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Title: Semi-inclusive charged-pion electroproduction off protons and deuterons: Cross sections, ratios, and access to the quark-parton model at low energies

Abstract

A large set of cross sections for semi-inclusive electroproduction of charged pions (π ±) from both proton and deuteron targets was measured. The data are in the deep-inelastic scattering region with invariant mass squared W 2 > 4 GeV 2 and range in four-momentum transfer squared 2 < Q 2 < 4 (GeV/c) 2, and cover a range in the Bjorken scaling variable 0.2 < x < 0.6. The fractional energy of the pions spans a range 0.3 < z < 1, with small transverse momenta with respect to the virtual-photon direction, P t 2 < 0.2 (GeV/c) 2. The invariant mass that goes undetected, M x or W', is in the nucleon resonance region, W' < 2 GeV. The new data conclusively show the onset of quark-hadron duality in this process, and the relation of this phenomenon to the high-energy factorization ansatz of electron-quark scattering and subsequent quark → pion production mechanisms. The x, z and P t 2 dependences of several ratios (the ratios of favored-unfavored fragmentation functions, charged pion ratios, deuteron-hydrogen and aluminum-deuteron ratios for π + and π -) have been studied. The ratios are found to be in good agreement with expectations based upon amore » high-energy quark-parton model description. We find the azimuthal dependences to be small, as compared to exclusive pion electroproduction, and consistent with theoretical expectations based on tree-level factorization in terms of transverse-momentum-dependent parton distribution and fragmentation functions. In the context of a simple model, the initial transverse momenta of d quarks are found to be slightly smaller than for u quarks, while the transverse momentum width of the favored fragmentation function is about the same as for the unfavored one, and both fragmentation widths are larger than the quark widths.« less

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1033510
Alternate Identifier(s):
OSTI ID: 1098922
Report Number(s):
JLAB-PHY-11-1381; DOE/OR/23177-1-982; arXiv:1103.1649
Journal ID: ISSN 0556-2813; PRVCAN; TRN: US1200339
Grant/Contract Number:  
FG02-99ER-41065; FG02-04ER41330; AC02-06CH11357; AC05- 84ER40150
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 85; Journal Issue: 1; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CROSS SECTIONS; D QUARKS; DEUTERIUM TARGET; DEUTERONS; DISTRIBUTION; DUALITY; ELECTROPRODUCTION; FACTORIZATION; FRAGMENTATION; NUCLEONS; PIONS; PRODUCTION; PROTONS; QUARKS; RESONANCE; SCATTERING; TRANSVERSE MOMENTUM; U QUARKS

