TY - JOUR
T1 - Top Yukawa deviation in extra dimension
AU - Haba, Naoyuki
AU - Oda, Kin ya
AU - Takahashi, Ryo
N1 - Funding Information:
N.H. and K.O. have been supported in part by scientific grants from the Ministry of Education, Science, Sports, and Culture of Japan Nos. 18204024, 20244028, 20025004, 20039006, and 205402272. The work of R.T. has been partially supported by the Japan Society of Promotion of Science. The authors are grateful to Toshifumi Yamashita and Shigeki Matsumoto for helpful and fruitful discussions, and also thank Kazunori Hanagaki, Yutaka Hosotani, Nobuchika Okada, Yutaka Sakamura, Minoru Tanaka, and Nobuhiro Uekusa for useful comments.
PY - 2009/11/1
Y1 - 2009/11/1
N2 - We suggest a simple one-Higgs-doublet model living in the bulk of five-dimensional spacetime compactified on S1 / Z2, in which the top Yukawa coupling can be smaller than the naive standard-model expectation, i.e. the top quark mass divided by the Higgs vacuum expectation value. If we find only single Higgs particle at the LHC and also observe the top Yukawa deviation, our scenario becomes a realistic candidate beyond the standard model. The Yukawa deviation comes from the fact that the wave function profile of the free physical Higgs field can become different from that of the vacuum expectation value, due to the presence of the brane-localized Higgs potentials. In the Brane-Localized Fermion scenario, we find sizable top Yukawa deviation, which could be checked at the LHC experiment, with a dominant Higgs production channel being the WW fusion. We also study the Bulk Fermion scenario with brane-localized Higgs potential, which resembles the Universal Extra Dimension model with a stable dark matter candidate. We show that both scenarios are consistent with the current electroweak precision measurements.
AB - We suggest a simple one-Higgs-doublet model living in the bulk of five-dimensional spacetime compactified on S1 / Z2, in which the top Yukawa coupling can be smaller than the naive standard-model expectation, i.e. the top quark mass divided by the Higgs vacuum expectation value. If we find only single Higgs particle at the LHC and also observe the top Yukawa deviation, our scenario becomes a realistic candidate beyond the standard model. The Yukawa deviation comes from the fact that the wave function profile of the free physical Higgs field can become different from that of the vacuum expectation value, due to the presence of the brane-localized Higgs potentials. In the Brane-Localized Fermion scenario, we find sizable top Yukawa deviation, which could be checked at the LHC experiment, with a dominant Higgs production channel being the WW fusion. We also study the Bulk Fermion scenario with brane-localized Higgs potential, which resembles the Universal Extra Dimension model with a stable dark matter candidate. We show that both scenarios are consistent with the current electroweak precision measurements.
UR - http://www.scopus.com/inward/record.url?scp=67849118595&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=67849118595&partnerID=8YFLogxK
U2 - 10.1016/j.nuclphysb.2009.06.024
DO - 10.1016/j.nuclphysb.2009.06.024
M3 - Article
AN - SCOPUS:67849118595
SN - 0550-3213
VL - 821
SP - 74
EP - 128
JO - Nuclear Physics B
JF - Nuclear Physics B
IS - 1-2
ER -