Light-cone representation of the spin and orbital angular momentum of relativistic composite systems

Brodsky, Stanley J.; Hwang, Dae Sung; Ma, Bo-Qiang; Schmidt, Iván

doi:10.1016/s0550-3213(00)00626-x

Cited by 386 publications

(519 citation statements)

References 43 publications

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“…Our simulations show that the rates in Eqs. (28) and (29) may play a more important role than the effective fractional energy losses ǫ = ∆E/E ≈ 1 −z and ǫ ≈ 1 −x, which are larger for c-quarks/D-mesons.…”

Section: Heavy Meson Suppression Phenomenologymentioning

confidence: 99%

Collisional dissociation of heavy mesons in dense QCD matter

2007

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In the framework of the reaction operator approach we calculate and resum the multiple elastic scattering of a fast qq system traversing dense nuclear matter. We derive the collisional broadening of the meson's transverse momentum and the distortion of its intrinsic light cone wave function. The medium-induced dissociation probability of heavy mesons is shown to be sensitive to the opacity of the quark-gluon plasma and the time dependence of its formation and evolution. We solve the system of coupled rate equations that describe the competition between the fragmentation of cand b-quarks and the QGP-induced dissociation of the D-and B-mesons to evaluate the quenching of heavy hadrons in nucleus-nucleus collisions. In contrast to previous results on heavy quark modification, this approach predicts suppression of B-mesons comparable to that of D-mesons at transverse momenta as low as pT ∼ 10 GeV. It allows for an improved description of the large attenuation of non-photonic electrons in central Au+Au reactions at RHIC.

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Section: Heavy Meson Suppression Phenomenologymentioning

confidence: 99%

Collisional dissociation of heavy mesons in dense QCD matter

2007

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“…Both the two-and threeparticle Fock state components are given in [4]. The two-particle wave functions for spin-up electrons are [4,13,15] 8…”

Section: Dvcs In Qed At One Loopmentioning

confidence: 99%

“…[4,13,15], we work in a generalized form of QED by assigning a mass M to the external electrons, a distinct mass m for the internal electron lines, and a nonzero mass for the internal photon lines, assuming the stability condition M < m . This provides a model for a composite fermion state with mass M with fermion and vector ''diquark'' constituents.…”

Section: Dvcs In Qed At One Loopmentioning

confidence: 99%

Hadron optics in three-dimensional invariant coordinate space from deeply virtual Compton scattering

et al. 2007

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The Fourier transform of the deeply virtual Compton scattering amplitude (DVCS) with respect to the skewness parameter Q 2 =2p q can be used to provide an image of the target hadron in the boostinvariant variable , the coordinate conjugate to light-front time t z=c. As an illustration, we construct a consistent covariant model of the DVCS amplitude and its associated generalized parton distributions using the quantum fluctuations of a fermion state at one loop in QED, thus providing a representation of the light-front wave functions (LFWFs) of a lepton in space. A consistent model for hadronic amplitudes can then be obtained by differentiating the light-front wave functions with respect to the bound-state mass. The resulting DVCS helicity amplitudes are evaluated as a function of and the impact parameterb ? , thus providing a light-front image of the target hadron in a frame-independent threedimensional light-front coordinate space. Models for the LFWFs of hadrons in 3 1 dimensions displaying confinement at large distances and conformal symmetry at short distances have been obtained using the AdS/CFT method. We also compute the LFWFs in this model in invariant three-dimensional coordinate space. We find that, in the models studied, the Fourier transform of the DVCS amplitudes exhibit diffraction patterns. The results are analogous to the diffractive scattering of a wave in optics where the distribution in measures the physical size of the scattering center in a one-dimensional system.

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“…One is from the light-cone quark model by taking into account the Melosh-Wigner rotation effect [9,10,11], and another is from a full relativistic field theory treatment of the interaction vertex [2,3].…”

Section: The Two Particle Fock-state Of the Pion Vertexmentioning

confidence: 99%

Pion-photon and photon-pion transition form factors in the light-cone formalism

Xiao

2003

Phys. Rev. D

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We derive the minimal Fock-state expansions of the pion and the photon wave functions in lightcone formalism, then we calculate the pion-photon and the photon-pion transition form factors of γ * π 0 → γ and γ * γ → π 0 processes by employing these quark-antiquark wave functions of the pion and the photon. We find that our calculation for the γ * γ → π 0 transition form factor agrees with the experimental data at low and moderately high energy scale. Moreover, the physical differences and inherent connections between the transition form factors of γ * π 0 → γ and γ * γ → π 0 have been illustrated, which indicate that these two physical processes are intrinsically related. In addition, we also discuss the π 0 → γγ form factor and the decay width Γ (π → γγ) at Q 2 = 0.

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Light-cone representation of the spin and orbital angular momentum of relativistic composite systems

Cited by 386 publications

References 43 publications

Collisional dissociation of heavy mesons in dense QCD matter

Collisional dissociation of heavy mesons in dense QCD matter

Hadron optics in three-dimensional invariant coordinate space from deeply virtual Compton scattering

Pion-photon and photon-pion transition form factors in the light-cone formalism

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