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

Brodsky, Stanley J.; Groote, S.; Koshkarev, Sergey

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

Cited by 23 publications

(14 citation statements)

References 36 publications

(40 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For more details, see refs. [34,37]. The effective supersymmetric properties of QCD can be used to identify the structure of the heavy quark mesons, baryons and tetraquark states [34].…”

Section: Supersymmetric Hadron Spectroscopy For Heavy Quarksmentioning

confidence: 99%

Supersymmetric and Conformal Features of Hadron Physics

Brodsky

2018

Universe

View full text Add to dashboard Cite

The QCD Lagrangian is based on quark and gluonic fields—not squarks nor gluinos. However, one can show that its hadronic eigensolutions conform to a representation of superconformal algebra, reflecting the underlying conformal symmetry of chiral QCD. The eigensolutions of superconformal algebra provide a unified Regge spectroscopy of meson, baryon, and tetraquarks of the same parity and twist as equal-mass members of the same 4-plet representation with a universal Regge slope. The predictions from light-front holography and superconformal algebra can also be extended to mesons, baryons, and tetraquarks with strange, charm and bottom quarks. The pion q q ¯ eigenstate has zero mass for m q = 0 . A key tool is the remarkable observation of de Alfaro, Fubini, and Furlan (dAFF) which shows how a mass scale can appear in the Hamiltonian and the equations of motion while retaining the conformal symmetry of the action. When one applies the dAFF procedure to chiral QCD, a mass scale κ appears which determines universal Regge slopes, hadron masses in the absence of the Higgs coupling. One also predicts the form of the nonperturbative QCD running coupling: α s ( Q 2 ) ∝ e - Q 2 / 4 κ 2 , in agreement with the effective charge determined from measurements of the Bjorken sum rule. One also obtains viable predictions for spacelike and timelike hadronic form factors, structure functions, distribution amplitudes, and transverse momentum distributions. The combination of conformal symmetry, light-front dynamics, its holographic mapping to AdS 5 space, and the dAFF procedure thus provide new insights, not only into the physics underlying color confinement, but also the nonperturbative QCD coupling and the QCD mass scale.

show abstract

“…For more details, see refs. [34,37]. The effective supersymmetric properties of QCD can be used to identify the structure of the heavy quark mesons, baryons and tetraquark states [34].…”

Section: Supersymmetric Hadron Spectroscopy For Heavy Quarksmentioning

confidence: 99%

Supersymmetric and Conformal Features of Hadron Physics

Brodsky

2018

Universe

View full text Add to dashboard Cite

show abstract

“…In Ref. [19], the authors showed 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 fixedtarget experiment and the LHCb experiment at the LHC collider.…”

Section: Introductionmentioning

confidence: 99%

“…We hope that, by the development of experimental facilities, we will be able to detect other members of the doubly heavy baryons. The production mechanism of doubly heavy baryons has an important place in the literature [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. Naturally, a doubly heavy baryon can be produced using a two-step procedure: i-) in a hard interaction, a double heavy diquark is produced pertur-batively, ii-) and then it is transformed to the baryon within the soft hadronization process [34].…”

Section: Introductionmentioning

confidence: 99%

Effects of a dense medium on parameters of doubly heavy baryons

Azizi

2019

Phys. Rev. D

View full text Add to dashboard Cite

The spectroscopic properties of the doubly heavy spin-1/2 baryons Ξ QQ ′ , Ξ ′ QQ ′ , Ω QQ ′ and Ω ′ QQ ′ , with heavy quarks Q and Q ′ being b or/and c, are investigated in cold nuclear matter. In particular, the behavior of the mass of these particles with respect to the density of the medium in the range ρ ∈ [0, 1.4] ρsat, with ρsat = 0.11 3 GeV 3 being the saturation density of nuclear matter, is investigated. From the shifts in the mass and vector self energy of the states under consideration, it is obtained that Ξ QQ ′ and Ξ ′ QQ ′ baryons with two heavy quarks and one u or d quark are affected by the medium, considerably. It is also seen that the Ω QQ ′ and Ω ′ QQ ′ states, containing two heavy quarks and one s quark do not see the dense medium, at all. The value of mass for the Ξcc state obtained at ρ → 0 limit is nicely consistent with the experimental data. Our results on parameters of other members can be useful in the search for these states. The obtained results may also shed light on the future in-medium experiments aiming to search for the behavior of the doubly heavy baryons under extreme conditions.

show abstract

“…The SELEX experiment has already been shut down and its puzzle on Ξ cc observation, e.g., its measured production rate is much larger than most of the theoretical predictions [51,52], remains unresolved. The intrinsic charm production mechanism may solve this puzzle [26]. And we still need more accurate fixed-target experimental data to clarify the issue.…”

Section: Introductionmentioning

confidence: 99%

Impacts of the intrinsic charm content of the proton on the Ξcc hadroproduction at a fixed target experiment at the LHC

Chen

2019

Phys. Rev. D

View full text Add to dashboard Cite

In the present paper, we present detailed discussions on the hadronic production of Ξcc at a fixed target experiment at the LHC (After@LHC). The charm quarks in hadron could be either extrinsic or intrinsic. By using the BHPS model as the intrinsic charm distribution function in proton, we observe that even if by setting the proportion of finding the intrinsic charm in a proton as Ain = 1%, total cross sections for the g + c and c + c production mechanisms shall be enhanced by nearly two times. Thus the number of Ξcc events to be generated at the After@LHC can be greatly enhanced. Since the total cross sections and differential distributions for the Ξcc production at the After@LHC are sensitive to the value of Ain, the After@LHC could be a good platform for testing the idea of intrinsic charm. *

show abstract

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

Cited by 23 publications

References 36 publications

Supersymmetric and Conformal Features of Hadron Physics

Supersymmetric and Conformal Features of Hadron Physics

Effects of a dense medium on parameters of doubly heavy baryons

Impacts of the intrinsic charm content of the proton on the Ξcc hadroproduction at a fixed target experiment at the LHC

Contact Info

Product

Resources

About