Sho's website

Undergrad work (2008; in japanese): Linear Collider –to-> Relic Density

The work I did in the “Undergraduate Research” course; this work was supervised by Dr. Masako Iwasaki, a lecturer of Aihara Lab. (lab on experimental particle physics).

We followed the work by Feng and Peskin and showed how precisely we can measure the mass of the superpaticles with the International Linear Collider.

Magisterial thesis (2010): Supersymmetry without R-Parity: Its Phenomenology

Dissertation (2013): Supersymmetry after the Higgs discovery and its LHC phenomenology

Lepton Flavor Violation and Cosmological Constraints on R-parity Violation

Stau Kinks at the LHC

Higgs Mass and Muon Anomalous Magnetic Moment in Supersymmetric Models with Vector-Like Matters

In 2012 summer, we had some 2σ indication of 130‒140 GeV Higgs boson. It was extremely heavier than expected, and if we assume the MSSM framework, such mass cannot be achieved without very very fine tuning, which was of a great depression. This depression stands out with taking the muon $g-2$ anomaly into consideration, which requires a much lighter SUSY scale.

So \n\n\nwe extend the MSSM with $\vc{10}+\overline{\vc{10}}$, or extra vector-like quarks. Such extra matters yields $y'Q'H\w u\bar U'$ coupling, which drastically lifts up the Higgs mass with the same mechanism as $y_t$, and with the help we can keep the SUSY scale lighter to achieve the SUSY explanation of the muon $g-2$ anomaly.

The 130-140 GeV Higgs signal disappeared soon as is usual for 2σ excesses, but this framework was used in the next paper.

LHC Dijet Signals in New Physics Models for Top Forward–Backward Asymmetry

Higgs mass, muon g−2, and LHC prospects in gauge mediation models with vector-like matters

Higgs mass and muon anomalous magnetic moment in the U(1) extended MSSM

This work is, similar to the previous work, a study on a model which can realize the simultaneous explanation of the Higgs mass and the muon $g-2$ anomaly. In this paper we extend the MSSM with an extra U(1) gauge symmetry. We first see that the simultaneous realization is certainly achieved, and then LHC phenomenology is discussed.

Vacuum Stability Bound on Extended GMSB Models

Muon g−2 anomaly and 125 GeV Higgs : Extra vector-like quark and LHC prospects (in proceedings)

Comment on the CMS search for charge-asymmetric production of W′ boson in ttbar + jet events

This article contains comments on a recent paper(1206.3921) by the CMS collaboration, where an inclusive search for new physics in $pp\to t\bar tj$ events. This search targets an extra $W'$ boson which couples to the top and down quarks, which motivated by the Tevatron top forward-backward asymmetry. We first tried to interpret their results on $M_{W'}\text{--}g_{\rm R}$ plane, but our calculated cross section does not match theirs, and we consider this possibility. This is a very short paper with 7 pages; especially the text is just for 3 pages. We wrote up this article in 3 days. Actually the PC spent more time on the calculation than I spent on the writing…

Gauge Mediation Models with Vectorlike Matters at the LHC

Muon g−2 vs LHC in Supersymmetric Models

Recent Result of the AMS-02 Experiment and Decaying Gravitino Dark Matter in Gauge Mediation

LHC SUSY searches after the Higgs discovery: respecting the muon g−2 (in proceedings)

Reconstructing Supersymmetric Contribution to Muon Anomalous Magnetic Dipole Moment at ILC

CP-safe Gravity Mediation and Muon g−2

SUSY is a good candidate to solve the discrepancy of muon $g-2$ between the experimental result and theoretical expectations. To this end, non-colored SUSY particles should be as light as O(100) GeV, while the Higgs boson mass suggests colored SUSY particles should be heavier than 1 TeV. This separation can be explained by non-universal gaugino mass, which though involves the risk of CP-violation because of phase misalignments among the gaugino masses. To solve this problem, we built a model which has no CP-violation to realize the non-universal gaugino mass.

This work was in collaboration with Tsutomu and Norimi; we were heading back from the cafeteria and talking the model to solve the anomaly; I was interested in gaugino mediation and told Tsutomu it was good, but he realized that CP-violation which the model involves is critically bad. Then we stop thinking, but a day Tsutomu suddenly came with a model. Norimi and I analyzed the model, and confirmed that the model fits to my purpose to solve the anomaly.

Long-lived sleptons at the LHC and a 100 TeV proton collider

This work shows how far we can search for long-lived charged particles in future colliders. To answer this question is, actually, not very interesting; just do Monte Carlo simulation, and that’s all. However, in this work, we realized two features at the future collider as important; one is the radiative energy loss of muons, which can only be seen in such high energy, and the other is the fact that we should carefully treat the momentum resolution in such high energy.

This work was originated in May 2014; I thought I could finish before long, but as our Monte Carlo simulation as well as statistical treatment was done very seriously, and the manuscript writing was with much argument, it finally took one year. (and also, as actually the biggest reason, because I moved from Japan to Israel in this period.)

LHC benchmarks from flavored gauge mediation

Diphoton signals from colorless hidden quarkonia

Physics at a 100 TeV pp collider: beyond the Standard Model phenomena (associated report)

Heavy bino dark matter and collider signals in the MSSM with vectorlike fourth-generation particles

Tagging new physics with charm

Probing minimal SUSY scenarios in the light of muon g−2 and dark matter

Dark quarkonium formation in the early universe