High Energy Accelerator Research Organization

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions

Showing 2017 · hep-phShow all

40 papers · 2 filters

hep-ph2017★ 20 cited

Probing the CP properties of top Yukawa coupling at an $e^{+} e^{-}$ collider

Kaoru Hagiwara, Hiroshi Yokoya, Ya-Juan Zheng

We study consequences of CP violation in the $h t t ˉ$ Yukawa coupling through the process $e^{+} e^{-} \to$ $h (125) t t ˉ$ . The helicity amplitudes are calculated in the $t t ˉ$ …

hep-ph2017★ 68 cited

Gluino-mediated electroweak penguin with flavor-violating trilinear couplings

Motoi Endo, Toru Goto, Teppei Kitahara +3

In light of a discrepancy of the direct $C P$ violation in $K \to π π$ decays, $ε^{'} / ε_{K}$ , we investigate gluino contributions to the electroweak penguin, where flavo…

hep-ph2017

GR@PPA 2.9: radiation matching for simulating photon production processes in hadron collisions

Shigeru Odaka, Yoshimasa Kurihara

We release an event generator package, GR@PPA 2.9, for simulating the direct (single) photon and diphoton (double photon) production in hadron collisions. The included programs wer…

hep-ph2017★ 13 cited

Improved analysis for $μ^{-} e^{-} \to e^{-} e^{-}$ in muonic atoms by photonic interaction

Yuichi Uesaka, Yoshitaka Kuno, Joe Sato +2

Studies of the charged lepton flavor violating process of $μ^{-} e^{-} \to e^{-} e^{-}$ in muonic atoms by the four Fermi interaction [Y. Uesaka \textit{et al}., Phys. Rev. D {\bf 93}, 076006…

hep-ph2017★ 134 cited

Hadron tomography by generalized distribution amplitudes in pion-pair production process $γ^{*} γ \to π^{0} π^{0}$ and gravitational form factors for pion

S. Kumano, Qin-Tao Song, O. V. Teryaev

Hadron tomography can be investigated by three-dimensional structure functions such as generalized parton distributions (GPDs), transverse-momentum-dependent parton distributions,…

hep-ph2017★ 3 cited

Automatic calculation of two-loop ELWK corrections to the muon ( $g$ -2)

Tadashi Ishikawa, Nobuya Nakazawa, Yoshiaki Yasui

Two-loop electroweak corrections to the muon anomalous magnetic moment are automatically calculated by using GRACE-FORM system, as a trial to extend our system for two-loop calcula…

hep-ph2017★ 38 cited

The issue of gauge choice in the Landau problem and the physics of canonical and mechanical orbital angular momenta

M. Wakamatsu, Y. Kitadono, P. -M. Zhang

One intriguing issue in the nucleon spin decomposition problem is the existence of two types of decompositions, which are representably characterized by two different orbital angul…

hep-ph2017★ 15 cited

Cosmological implications of Standard Model criticality and Higgs inflation

Yuta Hamada, Hikaru Kawai, Yukari Nakanishi +1

The observed Higgs mass indicates that the Standard Model can be valid up to near the Planck scale $M_{P}$ . Within this framework, it is important to examine how little modifi…

hep-ph2017★ 1 cited

Counting the number of Feynman Graphs in QCD

T. Kaneko

Information about the number of Feynman graphs for a given physical process in a given field theory is especially useful for confirming the result of a Feynman graph generator used…

hep-ph2017★ 10 cited

Gravitino Problem in Inflation Driven by Inflaton-Polonyi Kähler Coupling

Fuminori Hasegawa, Kazunori Nakayama, Takahiro Terada +1

We discuss the cosmological gravitino problem in inflation models in which the inflaton potential is constructed from Kähler potential rather than superpotential: a representative…

hep-ph2017★ 245 cited

Revisiting Big-Bang Nucleosynthesis Constraints on Long-Lived Decaying Particles

Masahiro Kawasaki, Kazunori Kohri, Takeo Moroi +1

We study effects of long-lived massive particles, which decay during the big-bang nucleosynthesis (BBN) epoch, on the primordial abundances of light elements. Compared to the previ…

