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Title: Measurement of Exclusive $π^0$ Electroproduction Structure Functions and their Relationship to Transverse Generalized Parton Distributions

Abstract

Exclusive $$\pi^0$$ electroproduction at a beam energy of 5.75 GeV has been measured with the Jefferson Lab CLAS spectrometer. Differential cross sections were measured at more than 1800 kinematic values in $Q^2$, $$x_B$$, $$t$$, and $$\phi_\pi$$, in the $Q^2$ range from 1.0 to 4.6 GeV$^2$$,\ $$-t$ up to 2 GeV$^2$, and $$x_B$$ from 0.1 to 0.58. Structure functions $$\sigma_T +\epsilon \sigma_L, \sigma_{TT}$$ and $$\sigma_{LT}$$ were extracted as functions of $$t$$ for each of 17 combinations of $Q^2$ and $$x_B$$. The data were compared directly with two handbag-based calculations including both longitudinal and transversity GPDs. Inclusion of only longitudinal GPDs very strongly underestimates $$\sigma_T +\epsilon \sigma_L$$ and fails to account for $$\sigma_{TT}$$ and $$\sigma_{LT}$$, while inclusion of transversity GPDs brings the calculations into substantially better agreement with the data. There is very strong sensitivity to the relative contributions of nucleon helicity flip and helicity non-flip processes. The results confirm that exclusive $$\pi^0$$ electroproduction offers direct experimental access to the transversity GPDs.

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1052994
Report Number(s):
JLAB-PHY-12-1595; DOE/OR/23177-2231; arXiv:1206.6355
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Journal Article
Journal Name:
Phys. Rev. Lett.
Additional Journal Information:
Journal Volume: 109; Journal Issue: 11
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Bedlinskiy, Ivan, Niccolai, Silvia, Stoler, Paul, Adhikari, Krishna, Aghasyan, Mher, Amaryan, Moskov, Anghinolfi, Marco, Avagyan, Harutyun, Baghdasaryan, Hovhannes, Ball, Jacques, Baltzell, Nathan, Battaglieri, Marco, Bennett, Robert, Biselli, Angela, Bookwalter, Craig, Boyarinov, Sergey, Briscoe, William, Brooks, Williams, Burkert, Volker, Carman, Daniel, Celentano, Andrea, Chandavar, Shloka, Charles, Gabriel, Contalbrigo, Marco, Crede, Volker, D'Angelo, Annalisa, Daniel, Aji, Dashyan, Natalya, De Vita, Raffaella, De Sanctis, Enzo, Deur, Alexandre, Djalali, Chaden, Doughty, David, Dupre, Raphael, Egiyan, Hovanes, El Alaoui, Ahmed, Elfassi, Lamiaa, Elouadrhiri, Latifa, Eugenio, Paul, Fedotov, Gleb, Fegan, Stuart, Fleming, Jamie, Forest, Tony, Garcon, Michel, Gevorgyan, Nerses, Giovanetti, Kevin, Girod, Francoi-Xavier, Gohn, Wesley, Gothe, Ralf, Graham, Lewis, Griffioen, Keith, Guegan, Baptiste, Guidal, Michel, Guo, Lei, Hafidi, Kawtar, Hakobyan, Hayk, Hanretty, Charles, Heddle, David, Hicks, Kenneth, Holtrop, Maurik, Ilieva, Yordanka, Ireland, David, Ishkhanov, Boris, Isupov, Evgeny, Jo, Hyon-Suk, Joo, Kyungseon, Keller, Dustin, Khanddaker, Mahbubul, Khertarpal, Puneet, Kim, Andrey, Kim, Wooyoung, Klein, Franz, Koirala, Suman, Kubarovsky, A, Kuhn, Sebastian, Kuleshov, Sergey, Kvaltine, Nicholas, Livingston, Kenneth, Lu, Haiyun, MacGregor, Ian, Mao, Yuqing, Markov, Nikolai, Martinez, D, Mayer, Michael, McKinnon, Bryan, Meyer, Curtis, Mineeva, Taisiya, Mirazita, Marco, Mokeev, Viktor, Moutarde, Herve, Munevar