Wave function corrections and off-forward gluon distributions in diffractive<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>electroproduction

Hoodbhoy, Pervez

doi:10.1103/physrevd.56.388

Cited by 79 publications

(95 citation statements)

References 11 publications

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“…denotes the projection operator, R 2 = R , to ensure the S-wave QQ state in the heavy-quark limit [9,12]. (This projection operator coincides with that discussed in Ref.…”

Section: Is Given Bymentioning

confidence: 95%

“…It is convenient to exploit the correspondence with the case of the J/ψ electroproductions. The light-cone WFs for the heavy vector mesons V = J/ψ, ϒ have been discussed in many works, but are still controversial in the treatment of subleading effects like the Fermi motion corrections [2,3,9], corrections to ensure the pure S-wave QQ state [10,11], etc. Here we employ the vector-meson light-cone WFs given by…”

Section: Is Given Bymentioning

confidence: 99%

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Diffractive Heavy Pseudoscalar-meson Productions by Weak Neutral Currents

Hayashigaki¹,

Suzuki²,

Tanaka³

2003

AIP Conference Proceedings

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Abstract. A first theoretical study for neutrino-induced diffractive productions of heavy pseudoscalar-mesons, η c and η b , off a nucleon is performed based on factorization formalism in QCD. We evaluate the forward diffractive production cross section in perturbative QCD in terms of the light-cone wave functions of Z boson and η c,b mesons, and the gluon distribution of the nucleon. The diffractive production of η c is governed by the axial vector coupling of the longitudinally polarized Z boson to QQ pair, and the resulting η c production cross section is larger than the J/ψ one by one order of magnitude. The bottomonium η b production, which shows up for higher beam energy, is also discussed.Exclusive diffractive leptoproductions of neutral vector mesons provide unique insight into an interplay between nonperturbative and perturbative effects in QCD. The diffractive processes are mediated by the exchange of a Pomeron with the vacuum quantum numbers, whose QCD description is directly related to the gluon distributions inside the nucleons for small 2,3]. The processes also allow us to probe the lightcone wave functions (WFs) of the vector mesons. Relating to the latter point, however, the applicability is apparently limited to probing the neutral vector mesons due to the vector nature of the electromagnetic current.In this talk, we propose the exclusive diffractive productions of mesons in terms of the neutrino beam. The weak currents allow us to observe both neutral and charged mesons by Z and W boson exchanges, and these mesons can be not only vector but also other types of mesons including pseudoscalar mesons. Thus, such processes may reveal structure of various kinds of mesons, the coupling of the QCD Pomeron to quark-antiquark pair with various spin-flavor quantum numbers, and also information on the CKM matrix elements. There already exist some experimental data for π, ρ,, and J/ψ production [4], although the amount of the data is not enough. On the other hand, there are only a few theoretical calculations, e.g., for the J/ψ production in a vector meson dominance model [7] and for D − s production with the generalized parton density [8]. Here, our interest will be directed to diffractive productions of heavy pseudoscalar mesons, η c and η b . So far η c has been observed via the decays of J/ψ or B mesons produced by pp and e + e − reactions, while η b has not been observed. The diffractive productions via the weak neutral current will give a direct access to η c as well as a new experimental method to identify η b by e.g. measuring the two photon decay.Diffractive heavy pseudoscalar-meson productions by weak neutral currents September 26, 2017 1

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“…denotes the projection operator, R 2 = R , to ensure the S-wave QQ state in the heavy-quark limit [9,12]. (This projection operator coincides with that discussed in Ref.…”

Section: Is Given Bymentioning

confidence: 95%

Section: Is Given Bymentioning

confidence: 99%

Diffractive Heavy Pseudoscalar-meson Productions by Weak Neutral Currents

Hayashigaki¹,

Suzuki²,

Tanaka³

2003

AIP Conference Proceedings

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“…2. The initial and final hadron state might have different quantum numbers and so it is applicable for several processes, namely, the production of neutral and charged vector [ 38] and pseudo scalar [ 39] mesons and or even for exotic states like the pentaquark [ 40] or hybrid mesons [ 41]. Besides the cross section also the transversal target spin asymmetry is described within the perturbative framework, which might be justified at a lower scale Q 2 as for the cross section itself [ 42,43].…”

Section: Hard Exclusive Reactions To Leading Ordermentioning

confidence: 99%

Generalized Parton Distributions – theoretical review –

Müller

2005

Nuclear Physics A

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In this talk an introduction to generalized parton distributions is given. Recent developments are shortly reviewed, including non-perturbative calculations, phenomenological aspects and evaluation of higher order perturbative and power corrections. In this talk an introduction to generalized parton distributions is given. Recent developments are shortly reviewed, including non-perturbative calculations, phenomenological aspects and evaluation of higher order perturbative and power corrections.

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“…Relativistic corrections from the J/ψ wave function have to be considered together with higher-order Fock components ccg of J/ψ. As shown in [5], when using the experimentally measured Γ ee , these corrections are small and of O(4%). We will hence neglect them in the following.…”

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confidence: 99%