- Access by Xinjiang University
Gluon transverse momenta and charm quark-antiquark pair production in collisions at the Fermilab Tevatron
Phys. Rev. D 73, 054028 – Published 30 March, 2006
DOI: https://doi.org/10.1103/PhysRevD.73.054028
Abstract
We discuss and compare different approaches to include gluon transverse momenta for heavy quark-antiquark pair production. The correlations in azimuthal angle and in the heavy quark, heavy antiquark transverse momenta are studied in detail. The results are illustrated with the help of different unintegrated gluon distribution functions (UGDF) from the literature. We compare results obtained with on-shell and off-shell matrix elements and kinematics and quantify where these effects are negligible and where they are essential. We concentrate on the region of asymmetric transverse momenta of charm quark and charm antiquark. Most of UGDFs lead in this corner of the phase space to almost full decorrelation in the azimuthal angle. We propose correlation observables to be best suited in order to test the existing models of UGDFs.
Article Text
References (27)
- M. Łuszczak and A. Szczurek, Phys. Lett. B 594, 291 (2004).
- J. F. Owens, Rev. Mod. Phys. 59, 465 (1987); Ch-Y. Wong and H. Wang, Phys. Rev. C 58, 376 (1998); Y. Zhang, G. Fai, G. Papp, G. G. Barnaföldi, and P. Lévai, 65, 034903 (2002).
- U. d’Alesio and F. Murgia, Phys. Rev. D 70, 074009 (2004).
- S. Catani, M. Ciafaloni, F. Hautmannand , Nucl. Phys. B366, 135 (1991).
- J. C. Collins and R. K. Ellis, Nucl. Phys. B360, 3 (1991).
- R. D. Ball and R. K. Ellis, J. High Energy Phys. 05 (2001) 053.
- E. M. Levin, M. G. Ryskin, Yu. M. Shabelski, and A. G. Shuvaev, Sov. J. Nucl. Phys. 53, 657 (1991); M. G. Ryskin, Yu. M. Shabelski, and A. G. Shuvaev, Z. Phys. C 69, 269 (1996); Yu. M. Shabelski and A. G. Shuvaev, Eur. Phys. J. C 6, 313 (1999); M. G. Ryskin, A. G. Shuvaev, and Yu. M. Shabelski, Phys. At. Nucl. 64, 1995 (2001); Yu. M. Shabelski and A. G. Shuvaev, hep-ph/0107106; hep-ph/0406157.
- S. P. Baranov and M. Smizanska, Phys. Rev. D 62, 014012 (2000).
- Ph. Hagler, R. Kirschner, A. Schäfer, L. Szymanowski, and O. V. Teryaev, Phys. Rev. D 62, 071502 (2000).
- A. V. Lipatov, V. A. Saleev, and N. P. Zotov, hep-ph/0112114; S. P. Baranov, A. V. Lipatov, and N. P. Zotov, Yad. Fiz. 67, 856 (2004).
- V. D. Barger and R. J. N. Phillips, Collider Physics (Addison-Wesley, Reading, MA, 1987).
In this paper we shall use parallel two different conventions of unintegrated gluon distributions: (a) , (b) .
When both UGDFs are generated perturbatively.
- M. A. Kimber, A. D. Martin, and M. G. Ryskin, Eur. Phys. J. C 12, 655 (2000); Phys. Rev. D 63, 114027 (2001).
- J. Kwieciński, Acta Phys. Pol. B 33, 1809 (2002).
- A. Gawron and J. Kwieciński, Acta Phys. Pol. B 34, 133 (2003).
- A. Gawron, J. Kwieciński, and W. Broniowski, Phys. Rev. D 68, 054001 (2003).
- M. Czech and A. Szczurek, Phys. Rev. C 72, 015202 (2005); nucl-th/050910007.
- M. Glück, E. Reya and A. Vogt, Eur. Phys. J. C 5, 461 (1998).
- J. Kwieciński, A. D. Martin, and A. Staśto, Phys. Rev. D 56, 3991 (1997).
- M. Glück, E. Reya and A. Vogt, Z. Phys. C 67, 433 (1995).
- A. Szczurek, Acta Phys. Pol. B 34, 3191 (2003).
- E. A. Kuraev, L. N. Lipatov, and V. S. Fadin, Sov. Phys. JETP 45, 199 (1977); Ya. Ya. Balitskij and L. N. Lipatov, Sov. J. Nucl. Phys. 28, 822 (1978).
- A. J. Askew, J. Kwieciński, A. D. Martin, and P. J. Sutton, Phys. Rev. D 49, 4402 (1994).
- K. J. Eskola, A. V. Leonidov, and P. V. Ruuskanen, Nucl. Phys. B481, 704 (1996).
- K. Golec-Biernat and M. Wüsthoff, Phys. Rev. D 60, 114023 (1999).
- D. Kharzeev and E. Levin, Phys. Lett. B 523, 79 (2001).