Separated response functions in exclusive, forward π ± electroproduction on deuterium

Background: Measurements of forward exclusive meson production at different squared four-momenta of the exchanged virtual photon, Q2, and at different four-momentum transfer, t, can be used to probe QCD's transition from meson-nucleon degrees of freedom at long distances to quark-gluon degrees...

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Veröffentlicht in:	Physical review. C, Nuclear physics Nuclear physics, 2015-01, Vol.91 (1), Article 015202
Hauptverfasser:	Huber, G. M., Blok, H. P., Butuceanu, C., Gaskell, D., Horn, T., Mack, D. J., Abbott, D., Aniol, K., Anklin, H., Armstrong, C., Arrington, J., Assamagan, K., Avery, S., Baker, O. K., Barrett, B., Beise, E. J., Bochna, C., Boeglin, W., Brash, E. J., Breuer, H., Chang, C. C., Chant, N., Christy, M. E., Dunne, J., Eden, T., Ent, R., Fenker, H., Gibson, E. F., Gilman, R., Gustafsson, K., Hinton, W., Holt, R. J., Jackson, H., Jin, S., Jones, M. K., Keppel, C. E., Kim, P. H., Kim, W., King, P. M., Klein, A., Koltenuk, D., Kovaltchouk, V., Liang, M., Liu, J., Lolos, G. J., Lung, A., Margaziotis, D. J., Markowitz, P., Matsumura, A., McKee, D., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mueller, B., Niculescu, G., Niculescu, I., Okayasu, Y., Pentchev, L., Perdrisat, C., Pitz, D., Potterveld, D., Punjabi, V., Qin, L. M., Reimer, P. E., Reinhold, J., Roche, J., Roos, P. G., Sarty, A., Shin, I. K., Smith, G. R., Stepanyan, S., Tang, L. G., Tadevosyan, V., Tvaskis, V., van der Meer, R. L. J., Vansyoc, K., Van Westrum, D., Vidakovic, S., Volmer, J., Vulcan, W., Warren, G., Wood, S. A., Xu, C., Yan, C., Zhao, W.-X., Zheng, X., Zihlmann, B.
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Sprache:	eng
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creator	Huber, G. M. Blok, H. P. Butuceanu, C. Gaskell, D. Horn, T. Mack, D. J. Abbott, D. Aniol, K. Anklin, H. Armstrong, C. Arrington, J. Assamagan, K. Avery, S. Baker, O. K. Barrett, B. Beise, E. J. Bochna, C. Boeglin, W. Brash, E. J. Breuer, H. Chang, C. C. Chant, N. Christy, M. E. Dunne, J. Eden, T. Ent, R. Fenker, H. Gibson, E. F. Gilman, R. Gustafsson, K. Hinton, W. Holt, R. J. Jackson, H. Jin, S. Jones, M. K. Keppel, C. E. Kim, P. H. Kim, W. King, P. M. Klein, A. Koltenuk, D. Kovaltchouk, V. Liang, M. Liu, J. Lolos, G. J. Lung, A. Margaziotis, D. J. Markowitz, P. Matsumura, A. McKee, D. Meekins, D. Mitchell, J. Miyoshi, T. Mkrtchyan, H. Mueller, B. Niculescu, G. Niculescu, I. Okayasu, Y. Pentchev, L. Perdrisat, C. Pitz, D. Potterveld, D. Punjabi, V. Qin, L. M. Reimer, P. E. Reinhold, J. Roche, J. Roos, P. G. Sarty, A. Shin, I. K. Smith, G. R. Stepanyan, S. Tang, L. G. Tadevosyan, V. Tvaskis, V. van der Meer, R. L. J. Vansyoc, K. Van Westrum, D. Vidakovic, S. Volmer, J. Vulcan, W. Warren, G. Wood, S. A. Xu, C. Yan, C. Zhao, W.-X. Zheng, X. Zihlmann, B.