Espitia, Edwin, Munoz Camacho, Carlos, Nadel-Turonski, Pawel, Niculescu, Gabriel, Niculescu, Maria-Ioana, Osipenko, Mikhail, Ostrovidov, Alexander, Pappalardo, Luciano, Permuzyan, Rafayel, Park, Kijun, Park, Sungkyun, Pasyuk, Eugene, Pereira, Sergio, Phelps, Evan, Pisano, Silvia, Pogorelko, Oleg, Pozdnyakov, Sergey, Price, John, Procureur, Sebastien, Prok, Yelena, Protopopescu, Dan, Puckett, Andrew, Raue, Brian, Ricco, Giovanni, Rimal, Dipak, Ripani, Marco, Rosner, Guenther, Rossi, Patrizia, Sabatie, Franck, Saini, Mukesh, Salgado, Carlos, Saylor, Nicholas, Schott, Diane, Schumacher, Reinhard, Seder, Erin, Seraydaryan, Heghine, Sharabian, Youri, Smith, Gregory, Sober, Daniel, Sokhan, Daria, Stepanyan, Samuel, Strauch, Steffen, Taiuti, Mauro, Tang, Wei, Taylor, Charles, Tian, Ye, Tkachenko, Svyatoslav, Ungaro, Maurizio, Vineyard, Michael, Vlasov, Alexander, Voskanyan, Hakob, Voutier, Eric, Walford, Natalie, Watts, Daniel, Weinstein, Lawrence, Weygan, Dennis, Wood, Michael, Zachariou, Nicholas, Zhang, Jixie, Zhao, Zhiwen, and Zonta, Irene. Measurement of Exclusive $π^0$ Electroproduction Structure Functions and their Relationship to Transverse Generalized Parton Distributions. United States: N. p., 2012. Web. doi:10.1103/PhysRevLett.109.112001.
Bedlinskiy, Ivan, Niccolai, Silvia, Stoler, Paul, Adhikari, Krishna, Aghasyan, Mher, Amaryan, Moskov, Anghinolfi, Marco, Avagyan, Harutyun, Baghdasaryan, Hovhannes, Ball, Jacques, Baltzell, Nathan, Battaglieri, Marco, Bennett, Robert, Biselli, Angela, Bookwalter, Craig, Boyarinov, Sergey, Briscoe, William, Brooks, Williams, Burkert, Volker, Carman, Daniel, Celentano, Andrea, Chandavar, Shloka, Charles, Gabriel, Contalbrigo, Marco, Crede, Volker, D'Angelo, Annalisa, Daniel, Aji, Dashyan, Natalya, De Vita, Raffaella, De Sanctis, Enzo, Deur, Alexandre, Djalali, Chaden, Doughty, David, Dupre, Raphael, Egiyan, Hovanes, El Alaoui, Ahmed, Elfassi, Lamiaa, Elouadrhiri, Latifa, Eugenio, Paul, Fedotov, Gleb, Fegan, Stuart, Fleming, Jamie, Forest, Tony, Garcon, Michel, Gevorgyan, Nerses, Giovanetti, Kevin, Girod, Francoi-Xavier, Gohn, Wesley, Gothe, Ralf, Graham, Lewis, Griffioen, Keith, Guegan, Baptiste, Guidal, Michel, Guo, Lei, Hafidi, Kawtar, Hakobyan, Hayk, Hanretty, Charles, Heddle, David, Hicks, Kenneth, Holtrop, Maurik, Ilieva, Yordanka, Ireland, David, Ishkhanov, Boris, Isupov, Evgeny, Jo, Hyon-Suk, Joo, Kyungseon, Keller, Dustin, Khanddaker, Mahbubul, Khertarpal, Puneet, Kim, Andrey, Kim, Wooyoung, Klein, Franz, Koirala, Suman, Kubarovsky, A, Kuhn, Sebastian, Kuleshov, Sergey, Kvaltine, Nicholas, Livingston, Kenneth, Lu, Haiyun, MacGregor, Ian, Mao, Yuqing, Markov, Nikolai, Martinez, D, Mayer, Michael, McKinnon, Bryan, Meyer, Curtis, Mineeva, Taisiya, Mirazita, Marco, Mokeev, Viktor, Moutarde, Herve, Munevar