[Olympus] Fwd: arXiv Replacement -> 1611.04685 in nucl-ex from hasell@mit.edu

[Douglas K Hasell]

Revised version now on the arXiv.

                                                     Cheers,
                                                             Douglas

26-415 M.I.T.                                  Tel: +1 (617) 258-7199
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Cambridge, MA 02139, USA                       E-mail: hasell at mit.edu








> Begin forwarded message:
> 
> From: <e-prints at arxiv.org>
> Subject: arXiv Replacement -> 1611.04685 in nucl-ex from hasell at mit.edu
> Date: December 20, 2016 at 20:12:02 EST
> To: <hasell at mit.edu>
> Reply-To: <help at arxiv.org>
> 
> Your replacement of 1611.04685 by submission submit/1756935 has
> been published and is available at:
> 
> http://arxiv.org/abs/1611.04685
> 
> 
> The paper password for this article is: pacub
> Please share this with your co-authors. They may use it to claim
> ownership.
> 
> 
> Abstract will appear in today's mailing as:
> ------------------------------------------------------------------------------
> \\
> arXiv:1611.04685
> From: Douglas Hasell <hasell at mit.edu>
> Date: Tue, 15 Nov 2016 03:14:35 GMT   (187kb,D)
> Date (revised v2): Tue, 20 Dec 2016 02:32:11 GMT   (265kb,D)
> 
> Title: Hard Two-Photon Contribution to Elastic Lepton-Proton Scattering:
>  Determined by the OLYMPUS Experiment
> Authors: B.S. Henderson and L.D. Ice and D. Khaneft and C. O'Connor and R.
>  Russell and A. Schmidt and J.C. Bernauer and M. Kohl and N. Akopov and R.
>  Alarcon and O. Ates and A. Avetisyan and R. Beck and S. Belostotski and J.
>  Bessuille and F. Brinker and J.R. Calarco and V. Carassiti and E. Cisbani and
>  G. Ciullo and M. Contalbrigo and R. De Leo and J. Diefenbach and T.W.
>  Donnelly and K. Dow and G. Elbakian and P.D. Eversheim and S. Frullani and
>  Ch. Funke and G. Gavrilov and B. Gl\"aser and N. G\"orrissen and D.K. Hasell
>  and J. Hauschildt and Ph. Hoffmeister and Y. Holler and E. Ihloff and A.
>  Izotov and R. Kaiser and G. Karyan and J. Kelsey and A. Kiselev and P.
>  Klassen and A. Krivshich and I. Lehmann and P. Lenisa and D. Lenz and S.
>  Lumsden and Y. Ma and F. Maas and H. Marukyan and O. Miklukho and R.G. Milner
>  and A. Movsisyan and M. Murray and Y. Naryshkin and R. Perez Benito and R.
>  Perrino and R.P. Redwine and D. Rodr\'iguez Pi\~neiro and G. Rosner and U.
>  Schneekloth and B. Seitz and M. Statera and A. Thiel and H. Vardanyan and D.
>  Veretennikov and C. Vidal and A. Winnebeck and V. Yeganov
> Categories: nucl-ex
> Comments: 5 pages, 3 figures, 2 tables
> License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
> \\
>  The OLYMPUS collaboration reports on a precision measurement of the
> positron-proton to electron-proton elastic cross section ratio, $R_{2\gamma}$,
> a direct measure of the contribution of hard two-photon exchange to the elastic
> cross section. In the OLYMPUS measurement, 2.01~GeV electron and positron beams
> were directed through a hydrogen gas target internal to the DORIS storage ring
> at DESY. A toroidal magnetic spectrometer instrumented with drift chambers and
> time-of-flight scintillators detected elastically scattered leptons in
> coincidence with recoiling protons over a scattering angle range of $\approx
> 20\degree$ to $80\degree$. The relative luminosity between the two beam species
> was monitored using tracking telescopes of interleaved GEM and MWPC detectors
> at $12\degree$, as well as symmetric M{\o}ller/Bhabha calorimeters at
> $1.29\degree$. A total integrated luminosity of 4.5~fb$^{-1}$ was collected. In
> the extraction of $R_{2\gamma}$, radiative effects were taken into account
> using a Monte Carlo generator to simulate the convolutions of internal
> bremsstrahlung with experiment-specific conditions such as detector acceptance
> and reconstruction efficiency. The resulting values of $R_{2\gamma}$, presented
> here for a wide range of virtual photon polarization $0.456<\epsilon<0.978$,
> are smaller than some hadronic two-photon exchange calculations predict, but
> are in reasonable agreement with a subtracted dispersion model and a
> phenomenological fit to the form factor data.
> \\
> 
> 
> Contains:
> diffblunden.pdf: 73474 bytes
> r2gamma_1mot.pdf: 90948 bytes
> rad_corr_compare.pdf: 94440 bytes
> tpeprl.bbl: 23347 bytes
> tpeprl.tex: 29074 bytes
> 
> 

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