description	Background: Measurements of forward exclusive meson production at different squared four-momenta of the exchanged virtual photon, Q2, and at different four-momentum transfer, t, can be used to probe QCD's transition from meson-nucleon degrees of freedom at long distances to quark-gluon degrees of freedom at short scales. Ratios of separated response functions in π⁻ and π⁺ electroproduction are particularly informative. Ratio for transverse photons may allow this transition to be more easily observed, while the ratio for longitudinal photons provides a crucial verification of the assumed pole dominance, needed for reliable extraction of the pion form factor from electroproduction data. Method: Data were acquired with 2.6-5.2 GeV electron beams and the HMS+SOS spectrometers in Jefferson Lab Hall C, at central Q2 values of 0.6, 1.0, 1.6 GeV2 at W=1.95 GeV, and Q2=2.45 GeV2 at W=2.22 GeV. There was significant coverage in Φ And ϵ, which allowed separation of σL,T,LT,TT. Results: σL shows a clear signature of the pion pole, with a sharp rise at small -t. In contrast, σT is much flatter versus t. The longitudinal/transverse ratios evolve with Q2 and t, and at the highest Q2=2.45 GeV2 show a slight enhancement for π⁻ Production compared to π⁺. The π⁻/π⁺+ ratio for transverse photons exhibits only a small Q2-dependence, following a nearly universal curve with t, with a steep transition to a value of about 0.25, consistent with s-channel quark knockout. The σTT/σT ratio also drops rapidly with Q2, qualitatively consistent with s-channel helicity conservation. The π⁻/π⁺ ratio for longitudinal photons indicates a small isoscalar contamination at W=1.95 GeV, consistent with what was observed in our earlier determination of the pion form factor at these kinematics.
doi_str_mv	10.1103/PhysRevC.91.015202
format	Article
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M. ; Blok, H. P. ; Butuceanu, C. ; Gaskell, D. ; Horn, T. ; Mack, D. J. ; Abbott, D. ; Aniol, K. ; Anklin, H. ; Armstrong, C. ; Arrington, J. ; Assamagan, K. ; Avery, S. ; Baker, O. K. ; Barrett, B. ; Beise, E. J. ; Bochna, C. ; Boeglin, W. ; Brash, E. J. ; Breuer, H. ; Chang, C. C. ; Chant, N. ; Christy, M. E. ; Dunne, J. ; Eden, T. ; Ent, R. ; Fenker, H. ; Gibson, E. F. ; Gilman, R. ; Gustafsson, K. ; Hinton, W. ; Holt, R. J. ; Jackson, H. ; Jin, S. ; Jones, M. K. ; Keppel, C. E. ; Kim, P. H. ; Kim, W. ; King, P. M. ; Klein, A. ; Koltenuk, D. ; Kovaltchouk, V. ; Liang, M. ; Liu, J. ; Lolos, G. J. ; Lung, A. ; Margaziotis, D. J. ; Markowitz, P. ; Matsumura, A. ; McKee, D. ; Meekins, D. ; Mitchell, J. ; Miyoshi, T. ; Mkrtchyan, H. ; Mueller, B. ; Niculescu, G. ; Niculescu, I. ; Okayasu, Y. ; Pentchev, L. ; Perdrisat, C. ; Pitz, D. ; Potterveld, D. ; Punjabi, V. ; Qin, L. M. ; Reimer, P. E. ; Reinhold, J. ; Roche, J. ; Roos, P. G. ; Sarty, A. ; Shin, I. K. ; Smith, G. R. ; Stepanyan, S. ; Tang, L. G. ; Tadevosyan, V. ; Tvaskis, V. ; van der Meer, R. L. J. ; Vansyoc, K. ; Van Westrum, D. ; Vidakovic, S. ; Volmer, J. ; Vulcan, W. ; Warren, G. ; Wood, S. A. ; Xu, C. ; Yan, C. ; Zhao, W.-X. ; Zheng, X. ; Zihlmann, B.