Citation Formats

Asaturyan, R., Ent, R., Mkrtchyan, H., Navasardyan, T., Tadevosyan, V., Adams, G. S., Ahmidouch, A., Angelescu, T., Arrington, J., Asaturyan, A., Baker, O. K., Benmouna, N., Bertoncini, C., Blok, H. P., Boeglin, W. U., Bosted, P. E., Breuer, H., Christy, M. E., Connell, S. H., Cui, Y., Dalton, M. M., Danagoulian, S., Day, D., Dunne, J. A., Dutta, D., El Khayari, N., Fenker, H. C., Frolov, V. V., Gan, L., Gaskell, D., Hafidi, K., Hinton, W., Holt, R. J., Horn, T., Huber, G. M., Hungerford, E., Jiang, X., Jones, M., Joo, K., Kalantarians, N., Kelly, J. J., Keppel, C. E., Kubarovsky, V., Li, Y., Liang, Y., Mack, D., Malace, S. P., Markowitz, P., McGrath, E., McKee, P., Meekins, D. G., Mkrtchyan, A., Moziak, B., Niculescu, G., Niculescu, I., Opper, A. K., Ostapenko, T., Reimer, P. E., Reinhold, J., Roche, J., Rock, S. E., Schulte, E., Segbefia, E., Smith, C., Smith, G. R., Stoler, P., Tang, L., Ungaro, M., Uzzle, A., Vidakovic, S., Villano, A., Vulcan, W. F., Wang, M., Warren, G., Wesselmann, F. R., Wojtsekhowski, B., Wood, S. A., Xu, C., Yuan, L., and Zheng, X. Semi-inclusive charged-pion electroproduction off protons and deuterons: Cross sections, ratios, and access to the quark-parton model at low energies. United States: N. p., 2012. Web. doi:10.1103/PhysRevC.85.015202.
Asaturyan, R., Ent, R., Mkrtchyan, H., Navasardyan, T., Tadevosyan, V., Adams, G. S., Ahmidouch, A., Angelescu, T., Arrington, J., Asaturyan, A., Baker, O. K., Benmouna, N., Bertoncini, C., Blok, H. P., Boeglin, W. U., Bosted, P. E., Breuer, H., Christy, M. E., Connell, S. H., Cui, Y., Dalton, M. M., Danagoulian, S., Day, D., Dunne, J. A., Dutta, D., El Khayari, N., Fenker, H. C., Frolov, V. V., Gan, L., Gaskell, D., Hafidi, K., Hinton, W., Holt, R. J., Horn, T., Huber, G. M., Hungerford, E., Jiang, X., Jones, M., Joo, K., Kalantarians, N., Kelly, J. J., Keppel, C. E., Kubarovsky, V., Li, Y., Liang, Y., Mack, D., Malace, S. P., Markowitz, P., McGrath, E., McKee, P., Meekins, D. G., Mkrtchyan, A., Moziak, B., Niculescu, G., Niculescu, I., Opper, A. K., Ostapenko, T., Reimer, P. E., Reinhold, J., Roche, J., Rock, S. E., Schulte, E., Segbefia, E., Smith, C., Smith, G. R., Stoler, P., Tang, L., Ungaro, M., Uzzle, A., Vidakovic, S., Villano, A., Vulcan, W. F., Wang, M., Warren, G., Wesselmann, F. R., Wojtsekhowski, B., Wood, S. A., Xu, C., Yuan, L., & Zheng, X. Semi-inclusive charged-pion electroproduction off protons and deuterons: Cross sections, ratios, and access to the quark-parton model at low energies. United States. doi:10.1103/PhysRevC.85.015202.
Asaturyan, R., Ent, R., Mkrtchyan, H., Navasardyan, T., Tadevosyan, V., Adams, G. S., Ahmidouch, A., Angelescu, T., Arrington, J., Asaturyan, A., Baker, O. K., Benmouna, N., Bertoncini, C., Blok, H. P., Boeglin, W. U., Bosted, P. E., Breuer, H., Christy, M. E., Connell, S. H., Cui, Y., Dalton, M. M., Danagoulian, S., Day, D., Dunne, J. A., Dutta, D., El Khayari, N., Fenker, H. C., Frolov, V. V., Gan, L., Gaskell, D., Hafidi, K., Hinton, W., Holt, R. J., Horn, T., Huber, G. M., Hungerford, E., Jiang, X., Jones, M., Joo, K., Kalantarians, N., Kelly, J. J., Keppel, C. E., Kubarovsky, V., Li, Y., Liang, Y., Mack, D., Malace, S. P., Markowitz, P., McGrath, E., McKee, P., Meekins, D. G., Mkrtchyan, A., Moziak, B., Niculescu, G., Niculescu, I., Opper, A. K., Ostapenko, T., Reimer, P. E., Reinhold, J., Roche, J., Rock, S. E., Schulte, E., Segbefia, E., Smith, C., Smith, G. R., Stoler, P., Tang, L., Ungaro, M., Uzzle, A., Vidakovic, S., Villano, A., Vulcan, W. F., Wang, M., Warren, G., Wesselmann, F. R., Wojtsekhowski, B., Wood, S. A., Xu, C., Yuan, L., and Zheng, X. Sun . "Semi-inclusive charged-pion electroproduction off protons and deuterons: Cross sections, ratios, and access to the quark-parton model at low energies". United States. doi:10.1103/PhysRevC.85.015202. https://www.osti.gov/servlets/purl/1033510.
