Measurement of the vector analyzing power in elastic electron-proton scattering as a probe of the double virtual Compton amplitude

S. P. Wells; T. Averett; D. Barkhuff; D. H. Beck; E. J. Beise; C. Benson; H. Breuer; R. Carr; S. Covrig; J. DelCorso; G. Dodson; C. Eppstein; M. Farkhondeh; B. W. Filippone; T. A. Forest; P. Frasier; R. Hasty; T. M. Ito; C. Jones; W. Korsch; S. Kowalski; P. Lee; E. Maneva; K. McCarty; R. D. McKeown; J. Mikell; B. Mueller; P. Naik; M. L. Pitt; J. Ritter; V. Savu; D. T. Spayde; M. Sullivan; R. Tieulent; E. Tsentalovich; B. Yang; T. Zwart

doi:10.1103/PhysRevC.63.064001

Measurement of the vector analyzing power in elastic electron-proton scattering as a probe of the double virtual Compton amplitude

S. P. Wells, T. Averett, D. Barkhuff, D. H. Beck, E. J. Beise, C. Benson, H. Breuer, R. Carr, S. Covrig, J. DelCorso, G. Dodson, C. Eppstein, M. Farkhondeh, B. W. Filippone, T. A. Forest, P. Frasier, R. Hasty, T. M. Ito, C. Jones, W. KorschS. Kowalski, P. Lee, E. Maneva, K. McCarty, R. D. McKeown, J. Mikell, B. Mueller, P. Naik, M. L. Pitt, J. Ritter, V. Savu, D. T. Spayde, M. Sullivan, R. Tieulent, E. Tsentalovich, B. Yang, T. Zwart

Physics

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Abstract

We report the first measurement of the vector analyzing power in inclusive transversely polarized elastic electron-proton scattering at Q²=0.1 (GeV/c)² and large scattering angles. This quantity must vanish in the single virtual photon exchange, plane-wave impulse approximation for this reaction, and can therefore provide information on two photon exchange amplitudes for electromagnetic interactions with hadronic systems. The observable we have measured is driven by the imaginary part of the two photon exchange amplitude, the hadronic side of which is simply the Compton amplitude for the proton with two virtual photons. We find a small but nonzero value of A = - 15.4±5.4 ppm.

Original language	English (US)
Article number	064001
Pages (from-to)	640011-640015
Number of pages	5
Journal	Physical Review C - Nuclear Physics
Volume	63
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.63.064001
State	Published - Jun 2001

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Nuclear and High Energy Physics

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Wells, S. P., Averett, T., Barkhuff, D., Beck, D. H., Beise, E. J., Benson, C., Breuer, H., Carr, R., Covrig, S., DelCorso, J., Dodson, G., Eppstein, C., Farkhondeh, M., Filippone, B. W., Forest, T. A., Frasier, P., Hasty, R., Ito, T. M., Jones, C., ... Zwart, T. (2001). Measurement of the vector analyzing power in elastic electron-proton scattering as a probe of the double virtual Compton amplitude. Physical Review C - Nuclear Physics, 63(6), 640011-640015. Article 064001. https://doi.org/10.1103/PhysRevC.63.064001

Wells, SP, Averett, T, Barkhuff, D, Beck, DH, Beise, EJ, Benson, C, Breuer, H, Carr, R, Covrig, S, DelCorso, J, Dodson, G, Eppstein, C, Farkhondeh, M, Filippone, BW, Forest, TA, Frasier, P, Hasty, R, Ito, TM, Jones, C, Korsch, W, Kowalski, S, Lee, P, Maneva, E, McCarty, K, McKeown, RD, Mikell, J, Mueller, B, Naik, P, Pitt, ML, Ritter, J, Savu, V, Spayde, DT, Sullivan, M, Tieulent, R, Tsentalovich, E, Yang, B & Zwart, T 2001, 'Measurement of the vector analyzing power in elastic electron-proton scattering as a probe of the double virtual Compton amplitude', Physical Review C - Nuclear Physics, vol. 63, no. 6, 064001, pp. 640011-640015. https://doi.org/10.1103/PhysRevC.63.064001