</creator><creatorcontrib>Huber, G. M. ; Blok, H. P. ; Butuceanu, C. ; Gaskell, D. ; Horn, T. ; Mack, D. J. ; Abbott, D. ; Aniol, K. ; Anklin, H. ; Armstrong, C. ; Arrington, J. ; Assamagan, K. ; Avery, S. ; Baker, O. K. ; Barrett, B. ; Beise, E. J. ; Bochna, C. ; Boeglin, W. ; Brash, E. J. ; Breuer, H. ; Chang, C. C. ; Chant, N. ; Christy, M. E. ; Dunne, J. ; Eden, T. ; Ent, R. ; Fenker, H. ; Gibson, E. F. ; Gilman, R. ; Gustafsson, K. ; Hinton, W. ; Holt, R. J. ; Jackson, H. ; Jin, S. ; Jones, M. K. ; Keppel, C. E. ; Kim, P. H. ; Kim, W. ; King, P. M. ; Klein, A. ; Koltenuk, D. ; Kovaltchouk, V. ; Liang, M. ; Liu, J. ; Lolos, G. J. ; Lung, A. ; Margaziotis, D. J. ; Markowitz, P. ; Matsumura, A. ; McKee, D. ; Meekins, D. ; Mitchell, J. ; Miyoshi, T. ; Mkrtchyan, H. ; Mueller, B. ; Niculescu, G. ; Niculescu, I. ; Okayasu, Y. ; Pentchev, L. ; Perdrisat, C. ; Pitz, D. ; Potterveld, D. ; Punjabi, V. ; Qin, L. M. ; Reimer, P. E. ; Reinhold, J. ; Roche, J. ; Roos, P. G. ; Sarty, A. ; Shin, I. K. ; Smith, G. R. ; Stepanyan, S. ; Tang, L. G. ; Tadevosyan, V. ; Tvaskis, V. ; van der Meer, R. L. J. ; Vansyoc, K. ; Van Westrum, D. ; Vidakovic, S. ; Volmer, J. ; Vulcan, W. ; Warren, G. ; Wood, S. A. ; Xu, C. ; Yan, C. ; Zhao, W.-X. ; Zheng, X. ; Zihlmann, B. ; Jefferson Lab F_{π} Collaboration ; Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)</creatorcontrib><description>Background: Measurements of forward exclusive meson production at different squared four-momenta of the exchanged virtual photon, Q2, and at different four-momentum transfer, t, can be used to probe QCD's transition from meson-nucleon degrees of freedom at long distances to quark-gluon degrees of freedom at short scales. Ratios of separated response functions in π⁻ and π⁺ electroproduction are particularly informative. Ratio for transverse photons may allow this transition to be more easily observed, while the ratio for longitudinal photons provides a crucial verification of the assumed pole dominance, needed for reliable extraction of the pion form factor from electroproduction data. Method: Data were acquired with 2.6-5.2 GeV electron beams and the HMS+SOS spectrometers in Jefferson Lab Hall C, at central Q2 values of 0.6, 1.0, 1.6 GeV2 at W=1.95 GeV, and Q2=2.45 GeV2 at W=2.22 GeV. There was significant coverage in Φ And ϵ, which allowed separation of σL,T,LT,TT. Results: σL shows a clear signature of the pion pole, with a sharp rise at small -t. In contrast, σT is much flatter versus t. The longitudinal/transverse ratios evolve with Q2 and t, and at the highest Q2=2.45 GeV2 show a slight enhancement for π⁻ Production compared to π⁺. The π⁻/π⁺+ ratio for transverse photons exhibits only a small Q2-dependence, following a nearly universal curve with t, with a steep transition to a value of about 0.25, consistent with s-channel quark knockout. The σTT/σT ratio also drops rapidly with Q2, qualitatively consistent with s-channel helicity conservation. The π⁻/π⁺ ratio for longitudinal photons indicates a small isoscalar contamination at W=1.95 GeV, consistent with what was observed in our earlier determination of the pion form factor at these kinematics.</description><identifier>ISSN: 0556-2813</identifier><identifier>EISSN: 1089-490X</identifier><identifier>DOI: 10.1103/PhysRevC.91.015202</identifier><language>eng</language><publisher>United States: American Physical Society (APS)</publisher><subject>NUCLEAR PHYSICS AND RADIATION PHYSICS</subject><ispartof>Physical review. 