@article{osti_1033510,
title = {Semi-inclusive charged-pion electroproduction off protons and deuterons: Cross sections, ratios, and access to the quark-parton model at low energies},
author = {Asaturyan, R. and Ent, R. and Mkrtchyan, H. and Navasardyan, T. and Tadevosyan, V. and Adams, G. S. and Ahmidouch, A. and Angelescu, T. and Arrington, J. and Asaturyan, A. and Baker, O. K. and Benmouna, N. and Bertoncini, C. and Blok, H. P. and Boeglin, W. U. and Bosted, P. E. and Breuer, H. and Christy, M. E. and Connell, S. H. and Cui, Y. and Dalton, M. M. and Danagoulian, S. and Day, D. and Dunne, J. A. and Dutta, D. and El Khayari, N. and Fenker, H. C. and Frolov, V. V. and Gan, L. and Gaskell, D. and Hafidi, K. and Hinton, W. and Holt, R. J. and Horn, T. and Huber, G. M. and Hungerford, E. and Jiang, X. and Jones, M. and Joo, K. and Kalantarians, N. and Kelly, J. J. and Keppel, C. E. and Kubarovsky, V. and Li, Y. and Liang, Y. and Mack, D. and Malace, S. P. and Markowitz, P. and McGrath, E. and McKee, P. and Meekins, D. G. and Mkrtchyan, A. and Moziak, B. and Niculescu, G. and Niculescu, I. and Opper, A. K. and Ostapenko, T. and Reimer, P. E. and Reinhold, J. and Roche, J. and Rock, S. E. and Schulte, E. and Segbefia, E. and Smith, C. and Smith, G. R. and Stoler, P. and Tang, L. and Ungaro, M. and Uzzle, A. and Vidakovic, S. and Villano, A. and Vulcan, W. F. and Wang, M. and Warren, G. and Wesselmann, F. R. and Wojtsekhowski, B. and Wood, S. A. and Xu, C. and Yuan, L. and Zheng, X.},
abstractNote = {A large set of cross sections for semi-inclusive electroproduction of charged pions (π±) from both proton and deuteron targets was measured. The data are in the deep-inelastic scattering region with invariant mass squared W2 > 4 GeV2 and range in four-momentum transfer squared 2 < Q2 < 4 (GeV/c)2, and cover a range in the Bjorken scaling variable 0.2 < x < 0.6. The fractional energy of the pions spans a range 0.3 < z < 1, with small transverse momenta with respect to the virtual-photon direction, Pt2 < 0.2 (GeV/c)2. The invariant mass that goes undetected, Mx or W', is in the nucleon resonance region, W' < 2 GeV. The new data conclusively show the onset of quark-hadron duality in this process, and the relation of this phenomenon to the high-energy factorization ansatz of electron-quark scattering and subsequent quark → pion production mechanisms. The x, z and Pt2 dependences of several ratios (the ratios of favored-unfavored fragmentation functions, charged pion ratios, deuteron-hydrogen and aluminum-deuteron ratios for π+ and π-) have been studied. The ratios are found to be in good agreement with expectations based upon a high-energy quark-parton model description. We find the azimuthal dependences to be small, as compared to exclusive pion electroproduction, and consistent with theoretical expectations based on tree-level factorization in terms of transverse-momentum-dependent parton distribution and fragmentation functions. In the context of a simple model, the initial transverse momenta of d quarks are found to be slightly smaller than for u quarks, while the transverse momentum width of the favored fragmentation function is about the same as for the unfavored one, and both fragmentation widths are larger than the quark widths.},
doi = {10.1103/PhysRevC.85.015202},
journal = {Physical Review. C, Nuclear Physics},
number = 1,
volume = 85,
place = {United States},
year = {2012},
month = {1}
}

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