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title = "Measurement of the vector analyzing power in elastic electron-proton scattering as a probe of the double virtual Compton amplitude",

abstract = "We report the first measurement of the vector analyzing power in inclusive transversely polarized elastic electron-proton scattering at Q2=0.1 (GeV/c)2 and large scattering angles. This quantity must vanish in the single virtual photon exchange, plane-wave impulse approximation for this reaction, and can therefore provide information on two photon exchange amplitudes for electromagnetic interactions with hadronic systems. The observable we have measured is driven by the imaginary part of the two photon exchange amplitude, the hadronic side of which is simply the Compton amplitude for the proton with two virtual photons. We find a small but nonzero value of A = - 15.4±5.4 ppm.",

author = "Wells, {S. P.} and T. Averett and D. Barkhuff and Beck, {D. H.} and Beise, {E. J.} and C. Benson and H. Breuer and R. Carr and S. Covrig and J. DelCorso and G. Dodson and C. Eppstein and M. Farkhondeh and Filippone, {B. W.} and Forest, {T. A.} and P. Frasier and R. Hasty and Ito, {T. M.} and C. Jones and W. Korsch and S. Kowalski and P. Lee and E. Maneva and K. McCarty and McKeown, {R. D.} and J. Mikell and B. Mueller and P. Naik and Pitt, {M. L.} and J. Ritter and V. Savu and Spayde, {D. T.} and M. Sullivan and R. Tieulent and E. Tsentalovich and B. Yang and T. Zwart",

year = "2001",

month = jun,

doi = "10.1103/PhysRevC.63.064001",

language = "English (US)",

volume = "63",

pages = "640011--640015",

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T1 - Measurement of the vector analyzing power in elastic electron-proton scattering as a probe of the double virtual Compton amplitude

AU - Wells, S. P.

AU - Averett, T.

AU - Barkhuff, D.

AU - Beck, D. H.

AU - Beise, E. J.

AU - Benson, C.

AU - Breuer, H.

AU - Carr, R.

AU - Covrig, S.

AU - DelCorso, J.

AU - Dodson, G.

AU - Eppstein, C.

AU - Farkhondeh, M.

AU - Filippone, B. W.

AU - Forest, T. A.

AU - Frasier, P.

AU - Hasty, R.

AU - Ito, T. M.

AU - Jones, C.

AU - Korsch, W.

AU - Kowalski, S.

AU - Lee, P.

AU - Maneva, E.

AU - McCarty, K.

AU - McKeown, R. D.

AU - Mikell, J.

AU - Mueller, B.

AU - Naik, P.

AU - Pitt, M. L.

AU - Ritter, J.

AU - Savu, V.

AU - Spayde, D. T.

AU - Sullivan, M.

AU - Tieulent, R.

AU - Tsentalovich, E.

AU - Yang, B.

AU - Zwart, T.

PY - 2001/6

Y1 - 2001/6

N2 - We report the first measurement of the vector analyzing power in inclusive transversely polarized elastic electron-proton scattering at Q2=0.1 (GeV/c)2 and large scattering angles. This quantity must vanish in the single virtual photon exchange, plane-wave impulse approximation for this reaction, and can therefore provide information on two photon exchange amplitudes for electromagnetic interactions with hadronic systems. The observable we have measured is driven by the imaginary part of the two photon exchange amplitude, the hadronic side of which is simply the Compton amplitude for the proton with two virtual photons. We find a small but nonzero value of A = - 15.4±5.4 ppm.

AB - We report the first measurement of the vector analyzing power in inclusive transversely polarized elastic electron-proton scattering at Q2=0.1 (GeV/c)2 and large scattering angles. This quantity must vanish in the single virtual photon exchange, plane-wave impulse approximation for this reaction, and can therefore provide information on two photon exchange amplitudes for electromagnetic interactions with hadronic systems. The observable we have measured is driven by the imaginary part of the two photon exchange amplitude, the hadronic side of which is simply the Compton amplitude for the proton with two virtual photons. We find a small but nonzero value of A = - 15.4±5.4 ppm.

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Measurement of the vector analyzing power in elastic electron-proton scattering as a probe of the double virtual Compton amplitude

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