Espitia, Edwin, Munoz Camacho, Carlos, Nadel-Turonski, Pawel, Niculescu, Gabriel, Niculescu, Maria-Ioana, Osipenko, Mikhail, Ostrovidov, Alexander, Pappalardo, Luciano, Permuzyan, Rafayel, Park, Kijun, Park, Sungkyun, Pasyuk, Eugene, Pereira, Sergio, Phelps, Evan, Pisano, Silvia, Pogorelko, Oleg, Pozdnyakov, Sergey, Price, John, Procureur, Sebastien, Prok, Yelena, Protopopescu, Dan, Puckett, Andrew, Raue, Brian, Ricco, Giovanni, Rimal, Dipak, Ripani, Marco, Rosner, Guenther, Rossi, Patrizia, Sabatie, Franck, Saini, Mukesh, Salgado, Carlos, Saylor, Nicholas, Schott, Diane, Schumacher, Reinhard, Seder, Erin, Seraydaryan, Heghine, Sharabian, Youri, Smith, Gregory, Sober, Daniel, Sokhan, Daria, Stepanyan, Samuel, Strauch, Steffen, Taiuti, Mauro, Tang, Wei, Taylor, Charles, Tian, Ye, Tkachenko, Svyatoslav, Ungaro, Maurizio, Vineyard, Michael, Vlasov, Alexander, Voskanyan, Hakob, Voutier, Eric, Walford, Natalie, Watts, Daniel, Weinstein, Lawrence, Weygan, Dennis, Wood, Michael, Zachariou, Nicholas, Zhang, Jixie, Zhao, Zhiwen, & Zonta, Irene. Measurement of Exclusive $π^0$ Electroproduction Structure Functions and their Relationship to Transverse Generalized Parton Distributions. United States. https://doi.org/10.1103/PhysRevLett.109.112001
Bedlinskiy, Ivan, Niccolai, Silvia, Stoler, Paul, Adhikari, Krishna, Aghasyan, Mher, Amaryan, Moskov, Anghinolfi, Marco, Avagyan, Harutyun, Baghdasaryan, Hovhannes, Ball, Jacques, Baltzell, Nathan, Battaglieri, Marco, Bennett, Robert, Biselli, Angela, Bookwalter, Craig, Boyarinov, Sergey, Briscoe, William, Brooks, Williams, Burkert, Volker, Carman, Daniel, Celentano, Andrea, Chandavar, Shloka, Charles, Gabriel, Contalbrigo, Marco, Crede, Volker, D'Angelo, Annalisa, Daniel, Aji, Dashyan, Natalya, De Vita, Raffaella, De Sanctis, Enzo, Deur, Alexandre, Djalali, Chaden, Doughty, David, Dupre, Raphael, Egiyan, Hovanes, El Alaoui, Ahmed, Elfassi, Lamiaa, Elouadrhiri, Latifa, Eugenio, Paul, Fedotov, Gleb, Fegan, Stuart, Fleming, Jamie, Forest, Tony, Garcon, Michel, Gevorgyan, Nerses, Giovanetti, Kevin, Girod, Francoi-Xavier, Gohn, Wesley, Gothe, Ralf, Graham, Lewis, Griffioen, Keith, Guegan, Baptiste, Guidal, Michel, Guo, Lei, Hafidi, Kawtar, Hakobyan, Hayk, Hanretty, Charles, Heddle, David, Hicks, Kenneth, Holtrop, Maurik, Ilieva, Yordanka, Ireland, David, Ishkhanov, Boris, Isupov, Evgeny, Jo, Hyon-Suk, Joo, Kyungseon, Keller, Dustin, Khanddaker, Mahbubul, Khertarpal, Puneet, Kim, Andrey, Kim, Wooyoung, Klein, Franz, Koirala, Suman, Kubarovsky, A, Kuhn, Sebastian, Kuleshov, Sergey, Kvaltine, Nicholas, Livingston, Kenneth, Lu, Haiyun, MacGregor, Ian, Mao, Yuqing, Markov, Nikolai, Martinez, D, Mayer, Michael, McKinnon, Bryan, Meyer, Curtis, Mineeva, Taisiya, Mirazita, Marco, Mokeev, Viktor, Moutarde, Herve, Munevar