Nuclear Drell-Yan effect in a covariant model

Korpa, C. L.; Dieperink, A.E.L.

doi:10.1103/physrevc.87.014616

Cited by 3 publications

(11 citation statements)

References 34 publications

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“…Next, we may use the commutators [Q a 5 , Q b 5 ] = if abc Q c for the (3,3) and the (6, 3) chiral multiplets worked out in Ref. [33] and listed in Appendix B, which all lead to the same SU(3) vector charges Q c :…”

Section: Consistency Of Chiral Algebramentioning

confidence: 99%

“…where i stands for the three chiral multiplets (6,3), (3,3) and (3,3), and the nucleon-octet mass matrix M 0 Bi in the "physical" basis reads…”

Section: Chiral Symmetry Breaking: Bare Baryon Massesmentioning

confidence: 99%

“…For more than 35 years the deviation of the nucleon Σ πN term extracted from the measured πN scattering partial wave analyses (in the following to be called "measured value", for brevity) from the (naive quark model) value of 25 MeV was interpreted as an increase of Zweig-rule-breaking in the nucleon, or equivalently to an increased content of (unpolarized) ss pairs in the nucleon [1][2][3], defined as y = 2 N |ss|N N |ūu+ūu|N . Moreover, the anomalously small measured value of the flavor-singlet axial coupling g (0) A = 0.33 ± 0.06 [4][5][6], or the older value 0.28 ± 0.16 [7], as compared with the naive quark model prediction of g (0) A = 1, was long interpreted as evidence for an increased polarized ss content of the nucleon [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Baryon fields withUL(3)×UR(3)chiral symmetry. V. Pion-nucleon and kaon-nucleon
Dmitrašinović¹,
Chen²
2016
Phys. Rev. C

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We have previously calculated the pion-nucleon ΣπN term in the chiral mixing approach with u, d flavors only, and found the lower bound ΣπN ≥ 1 + 16 3 sin 2 θ 3 2 m 0 u + m 0 d where m 0 u , m 0 d are the current quark masses, and θ is the mixing angle of the [( 1 2 , 0) ⊕ (0, 1 2 )] and the [(1, 1 2 ) ⊕ ( 1 2 , 1)] chiral multiplets. This mixing angle can be calculated as sin 2 θ = 3 8 g (0)A + g(3) A, where gA , gA , are the flavor-singlet and the isovector axial couplings. With presently accepted values of current quark masses, this leads to ΣπN ≥ 58.0 ± 4.5 +11.4 −6.5 MeV, which is in agreement with the values extracted from experiments, and substantially higher than most previous two-flavour calculations. The causes of this enhancement are: 1) the large, ( 16 3 ≃ 5.3), purely SUL(2) × SUR(2) algebraic factor; 2) the admixture of the [(1, 12 ) ⊕ ( 1 2 , 1)] chiral multiplet component in the nucleon, whose presence has been known for some time, but that had not been properly taken into account, yet. We have now extended these calculations of ΣπN to three light flavours, i.e., to SUL(3) × SUR(3) multiplet mixing. Phenomenology of chiral SUL(3) × SUR(3) multiplet mixing demands the presence of three chiral SUL(3) × SUR(3) multiplets, viz. [(6, 3) ⊕ (3, 6)], [(3, 3) ⊕ ( 3, 3)] and [( 3, 3) ⊕ (3, 3)], in order to successfully reproduce the baryons' flavor-octet and flavor-singlet axial currents, as well as the baryon anomalous magnetic moments. Here we use these previously obtained results, together with known constraints on the explicit chiral symmetry breaking in baryons to calculate the ΣπN term, but find little, or no change of ΣπN from the above successful two-flavor result. The physical significance of these results lies in the fact that they show no need for q 4 q components, and in particular, no need for an ss component in the nucleon, in order to explain the large "observed" ΣπN value. We also predict the experimentally unknown kaon-nucleon sigma term ΣKN .

