Daily Bulletin

General Announcement - Day 3, July 7 (Sat), 2018

Banquet

• When - July 9 (Mon) 19:00-21:00
• Where - Vista Hall, B2F, Vista Walkerhill Seoul (Approx. 30 mins by bus)
• Round-trip shuttle buses are prepared
• Shuttle buses will depart from 18:40 at COEX North gate. A bus arrives every 2 minutes until 17:10. There will be enough buses for all participants.
• TSeo attend the banquet, tickets must be purchased in advance. Please visit the registration desk on 1F for purchase (USD 100 for on-site purchase)

Public Lecture

• Public Lecture I - July 8 (Sun) 19:00-21:00, Auditorium, 3F, COEX “The strange world of elementary particles” by Gian Giudice (Head of Theoretical Physics, CERN)
• Public Lecture II - July 10 (Tue) 19:30-21:00, Auditorium, 3F, COEX “Quarks and the Cosmos” by Michael Turner (Professor, University of Chicago)
• ICHEP2018 Registrant : No further sign up / registration is required. Participants can enter the hall using the nametag
• Lectures will be given in English, and English-Korean simultaneous interpretation services are available - if you wish to borrow a receiver, you must bring your identification card with you.
• A book signing event will take place at the end of Public Lecture I. Prof. Gian Giudice will sign copies of “A Zeptospace Odyssey”.

Photo session

• When - July 9 (Mon) 12:00-12:15
• Where - Auditorium, 3F, COEX
• How - Everybody will stand, facing the back side of the auditorium; some will be asked to come up on stage. The picture will be taken from the 2nd Floor of Auditorium.

Day 3, July 7 (Sat) - Last day of Parallel Session and Exhibition Hall

• Industrial Exhibition and events will operate until July 7 (Sat) 18:00. Please come to Exhibition Hall (D2) to say goodbye to our exhibitors and get your calligraphy/caricature done!
• Poster removal: July 7 (Sat) 18:00-19:00
• Remaining posters will be removed and disposed.
• Grand Ballroom (1st Floor) and Hall D2 (3rd Floor) will no longer be in use from July 8 (Sun). Water stations, coffee breaks and registration desk will be moved to Auditorium Lobby, 3F

Session Summaries - Day 3, July 6 (Fri), 2018

The second day at ICHEP 2018 continued with 15 parallel sessions and poster session, including three new parallel sessions. The poster session in the afternoon was crowded with lively feedback and discussion from a lot of participants, and Prof. Young Kee Kim (chair of ICHEP 2016) taught participants Korean traditional dance during the poster exhibition hall. There was a satellite meeting for CEPC in the evening.

Highlights of parallel sessions are presented below.

Beyond the Standard Model

• The focus of BSM session on the second day was mainly searching for vector-like quarks and new phenomena with resonance and non-resonance at the LHC, long-lived particles at LHCb, HPS, MATHUSLA, etc, and probes of light dark matter and dark photon at Belle, BABAR, KLOE/KLOE-2, LDMX, etc.
• ATLAS and CMS showed updates on limits for heavy resonances with dibosons, dileptons, and diphotons, as well as non-resonant dileptons and diphotons.
• Late decoupling of semi-annihilating dark matter and AMS-02 positions, dark matter constraints in SUSY and non-SUSY models, dark showers with broken U(1), gravitational waves from phase transitions, have been discussed.
• Composite Higgs models with dilaton, Littlest Higgs models, and general 2HDM were revisited at LHC 13 TeV.

Neutrino Physics

• The second day of neutrino session is mainly devoted to neutrino cross-section and flux measurements by ENUBET, NUSTORM, NA61/SHINE, MINERvA for current/future long baseline neutrino experiments. Clearly, these measurements are very important to reduce the systematic errors for determining CPV and neutrino mass ordering.
• The first observation of Coherent Elastic neutrino-Nucleus Scattering (CEvNS) cross-section was made by COHERENT experiment using CsI detector at the Spallation Neutron Source (Oak Ridge National Lab) after 43 years from the first prediction. The measurements will continue with different targets and with higher precision. There is very interesting potential with CEvNS such as neutron form factors, astrophysics, and SM/BSM physics.
• Better approximate expressions of P(nu_mu -> nu_e) in matter are obtained for the future neutrino physics experiments, DUNE and Hyper-K. EM properties of neutrinos were first studied in 1976 (by J.E. Kim), and further studies have been done by other groups, and they are measured (upper limits) in different experiments/observations.

