2,112 research outputs found
Alternative signature of TeV strings: Reduction in QCD jet production
No full textKin-ya Oda and Nobuchika Okada. Alternative signature of TeV strings: Reduction in QCD jet production. Phys. Rev. D 66, 095005, 2002. https://doi.org/10.1103/PhysRevD.66.095005.In string theory, it is well known that any hard scattering amplitude inevitably suffers exponential suppression. We demonstrate that, if the string scale is (Formula presented) this intrinsically stringy behavior leads to a dramatic reduction in the QCD jet production rate with very high transverse momenta (Formula presented) at CERN LHC. This suppression is sufficient to be observed in the first year of low-luminosity running. Our prediction is based on the universal behavior of string theory, and therefore is qualitatively model independent. This signature is alternative and complementary to conventional ones such as Regge resonance (or string ball or black hole) production
Universal extra dimensions on real projective plane
No full textHideto Dohi, Kin-ya Oda. Universal Extra Dimensions on Real Projective Plane. https://arxiv.org/abs/1004.3722.This is a pre-print of an article published in Physics Letters, Section B. The final authenticated version is available online at: https://doi.org/10.1016/j.physletb.2010.07.020.We propose a six dimensional Universal Extra Dimensions (UED) model compactified on a real projective plane RP2, a two-sphere with its antipodal points being identified. We utilize the Randjbar-Daemi-Salam-Strathdee spontaneous sphere compactification with a monopole configuration of an extra U(1)X gauge field that leads to a spontaneous radius stabilization. Unlike the sphere and the so-called S2/Z2 compactifications, the massless U(1)X gauge boson is safely projected out. We show how a compactification on a non-orientable manifold results in a chiral four dimensional gauge theory by utilizing 6D chiral gauge and Yukawa interactions. The resultant Kaluza-Klein mass spectra are distinct from the ordinary UED models compactified on torus. We briefly comment on the anomaly cancellation and also on a possible dark matter candidate in our model
A holographic dual of bjorken flow
No full textShunichiro Kinoshita, Shinji Mukohyama, Shin Nakamura, Kin-ya Oda. A Holographic Dual of Bjorken Flow. https://arxiv.org/abs/0807.3797.This is a pre-print of an article published in Progress of Theoretical Physics. The final authenticated version is available online at: https://doi.org/10.1143/PTP.121.121.We propose a consistent setup for a holographic dual of Bjorken flow of strongly coupled large-Nc N = 4 SYM-theory plasma. We employ Eddington-Finkelstein type coordinates for the dual geometry, and we propose a late-time expansion there. We construct the dual geometry order by order, and we show that the transport coefficients are determined by the regularity of the geometry. We also show that the dual geometry has an apparent horizon hence an event horizon, which covers the singularity at the origin. We prove that the dual geometry is regular at all orders under an appropriate choice of the transport coefficients. Our model is a concrete well-defined example of time-dependent AdS/CFT
Black hole/string ball production, possibly at LHC
No full textKin-ya Oda. Black hole/string ball production, possibly at LHC. https://arxiv.org/abs/1004.0559.I show a brief historical overview of recent developments on the black hole physics that can be possibly explored at LHC. I comment on the correspondence principle of black holes and strings and show its realization in a differential production cross section of a black hole/string ball with fixed angular momentum
Bare Higgs mass and potential at ultraviolet cutoff
No full textYuta Hamada, Hikaru Kawai, Kin-ya Oda. Bare Higgs mass and potential at ultraviolet cutoff. https://arxiv.org/abs/1305.7055.We first review the current status of the top mass determination paying attention to the difference between the MS-bar and pole masses. Then we present our recent result on the bare Higgs mass at a very high ultraviolet cutoff scale
Rotating black holes/rings at future colliders
No full textDaisuke Ida, Kin-ya Oda, Seong Chan Park. Rotating Black Holes/Rings at Future Colliders. https://arxiv.org/abs/hep-ph/0312061.The hierarchy between the electroweak and Planck scales can be reduced when the extra dimensions are compactified with large volume or with warped geometry, resulting in the fundamental scale of the order of TeV. In such a scenario, one can experimentally study the physics above the Planck scale. We discuss black hole/ring production at future colliders
Black holes at future colliders
No full textDaisuke Ida, Kin-ya Oda, Seong Chan Park. Black Holes at future colliders. https://arxiv.org/abs/hep-ph/0311297.We consider the production and decay of TeV sized black holes. After discussing evaluation of the production cross section of higher dimensional rotating black holes and black rings, the master equation for general spin-s fields confined on brane world is derived. For five-dimensional (Randall-Sundrum) black holes, we obtain analytic formulae for the greybody factors in low frequency expansion
Rotating black holes at future colliders
No full textDaisuke Ida, Kin-ya Oda, Seong Chan Park. Rotating Black Holes at Future Colliders. https://arxiv.org/abs/hep-ph/0312385.We consider the production and decay of TeV-scale black holes. Evaluation of the production cross section of higher dimensional rotating black holes is made. The master field equation for general spin-s fields confined on brane world is derived. For five-dimensional (Randall-Sundrum) black holes, we obtain analytic formulae for the greybody factors in low frequency expansion
Geometric cross sections of rotating strings and black holes
No full textToshihiro Matsuo and Kin-ya Oda. Geometric cross sections of rotating strings and black holes. Phys. Rev. D 79, 026003, 2009. https://doi.org/10.1103/PhysRevD.79.026003.We study the production cross section of a highly excited string with fixed angular momentum from an ultrahigh energy collision of two light strings. We find that the cross section exhibits geometric behavior in a certain region of angular-momentum/impact-parameter space. This geometric behavior is common to the differential cross sections of a black hole production with fixed angular momentum and thus we see another correspondence between strings and black holes
Bare Higgs mass at Planck scale
No full textYuta Hamada, Hikaru Kawai, and Kin-ya Oda. Bare Higgs mass at Planck scale. Phys. Rev. D 87, 053009, 2013. https://doi.org/10.1103/PhysRevD.87.053009.Yuta Hamada, Hikaru Kawai, and Kin-ya Oda. Erratum: Bare Higgs mass at Planck scale [Phys. Rev. D 87, 053009 (2013)]. Phys. Rev. D 89, 059901, 2014. https://doi.org/10.1103/PhysRevD.89.059901.We compute one- and two-loop quadratic divergent contributions to the bare Higgs mass in terms of the bare couplings in the Standard Model. We approximate the bare couplings, defined at the ultraviolet cutoff scale, by the MS-bar ones at the same scale, which are evaluated by the two-loop renormalization group equations for the Higgs mass around 126GeV in the Standard Model. We obtain the cutoff scale dependence of the bare Higgs mass, and examine where it becomes zero. We find that when we take the current central value for the top quark pole mass, 173GeV, the bare Higgs mass vanishes if the cutoff is about 10^{23}GeV. With a 1.3 sigma smaller mass, 170GeV, the scale can be of the order of the Planck scale
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