Quantum Chromodynamic Predictions for the Deuteron Form Factor

Brodsky, Stanley J.; Ji, Chueng‐Ryong; Lepage, G. Peter

doi:10.1103/physrevlett.51.83

Cited by 177 publications

(211 citation statements)

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“…For coherent hard breakup of the preexisting ∆'s we will obtain the same cross section for both the ∆ ++ ∆ − and the ∆ + ∆ 0 channels. One interesting scenario for probing the preexisting ∆'s in the deuteron is using the decomposition of the deuteron wave function, in the chiral symmetry restored limit, into the nucleonic and non-nucleonic components in the following form [28][29][30]:…”

Section: Numerical Estimatesmentioning

confidence: 99%

“…[28][29][30][31][32]). This relation follows from the observation [28,29] that in the regime in which the chiral symmetry is restored the color singled 6-quark configuration can be expressed through the superposition of N N , ∆∆ and hidden-color components with relative normalizations fixed by the SU (3) symmetry. Thus, experimental verification of the relative strength of the N N to ∆∆ component could shed light on the existence of hidden color components in the deuteron wave function.…”

Section: Introductionmentioning

confidence: 99%

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Hard breakup of the deuteron into twoΔisobars

Granados

Sargsian

2011

Phys. Rev. C

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We study high energy photodisintegration of the deuteron into two ∆-isobars at large center of mass angles within the QCD hard rescattering model (HRM). According to the HRM, the process develops in three main steps: the photon knocks a quark from one of the nucleons in the deuteron; the struck quark rescatters off a quark from the other nucleon sharing the high energy of the photon; then the energetic quarks recombine into two outgoing baryons which have large transverse momenta. Within the HRM, the cross section is expressed through the amplitude of pn → ∆∆ scattering which we evaluated based on the quark-interchange model of hard hadronic scattering. Calculations show that the angular distribution and the strength of the photodisintegration is mainly determined by the properties of the pn → ∆∆ scattering. We predict that the cross section of the deuteron breakup to ∆ ++ ∆ − is 4-5 times larger than that of the breakup to the ∆ + ∆ 0 channel. Also, the angular distributions for these two channels are markedly different. These can be compared with the predictions based on the assumption that two hard ∆-isobars are the result of the disintegration of the preexisting ∆∆ components of the deuteron wave function. In this case, one expects the angular distributions and cross sections of the breakup in both ∆ ++ ∆ − and ∆ + ∆ 0 channels to be similar.

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Section: Numerical Estimatesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hard breakup of the deuteron into twoΔisobars

Granados

Sargsian

2011

Phys. Rev. C

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“…The partonic structure of the deuteron has been explored in terms of the parton distributions accessible in deep inelastic scattering [1], and in terms of the form factors measured in elastic lepton-deuteron processes [2,3]. It is natural to ask what can be learned from generalized parton distributions (GPDs), introduced not long ago in [4,5].…”

mentioning

confidence: 99%

“…The polarizations for the outgoing deuteron are obtained from Eq. (17) by the exchange p µ ↔ p ′µ , ξ ↔ −ξ and an overall sign change for ǫ (1) and ǫ (2) . With this we get…”

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confidence: 99%

Generalized Parton Distributions in the Deuteron

et al. 2001

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Abstract. We introduce generalized quark and gluon distributions in the deuteron, which can be measured in exclusive processes like deeply virtual Compton scattering and meson electroproduction. We discuss the basic properties of these distributions, and point out how they probe the interplay of nucleon and parton degrees of freedom in the deuteron wave function.Introduction. The partonic structure of the deuteron has been explored in terms of the parton distributions accessible in deep inelastic scattering [1], and in terms of the form factors measured in elastic lepton-deuteron processes [2,3]. It is natural to ask what can be learned from generalized parton distributions (GPDs), introduced not long ago in [4,5]. For the nucleon case it has been shown that these quantities contain unique information about the dynamics of quarks and gluons in QCD bound states, beyond what can be unraveled from ordinary parton distributions and form factors. Here we extend these studies to the case of the deuteron, with the aim of providing the theoretical framework to analyze and interpret present and future measurements with deuteron targets. We restrict ourselves to parton distributions of twist two, and to the parton helicity conserving sector, which is relevant in most phenomenological applications. Quark and gluon helicity flip GPDs can be treated with the same methods.

