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Energy dependence of coherent photonuclear production of J/psi mesons in ultra-peripheral Pb-Pb collisions at sqrt{s_(NN)}=5.02 TeV
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Energy dependence of coherent photonuclear production of J/psi mesons in ultra-peripheral Pb-Pb collisions at sqrt{s_(NN)}=5.02 TeV
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The cross section for coherent photonuclear production of J/$\psi$ is presented as a function of the electromagnetic dissociation (EMD) of Pb. The measurement is performed with the ALICE detector in ultra-peripheral Pb-Pb collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV. Cross sections are presented in five different J/$\psi$ rapidity ranges within $|y|<4$, with the J/$\psi$ reconstructed via its dilepton decay channels. In some events the J/$\psi$ is not accompanied by EMD, while other events do produce neutrons from EMD at beam rapidities either in one or the other beam direction, or in both. The cross sections in a given rapidity range and for different configurations of neutrons from EMD allow for the extraction of the energy dependence of this process in the range $17 < W_{\gamma\, \mathrm{Pb, n}} <920$ GeV, where $W_{\gamma\, \mathrm{Pb, n}}$ is the centre-of-mass energy per nucleon of the $\gamma\,\mathrm{Pb}$ system. This range corresponds to a Bjorken-$x$ interval spanning about three orders of magnitude: $ 1.1\times10^{-5}<x<3.3\times 10^{-2}$. In addition to the ultra-peripheral and photonuclear cross sections, the nuclear suppression factor is obtained. These measurements point to a strong depletion of the gluon distribution in Pb nuclei over a broad, previously unexplored, energy range. These results, together with previous ALICE measurements, provide unprecedented information to probe quantum chromodynamics at high energies.
Forward citations
Cited by 6 Pith papers
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A First Account of the Impact of Ion Electromagnetic Dissociation on Event Exclusivity in Ultraperipheral LHC Collisions
Hadrons from ion electromagnetic dissociation break exclusivity conditions in ultraperipheral collisions, resolving tensions in exclusive muon-pair and coherent J/ψ measurements at the LHC.
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Unbiased Data-Driven Determination of the Nuclear Dipole Amplitude in the Color Glass Condensate
The 208Pb dipole amplitude is learned from R_pPb and coherent J/ψ photoproduction data with the BK equation embedded in training, giving Q²_s0(Pb)/Q²_s0(p) = 3.17 and an MV-type initial condition.
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Femtoscopy-driven searches for saturated gluonic matter in inclusive photonuclear processes
Femtoscopy is presented as a method to isolate gluon saturation and nuclear shadowing effects via space-time structure in photonuclear collisions.
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Measurement of coherent exclusive $J/\psi\to\mu^+\mu^-$ production in ultraperipheral Pb+Pb collisions at $\sqrt{s_{\textrm{NN}}}=5.36$ TeV with the ATLAS detector
ATLAS reports differential cross sections for coherent exclusive J/ψ → μ⁺μ⁻ in Pb+Pb ultraperipheral collisions at √s_NN=5.36 TeV, agreeing with models but in tension with prior Run 2 data at central rapidity.
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Nuclear Cold QCD: Review and Future Strategy
Review summarizing observed cold nuclear matter modifications in hadron-nucleus collision data and proposing experimental strategies for the EIC to clarify underlying QCD mechanisms.
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Ultra-peripheral Collisions
Ultra-peripheral collisions of heavy ions are reviewed as the energy frontier for photon physics; the paper consolidates a decade of LHC/RHIC results and proposes no new measurement.
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