• [1]

    N. Brambilla et al, Eur. Phys. J. C, 71:1534(2011)

  • [2]

    G. T. Bodwin, E. Braaten, and G. P. Lepage, Phys. Rev. D, 51:1125(1995)

  • [3]

    R. Aaij et al (LHCb Collaboration), Eur. Phys. J. C, 75:311(2015)

  • [4]

    M. Butenschoen, Z. G. He, and B. A. Kniehl, Phys. Rev. Lett. 114:092004(2015)

  • [5]

    H. Han, Y. Q. Ma, C. Meng, H. S. Shao, and K. T. Chao, Phys. Rev. Lett., 114:092005(2015)

  • [6]

    H. F. Zhang, Z. Sun, W. L. Sang, and R. Li, Phys. Rev. Lett. 114:092006(2015)

  • [7]

    J. C. Collins, D. E. Soper, and G. F. Sterman, Adv. Ser. Direct. High Energy Phys. 5:1(1989)[hep-ph/0409313]

  • [8]

    K. A. Olive et al (Particle Data Group Collaboration), Chin. Phys. C, 38:090001(2014)

  • [9]

    Z. B. Kang, J. W. Qiu, and G. Sterman, Phys. Rev. Lett., 108:102002(2012)[arXiv:1109.1520[hep-ph]]

  • [10]

    Z. B. Kang, Y. Q. Ma, J. W. Qiu, and G. Sterman, Phys. Rev. D, 90:034006(2014)

  • [11]

    Y. Q. Ma, J. W. Qiu, and H. Zhang, Phys. Rev. D, 89:094029(2014)

  • [12]

    Y. Q. Ma, J. W. Qiu, and H. Zhang, Phys. Rev. D, 89:094030(2014); doi:10.1103/PhysRevD.89.094030[arXiv:1401. 0524[hep-ph]]

  • [13]

    C. H. Chang, Nucl. Phys. B, 172:425(1980)

  • [14]

    E. Braaten and T. C. Yuan, Phys. Rev. Lett., 71:1673(1993)[hep-ph/9303205]

  • [15]

    J. P. Ma, Phys. Lett. B, 332:398(1994)

  • [16]

    G. T. Bodwin and J. Lee, Phys. Rev. D, 69:054003(2004)

  • [17]

    G. T. Bodwin, U. R. Kim, and J. Lee, JHEP, 1211:020(2012); doi:10.1007/JHEP11(2012)020[arXiv:1208.5301[hep-ph]]

  • [18]

    W. L. Sang, L. F. Yang, and Y. Q. Chen, Phys. Rev. D, 80:014013(2009)

  • [19]

    P. Artoisenet and E. Braaten, JHEP, 1504:121(2015)

  • [20]

    J. C. Collins and D. E. Soper, Nucl. Phys. B, 194:445(1982)

  • [21]

    E. Braaten, K. M. Cheung, and T. C. Yuan, Phys. Rev. D, 48:4230(1993)

  • [22]

    M. Gremm and A. Kapustin, Phys. Lett. B, 407:323(1997)

  • [23]

    G. T. Bodwin and A. Petrelli, Phys. Rev. D, 66:094011(2002)

  • [24]

    G. P. Salam and J. Rojo, Comput. Phys. Commun., 180:120(2009)