Espitia, Edwin, Munoz Camacho, Carlos, Nadel-Turonski, Pawel, Niculescu, Gabriel, Niculescu, Maria-Ioana, Osipenko, Mikhail, Ostrovidov, Alexander, Pappalardo, Luciano, Permuzyan, Rafayel, Park, Kijun, Park, Sungkyun, Pasyuk, Eugene, Pereira, Sergio, Phelps, Evan, Pisano, Silvia, Pogorelko, Oleg, Pozdnyakov, Sergey, Price, John, Procureur, Sebastien, Prok, Yelena, Protopopescu, Dan, Puckett, Andrew, Raue, Brian, Ricco, Giovanni, Rimal, Dipak, Ripani, Marco, Rosner, Guenther, Rossi, Patrizia, Sabatie, Franck, Saini, Mukesh, Salgado, Carlos, Saylor, Nicholas, Schott, Diane, Schumacher, Reinhard, Seder, Erin, Seraydaryan, Heghine, Sharabian, Youri, Smith, Gregory, Sober, Daniel, Sokhan, Daria, Stepanyan, Samuel, Strauch, Steffen, Taiuti, Mauro, Tang, Wei, Taylor, Charles, Tian, Ye, Tkachenko, Svyatoslav, Ungaro, Maurizio, Vineyard, Michael, Vlasov, Alexander, Voskanyan, Hakob, Voutier, Eric, Walford, Natalie, Watts, Daniel, Weinstein, Lawrence, Weygan, Dennis, Wood, Michael, Zachariou, Nicholas, Zhang, Jixie, Zhao, Zhiwen, and Zonta, Irene. 2012. "Measurement of Exclusive $π^0$ Electroproduction Structure Functions and their Relationship to Transverse Generalized Parton Distributions". United States. https://doi.org/10.1103/PhysRevLett.109.112001.
@article{osti_1052994,
title = {Measurement of Exclusive $π^0$ Electroproduction Structure Functions and their Relationship to Transverse Generalized Parton Distributions},
author = {Bedlinskiy, Ivan and Niccolai, Silvia and Stoler, Paul and Adhikari, Krishna and Aghasyan, Mher and Amaryan, Moskov and Anghinolfi, Marco and Avagyan, Harutyun and Baghdasaryan, Hovhannes and Ball, Jacques and Baltzell, Nathan and Battaglieri, Marco and Bennett, Robert and Biselli, Angela and Bookwalter, Craig and Boyarinov, Sergey and Briscoe, William and Brooks, Williams and Burkert, Volker and Carman, Daniel and Celentano, Andrea and Chandavar, Shloka and Charles, Gabriel and Contalbrigo, Marco and Crede, Volker and D'Angelo, Annalisa and Daniel, Aji and Dashyan, Natalya and De Vita, Raffaella and De Sanctis, Enzo and Deur, Alexandre and Djalali, Chaden and Doughty, David and Dupre, Raphael and Egiyan, Hovanes and El Alaoui, Ahmed and Elfassi, Lamiaa and Elouadrhiri, Latifa and Eugenio, Paul and Fedotov, Gleb and Fegan, Stuart and Fleming, Jamie and Forest, Tony and Garcon, Michel and Gevorgyan, Nerses and Giovanetti, Kevin and Girod, Francoi-Xavier and Gohn, Wesley and Gothe, Ralf and Graham, Lewis and Griffioen, Keith and Guegan, Baptiste and Guidal, Michel and Guo, Lei and Hafidi, Kawtar and Hakobyan, Hayk and Hanretty, Charles and Heddle, David and Hicks, Kenneth and Holtrop, Maurik and Ilieva, Yordanka and Ireland, David and Ishkhanov, Boris and Isupov, Evgeny and Jo, Hyon-Suk and Joo, Kyungseon and Keller, Dustin and Khanddaker, Mahbubul and Khertarpal, Puneet and Kim, Andrey and Kim, Wooyoung and Klein, Franz and Koirala, Suman and Kubarovsky, A