hep-ph2017★ 68 cited

Hidden-charm and bottom meson-baryon molecules coupled with five-quark states

Yasuhiro Yamaguchi, Alessandro Giachino, Atsushi Hosaka +3

In this paper, we investigate the hidden-charm pentaquarks as $D ˉ^{(*)} Λ_{c}$ and $D ˉ^{(*)} Σ_{c}^{(*)}$ molecules coupled to the five-quark states. Furth…

hep-ph2017★ 59 cited

Model-Independent Determination of the Triple Higgs Coupling at $e^{+} e^{-}$ Colliders

Tim Barklow, Keisuke Fujii, Sunghoon Jung +2

The observation of Higgs pair production at high-energy colliders can give evidence for the presence of a triple Higgs coupling. However, the actual determination of the value of t…

hep-ph2017★ 121 cited

Improved Formalism for Precision Higgs Coupling Fits

Tim Barklow, Keisuke Fujii, Sunghoon Jung +5

Future e+e- colliders give the promise of model-independent determinations of the couplings of the Higgs boson. In this paper, we present an improved formalism for extracting Higgs…

hep-ph2017★ 22 cited

Interplay between chiral symmetry breaking and the QCD Kondo effect

Kei Suzuki, Shigehiro Yasui, Kazunori Itakura

We investigate the interplay between the (light-light quark) chiral condensate and heavy-light quark condensate induced by the QCD Kondo effect, which is described by an effective…

hep-ph2017★ 46 cited

Electroweak Vacuum Collapse induced by Vacuum Fluctuations of the Higgs Field around Evaporating Black Holes

Kazunori Kohri, Hiroki Matsui

In this paper, we discuss the Higgs vacuum stability around evaporating black holes. We provide a new approach to investigate the false vacuum decay around the black hole and clear…

hep-ph2017★ 46 cited

Gravitational waves from first-order phase transitions: Towards model separation by bubble nucleation rate

Ryusuke Jinno, Sangjun Lee, Hyeonseok Seong +1

We study gravitational-wave production from bubble collisions in a cosmic first-order phase transition, focusing on the possibility of model separation by the bubble nucleation rat…

hep-ph2017★ 16 cited

A Framework for Finding Anomalous Objects at the LHC

Amit Chakraborty, Abhishek M. Iyer, Tuhin S. Roy

Search for new physics events at the LHC mostly rely on the assumption that the events are characterized in terms of standard-reconstructed objects such as isolated photons, lepton…

hep-ph2017★ 129 cited

Gravitational waves from bubble dynamics: Beyond the Envelope

Ryusuke Jinno, Masahiro Takimoto

We study gravitational-wave production from bubble dynamics (bubble collisions and sound waves) during a cosmic first-order phase transition with an analytic approach. We first pro…

hep-ph2017★ 8 cited

Absolute Lower Bound on the Bounce Action

Ryosuke Sato, Masahiro Takimoto

The decay rate of a false vacuum is determined by the minimal action solution of the tunnelling field: bounce. In this Letter, we focus on models with scalar fields which have a ca…

hep-ph2017★ 2 cited

Beam polarization effects on top-pair production at the ILC

Nhi M. U. Quach, Yoshimasa Kurihara, Khiem H. Phan +1

Full one-loop electroweak-corrections for an $e^{-} e^{+} \to t t ˉ$ process associated with sequential $t \to b μ ν_{μ}$ decay are discussed. At the one-loop level, the…

hep-ph2017★ 35 cited

Closing in on the chargino contribution to the muon g-2 in the MSSM: current LHC constraints

Kaoru Hagiwara, Kai Ma, Satyanarayan Mukhopadhyay

We revisit the current LHC constraints on the electroweak-ino sector parameters in the minimal supersymmetric standard model (MSSM) that are relevant to explaining the $(g - 2)_{μ}$ an…