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“…The coherence of multi-particle correlations within the Fock states leads to higher-twist bosonic processes such as e(qq) → e (qq) ; although suppressed by inverse powers of Q 2 , such subprocesses are important in the duality regime of fixed W 2 , particularly in σ L [21]. In the case of nuclei, one must include nonnucleonic "hidden color" [22] degrees of freedom of the deuteron LFWF.…”

Section: Wavefunction Representation Of Dis and Dvcsmentioning

confidence: 99%

Deep Inelastic Scattering at the Amplitude Level

Brodsky¹

2005

AIP Conference Proceedings

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Abstract. The deep inelastic lepton scattering and deeply virtual Compton scattering cross sections can be interpreted in terms of the fundamental wavefunctions defined by the light-front Fock expansion, thus allowing tests of QCD at the amplitude level. The AdS/CFT correspondence between gauge theory and string theory provides remarkable new insights into QCD, including a model for hadronic wavefunctions which display conformal scaling at short distances and color confinement at large distances.Keywords: Quantum Chromodynamics, Deep Inelastic Scattering, Gauge/String Duality PACS: 12.38.Aw,13.60.Hb,11.25.Tq WAVEFUNCTION REPRESENTATION OF DIS AND DVCSThe primary goal of deep inelastic lepton scattering is to resolve the fundamental structure of the nucleon. In fact, by combining measurements of DIS with measurements of deeply virtual Compton scattering, elastic lepton-hadron scattering, and other hard exclusive channels, it is possible to obtain information on the fundamental form of quark and gluon bound-state wavefunctions. Thus, for the first time, we have the potential to test QCD at the amplitude level.If one quantizes QCD at fixed light-front time x + = x 0 + x 3 , the bound state hadronic solutions | Ψ H are eigenstates of the light-front Heisenberg equation. The spectrum of QCD is given by the eigenvalues M 2 H . The projection of each hadronic eigensolution on the free Fock basis: n | Ψ H ≡ ψ n/H (x i , k ⊥i , λ i ) defines the LF Fock expansion in terms of the quark and transversely polarized gluon constituents in A + = 0 light-cone gauge. The light-front wavefunctions are frameindependent functions of the constituent light-cone fractions x i , relative transverse momenta k ⊥i , and spin projections S z i = λ i . Observables in DIS and DVCS can be calculated directly from the hadron LFWFs. For example, the quark and gluon distributions measured in DIS are defined from the squares of the LFWFS summed over all Fock states n. Form factors, exclusive weak transition amplitudes [2] and the generalized parton distributions [3] measured in DVCS are overlaps of the initial and final LFWFS with n = n and n = n + 2. The resulting distributions obey DGLAP, BFKL, and ERBL evolution as a function of the maximal invariant mass, thus providing a physical factorization scheme [4]. It is important to note that at large x where the struck quark is far-off shell, DGLAP evolution is quenched [5], so that the fall-off of the DIS cross sections in Q 2 satisfies inclusive-exclusive duality at fixed W 2 . The gauge-invariant distribution amplitude φ H (x i , Q) defined from the integral over the transverse momenta k 2 ⊥i ≤ Q 2 of the valence (smallest n) Fock state provides a fundamental measure of the hadron at the amplitude level [6,7]; they are the nonperturbative input to the factorized form of hard

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Quantum Chromodynamic Predictions for the Deuteron Form Factor

Cited by 177 publications

References 15 publications

Hard breakup of the deuteron into twoΔisobars

Hard breakup of the deuteron into twoΔisobars

Generalized Parton Distributions in the Deuteron

Deep Inelastic Scattering at the Amplitude Level

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