Theoretical Physics Division Zhizhong Xing Structure and mission

Theoretical Physics Division Zhi-zhong Xing Structure and mission Improvements since 2013 CFHEP as a new platform Recruiting and remolding Progress made since 2013 Research achievements International visibility Vision and challenges Institute of High Energy Physics, June 13, 2018

Structure and mission Manpower Currently 21 scientists, 2 secretaries, 55 students, and 15 postdocs The age structure of 23 staff members (4 female): Age (years) 30— 39 Senior staff 1 Junior staff 6 Secretaries 2 Sum 9 Percent 39% 40— 49 6 0 0 6 26% 50— 59 7 0 0 7 31% 60 1 0 0 1 4% Sum 15 6 2 23 100% Percent 66% 26% 8% 100% There is room to recruit a few more young researchers in the future Mission · Phenomenological studies: closely follow developments of domestic and international experiments in particle and astrophysics · Theoretical exploration: freely work on fundamental TH problems · Education and outreach: teaching, training and scientific outreach

Assessment results in 2013 Evaluation of international position: Position Please Tick Leader infield (international first-tier) Closely follows the international cutting edge, internationally influential Making great progress, has distinctive X characteristics Ordinary Evaluation of domestic position: Position Please Tick Domestic highest level Competitive with its own characteristics X Ordinary Remarks C Remarks B Evaluation Committee suggestions · take advantage of the to-be-established CFHEP to enhance visibility · recruit excellent young faculty to remold research teams/directions · strengthen “energy frontier” physics, lattice QCD, neutrino physics; and widen the research scope of particle astrophysics and cosmology.

Improvement A: CFHEP as a new platform The launch of CFHEP on 17/12/2014, focusing on the Energy Frontier Director: Nima Arkani-Hamed Deputy director: Cai-Dian Lv Research activities: • Workshops + schools • Series of lectures • Seminars • Collaborative works • Postdoctoral program • CEPC CDR-TH writing Example: Wen Yin, a CFHEP postdoc (2017), is carrying out successful collaboration with A. Guth (MIT, USA), T. Yanagida (IPMU, Japan), …. .

Cutting-edge activities and public outreach Visiting theorists: • S. Brodsky • A. Falkowski • D. Gross • T. Han • G. Kane • D. Kosower • L. Maiani • M. Mangano • H. Murayama • M. Peskin • M. Recee • R. Sundrum • G. ‘t Hooft • L. T. Wang • E. Witten • and many others

Improvement B: recruiting and remolding Since last assessment, we have successfully recruited 4+1 excellent young researchers, with national (3) or CAS (1+1) funding support. ¨ Ming Gong, lattice QCD, from USA ¨ Shun Zhou, neutrino physics, from Europe ¨ Hao Zhang and Cen Zhang, Te. V physics, from USA ¨ Jing Ren, Higgs/gravitational wave physics, from Canada Currently there are 21 scientists and 6 directions at TPD: Perturbative QCD (4) Higgs and Te. V physics (3) Neutrino physics (2) Lattice (nonperturbative) QCD (3) Astrophysics and cosmology (4) Hadron and nuclear physics (5) After Jing Ren joins us in July, the layout will look more reasonable.

Highlight: Higgs, Te. V and GW physics Research at the energy frontier has been strengthened since 2013 ¨ Zhao Li, supported by CAS Youth Innovation Promotion Association Expertise in SM precision test, Te. V physics, collider phenomenology ¨ Hao Zhang, supported by National Youth Thousand Talents program Expertise in Higgs physics and new physics, collider phenomenology ¨ Cen Zhang, supported by National Youth Thousand Talents program Expertise in SM effective field theories, top physics and Te. V physics ¨ Jing Ren, to be supported by CAS Hundred Talents program Expertise in Higgs physics, quantum gravity and gravitational waves § ~24 papers in 2016/17 § Results cited by ATLAS, CMS, and theorists § CDR-TH of CEPC Zhao Li Hao Zhang New direction: GW phenomenology Cen Zhang Jing Ren

k r a Example 1: top quark and new physics u q p to New physics Example 2: Higgs and new physics They have kept high-level external collaboration after coming back to China Hig gs

Statistics of publications 2013—— 2017 In the past five years we have published ≥ 500 peer-reviewed papers. Journal REV MOD PHYS REPT PROG PHYS NAT COMMUN PROG PART NUCL PHYS NAT ASTRON PHYS REV LETT J HIGH ENERGY PHYS ASTROPHYS J EUR PHYS J C CHIN PHYS C MON NOT R ASTRON SOC PHYS LETT B J COSMOL ASTROPART PHYS REV D COMPUT PHYS COMMUN PHYS REV C NUCL PHYS B CLASSICAL QUANT GRAV ANN PHYSC-BERLIN. . . Impact factor (2017) Number of papers 36. 917 14. 311 12. 124 11. 229 launched in 2017　 8. 462 1 1 2 12　 6. 063 5. 533 5. 331 5. 084 4. 961 4. 807 4. 734 4. 557 50 7 25 63 14 31 5 139 3. 936 3. 820 3. 678 3. 119 3. 039 <3. 000 P TO GO O D 1 16 e 11 g a er 3 v 1 a ~70

Hadron physics and lattice QCD § A lot of timely and high-impact research has been carried out to understand the newly observed X / Y / Z (exotic) hadronic states § Much effort has been made in exploring scalar and tensor glueballs via lattice QCD simulation § Among ~150 publications, 5 PRL, 1 RMP+1 PPn. P (review) Example 1: exotic hadrons Example 2: LQCD/glueballs BESIII 李先生引用 6次

High impact topical review Hadronic molecules Rev. Mod. Phys. 90 (2018) 015004 F. K. Guo (ITP, former Ph. D) C. Hanhart (Juelich Center) Ulf-G. Meissner (Uni Bonn) PI Q. Wang (Uni Bonn, former Ph. D) Q. Zhao (IHEP) PI B. S. Zou (ITP, former faculty) Experimental evidence of various candidates of hadronic molecules and methods of identifying such structures are reviewed. Both the production mechanisms and the decay properties are elaborated. Successful international collaboration!