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J.</creatorcontrib><creatorcontrib>Markowitz, P.</creatorcontrib><creatorcontrib>Matsumura, A.</creatorcontrib><creatorcontrib>McKee, D.</creatorcontrib><creatorcontrib>Meekins, D.</creatorcontrib><creatorcontrib>Mitchell, J.</creatorcontrib><creatorcontrib>Miyoshi, T.</creatorcontrib><creatorcontrib>Mkrtchyan, H.</creatorcontrib><creatorcontrib>Mueller, B.</creatorcontrib><creatorcontrib>Niculescu, G.</creatorcontrib><creatorcontrib>Niculescu, I.</creatorcontrib><creatorcontrib>Okayasu, Y.</creatorcontrib><creatorcontrib>Pentchev, L.</creatorcontrib><creatorcontrib>Perdrisat, C.</creatorcontrib><creatorcontrib>Pitz, D.</creatorcontrib><creatorcontrib>Potterveld, D.</creatorcontrib><creatorcontrib>Punjabi, V.</creatorcontrib><creatorcontrib>Qin, L. M.</creatorcontrib><creatorcontrib>Reimer, P. E.</creatorcontrib><creatorcontrib>Reinhold, J.</creatorcontrib><creatorcontrib>Roche, J.</creatorcontrib><creatorcontrib>Roos, P. G.</creatorcontrib><creatorcontrib>Sarty, A.</creatorcontrib><creatorcontrib>Shin, I. K.</creatorcontrib><creatorcontrib>Smith, G. R.</creatorcontrib><creatorcontrib>Stepanyan, S.</creatorcontrib><creatorcontrib>Tang, L. G.</creatorcontrib><creatorcontrib>Tadevosyan, V.</creatorcontrib><creatorcontrib>Tvaskis, V.</creatorcontrib><creatorcontrib>van der Meer, R. L. J.</creatorcontrib><creatorcontrib>Vansyoc, K.</creatorcontrib><creatorcontrib>Van Westrum, D.</creatorcontrib><creatorcontrib>Vidakovic, S.</creatorcontrib><creatorcontrib>Volmer, J.</creatorcontrib><creatorcontrib>Vulcan, W.</creatorcontrib><creatorcontrib>Warren, G.</creatorcontrib><creatorcontrib>Wood, S. A.</creatorcontrib><creatorcontrib>Xu, C.</creatorcontrib><creatorcontrib>Yan, C.</creatorcontrib><creatorcontrib>Zhao, W.-X.</creatorcontrib><creatorcontrib>Zheng, X.</creatorcontrib><creatorcontrib>Zihlmann, B.</creatorcontrib><creatorcontrib>Jefferson Lab F_{π} Collaboration</creatorcontrib><creatorcontrib>Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)</creatorcontrib><title>Separated response functions in exclusive, forward π ± electroproduction on deuterium</title><title>Physical review. C, Nuclear physics</title><description>Background: Measurements of forward exclusive meson production at different squared four-momenta of the exchanged virtual photon, Q2, and at different four-momentum transfer, t, can be used to probe QCD's transition from meson-nucleon degrees of freedom at long distances to quark-gluon degrees of freedom at short scales. Ratios of separated response functions in π⁻ and π⁺ electroproduction are particularly informative. Ratio for transverse photons may allow this transition to be more easily observed, while the ratio for longitudinal photons provides a crucial verification of the assumed pole dominance, needed for reliable extraction of the pion form factor from electroproduction data. Method: Data were acquired with 2.6-5.2 GeV electron beams and the HMS+SOS spectrometers in Jefferson Lab Hall C, at central Q2 values of 0.6, 1.0, 1.6 GeV2 at W=1.95 GeV, and Q2=2.45 GeV2 at W=2.22 GeV. There was significant coverage in Φ And