F. Penunuri

Publications (4)0 Total impact

• Source

  Available from: F. Larios

  Article: QCD correction to single top quark production at the ILC

  F. Penunuri, F. Larios, Antonio O. Bouzas
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  ABSTRACT: Single top quark production at the ILC can be used to obtain a high precision measurements of the the Vtb CKM matrix element as well as the effective tbW coupling. We have calculated the QCD correction for the cross section in the context of an effective vector boson approximation. Our results show a 10% increase due to the strong interaction.
  02/2011;
• Source

  Available from: F. Larios

  Article: The tbW vertex in the Littlest Higgs Model with T-parity

  F. Penunuri, F. Larios
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  ABSTRACT: A study of the effective tbW vertex is done in the littlest Higgs model with T parity that includes the one loop induced weak dipole coefficient f_{2R}. The top's width, the W-boson helicity in the t-> bW^+ decay as well as the t-channel and the s-channel modes of single top quark production at the LHC are then obtained for the tbW coupling. Our calculation is done in the Feynman-'t Hooft gauge, and we provide details of the analysis, like exact formulas (to all orders of the expansion variable v/f) of masses and mixing angles of all the particles involved. Also, a complete and exact diagonalization (and normalization) of the scalar sector of the model is made.
  11/2008;
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  Available from: F. Larios

  Article: Top-pions and single top production at HERA and THERA

  F. Larios, F. Penunuri, M. A. Perez
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  ABSTRACT: We study single top quark production at the HERA and THERA colliders as coming from the FCNC vertices tcgamma and tcZ that appear at one loop level in Topcolor-assisted technicolor models (TC2). In contrast with previous expectations, we find that the production cross section is of order 10^-6 pb for HERA and 10^-4 pb for THERA (even lower that the SM prediction). Therefore, none of the two colliders are capable to probe the pseudoscalar top-pion or the scalar top-higgs predicted in TC2 models via single top production. Comment: 5 pages, 2 figures. Paragraph and 1 reference added
  09/2004;
• Source

  Available from: F. Larios

  Article: FCNC production of same sign Top quark pairs at the LHC

  F. Larios, F. Penunuri
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  ABSTRACT: We study the possibility of same sign top quark pair production at the LHC (and the VLHC) as a direct probe of FCNC processes. Besides the SM neutral Z boson, two other neutral bosons are considered, a top-Higgs type scalar and a Z' boson that appear in Topcolor assisted Technicolor models. We find that the FCNC couplings tqV (q=u,c ; V=H,Z,Z') may produce an interesting signal of same sign top quark pairs that could be observed at the LHC (VLHC).
  12/2003;