| THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS |
|
|
|
|
Top Quark Decay t → cbb- in Topcolor-Assisted Technicolor Models |
| LIU Guo-Li |
| Department of Physics, Zhengzhou University, Zhengzhou 450001Kavli Institute for Theoretical Physics China, Chinese Academy of Sciences, Beijing 100190 |
|
| Cite this article: |
|
LIU Guo-Li 2009 Chin. Phys. Lett. 26 101401 |
|
|
|
|
Abstract The topcolor-assisted technicolor (TC2) model predicts the existence of the top-pions and the CP-even top-Higgs with large flavor-changing couplings to the top quark, which at tree-level can mediate the top quark three-body decay t → cbb-. We study this decay, show the dependence of the decay rate on the relevant TC2 parameters and compare the results with the predictions in the minimal supersymmetric model. We find that the decay rate in the TC2 model is much larger than that in the minimal supersymmetric model if the new particles are not too heavy. However, in consideration of the CDF and the LEP experiment limits, the top-pion mass is greater than 340GeV in a more realistic parameter space, so the decay width of the channel t → cbb- intermediated by top-pions will be depressed greatly and difficult to be detected at the future collider. Thus, to observe this channel at the future collider, considering the top-higgs contribution may be the possible way when the masses of the top-pions and the top-higgs are not degenerate.
|
| Keywords:
14.65.Ha
12.60.Fr
12.60.Jv
|
|
|
Received: 20 March 2009
Published: 27 September 2009
|
|
|
|
|
|
|
|
[1] Bernreuther W 2008 J. Phys. G 35 083001 Chakraborty D, Konigsberg J and Rainwater D 2003 Ann. Rev.Nucl. Part. Sci. 53 301 Simmons E H hep-ph/0211335 Yuan C P hep-ph/0203088 Willenbrock S hep-ph/0211067 Beneke M et al hep-ph/0003033 Han T arXiv:0804.3178
[2] Hill C T and Parke S J 1994 Phys. Rev. D 494454 Whisnant K et al 1997 Phys. Rev. D 56 467 Yang J M and Young B L 1997 Phys. Rev. D 56 5907 Hikasa K et al 1998 Phys. Rev. D 58 114003 Aguilar-Saavedra J A arXiv:0811.3842 Gu Q, Yang H and Wang X 2007 Chin. Phys. Lett. 24 1513
[3] Eilam G et al 1991 Phys. Rev. D 44 1473 Mele B et al 1998 Phys. Lett. B 435 401 Cordero-Cid A et al 2006 Phys. Rev. D 73 094005 Eilam G et al 2006 Phys. Rev. D 73 053011 Li C S et al 1994 Phys. Rev. D 49 293 Couture G et al 1995 Phys. Rev. D 52 1713 Lopez J L et al 1997 Phys. Rev. D 56 3100 de Divitiis G M et al 1997 Nucl. Phys. B 504 45 Yang J M, Young B L and Zhang X 1998 Phys. Rev. D 58 055001 Li C S, Yang L L and Jin L G 2004 Phys. Lett. B 599 92 Frank M and Turan I 2006 Phys. Rev. D 74 073014 Yang J M and Li C S 1994 Phys. Rev. D 49 3412 Guasch J and Sola J 1999 Nucl. Phys. B 562 3 Eilam G et al 2001 Phys. Lett. B 510 227 Guasch J et al hep-ph/0601218 Yang J M 2005 Ann. Phys. 316 529 Yang J M 2008 Int. J. Mod. Phys. A 23 3343 Cao J et al 2003 Nucl. Phys. B 651 87 Cao J et al 2006 Phys. Rev. D 74 031701 Cao J et al 2007 Phys. Rev. D 75 075021 Cao J et al 2009 Phys. Rev. D 79 054003
[5] Aaltonen T et al 2008 Phys. Rev. D 78 111101
[6] Zhang L, Wang X, Kuang Y and Zhou H 2000 Phys. Rev.D 61 115007
[7] He H J and Yuan C P 1999 Phys. Rev. Lett. 8328 Burdman G 1999 Phys. Rev. Lett. 83 2888 Wang X et al 1994 Phys. Rev. D 50 5781 Yue C et al 2000 Phys. Lett. B 496 93 Yue C et al 2001 Phys. Lett. B 508 290 Cao J et al 2003 Phys. Rev. D 67 071701 Cao J et al 2004 Phys. Rev. D 70 114035 Cao J et al 2005 Eur. Phys. J. C 41 381 Cao J et al 2007 Phys. Rev. D 76 014004 Zhang H J 2008 Phys. Rev. D 77 057501 Liu G L and Zhang H J 2008 Chin. Phys. C 32 597
[8] Hill C T 1995 Phys. Lett. B 345 483 Lane K and Eichten E 1995 Phys. Lett. B 352 382 Lane K and Eichten E 1998 Phys. Lett. B 433 96 Bardeen W A, Hill C T and Lindner M 1990 Phys. Rev. D 41 1647 Cvetic G 1999 Rev. Mod. Phys. 71 513 Bardeen W A, Hill C T and Lindner M 1990 Phys. Rev. D 41 1647
[9] Cvetic G 1999 Rev. Mod. Phys. 71 513
[10] Eguchi T 1976 Phys. Rev. D 14 2755
[11] Leibovich A K and Rainwater D 2002 Phys. Rev. D 65 055012
[12] Burdman G and Kominis D 1997 Phys. Lett. B 403 107 Loinaz W and Takuch T 1999 Phys. Rev. D 60 015005 Yue C, Kuang Y, Wang X and Li W 2000 Phys. Rev. D 62 055005
[13] Aaltonen T et al (CDF collaboration) arXiv:0901.3773 Abazov V et al (D0 collaboration) arXiv:0901.2137.
[14] Anastasiou C, Furlan E and Santiago J 2009 Phys.Rev. D 79 075003 Chivukula R S and Simmons E H 2002 Phys. Rev. D 66 015006
[15] Chivukula R S, He H J, Howard J and Simmons E H 2004 Phys. Rev. D 69 015009
[16] Aguilar-Saavedra J A and Branco G C 2000 Phys.Lett. B 495 347
[17] Guasch J and Sola J 1999 Nucl. Phys. B 562 3 |
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