ϵ, which allowed separation of σL,T,LT,TT. Results: σL shows a clear signature of the pion pole, with a sharp rise at small -t. In contrast, σT is much flatter versus t. The longitudinal/transverse ratios evolve with Q2 and t, and at the highest Q2=2.45 GeV2 show a slight enhancement for π⁻ Production compared to π⁺. The π⁻/π⁺+ ratio for transverse photons exhibits only a small Q2-dependence, following a nearly universal curve with t, with a steep transition to a value of about 0.25, consistent with s-channel quark knockout. The σTT/σT ratio also drops rapidly with Q2, qualitatively consistent with s-channel helicity conservation. The π⁻/π⁺ ratio for longitudinal photons indicates a small isoscalar contamination at W=1.95 GeV, consistent with what was observed in our earlier determination of the pion form factor at these kinematics.</description><subject>NUCLEAR PHYSICS AND RADIATION PHYSICS</subject><issn>0556-2813</issn><issn>1089-490X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNo1kM1KxDAQx4MouK6-gKfg2a6ZpGmboyx-wYLiB3oL2WTCVnabkrTq3nwlX8EX8JWsrg4z_OfwYxh-hBwCmwAwcXKzWKdbfJlOFEwYSM74FhkBq1SWK_a0TUZMyiLjFYhdspfSMxtKiGJEHu-wNdF06GjE1IYmIfV9Y7t6WGndUHyzyz7VL3hMfYivJjr69U4_Pygu0XYxtDG4_henQzvsO4x1v9onO94sEx785Zg8nJ_dTy-z2fXF1fR0llle5l0mc185yZUvHXgzjJdg3dwUBVTMepZLmDsUZc7AC1kwYX0u7VwpVZTc5yDG5GhzN6Su1snWHdqFDU0zPKcBihKYHCC-gWwMKUX0uo31ysS1BqZ__Ol_f1qB3vgT316saAY</recordid><startdate>20150107</startdate><enddate>20150107</enddate><creator>Huber, G. M.</creator><creator>Blok, H. 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A.</creator><creator>Xu, C.</creator><creator>Yan, C.</creator><creator>Zhao, W.-X.</creator><creator>Zheng, X.</creator><creator>Zihlmann, B.</creator><general>American Physical Society (APS)</general><scope>AAYXX</scope><scope>CITATION</scope><scope>OIOZB</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000000256581065</orcidid></search><sort><creationdate>20150107</creationdate><title>Separated response functions in exclusive, forward π ± electroproduction on deuterium</title><author>Huber, G. M. ; Blok, H. P. ; Butuceanu, C. ; Gaskell, D. ; Horn, T. ; Mack, D. J. ; Abbott, D. ; Aniol, K. ; Anklin, H. ; Armstrong, C. ; Arrington, J. ; Assamagan, K. ; Avery, S. ; Baker, O. K. ; Barrett, B. ; Beise, E. J. ; Bochna, C. ; Boeglin, W. ; Brash, E. J. ; Breuer, H. ; Chang, C. C. ; Chant, N. ; Christy, M. E. ; Dunne, J. ; Eden, T. ; Ent, R. ; Fenker, H. ; Gibson, E. F. ; Gilman, R. ; Gustafsson, K. ; Hinton, W. ; Holt, R. J. ; Jackson, H. ; Jin, S. ; Jones, M. K. ; Keppel, C. E. ; Kim, P. H. ; Kim, W. ; King, P. M. ; Klein, A. ; Koltenuk, D. ; Kovaltchouk, V. ; Liang, M. ; Liu, J. ; Lolos, G. J. ; Lung, A. ; Margaziotis, D. J. ; Markowitz, P. ; Matsumura, A. ; McKee, D. ; Meekins, D. ; Mitchell, J. ; Miyoshi, T. ; Mkrtchyan, H. ; Mueller, B. ; Niculescu, G. ; Niculescu, I. ; Okayasu, Y. ; Pentchev, L. ; Perdrisat, C. ; Pitz, D. ; Potterveld, D. ; Punjabi, V. ; Qin, L. M. ; Reimer, P. E. ; Reinhold, J. ; Roche, J. ; Roos, P. G. ; Sarty, A. ; Shin, I. K. ; Smith, G. R. ; Stepanyan, S. ; Tang, L. G. ; Tadevosyan, V. ; Tvaskis, V. ; van der Meer, R. L. J. ; Vansyoc, K. ; Van Westrum, D. ; Vidakovic, S. ; Volmer, J. ; Vulcan, W. ; Warren, G. ; Wood, S. A. ; Xu, C. ; Yan, C. ; Zhao, W.