Quark and Lepton Flavor Physics

• In the morning, results on CKM precision were presented. Some of the highlights include:
  - A new study of |Vcb| with B→D* l ν from Belle was reported and it appears to solve the longstanding inclusive - exclusive puzzle.
  - Recent results on CP violations in B0 -> D(*)0 h0 (with D0 -> KS pi+ pi-) from a joint Babar+Belle publication was reported. It provides now 7 σ evidence for a positive Φ1/β value.
  - Important results from LHCb on CP violations in B decays to charmonia now pins down strong penguin contributions in Φ1 / β determinations, which was a formerly limiting factor on theoretical precision.
  - First B→J/ψ K events from Belle II were presented with the first commissioning data set, clearly showing that Belle II is running on track.
  - LHCb now pushes down the precision on γ / Φ3 to 5 degrees; there seems to be some curious tension between B and B_s results.
• In the afternoon, results on CP violation and also on charm physics were provided, including the following subjects:
  - New searches for CP asymmetry in 2-body and 4-body baryonic Λb decays by LHCb were reported.
  - Recent searches for large local CP asymmetry in 3-body B decays by Belle and LHCb were presented. The studies used amplitude analyses to uncover the source of the strong phase.
  - BES III showed new amplitude analyses of D→Kπππ decays, and a huge number of precise branching fraction measurements of open charm states were presented.
• On Saturday, July 7, reports on charm system will continue, and there will be presentations on strange system as well as results on leptonic flavor physics.

Dark Matter Detection

• So far we have not yet had any convincing “direct” experimental detection of dark matter (DM) particle(s) despite several clues from the heaven. Nevertheless, various models and approaches have recently been proposed for accommodating new DM particles and linking our visible sector to some hidden sectors. Today we had only one parallel session for DM detection with 7 interesting and valuable talks, but only three works are highlighted because of the lack of space.
• Jinmian Li et al have considered Higgs portal models with fermion, vector and scalar DM particles and claimed that even if any parameter space of the models cannot be probed at the LHC, a 500 GeV ILC and a 100 TeV. proton-proton collider may enable us to probe a significant portion of the model parameter space and to distinguish the models.
• Gaurav Tomar et al have classified the most general interactions between scalar or fermionic WIMP with nuclei in the framework of effective field theory and found previously ignored non-standard and momentum-dependent interactions to the standard spin-independent and spin-dependent interactions. Based on this general set of terms, they studied exclusion limits for the newly arising interactions from various existing DM-related experiments.
• Jong-Chul Park et al proposed exploiting the potential of a prototype of the Deep Underground Neutrino Experiment (DUNE) or ProtoDUNE for probing the BSM physics in the so-called boosted DM context, consisting of two DM particles with a large mass ratio. In this scenario, a pair of relativistic lighter DM particles can be produced from the pair annihilation of heavy DM, followed by the conversion of a lighter DM particle into a heavier DM leading to (in)visible signatures characterizing this scenario. ProtoDUNE is expected to have excellent sensitivities to a wide range of boosted DM scenarios, allowing a deeper understanding of non-minimal dark sector physics.
• Hopefully, with ever-increasing sensitivities from various types of experiments, just a few DM models among those many DM scenarios will survive in the near future, eventually converging to a truly compelling model.

