junction-antijunction glueball Regge trajectories of opposite \( \mathcal{C} \)-parity with intercept close to 1/2. The corresponding results for the energy and rapidity dependence of baryon stopping are in reasonably good agreement with recent experimental findings from STAR and ALICE experiments. We show that accounting for correlations between the fragmenting strings further improves agreement with the data, and outline additional experimental tests of our picture at the existing (RHIC, LHC, JLab) and future (EIC) facilities.
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References
G.C. Rossi and G. Veneziano, A Possible Description of Baryon Dynamics in Dual and Gauge Theories, Nucl. Phys. B 123 (1977) 507 [INSPIRE].
E. Witten, Baryons and branes in anti-de Sitter space, JHEP 07 (1998) 006 [hep-th/9805112] [INSPIRE].
G. Rossi and G. Veneziano, The string-junction picture of multiquark states: an update, JHEP 06 (2016) 041 [arXiv:1603.05830] [INSPIRE].
F. Bissey et al., Gluon flux-tube distribution and linear confinement in baryons, Phys. Rev. D 76 (2007) 114512 [hep-lat/0606016] [INSPIRE].
L. Montanet, G.C. Rossi and G. Veneziano, Baryonium Physics, Phys. Rept. 63 (1980) 149 [INSPIRE].
D. Kharzeev, Can gluons trace baryon number?, Phys. Lett. B 378 (1996) 238 [nucl-th/9602027] [INSPIRE].
S.M. Girvin and K. Yang, Modern Condensed Matter Physics, Cambridge University Press (2019).
A.H. Mueller, O(2,1) Analysis of Single Particle Spectra at High-energy, Phys. Rev. D 2 (1970) 2963 [INSPIRE].
O.V. Kancheli, Inelastic differential cross sections at high energies and duality, JETP Lett. 11 (1970) 267 [INSPIRE].
N. Lewis et al., Search for baryon junctions in photonuclear processes and isobar collisions at RHIC, Eur. Phys. J. C 84 (2024) 590 [arXiv:2205.05685] [INSPIRE].
Particle Data Group collaboration, Review of Particle Physics, PTEP 2022 (2022) 083C01 [INSPIRE].
G. Veneziano, Origin and intercept of the Pomeranchuk singularity, Phys. Lett. B 43 (1973) 413 [INSPIRE].
G. Veneziano, Large N Expansion in Dual Models, Phys. Lett. B 52 (1974) 220 [INSPIRE].
R.P. Feynman, Very high-energy collisions of hadrons, Phys. Rev. Lett. 23 (1969) 1415 [INSPIRE].
R.P. Feynman, The Behavior of Hadron Collisions at Extreme Energies, 3rd International Conference on High Energy Collisions, 5-6 September 1969, Stony Brook, NY Conf. Proc. C 690905 (1969) 237 [INSPIRE].
D. Amati, A. Stanghellini and S. Fubini, Theory of high-energy scattering and multiple production, Nuovo Cim. 26 (1962) 896 [INSPIRE].
K.G. Wilson, Regge poles and multiple production, Acta Phys. Austriaca 17 (1963) 37 [INSPIRE].
K.G. Wilson, Some experiments on multiple production, CLNS-131 (1970) [INSPIRE].
G. ’t Hooft, A Planar Diagram Theory for Strong Interactions, Nucl. Phys. B 72 (1974) 461 [INSPIRE].
G. Veneziano, Some Aspects of a Unified Approach to Gauge, Dual and Gribov Theories, Nucl. Phys. B 117 (1976) 519 [INSPIRE].
G.F. Chew and A. Pignotti, Multiperipheral bootstrap model, Phys. Rev. 176 (1968) 2112 [INSPIRE].
H. Lee, How to generate the Pomeranchukon from the background in a dual multiperipheral model, Phys. Rev. Lett. 30 (1973) 719 [INSPIRE].
Y. Chen et al., Glueball spectrum and matrix elements on anisotropic lattices, Phys. Rev. D 73 (2006) 014516 [hep-lat/0510074] [INSPIRE].
Particle Data Group collaboration, Review of Particle Physics, Chin. Phys. C 38 (2014) 090001 [INSPIRE].
V.A. Novikov et al., Charmonium and Gluons: Basic Experimental Facts and Theoretical Introduction, Phys. Rept. 41 (1978) 1 [INSPIRE].
D. Frenklakh, D.E. Kharzeev and W. Li, Signatures of baryon junctions in semi-inclusive deep inelastic scattering, Phys. Lett. B 853 (2024) 138680 [arXiv:2312.15039] [INSPIRE].
C.E. DeTar, D.Z. Freedman and G. Veneziano, Sum rules for inclusive cross-sections, Phys. Rev. D 4 (1971) 906 [INSPIRE].
Acknowledgments
This work was supported in part by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, Grants No. DE-FG88ER41450 (DF, DK) and DE-SC0012704 (DK). GCR acknowledges partial financial support from INFN IS Lcd123.
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Frenklakh, D., Kharzeev, D., Rossi, G. et al. Baryon-number — flavor separation in the topological expansion of QCD. J. High Energ. Phys. 2024, 262 (2024). https://doi.org/10.1007/JHEP07(2024)262
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DOI: https://doi.org/10.1007/JHEP07(2024)262