-X. ; Zheng, X. ; Zihlmann, B.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c274t-54f8d529f7d1fad1ff51cdba66180cf0451bde37401f35603cf45cb999672f413</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>NUCLEAR PHYSICS AND RADIATION PHYSICS</topic><toplevel>online_resources</toplevel><creatorcontrib>Huber, G. M.</creatorcontrib><creatorcontrib>Blok, H. P.</creatorcontrib><creatorcontrib>Butuceanu, C.</creatorcontrib><creatorcontrib>Gaskell, D.</creatorcontrib><creatorcontrib>Horn, T.</creatorcontrib><creatorcontrib>Mack, D. 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J.</creatorcontrib><creatorcontrib>Markowitz, P.</creatorcontrib><creatorcontrib>Matsumura, A.</creatorcontrib><creatorcontrib>McKee, D.</creatorcontrib><creatorcontrib>Meekins, D.</creatorcontrib><creatorcontrib>Mitchell, J.</creatorcontrib><creatorcontrib>Miyoshi, T.</creatorcontrib><creatorcontrib>Mkrtchyan, H.</creatorcontrib><creatorcontrib>Mueller, B.</creatorcontrib><creatorcontrib>Niculescu, G.</creatorcontrib><creatorcontrib>Niculescu, I.</creatorcontrib><creatorcontrib>Okayasu, Y.</creatorcontrib><creatorcontrib>Pentchev, L.</creatorcontrib><creatorcontrib>Perdrisat, C.</creatorcontrib><creatorcontrib>Pitz, D.</creatorcontrib><creatorcontrib>Potterveld, D.</creatorcontrib><creatorcontrib>Punjabi, V.</creatorcontrib><creatorcontrib>Qin, L. M.</creatorcontrib><creatorcontrib>Reimer, P. E.</creatorcontrib><creatorcontrib>Reinhold, J.</creatorcontrib><creatorcontrib>Roche, J.</creatorcontrib><creatorcontrib>Roos, P. 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A.</creatorcontrib><creatorcontrib>Xu, C.</creatorcontrib><creatorcontrib>Yan, C.</creatorcontrib><creatorcontrib>Zhao, W.-X.</creatorcontrib><creatorcontrib>Zheng, X.</creatorcontrib><creatorcontrib>Zihlmann, B.</creatorcontrib><creatorcontrib>Jefferson Lab F_{π} Collaboration</creatorcontrib><creatorcontrib>Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV - Hybrid</collection><collection>OSTI.GOV</collection><jtitle>Physical review. C, Nuclear physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Huber, G. M.</au><au>Blok, H. P.</au><au>Butuceanu, C.</au><au>Gaskell, D.</au><au>Horn, T.</au><au>Mack, D. J.</au><au>Abbott, D.</au><au>Aniol, K.</au><au>Anklin, H.</au><au>Armstrong, C.</au><au>Arrington, J.</au><au>Assamagan, K.</au><au>Avery, S.</au><au>Baker, O. K.</au><au>Barrett, B.</au><au>Beise, E. J.</au><au>Bochna, C.</au><au>Boeglin, W.</au><au>Brash, E. J.</au><au>Breuer, H.</au><au>Chang, C. C.</au><au>Chant, N.</au><au>Christy, M. E.</au><au>Dunne, J.</au><au>Eden, T.</au><au>Ent, R.</au><au>Fenker, H.</au><au>Gibson, E. F.</au><au>Gilman, R.</au><au>Gustafsson, K.</au><au>Hinton, W.</au><au>Holt, R. J.</au><au>Jackson, H.</au><au>Jin, S.</au><au>Jones, M. K.</au><au>Keppel, C. E.</au><au>Kim, P. H.</au><au>Kim, W.</au><au>King, P. M.</au><au>Klein, A.</au><au>Koltenuk, D.</au><au>Kovaltchouk, V.</au><au>Liang, M.</au><au>Liu, J.</au><au>Lolos, G. J.</au><au>Lung, A.</au><au>Margaziotis, D. J.</au><au>Markowitz, P.</au><au>Matsumura, A.</au><au>McKee, D.</au><au>Meekins, D.</au><au>Mitchell, J.</au><au>Miyoshi, T.</au><au>Mkrtchyan, H.</au><au>Mueller, B.</au><au>Niculescu, G.</au><au>Niculescu, I.</au><au>Okayasu, Y.