Highlight: Sino-German collaboration 21 March 2014 Phase I: finished with excellent marks; Phase II: ongoing and fruitful 李先生引用 6次 High quality / productive Faculty level Postdoc level Student level Seven senior staff ! Other international group collaborations: Sino-French, Sino-Russian…

Heavy flavor physics and perturbative QCD § Higher-order QCD corrections were calculated to deeply understand heavy quark decays and charmonium/bottomonium properties § Among ~70 publications, 6 PRL Example 1: bottomonium Example 2: B decay form factors Citations >100 A high-quality collaboration with Cambridge and MIT colleagues.

Example 3: quarkonium Example 4: heavy baryons The proposed golden decay mode: Discovered by LHCb, PRL 119 (2017) 112001 ar. Xiv: 1703. 09086

Neutrino physics and astronomy § Important contributions to the writing & editing of Neutrino Physics with JUNO——the Yellow Book of the JUNO experiment § New progress has been made in renormalization-group revolution of neutrino parameters, flavor symmetries and supernova neutrinos § Among ~60 publications, 1 NA, 1 NC +1 RPP (review) Example 1: neutrino astronomy Simulation using the fastest computer at the time——Tian He 2 (天河二号) m=0. 05 e. V The success of the Daya Bay experiment in 2012 motivated quite a lot of studies of neutrino astronomy and cosmology in China.

Example 2: quantum corrections The first particle physics paper published in this journal Example 3: flavor symmetry Behind neutrino oscillation data is a broken — reflection symmetry

Astrophysics, cosmology and gravity § Much theoretical effort has been made to explore physics potential of the Ali. CPT project——Principal Scientist: Xinmin Zhang § Dark energy/matter, PGWs, phase transitions, classical and quantum gravity, with ~120 publications Example: particle cosmology and GWs BICEP/Planck limit This direction will be strengthened after Jing Ren joins us in July. · Gravitational wave echoes through new windows (with B. Holdom, R. Conklin, ar. Xiv: 1712. 06517) · Fourth Award, Gravity Research Foundation 2016 Essay Competition (with B. Holdom) tes t mo able del pr e dic tio ns

Examples of other international visibility § Many plenary talks at important international conferences. Invited plenary review talk on neutrino theory at Lepton Photon 2015, Ljubljana (young researcher recruited in 2014) § Serving as editorial board members for important journals. · European Physical Journal C (2011——) · Scientific Reports (2016——) · Journal of Physics G (2017——) · Chinese Physics C (deputy editor-in-chief, 2016——) S. Zhou C. D. Lv § Serving as members in international academic organizations. · Commission on Particles and Fields (C 11), International Union of Pure and Applied Physics——IUPAP (since 2015) · Panel member of Starting Grant Evaluation——European Research Council——ERC (since 2015) Z. Xing The INSPIRE Advisory Board (since 2015) Some of us also serve as IAC members of some important international conferences and play active roles Q. Zhao

Education and outreach Theoretical Physics Division is the main body of Teaching and Research Section of Department of Modern Physics, School of Physical Sciences, University of Chinese Academy of Sciences. Philosophy: fusion of scientific research and teaching 科教融合 Almost all of us are engaged in graduate and undergraduate teaching Graduate courses (9) Undergraduate courses (9) ¨ Group theory ¨ Particle Physics II ¨ Lie Group and Lie Algebra ¨ Quantum Field Theory ¨ Gauge Theory ¨ General Relativity ¨ Advanced Electrodynamics ¨ Neutrino Physics ¨ Mechanics (General Physics) ¨ Atomic Physics ¨ Electromagnetics on i s is 14 ¨ Theoretical Mechanics m 20 w e ¨ Electrodynamics e n nc ¨ Quantum Mechanics si ¨ Quantum Field Theory ¨ Particle Physics ¨ Mathematical Methods in Physics Public lectures and training courses on frontiers of theoretical physics

Research resources FUNDING: the TPD’s funding is summarized in million (M) CNY. IHEP provides the TPD with 0. 5 M CNY annually for daily running. More computing resources are required to promote Lattice QCD study OFFICE space: currently ~1000 m 2, more is needed in next 5 years.

Summary, vision and challenges SUMMARY: we have made some visible progress since 2013. ¨ 4 + 1 young researchers recruited, with CFHEP as a new platform ¨ Higgs/top/Te. V, LQCD, neutrino and astrophysics strengthened ¨ Some high-quality and high-impact research results achieved ¨ International visibility in some other aspects improved ¨ Significant contributions to education and outreach made The TPD is at the top level domestically in several research directions, and is getting more and more international recognition. VISION and AMBITION: to become one of the world’s outstanding theoretical physics groups——a long way to go. Some challenges are: § More ground-breaking research work has been lacking § The Energy Frontier team needs a very influential leader § Quality and number of postdocs are lower than expected § Resources for attracting young staff not competitive § Large-scale computing and staff costs are imperative THANK YOU FOR YOUR ATTENTION