and Kuhn, Sebastian and Kuleshov, Sergey and Kvaltine, Nicholas and Livingston, Kenneth and Lu, Haiyun and MacGregor, Ian and Mao, Yuqing and Markov, Nikolai and Martinez, D and Mayer, Michael and McKinnon, Bryan and Meyer, Curtis and Mineeva, Taisiya and Mirazita, Marco and Mokeev, Viktor and Moutarde, Herve and Munevar Espitia, Edwin and Munoz Camacho, Carlos and Nadel-Turonski, Pawel and Niculescu, Gabriel and Niculescu, Maria-Ioana and Osipenko, Mikhail and Ostrovidov, Alexander and Pappalardo, Luciano and Permuzyan, Rafayel and Park, Kijun and Park, Sungkyun and Pasyuk, Eugene and Pereira, Sergio and Phelps, Evan and Pisano, Silvia and Pogorelko, Oleg and Pozdnyakov, Sergey and Price, John and Procureur, Sebastien and Prok, Yelena and Protopopescu, Dan and Puckett, Andrew and Raue, Brian and Ricco, Giovanni and Rimal, Dipak and Ripani, Marco and Rosner, Guenther and Rossi, Patrizia and Sabatie, Franck and Saini, Mukesh and Salgado, Carlos and Saylor, Nicholas and Schott, Diane and Schumacher, Reinhard and Seder, Erin and Seraydaryan, Heghine and Sharabian, Youri and Smith, Gregory and Sober, Daniel and Sokhan, Daria and Stepanyan, Samuel and Strauch, Steffen and Taiuti, Mauro and Tang, Wei and Taylor, Charles and Tian, Ye and Tkachenko, Svyatoslav and Ungaro, Maurizio and Vineyard, Michael and Vlasov, Alexander and Voskanyan, Hakob and Voutier, Eric and Walford, Natalie and Watts, Daniel and Weinstein, Lawrence and Weygan, Dennis and Wood, Michael and Zachariou, Nicholas and Zhang, Jixie and Zhao, Zhiwen and Zonta, Irene},
abstractNote = {Exclusive $\pi^0$ electroproduction at a beam energy of 5.75 GeV has been measured with the Jefferson Lab CLAS spectrometer. Differential cross sections were measured at more than 1800 kinematic values in $Q^2$, $x_B$, $t$, and $\phi_\pi$, in the $Q^2$ range from 1.0 to 4.6 GeV$^2$,\ $-t$ up to 2 GeV$^2$, and $x_B$ from 0.1 to 0.58. Structure functions $\sigma_T +\epsilon \sigma_L, \sigma_{TT}$ and $\sigma_{LT}$ were extracted as functions of $t$ for each of 17 combinations of $Q^2$ and $x_B$. The data were compared directly with two handbag-based calculations including both longitudinal and transversity GPDs. Inclusion of only longitudinal GPDs very strongly underestimates $\sigma_T +\epsilon \sigma_L$ and fails to account for $\sigma_{TT}$ and $\sigma_{LT}$, while inclusion of transversity GPDs brings the calculations into substantially better agreement with the data. There is very strong sensitivity to the relative contributions of nucleon helicity flip and helicity non-flip processes. The results confirm that exclusive $\pi^0$ electroproduction offers direct experimental access to the transversity GPDs.},
doi = {10.1103/PhysRevLett.109.112001},
url = {https://www.osti.gov/biblio/1052994}, journal = {Phys. Rev. Lett.},
number = 11,
volume = 109,
place = {United States},
year = {Sat Sep 01 00:00:00 EDT 2012},
month = {Sat Sep 01 00:00:00 EDT 2012}
}