</au><au>Pentchev, L.</au><au>Perdrisat, C.</au><au>Pitz, D.</au><au>Potterveld, D.</au><au>Punjabi, V.</au><au>Qin, L. M.</au><au>Reimer, P. E.</au><au>Reinhold, J.</au><au>Roche, J.</au><au>Roos, P. G.</au><au>Sarty, A.</au><au>Shin, I. K.</au><au>Smith, G. R.</au><au>Stepanyan, S.</au><au>Tang, L. G.</au><au>Tadevosyan, V.</au><au>Tvaskis, V.</au><au>van der Meer, R. L. J.</au><au>Vansyoc, K.</au><au>Van Westrum, D.</au><au>Vidakovic, S.</au><au>Volmer, J.</au><au>Vulcan, W.</au><au>Warren, G.</au><au>Wood, S. A.</au><au>Xu, C.</au><au>Yan, C.</au><au>Zhao, W.-X.</au><au>Zheng, X.</au><au>Zihlmann, B.</au><aucorp>Jefferson Lab F_{π} Collaboration</aucorp><aucorp>Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Separated response functions in exclusive, forward π ± electroproduction on deuterium</atitle><jtitle>Physical review. C, Nuclear physics</jtitle><date>2015-01-07</date><risdate>2015</risdate><volume>91</volume><issue>1</issue><artnum>015202</artnum><issn>0556-2813</issn><eissn>1089-490X</eissn><abstract>Background: Measurements of forward exclusive meson production at different squared four-momenta of the exchanged virtual photon, Q2, and at different four-momentum transfer, t, can be used to probe QCD's transition from meson-nucleon degrees of freedom at long distances to quark-gluon degrees of freedom at short scales. Ratios of separated response functions in π⁻ and π⁺ electroproduction are particularly informative. Ratio for transverse photons may allow this transition to be more easily observed, while the ratio for longitudinal photons provides a crucial verification of the assumed pole dominance, needed for reliable extraction of the pion form factor from electroproduction data. Method: Data were acquired with 2.6-5.2 GeV electron beams and the HMS+SOS spectrometers in Jefferson Lab Hall C, at central Q2 values of 0.6, 1.0, 1.6 GeV2 at W=1.95 GeV, and Q2=2.45 GeV2 at W=2.22 GeV. There was significant coverage in Φ And ϵ, which allowed separation of σL,T,LT,TT. Results: σL shows a clear signature of the pion pole, with a sharp rise at small -t. In contrast, σT is much flatter versus t. The longitudinal/transverse ratios evolve with Q2 and t, and at the highest Q2=2.45 GeV2 show a slight enhancement for π⁻ Production compared to π⁺. The π⁻/π⁺+ ratio for transverse photons exhibits only a small Q2-dependence, following a nearly universal curve with t, with a steep transition to a value of about 0.25, consistent with s-channel quark knockout. The σTT/σT ratio also drops rapidly with Q2, qualitatively consistent with s-channel helicity conservation. The π⁻/π⁺ ratio for longitudinal photons indicates a small isoscalar contamination at W=1.95 GeV, consistent with what was observed in our earlier determination of the pion form factor at these kinematics.</abstract><cop>United States</cop><pub>American Physical Society (APS)</pub><doi>10.1103/PhysRevC.91.015202</doi><orcidid>https://orcid.org/0000000256581065</orcidid><oa>free_for_read</oa></addata></record>
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subjects	NUCLEAR PHYSICS AND RADIATION PHYSICS
title	Separated response functions in exclusive, forward π ± electroproduction on deuterium
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