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Section: Consistency Of Chiral Algebramentioning

confidence: 99%

“…where i stands for the three chiral multiplets (6,3), (3,3) and (3,3), and the nucleon-octet mass matrix M 0 Bi in the "physical" basis reads…”

Section: Chiral Symmetry Breaking: Bare Baryon Massesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Baryon fields withUL(3)×UR(3)chiral symmetry. V. Pion-nucleon and kaon-nucleon
Dmitrašinović¹,
Chen²
2016
Phys. Rev. C

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“…This relation was exploited in a number of calculations of the nuclear pion/meson correction to the nuclear structure functions [35,38,40,42]. These studies show an enhancement of the nuclear structure functions in the region 0.05 < x < 0.15.…”

Section: B Correction Due To Nuclear Meson Exchange Currentsmentioning

confidence: 99%

“…The nucleon light-cone distribution functions are driven by the nuclear spectral function, which defines the energy-momentum distribution of bound nucleons [15][16][17][18][19][20][21][22]. The calculation of mesonic correction is less certain and model-dependent [34][35][36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Nuclear parton distributions and the Drell-Yan process

2014

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We study the nuclear parton distribution functions on the basis of our recently developed semimicroscopic model, which takes into account a number of nuclear effects including nuclear shadowing, Fermi motion and nuclear binding, nuclear meson-exchange currents and off-shell corrections to bound nucleon distributions. We discuss in details the dependencies of nuclear effects on the type of parton distribution (nuclear sea vs. valence) as well as on the parton flavour (isospin).We apply the resulting nuclear parton distributions to calculate ratios of cross sections for protoninduced Drell-Yan production off different nuclear targets. We obtain a good agreement on the magnitude, target and projectile x and the dimuon mass dependence of proton-nucleus Drell-Yan process data from the E772 and E866 experiments at Fermilab. We also provide nuclear corrections for the Drell-Yan data from the E605 experiment.

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Nuclear medium effects in Drell–Yan process

Haider

Athar

Singh

et al. 2017

J. Phys. G: Nucl. Part. Phys.

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We study the nuclear medium effects in Drell-Yan process using quark parton distribution functions calculated in a microscopic nuclear model which takes into account the effects of Fermi motion, nuclear binding and nucleon correlations through a relativistic nucleon spectral function. The contributions of π and ρ mesons as well as shadowing effects are also included. The beam energy loss is calculated using a phenomenological approach. The present theoretical results are compared with the experimental results of E772 and E886 experiments. These results are applicable to the forthcoming experimental analysis of E906 Sea Quest experiment at Fermi Lab.

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Nuclear Drell-Yan effect in a covariant model

Cited by 3 publications

References 34 publications

Baryon fields withUL(3)×UR(3)chiral symmetry. V. Pion-nucleon and kaon-nucleon
Dmitrašinović¹,
Chen²
2016
Phys. Rev. C

Baryon fields withUL(3)×UR(3)chiral symmetry. V. Pion-nucleon and kaon-nucleon
Dmitrašinović¹,
Chen²
2016
Phys. Rev. C

Nuclear parton distributions and the Drell-Yan process

Nuclear medium effects in Drell–Yan process

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Nuclear Drell-Yan effect in a covariant model

Cited by 3 publications

References 34 publications

Baryon fields withUL(3)×UR(3)chiral symmetry. V. Pion-nucleon and kaon-nucleonDmitrašinović1, Chen2 2016Phys. Rev. C

Baryon fields withUL(3)×UR(3)chiral symmetry. V. Pion-nucleon and kaon-nucleonDmitrašinović1, Chen2 2016Phys. Rev. C

Nuclear parton distributions and the Drell-Yan process

Nuclear medium effects in Drell–Yan process

Contact Info

Product

Resources

About

Baryon fields withUL(3)×UR(3)chiral symmetry. V. Pion-nucleon and kaon-nucleon
Dmitrašinović¹,
Chen²
2016
Phys. Rev. C

Baryon fields withUL(3)×UR(3)chiral symmetry. V. Pion-nucleon and kaon-nucleon
Dmitrašinović¹,
Chen²
2016
Phys. Rev. C