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Title: Production of hht and htT in the littlest Higgs model with T parity

Abstract

In the littlest Higgs model with T parity, which predicts a pair of T-even and T-odd partners for the top quark, the top-quark interactions are altered with respect to the standard model predictions and the deviation will manifest in various top-quark processes. In this work we examine the effects in htt productions at the International Linear Collider and CERN LHC. We find that, in the allowed parameter space, the cross sections can be significantly deviated from the standard model predictions and thus provide a good test for the littlest Higgs model with T parity. We also examine the new production channel, htT or hTt production, at the LHC, which gives the same final states as htt production due to the dominant decay T{yields}Wb. We find that, compared with htt production, this new production channel can have a sizable production rate for a T quark below the TeV scale. Such a production will be counted into htt events or possibly extracted from htt events, depending on if we can distinguish the T quark from the top quark from mass reconstructions.

Authors:
;  [1];  [2];  [3];  [1];  [3]
  1. Institute of Theoretical Physics, Academia Sinica, Beijing 100080 (China)
  2. CCAST (World Laboratory), P.O. Box 8730, Beijing 100080 (China)
  3. (China)
Publication Date:
OSTI Identifier:
21020266
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.75.074006; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CERN LHC; CROSS SECTIONS; HIGGS MODEL; LINEAR COLLIDERS; PARITY; PARTICLE DECAY; PARTICLE PRODUCTION; REST MASS; STANDARD MODEL; T QUARKS; TEV RANGE

Citation Formats

Wang Lei, Wang Wenyu, Yang Jinmin, Institute of Theoretical Physics, Academia Sinica, Beijing 100080, Zhang Huanjun, and Department of Physics, Henan Normal University, Xinxiang 453007. Production of hht and htT in the littlest Higgs model with T parity. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.074006.
Wang Lei, Wang Wenyu, Yang Jinmin, Institute of Theoretical Physics, Academia Sinica, Beijing 100080, Zhang Huanjun, & Department of Physics, Henan Normal University, Xinxiang 453007. Production of hht and htT in the littlest Higgs model with T parity. United States. doi:10.1103/PHYSREVD.75.074006.
Wang Lei, Wang Wenyu, Yang Jinmin, Institute of Theoretical Physics, Academia Sinica, Beijing 100080, Zhang Huanjun, and Department of Physics, Henan Normal University, Xinxiang 453007. Sun . "Production of hht and htT in the littlest Higgs model with T parity". United States. doi:10.1103/PHYSREVD.75.074006.
@article{osti_21020266,
title = {Production of hht and htT in the littlest Higgs model with T parity},
author = {Wang Lei and Wang Wenyu and Yang Jinmin and Institute of Theoretical Physics, Academia Sinica, Beijing 100080 and Zhang Huanjun and Department of Physics, Henan Normal University, Xinxiang 453007},
abstractNote = {In the littlest Higgs model with T parity, which predicts a pair of T-even and T-odd partners for the top quark, the top-quark interactions are altered with respect to the standard model predictions and the deviation will manifest in various top-quark processes. In this work we examine the effects in htt productions at the International Linear Collider and CERN LHC. We find that, in the allowed parameter space, the cross sections can be significantly deviated from the standard model predictions and thus provide a good test for the littlest Higgs model with T parity. We also examine the new production channel, htT or hTt production, at the LHC, which gives the same final states as htt production due to the dominant decay T{yields}Wb. We find that, compared with htt production, this new production channel can have a sizable production rate for a T quark below the TeV scale. Such a production will be counted into htt events or possibly extracted from htt events, depending on if we can distinguish the T quark from the top quark from mass reconstructions.},
doi = {10.1103/PHYSREVD.75.074006},
journal = {Physical Review. D, Particles Fields},
number = 7,
volume = 75,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2007},
month = {Sun Apr 01 00:00:00 EDT 2007}
}
  • One of the important features of the littlest Higgs model with T parity, called the LHT model, is that it introduces the mirror fermions, which are the T-parity partners of the standard model fermions. In this paper, we discuss production of the mirror quark associated with a mirror neutrino via e{gamma} and ep collisions. We find that, in a wide range of the parameter space, the mirror quark can be copiously produced at the International Linear e{sup +}e{sup -} Collider and ep collider (THERA) experiments. The production rates of certain signal events, which are related the main two-body decay modesmore » of the mirror quark, are also calculated.« less
  • We have calculated the cross section of the process e{sup +}e{sup -}{yields}{gamma}{gamma}{yields}bb in the littlest Higgs model with T parity (LHT). We find that, for the favorable parameters, the total cross section {sigma}(e{sup +}e{sup -}{yields}{gamma}{gamma}{yields}bb) is sensitive to the breaking scale f, mixing parameter x{sub L}, the masses of the mirror quarks m{sub Hi}, and the relative correction of the LHT model is a few percent to dozens of percent. The cross section is significantly larger than the corresponding results in the standard model and in the other typical new physics models. Therefore the prediction in the LHT model ismore » quite different from the predictions in other new physics models and such a process is really interesting in searching for the signs of the LHT model.« less
  • We consider the top-quark pair production at the upcoming LHC and investigate the contributions of the new particles to the related observables within the framework of the littlest Higgs model with T-parity(LHT). It is found that the LHT model can generate significant corrections to the tt production cross section and their spin correlations.
  • In the framework of the littlest Higgs model with T parity, we studied the contributions of the new particles to the top-quark pair production via e{sup +}e{sup -} collision at the International Linear Collider. We calculated the top-quark pair production cross section and found this process can generate significantly relative correction. The result may be a sensitive probe of the littlest Higgs model with T parity.
  • We study the Higgs boson decays and production via gluon fusion at the LHC as a probe of two typical littlest Higgs models which introduce a top quark partner with different (even and odd) T parity to cancel the Higgs mass quadratic divergence contributed by the top quark. For each model, we consider two different choices for the down-type quark Yukawa couplings. We first examine the branching ratios of the Higgs boson decays and then study the production via gluon fusion followed by the decay into two photons or two weak gauge bosons. We find that the predictions can bemore » quite different for different models or different choices of down-type quark Yukawa couplings, and all these predictions can sizably deviate from the standard model predictions. So the Higgs boson processes at the LHC can be a sensitive probe for these littlest Higgs models.« less