Measurement of semi-inclusive pi(+) electroproduction off the proton
Semi-inclusive π+ [pi superscript +] electroproduction on protons has been measured with the CLAS detector at Jefferson Lab. The measurement was performed on a liquid-hydrogen target using a 5.75 GeV electron beam. The complete five-fold differential cross sections were measured over a wide kinemati...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2011
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| Online Access: | http://hdl.handle.net/1721.1/65096 |
| _version_ | 1811077806391558144 |
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| author | Skabelin, Alexander V. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Skabelin, Alexander V. |
| author_sort | Skabelin, Alexander V. |
| collection | MIT |
| description | Semi-inclusive π+ [pi superscript +] electroproduction on protons has been measured with the CLAS detector at Jefferson Lab. The measurement was performed on a liquid-hydrogen target using a 5.75 GeV electron beam. The complete five-fold differential cross sections were measured over a wide kinematic range including the complete range of azimuthal angles between hadronic and leptonic planes, ϕ [phi], enabling us to separate the ϕ-dependent [phi-dependent] terms. Our measurements of the ϕ-independent [phi-independent] term of the cross section at low Bjorken x were found to be in fairly good agreement with pQCD calculations. Indeed, the conventional current fragmentation calculation can account for almost all of the observed cross section, even at small π+ [pi superscript +] momentum. The measured center-of-momentum spectra are in qualitative agreement with high-energy data, which suggests a surprising numerical similarity between the spectator diquark fragmentation in the present reaction and the antiquark fragmentation measured in e+e- [e superscript + e superscript -] collisions. We have observed that the two ϕ-dependent [phi-dependent] terms of the cross section are small. Within our precision the cos2ϕ [cos 2 phi] term is compatible with zero, except for the low-z region, and the measured cosϕ [cos phi]term is much smaller in magnitude than the sum of the Cahn and Berger effects. |
| first_indexed | 2024-09-23T10:48:40Z |
| format | Article |
| id | mit-1721.1/65096 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:48:40Z |
| publishDate | 2011 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/650962022-09-27T15:10:00Z Measurement of semi-inclusive pi(+) electroproduction off the proton Skabelin, Alexander V. Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Skabelin, Alexander V. Skabelin, Alexander V. Semi-inclusive π+ [pi superscript +] electroproduction on protons has been measured with the CLAS detector at Jefferson Lab. The measurement was performed on a liquid-hydrogen target using a 5.75 GeV electron beam. The complete five-fold differential cross sections were measured over a wide kinematic range including the complete range of azimuthal angles between hadronic and leptonic planes, ϕ [phi], enabling us to separate the ϕ-dependent [phi-dependent] terms. Our measurements of the ϕ-independent [phi-independent] term of the cross section at low Bjorken x were found to be in fairly good agreement with pQCD calculations. Indeed, the conventional current fragmentation calculation can account for almost all of the observed cross section, even at small π+ [pi superscript +] momentum. The measured center-of-momentum spectra are in qualitative agreement with high-energy data, which suggests a surprising numerical similarity between the spectator diquark fragmentation in the present reaction and the antiquark fragmentation measured in e+e- [e superscript + e superscript -] collisions. We have observed that the two ϕ-dependent [phi-dependent] terms of the cross section are small. Within our precision the cos2ϕ [cos 2 phi] term is compatible with zero, except for the low-z region, and the measured cosϕ [cos phi]term is much smaller in magnitude than the sum of the Cahn and Berger effects. United States. Dept. of Energy United States. Dept. of Energy (Contract No. DE-AC05- 84ER40150) National Science Foundation (U.S.) 2011-08-05T18:48:50Z 2011-08-05T18:48:50Z 2009-08 2008-09 Article http://purl.org/eprint/type/JournalArticle 1550-7998 1550-2368 http://hdl.handle.net/1721.1/65096 Osipenko, M. et al. “Measurement of Semi-inclusive Π+ Electroproduction Off the Proton.” Physical Review D 80.3 (2009) : n. pag. © 2009 The American Physical Society en_US http://dx.doi.org/10.1103/PhysRevD.80.032004 Physical review D Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Skabelin, Alexander V. Measurement of semi-inclusive pi(+) electroproduction off the proton |
| title | Measurement of semi-inclusive pi(+) electroproduction off the proton |
| title_full | Measurement of semi-inclusive pi(+) electroproduction off the proton |
| title_fullStr | Measurement of semi-inclusive pi(+) electroproduction off the proton |
| title_full_unstemmed | Measurement of semi-inclusive pi(+) electroproduction off the proton |
| title_short | Measurement of semi-inclusive pi(+) electroproduction off the proton |
| title_sort | measurement of semi inclusive pi electroproduction off the proton |
| url | http://hdl.handle.net/1721.1/65096 |
| work_keys_str_mv | AT skabelinalexanderv measurementofsemiinclusivepielectroproductionofftheproton |