Top Quark and Electroweak Physics

• The morning session started with a pedagogical introduction to Effective Field Theory in the top quark sector (Miller). The presentation showed a detailed discussion of the pros and cons of SMEFT in the top quark sector including a shopping list of requests to the LHC analysis teams to allow complete fits using the top quark measurements from the LHC and the Tevatron.
• Further input to generator tuning of top quark pair production was provided in a detailed talk by the CMS collaboration, focusing on the reasonable description of top production by MC, except for the transverse momentum of the top quark where higher-order corrections are needed (Zenaiev).
• The ATLAS collaboration presented multiple new results for ICHEP 2018 using the 2016 data on BSM-sensitive measurements in the top quark sector, such as top quark spin correlations that digress from the Standard Model (3.2 standard deviations) and a new analysis looking for the production of four top quarks in all final states except the all hadronic, which observes an excess of 2.8 standard deviations above the background-only hypothesis, somewhat higher than expected from the SM (Peters).
• One of the more important links in the Standard Model is the link between the top quark and the Higgs boson(s), which was highlighted in an informative theory-oriented talk by Kao.
• The session was closed looking forward, to the potential of measuring the top quark and its physics at extremely high precision in the CLIC electron-positron collider, that would have direct access to the top Yukawa coupling (incl. CP admixture) and would significantly enhance the sensitivity to some of the Effective Field Theory operators even when only using rate information (Schoor).
• The afternoon session focussed on determinations of the weak mixing angle and related key electroweak observables.
• It started out with results on the weak mixing angle from the Tevatron (Siqi Yang and Liang Han) and included new results from the muon channel by D0.
• Next up were electroweak gauge boson production cross sections at CMS (Ilya Gorbunov), ATLAS (Manuella Vincter) and LHCb (Pavel Krokovny). A special treat was the brand new weak mixing angle extraction from ATLAS using 8 TeV data which can already compete with the most precise results obtained at LEP.
• The closing portion of the session was dedicated to future high-energy lepton accelerators. It permitted a glimpse at possible measurements searching for Standard Model deviations in high-precision observables at the ILC (Sviatoslav Bilokin), the CEPC (Zhijun Liang) and the FCC-ee (Tadeusz Lesiak) with orders of magnitudes reductions in uncertainties and the corresponding increase in discovery reach.

Detector: R&D for Present and Future Facilities

• Detectors for flavor physics was the focus for the morning and various general detector R&D for a wide range of physics research in the afternoon.
• Reports from ATLAS and CMS on trigger strategies and reconstruction performance, as well as contributions from the ALICE collaboration on the upgrades of the tracking system and forward detectors. Detector studies for future collider, including results on a prototype for LumiCal, were also discussed.

Astro-particle Physics and Cosmology

• In Astrophysics/Cosmology and BSM session, several leptogenesis scenarios, comparison of various Dark Matter models with the current experimental data, electroweak phase transition beyond the SM with a singlet scalar were discussed.
• The AMS Collaboration presented several new results on cosmic ray electrons, positrons, antiprotons and nuclei.
  - AMS 1: Distinctly different rigidity dependence of primary (He, C, O) and secondary (Li, Be, B) cosmic rays. Above 200 GeV they all deviate from a single power law, but the spectral indices of secondary cosmic nuclei harden more than those of primaries, pointing to new effects in the cosmic ray propagation.
  - AMS 2: The cosmic Nitrogen flux is well described by the linear combination of the primary and secondary fluxes in the entire energy range. This yields the measurement of the N/O ratio at their origin without the need to consider the propagation effects in the Galaxy.
  - AMS 3: The positron flux measured by AMS is consistent with isotropy and shows a considerable softening above ∼300 GeV. This behavior points to a new source of high energy positrons, either from Dark Matter annihilation or from a new astrophysical source.
• High energy astrophysical neutrinos, observed by IceCube, are much softer than expected from the Fermi shock acceleration mechanism. Potentially, this can be explained if neutrino interactions are modified by CPT violation.
• ANTARES and IceCube presented combined results on Dark Matter searches from the Galactic center, yielding new limits for DM masses in the range from 65 to 1000 GeV.
• Prospects for SNR relic neutrino detection by Super-K were presented. The possible deployment of the second Hyper-K detector in Korea was also discussed.
• A large area detector project, GRAND, based on radio-detection techniques was presented, calling the interested institutions to join.

