Reply to Comment on"Coherent rho0 photoproduction in bulk matter at high energies"

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In their interesting comment on 'Coherent {rho}0 photoproduction in bulk matter at high energies', Rogers and Strikman point out that, at high energies, q{bar q} dipoles with small separations (d) become more important, and that most of the growth of the cross-section is 'driven by the increasingly large contributions from small size (high mass) configurations'; at photon energies of 10{sup 20} eV, over half of the total cross-section is due to dipoles smaller than 0.25 fm. They state that charm production will increase, and may be as much as 30% of the cross-section. The coherent photoproduction of heavier states requires ... continued below

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Couderc, E. & Klein, S. January 27, 2010.

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In their interesting comment on 'Coherent {rho}0 photoproduction in bulk matter at high energies', Rogers and Strikman point out that, at high energies, q{bar q} dipoles with small separations (d) become more important, and that most of the growth of the cross-section is 'driven by the increasingly large contributions from small size (high mass) configurations'; at photon energies of 10{sup 20} eV, over half of the total cross-section is due to dipoles smaller than 0.25 fm. They state that charm production will increase, and may be as much as 30% of the cross-section. The coherent photoproduction of heavier states requires higher energies than coherent {rho} photoproduction, because the formation length scales as 1/M{sup 2}. For the J/{psi}, the required photon energy is 14 times higher than for the {rho}. We agree that higher-mass states become important at higher energies. However, at this point, additional factors come into play; as we note after Eq. (7), our calculation is only properly normalized when the conversion probability is relatively small. At the energies where coherent production of high mass states is possible, the coherent {rho} production probability is large, and it is necessary to consider reverse reactions such as vector meson 'back-propagation' into real photons. The diagonal transitions found in generalized vector meson dominance, such as from a {rho} to a {phi} or J/{psi} may also become important, and a recursive technique appears needed to solve the problem. To the extent that the higher mass states limit the growth of the low-mass cross-section, coherent {rho} photoproduction will be smaller than we calculated. However, the high-mass fractions quoted by Rogers and Strikman are considerably smaller than the fractional difference between the two hadronic models we considered: the Glauber model and the ERR calculations. The presence of higher mass states in our Glauber calculation would not significantly alter the incoherent photonuclear cross-section in our Fig. 1. However, the subsequent {rho} coherent cross-section would be lower, between the Glauber and ERR curves. In the near future, it should be possible to measure the {rho} and J/{psi} photoproduction cross-section up to quite high energies (PeV photons in the target frame) using ultra-peripheral ion collisions at the LHC, thus reducing these uncertainties, and, more generally, search for signs of a rise in the coherent charm cross-section.

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  • Journal Name: Physical Review Letters

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  • Report No.: LBNL-3154E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 982926
  • Archival Resource Key: ark:/67531/metadc1014838

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  • January 27, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 18, 2017, 10:36 a.m.

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Couderc, E. & Klein, S. Reply to Comment on"Coherent rho0 photoproduction in bulk matter at high energies", article, January 27, 2010; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc1014838/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.