First measurement of the |t|-dependence of coherent J/ψ photonuclear production

S Acharya; Jonatan Adolfsson; Sumit Basu; Peter Christiansen; Oliver Matonoha; Adrian Nassirpour; Alice Ohlson; Anders Oskarsson; Tuva Richert; Omar Vazquez Rueda; David Silvermyr; N Zurlo; ALICE Collaboration

doi:10.1016/j.physletb.2021.136280

First measurement of the |t|-dependence of coherent J/ψ photonuclear production

S Acharya, Jonatan Adolfsson, Sumit Basu, Peter Christiansen, Oliver Matonoha, Adrian Nassirpour, Alice Ohlson, Anders Oskarsson, Tuva Richert, Omar Vazquez Rueda, David Silvermyr, N Zurlo, ALICE Collaboration

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Abstract

The first measurement of the cross section for coherent J/ψ photoproduction as a function of |t|, the square of the momentum transferred between the incoming and outgoing target nucleus, is presented. The data were measured with the ALICE detector in ultra-peripheral Pb–Pb collisions at a centre-of-mass energy per nucleon pair sNN=5.02TeV with the J/ψ produced in the central rapidity region |y|<0.8, which corresponds to the small Bjorken-x range (0.3−1.4)×10−3. The measured |t|-dependence is not described by computations based only on the Pb nuclear form factor, while the photonuclear cross section is better reproduced by models including shadowing according to the leading-twist approximation, or gluon-saturation effects from the impact-parameter dependent Balitsky–Kovchegov equation. These new results are therefore a valid tool to constrain the relevant model parameters and to investigate the transverse gluonic structure at very low Bjorken-x. © 2021 The Author(s)

Original language	English
Article number	136280
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	817
DOIs	https://doi.org/10.1016/j.physletb.2021.136280
Publication status	Published - 2021

Subject classification (UKÄ)

Subatomic Physics

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10.1016/j.physletb.2021.136280

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Acharya, S., Adolfsson, J., Basu, S., Christiansen, P., Matonoha, O., Nassirpour, A., Ohlson, A., Oskarsson, A., Richert, T., Vazquez Rueda, O., Silvermyr, D., Zurlo, N., & ALICE Collaboration (2021). First measurement of the |t|-dependence of coherent J/ψ photonuclear production. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 817, Article 136280. https://doi.org/10.1016/j.physletb.2021.136280

@article{8cba7378ffc34b5fb33780c4f03614ad,

title = "First measurement of the |t|-dependence of coherent J/ψ photonuclear production",

abstract = "The first measurement of the cross section for coherent J/ψ photoproduction as a function of |t|, the square of the momentum transferred between the incoming and outgoing target nucleus, is presented. The data were measured with the ALICE detector in ultra-peripheral Pb–Pb collisions at a centre-of-mass energy per nucleon pair sNN=5.02TeV with the J/ψ produced in the central rapidity region |y|<0.8, which corresponds to the small Bjorken-x range (0.3−1.4)×10−3. The measured |t|-dependence is not described by computations based only on the Pb nuclear form factor, while the photonuclear cross section is better reproduced by models including shadowing according to the leading-twist approximation, or gluon-saturation effects from the impact-parameter dependent Balitsky–Kovchegov equation. These new results are therefore a valid tool to constrain the relevant model parameters and to investigate the transverse gluonic structure at very low Bjorken-x. {\textcopyright} 2021 The Author(s)",

author = "S Acharya and Jonatan Adolfsson and Sumit Basu and Peter Christiansen and Oliver Matonoha and Adrian Nassirpour and Alice Ohlson and Anders Oskarsson and Tuva Richert and {Vazquez Rueda}, Omar and David Silvermyr and N Zurlo and {ALICE Collaboration}",

year = "2021",

doi = "10.1016/j.physletb.2021.136280",

language = "English",

volume = "817",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

}

Acharya, S, Adolfsson, J, Basu, S , Christiansen, P , Matonoha, O , Nassirpour, A , Ohlson, A , Oskarsson, A, Richert, T, Vazquez Rueda, O, Silvermyr, D, Zurlo, N & ALICE Collaboration 2021, 'First measurement of the |t|-dependence of coherent J/ψ photonuclear production', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 817, 136280. https://doi.org/10.1016/j.physletb.2021.136280

TY - JOUR

T1 - First measurement of the |t|-dependence of coherent J/ψ photonuclear production

AU - Acharya, S

AU - Adolfsson, Jonatan

AU - Basu, Sumit

AU - Christiansen, Peter

AU - Matonoha, Oliver

AU - Nassirpour, Adrian

AU - Ohlson, Alice

AU - Oskarsson, Anders

AU - Richert, Tuva

AU - Vazquez Rueda, Omar

AU - Silvermyr, David

AU - Zurlo, N

AU - ALICE Collaboration

PY - 2021

Y1 - 2021

N2 - The first measurement of the cross section for coherent J/ψ photoproduction as a function of |t|, the square of the momentum transferred between the incoming and outgoing target nucleus, is presented. The data were measured with the ALICE detector in ultra-peripheral Pb–Pb collisions at a centre-of-mass energy per nucleon pair sNN=5.02TeV with the J/ψ produced in the central rapidity region |y|<0.8, which corresponds to the small Bjorken-x range (0.3−1.4)×10−3. The measured |t|-dependence is not described by computations based only on the Pb nuclear form factor, while the photonuclear cross section is better reproduced by models including shadowing according to the leading-twist approximation, or gluon-saturation effects from the impact-parameter dependent Balitsky–Kovchegov equation. These new results are therefore a valid tool to constrain the relevant model parameters and to investigate the transverse gluonic structure at very low Bjorken-x. © 2021 The Author(s)

AB - The first measurement of the cross section for coherent J/ψ photoproduction as a function of |t|, the square of the momentum transferred between the incoming and outgoing target nucleus, is presented. The data were measured with the ALICE detector in ultra-peripheral Pb–Pb collisions at a centre-of-mass energy per nucleon pair sNN=5.02TeV with the J/ψ produced in the central rapidity region |y|<0.8, which corresponds to the small Bjorken-x range (0.3−1.4)×10−3. The measured |t|-dependence is not described by computations based only on the Pb nuclear form factor, while the photonuclear cross section is better reproduced by models including shadowing according to the leading-twist approximation, or gluon-saturation effects from the impact-parameter dependent Balitsky–Kovchegov equation. These new results are therefore a valid tool to constrain the relevant model parameters and to investigate the transverse gluonic structure at very low Bjorken-x. © 2021 The Author(s)

U2 - 10.1016/j.physletb.2021.136280

DO - 10.1016/j.physletb.2021.136280

M3 - Article

SN - 0370-2693

VL - 817

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 136280

ER -

First measurement of the |t|-dependence of coherent J/ψ photonuclear production

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