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@ARTICLE{Acharya:245791,
      author       = {Acharya, Shreyasi and others},
      title        = {{F}irst measurement of coherent ρ$^0$ photoproduction in
                      ultra-peripheral {X}e–{X}e collisions at $\sqrt{s_{\rm
                      {NN}}}$ = 5.44 {T}e{V}},
      journal      = {Physics letters / B},
      volume       = {820},
      issn         = {0370-2693},
      address      = {Amsterdam},
      publisher    = {North-Holland Publ.},
      reportid     = {GSI-2022-00111, arXiv:2101.02581. CERN-EP-2020-252},
      pages        = {136481},
      year         = {2021},
      note         = {Phys. Lett. B 820 (2021) 136481. 21 pages, 4 captioned
                      figures, 2 tables, authors from page 16, published version,
                      figures at http://alice-publications.web.cern.ch/node/6757
                      "his is an open access article under the CC BY license
                      (http://creativecommons.org/licenses/by/4.0/). Funded by
                      SCOAP3"},
      abstract     = {The first measurement of the coherent photoproduction of
                      ρ$^0$ vector mesons in ultra-peripheral Xe–Xe collisions
                      at $\sqrt{s_{\rm NN}}$ = 5.44 TeV is presented. This result,
                      together with previous HERA γp data and γ–Pb
                      measurements from ALICE, describes the atomic number (A)
                      dependence of this process, which is particularly sensitive
                      to nuclear shadowing effects and to the approach to the
                      black-disc limit of QCD at a semi-hard scale. The cross
                      section of the Xe+Xe→ρ$^0$+Xe+Xe process, measured at
                      midrapidity through the decay channel
                      ρ$^0$→π$^+$π$^−$, is found to be
                      dσ/dy=131.5±5.6(stat.)−16.9+17.5(syst.) mb. The ratio of
                      the continuum to resonant contributions for the production
                      of pion pairs is also measured. In addition, the fraction of
                      events accompanied by electromagnetic dissociation of either
                      one or both colliding nuclei is reported. The dependence on
                      A of cross section for the coherent ρ$^0$ photoproduction
                      at a centre-of-mass energy per nucleon of the γA system of
                      W$_{γA,n}$ = 65 GeV is found to be consistent with a
                      power-law behaviour σ(γA→ρ$^0$A)∝A$^α$ with a slope
                      α=0.96±0.02(syst.). This slope signals important shadowing
                      effects, but it is still far from the behaviour expected in
                      the black-disc limit.},
      keywords     = {rho(770)0: photoproduction (INSPIRE) / nucleus: shadowing
                      (INSPIRE) / pi: production (INSPIRE) / dissociation:
                      electromagnetic (INSPIRE) / coherence (INSPIRE) / quantum
                      chromodynamics (INSPIRE) / vector meson (INSPIRE) /
                      experimental results (INSPIRE) / rho(770)0 --> pi+ pi-
                      (INSPIRE) / 5440 GeV-cms/nucleon (INSPIRE)},
      cin          = {ALI / DTL / CIT / EXM / ALICE@CERN},
      ddc          = {530},
      cid          = {I:(DE-Ds200)ALI-20080822OR105 /
                      I:(DE-Ds200)DTL-20051214OR031 /
                      I:(DE-Ds200)CIT-20110310OR121 /
                      I:(DE-Ds200)EXM-20080818OR100 / I:(DE-Ds200)Coll-CERN-ALICE},
      pnm          = {612 - Cosmic Matter in the Laboratory (POF4-612) / HGS-HIRe
                      - HGS-HIRe for FAIR (HGS-HIRe) / SUC-GSI-Heidelberg -
                      Strategic university cooperation GSI-U Heidelberg
                      (SUC-GSI-HE) / SUC-GSI-Frankfurt - Strategic university
                      cooperation GSI-U Frankfurt/M (SUC-GSI-FR) /
                      SUC-GSI-Darmstadt - Strategic university cooperation GSI-TU
                      Darmstadt (SUC-GSI-DA)},
      pid          = {G:(DE-HGF)POF4-612 / G:(DE-Ds200)HGS-HIRe /
                      G:(DE-Ds200)SUC-GSI-HE / G:(DE-Ds200)SUC-GSI-FR /
                      G:(DE-Ds200)SUC-GSI-DA},
      experiment   = {EXP:(DE-H253)LHC-Exp-ALICE-20150101},
      typ          = {PUB:(DE-HGF)16},
      eprint       = {2101.02581},
      howpublished = {arXiv:2101.02581},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2101.02581;\%\%$},
      UT           = {WOS:000713101800035},
      doi          = {10.1016/j.physletb.2021.136481},
      url          = {https://repository.gsi.de/record/245791},
}