Top quarks as a window to string resonances

Dong, Zhe; Han, Tao; Huang, Min–xin; Shiu, Gary

doi:10.1007/jhep09(2010)048

Cited by 30 publications

(33 citation statements)

References 77 publications

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“…[24][25][26][27][28][29][30]), or purely stringy signatures (see, e.g. [31][32][33][34][35][36][37][38][39][40][41][42][43][44]). 3 Such a scenario is displayed in figure 1, where the Standard Model sector is localized on a small region of the full Calabi-Yau manifold.…”

Section: Jhep12(2014)059mentioning

confidence: 99%

Production of light stringy states

Anastasopoulos¹,

Richter

2014

J. High Energ. Phys.

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Abstract:We discuss the direct production of light stringy states. Those states correspond to the lightest stringy excitations localized at the intersection of two D-brane stacks and their mass can be parametrically smaller than the string scale. Thus in a low string scale scenario one may observe stringy signatures at LHC even in the absence of the usual string resonances. We compute the tree level string scattering amplitude involving two gauge bosons and two such light stringy states. We give the squared amplitude summed over all polarization and gauge configuration and eventually apply the result to the quark sector of a D-brane realization of the Standard Model.

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Section: Jhep12(2014)059mentioning

confidence: 99%

Production of light stringy states

Anastasopoulos¹,

Richter

2014

J. High Energ. Phys.

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“…They could also be string excitations in a low scale string scenarios [23][24][25][26][27]. The color-sextet fermions arise in theories of chiral color [11] and top quark condensate models [12], the so-called "quixes".…”

Section: ⊗mentioning

confidence: 99%

“…(3.7) with an additional suppression from the loop factor. Color-octet vector states have also been studied in the context of low-scale string resonances [24][25][26][27] via gluon-gluon annihilation, but it typically leads to a suppressed rate.…”

Section: Jhep12(2010)085mentioning

confidence: 99%

Colored resonant signals at the LHC: largest rate and simplest topology

Han

Lewis

Liu

2010

J. High Energ. Phys.

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149

119

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Abstract:We study the colored resonance production at the LHC in a most general approach. We classify the possible colored resonances based on group theory decomposition, and construct their effective interactions with light partons. The production cross section from annihilation of valence quarks or gluons may be on the order of 400 − 1000 pb at LHC energies for a mass of 1 TeV with nominal couplings, leading to the largest production rates for new physics at the TeV scale, and simplest event topology with dijet final states. We apply the new dijet data from the LHC experiments to put bounds on various possible colored resonant states. The current bounds range from 0.9 to 2.7 TeV. The formulation is readily applicable for future searches including other decay modes.

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“…[1][2][3][4]. At first, one would see Regge excitations indirectly, in the excess of photons [5,6], jets [7,8], heavy quarks [9] and leptons due to the resonant enhancement of their production rates. As emphasized in Refs.…”

Section: Introductionmentioning

confidence: 99%

Direct production of lightest Regge resonances

et al. 2011

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We discuss direct production of Regge excitations in the collisions of massless four-dimensional superstring states, focusing on the first excited level of open strings ending on D-branes extending into higher dimensions. We construct covariant vertex operators and identify "universal" Regge states with the internal parts either trivial or determined by the world-sheet SCFT describing superstrings propagating on an arbitrary Calabi-Yau manifold. We evaluate the amplitudes involving one such massive state and up to three massless ones and express them in the helicity basis. The most important phenomenological applications of our results are in the context of low-mass string (and large extra dimensions) scenarios in which excited string states are expected to be produced at the LHC as soon as the string mass threshold is reached in the center-of-mass energies of the colliding partons. In order to facilitate the use of partonic cross sections, we evaluate them and tabulate for all production processes: gluon fusion, quark absorbing a gluon, quark-antiquark annihilation and quark-quark scattering.

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Top quarks as a window to string resonances

Cited by 30 publications

References 77 publications

Production of light stringy states

Production of light stringy states

Colored resonant signals at the LHC: largest rate and simplest topology

Direct production of lightest Regge resonances

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