γ∗γ∗ →ηc (1S,2S) transition form factors for spacelike photons
(2019) In Physical Review D 100(5).- Abstract
We derive the light-front wave function (LFWF) representation of the γ∗γ∗→ηc(1S),ηc(2S) transition form factor F(Q12,Q22) for two virtual photons in the initial state. For the LFWF, we use different models obtained from the solution of the Schrödinger equation for a variety of cc̄ potentials. We compare our results to the BABAR experimental data for the ηc(1S) transition form factor, for one real and one virtual photon. We observe that the onset of the asymptotic behavior is strongly delayed and discuss applicability of the collinear and/or massless limit. We present some examples of two-dimensional distributions for F(Q12,Q22). A factorization breaking measure is proposed and factorization breaking effects are quantified and shown to... (More)
We derive the light-front wave function (LFWF) representation of the γ∗γ∗→ηc(1S),ηc(2S) transition form factor F(Q12,Q22) for two virtual photons in the initial state. For the LFWF, we use different models obtained from the solution of the Schrödinger equation for a variety of cc̄ potentials. We compare our results to the BABAR experimental data for the ηc(1S) transition form factor, for one real and one virtual photon. We observe that the onset of the asymptotic behavior is strongly delayed and discuss applicability of the collinear and/or massless limit. We present some examples of two-dimensional distributions for F(Q12,Q22). A factorization breaking measure is proposed and factorization breaking effects are quantified and shown to be almost model independent. Factorization is shown to be strongly broken, and a scaling of the form factor as a function of Q̄2=(Q12+Q22)/2 is obtained.
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- author
- Babiarz, Izabela LU ; Goncalves, Victor P. LU ; Pasechnik, Roman LU ; Schäfer, Wolfgang and Szczurek, Antoni
- organization
- publishing date
- 2019-09-17
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review D
- volume
- 100
- issue
- 5
- article number
- 054018
- publisher
- American Physical Society
- external identifiers
-
- scopus:85072976119
- ISSN
- 2470-0010
- DOI
- 10.1103/PhysRevD.100.054018
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP.
- id
- 213951b0-0757-47d6-bfa6-2925c14e32b6
- date added to LUP
- 2022-04-03 17:54:13
- date last changed
- 2024-04-20 06:25:46
@article{213951b0-0757-47d6-bfa6-2925c14e32b6, abstract = {{<p>We derive the light-front wave function (LFWF) representation of the γ∗γ∗→ηc(1S),ηc(2S) transition form factor F(Q12,Q22) for two virtual photons in the initial state. For the LFWF, we use different models obtained from the solution of the Schrödinger equation for a variety of cc̄ potentials. We compare our results to the BABAR experimental data for the ηc(1S) transition form factor, for one real and one virtual photon. We observe that the onset of the asymptotic behavior is strongly delayed and discuss applicability of the collinear and/or massless limit. We present some examples of two-dimensional distributions for F(Q12,Q22). A factorization breaking measure is proposed and factorization breaking effects are quantified and shown to be almost model independent. Factorization is shown to be strongly broken, and a scaling of the form factor as a function of Q̄2=(Q12+Q22)/2 is obtained.</p>}}, author = {{Babiarz, Izabela and Goncalves, Victor P. and Pasechnik, Roman and Schäfer, Wolfgang and Szczurek, Antoni}}, issn = {{2470-0010}}, language = {{eng}}, month = {{09}}, number = {{5}}, publisher = {{American Physical Society}}, series = {{Physical Review D}}, title = {{γ∗γ∗ →ηc (1S,2S) transition form factors for spacelike photons}}, url = {{http://dx.doi.org/10.1103/PhysRevD.100.054018}}, doi = {{10.1103/PhysRevD.100.054018}}, volume = {{100}}, year = {{2019}}, }