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The 1st KEK-KIAS-NCTS Joint Workshop on Particle Physics Phenomenology
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The 1st KEK-KIAS-NCTS Joint Workshop
on Particle Physics Phenomenology


Group photo of the joint meeting taken outside General Building III at NTHU.

A joint workshop between KEK (the High Energy Accelerator Research Organization, Japan), KIAS (the Korea Institute for Advanced Study) and the National Center for Theoretical Science (NCTS, Taiwan) on particle physics phenomenology was held at NCTS from May 26 to May 28, 2016.

This was the first meeting of this kind. We plan to make it an annual event by rotating the hosting of the workshop between one of the three organizations every year.

The main purpose of the joint workshop is to gather together particle theorists and experimentalists (faculty members, postdocs and PhD students) from various institutes in the three countries listed above, in order to report and share their latest respective research findings. Through interactions in the workshop, we may generate new ideas for further explorations and provide unique opportunities for collaborations among members from different institutes. We hope that this joint workshop will establish a network where the young researchers of our field would particularly benefit.

There were approximately 50 participants in the meeting, with 15 participants from Korea, 12 from Japan, one from India, one from the US, and the rest were from Taiwan.

NCTS Director Chong-Sun Chu delivering the opening speech.

NCTS Director Chong-Sun Chu gave an opening speech for this joint workshop. In this first meeting, we had 10 plenary sessions covering many important topics, including (1) summary talks from both ATLAS and CMS experiments from the Large Hadron Collider (LHC); (2) the 750 GeV diphoton anomaly; (3) gravitational wave probes; (4) dark matter and cosmology; (5) Higgs rare decays; and (6) lepton physics. In addition, we had two parallel sessions for postdocs and PhD students to present their results. For this meeting, we focused on topics in the area of phenomenology and cosmology; other and more formal topics may be included in future workshops.

Joint meeting in progress.

There were three LHC experimental talks presented by local physicists: George Wei-Shu Hou (NTU) summarized all the exciting CMS results at 7, 8 and 13 TeV, Jennifer Pai-hsien Hsu (NTHU) described some of the latest ATLAS results, and Chia-Ming Kuo (NCU) presented the most recent highlights from CMS.

The hottest topic in town was the 750 GeV diphoton excess reported by LHC at the Rencontres de Moriond meeting in March. We had two plenary sessions dedicated to the discussion of this issue. Altogether we had six talks on this hot topic delivered by Chuan-Ren Chen (NTNU), Pyungwon Ko (KIAS), Mihoko Nojiri (KEK), Jeonghyun Song (Konkuk), Po-Yan Tseng (NTHU) and Chaehyun Yu (AS). Each of these speakers proposed different new physics scenarios for the parent particle of this diphoton resonance. Regardless of whether this excess is real or just a statistical fluke, collecting and analyzing more data at the LHC can resolve this issue. New experimental results will not be announced until perhaps at the ICHEP meeting in Chicago this coming August or at the Rencontres de Moriond meeting at La Thuile next March.

On dark matter, Shigeki Matsumoto (IPMU) gave an overview on the weakly interacting massive particle (WIMP) paradigm, while Myeonghun Park (IBS/CTPU) reviewed the status of the search for WIMPs at LHC.

Ryuichiro Kitano discussed his idea of lattice axions.

On lepton physics, Eung Jin Chun (KIAS) discussed how to test the leptonic specific two Higgs doublet model at LHC using τ-rich signatures; Masashi Hayakawa (Nagoya) reviewed the current state-of-the-art Standard Model calculations of the muon anomalous magnetic dipole moment; and Guey-Lin Lin (NCTU) addressed how to determine the neutrino mass hierarchy using charged and neutral current interaction rates of supernova neutrinos.

Mihoko Nojiri presented her interpretation of the 750 GeV diphoton excess.

Kin-ya Oda discussed non-minimal gravitational couplings, the Jordan frame versus the Einstein frame and Higgs inflation in cosmology.

On gravitational wave probes, Ryusuke Jinno (KEK) presented the spectrum of gravitational waves due to bubble collisions in the early universe and Masahiro Takamoto (KEK) addressed the possibility of probing the classical conformal particle physics model using gravitational wave detectors.

Wai-Yee Keung discussed properties of Higgs decays in the Standard Model and beyond.

Furthermore, Ryuichiro Kitano (KEK) discussed axions on the lattice and its connection with the strong CP problem in QCD; Junji Hisano (Nagoya) reported on the update analysis on proton decay in supersymmetric grand unified theories; Wai-Yee Keung (UIC) and Jusak Tandean (NTU) discussed flavor-changing Higgs decays in a lepto-quark model and in the general framework of grand unified theories respectively.

In the two parallel sessions, we had a total of 12 talks, delivered by junior faculty members, young postdocs and PhD students from Korea, Japan, and India as well as from local participants.

Details of the program can be found at
http://phys.cts.nthu.edu.tw/actnews/ intro.php?Sn=271&OSn=620

From clockwise: George Wei-Shu Hou, Jeonghyun Song, Kin-ya Oda, and Kingman Cheung at the reception.

Kazunori Kohri discussed Higgs vacuum metastability in cosmology.

Yu-tin Huang (NTU) presented the only talk on formal topics in the joint meeting. He discussed various subtleties in the effective actions for simultaneous breaking of spacetime and internal symmetries.

Members of the organization committee of the joint workshop are as follows: Motoi Endo, Ryuichiro Kitano, Mihoko Nojiri and Yutaka Sakamura from KEK; Eung Jin Chun and Pyungwon Ko from KIAS; and Kingman Cheung, Cheng-Wei Chiang and Tzu-Chiang Yuan from NCTS. The next joint workshop will be held at KIAS with the dates yet to be determined.

Poster of the joint workshop.