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 kinematic correlations in cold nuclear matter

Vogt, R.

doi:10.1103/physrevc.101.024910

Cited by 13 publications

(8 citation statements)

References 49 publications

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“…The default fragmentation function in HVQMNR is the Peterson function [5], 2 , where z represents the fraction of the parent heavy flavor quark momentum…”

Section: Fragmentationmentioning

confidence: 99%

“…All pair observables studied by LHCb were calculated for both the parent bb mesons and the subsequent J/ψ J/ψ decays in Ref. [2]. Only the |∆φ * | distributions are shown here.…”

Section: Comparison To Lhcb Data On Bb → J/ψ J/ψxmentioning

confidence: 99%

“…For complete results, see Ref. [2]. These calculations employ the exclusive next-to-leading order (NLO) HVQMNR code [4] for QQ production and decay.…”

Section: Introductionmentioning

confidence: 99%

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Heavy Flavor Kinematic Correlations in Cold Nuclear Matter

Vogt¹

2021

Proceedings of 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions — PoS(HardPro

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It has been proposed that the azimuthal distributions of heavy flavor quark-antiquark pairs may be modified in the medium of a heavy-ion collision. This assumption was tested through nextto-leading order (NLO) calculations of the azimuthal distribution, dσ/dφ, including transverse momentum broadening, employing k 2 T and fragmentation in exclusive QQ pair production. The results have been compared to p + p and p + p data on QQ azimuthal correlations as well as bb correlations in p+ p collisions through their decays to J/ψJ/ψ, as measured by LHCb. Agreement

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“…The default fragmentation function in HVQMNR is the Peterson function [5], 2 , where z represents the fraction of the parent heavy flavor quark momentum…”

Section: Fragmentationmentioning

confidence: 99%

“…All pair observables studied by LHCb were calculated for both the parent bb mesons and the subsequent J/ψ J/ψ decays in Ref. [2]. Only the |∆φ * | distributions are shown here.…”

Section: Comparison To Lhcb Data On Bb → J/ψ J/ψxmentioning

confidence: 99%

See 1 more Smart Citation

Heavy Flavor Kinematic Correlations in Cold Nuclear Matter

Vogt¹

2021

Proceedings of 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions — PoS(HardPro

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“…The value k max Υ = 1 GeV is used as a default for both the Υ k T range as well as that for the Υ pair. The pair mass distributions for m b = 4.65 GeV, the bottom quark mass used in bottom quark calculations at next-to-leading order [24], are shown in the solid curve of Fig. 3(a).…”

Section: υ Pair Mass Distributionsmentioning

confidence: 99%

“…The LHCb Collaboration reported J/ψ pair production originating from bb pair production, followed by the decay of both b hadrons to J/ψ [23]. This LHCb measurement, performed in p + p collisions at √ s = 7 and 8 TeV, at forward rapidity, 2.5 < y < 5, can be well described by calculations assuming that the production originates from a single bb pair [23,24]. The predominant bb production mechanism in p + p collisions, perturbative QCD, produces single bb pairs at y = 0.…”

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confidence: 99%

Bottom Tetraquark Production at RHIC?

Vogt,

Angerami

2021

Preprint

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Background: A resonance has been observed by the ANDY Collaboration at the Relativistic Heavy-Ion Collider at Brookhaven National Laboratory in Cu+Au collisions at center-of-mass energy √ s = 200 GeV and at forward rapidity with an average mass of 18.15 GeV. The Collaboration suggests that it is a bbbb tetraquark state decaying to two Υ(1S) states, each measured through the Υ → ggg channel. Purpose: Their suggestion is investigated assuming that the two Υ states are produced through the materialization of a |uudbbbb Fock state in the projectile. Methods: The Υ pair mass and rapidity distributions arising from such a state are calculated. The production of an X b (bbbb) tetraquark state from the same Fock configuration is also investigated. The dependence on bottom quark mass and their transverse momentum range is also studied. Results: It is found that double Υ production from these |uudbbbb states peak in the rapidity range of the ANDY detector. The Υ pair and X b masses are, however, higher than the mass reported by the ANDY Collaboration. Conclusions: The results obtained from these calculations are incompatible with the ANDY result. They are, however, compatible with previous predictions of bbbb tetraquark masses. I. INTRODUCTIONQuantum Chromodynamics (QCD) is the theory describing the interactions among quarks and gluons. The fundamental color charges in this theory are confined in color-neutral objects known as baryons and mesons, containing three quarks and quark-antiquark pairs respectively. Since the advent of QCD, the existence of other, exotic, hadrons outside the conventional quark model, such as tetraquarks and pentaquarks, consisting of four or five valence quarks respectively, have been postulated, as early as in Murray Gell-Mann's introduction of the quark model [1].Most exotic hadrons so far discovered contain at least one cc pair. The first proposed tetraquark candidate, the X(3872), measured by Belle [2] in e + e − collisions, has been observed in many systems, including in nucleus-nucleus collisions [3]. The Z(4430), a ccdu tetraquark candidate was first measured by Belle [4] and later confirmed by LHCb [5]. The Z(3900), reported by BES III [6] and Belle [7], was confirmed as a four-quark state. Most recently, LHCb announced the discovery of a cccc tetraquark, the X(6900) [8]. LHCb has also announced the discovery of a uudcc pentaquark state, the P c (4312) + [9]. So far no tetraquark states containing b quarks, either qqbb or bbbb, have been confirmed.The ANDY Collaboration has recently reported an observation of a resonance with a mass of 18.15 GeV in Cu+Au collisions at the Relativistic Heavy-Ion Collider (RHIC) [10]. This observation was made at forward rapidity and was interpreted as a bbbb tetraquark state decaying to two Υ(1S) states, each decaying to hadrons through the Υ → ggg channel. These data were taken at √ s N N = 200 GeV in 2012. They used a minimum bias trigger plus an inclusive jet and dijet trigger. Because no luminosity measurement was performed, the results were presented...

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