Dark Matter Detection: Collider (June 5)

• CMS presented the new results on the dark matter searches using Monophoton, Top pair, Boosted mediator, Mono-H and Mono-Leptoquark channels. There was no significant excess from the dark matter signal and exclusion region of parameter space with dark matter and its mediator masses are set.
• Dark photon searches are reported by BES and Belle, respectively. 2.93 fb^{−1} ψ(3770) of BES data are analyzed and observed no obvious peaking structures for dark photon. They provided new constraints on dark photon mass. Belle II is in the middle of early data taking and new results for dark photon search will be reported in near future.
• The PADME is first experiment to study the reaction e+e- → γA’, A → χχ with a model independent approach. The PADME data taking is now starting and the new results are expected soon. The Beam Dump experiment for dark sector particles in the 1-1000 MeV mass range, is conditionally approved (PAC44) to run parasitically at Jefferson Lab for 41 week at 11 GeV and 65 μA current.
• The HPS experiment searching for a heavy photon has successfully completed engineering runs in 2015 and 2016. No significant excess was not found and exclusion region on the heavy photon are set. Major upgrades for trigger and SVT are planned by Jan on 2019. Significant improvement is expected on the heavy photon search.

Heavy Ions

• Heavy ion session today is focused on correlations and collective motion.
• Anisotropic flows in PbPb at 5.02 TeV at ALICE is reported that it is compatible with those at 2.76 TeV.
• HYDJET++ has improved the soft component part including full a set of thermal resonance production in addition to HYDJET hard component, reproduce the experimental data for PbPb collisions at LHC energies well.
• Elliptic flow of direct photon at ALICE experiment is found nonzero for central and semi central PbPb collisions.
• The first investigation of Collectivity in deep inelastic electron-proton scattering at HERA is presented.
• Also, ATLAS measured standard, symmetric and asymmetric cumulants with standard and subevent methods in pp, p+Pb and Pb+Pb collisions, and confirmed long-range azimuthal correlations and collectivity in small systems.
• Two-Particle Correlation in e+e- Collisions at 91.2 GeV with ALEPH Archived Data is firstly investigated and no significant ridge signal is observed.

Strong Interactions and Hadron Physics

• We started the day with a session dedicated to theoretical presentations including lattice QCD. There we learned that the lattice calculations can eventually help resolve the current experimental discrepancies between different methods of measuring the neutron lifetime.
• In the second and third sessions, we moved to jets and fragmentation related measurements. One interesting aspect was shown by ALICE indicating a potentially non-universal behavior for heavier baryon fragmentation when comparing baryon to meson ratios with e+e-. Several precise jet cross section measurements from LHC and HERA were shown.
• The last session of the day went back to fundamental parameters of QCD as extracted from either the lattice, HERA, LHC or future colliers. Also, new pdf fits using HERA heavy flavor data were shown.

Higgs Physics

• Both ATLAS and CMS showed updates of Higgs boson coupling measurements in the diphoton and four-lepton decay channels. The results are consistent with the Standard Model predictions. CMS presented the interpretation of the measured Higgs boson transverse momentum distribution in the framework of coupling modifiers for Higgs boson couplings to t-, c- and b-quarks.
• ATLAS updated the measurement of the off-shell signal strength in the four lepton decay channel with 2015-2017 data, which, assuming the on- and off-shell signal strength is the same, sets an expected (observed) limit on the Higgs boson width of 14.4 (15.2) MeV.
• Both ATLAS and CMS showed updates of the searches for di-Higgs production, including the 4b non-resonant search using 36 fb^-1 in CMS and the bbtautau search with 80 fb^-1 in ATLAS, as well as a combination of the searches by CMS. The achieved observed (expected) sensitivity in the non-resonant search is now down to 12.7 (14.8) times the SM (ATLAS, bbtautau, 80 fb^-1).
• New light resonances in composite Higgs models with non-minimal cosets, heavy resonances and electroweak precision observables for the global fit in Higgs EFT were discussed.
• Several theoretical challenges (EFT analysis, deep learning, etc.) looking for the di-Higgs production were extensively discussed.

Computing and Data Handling

• In the computing and data handling session, simulation and simulation related tools were discussed, with the emphasis on the most recent developments. The GEANT4 update to version 10.4 is going to improve the shower shape in calorimeters and benefits research on future detectors. The assessment of the most recent data libraries for particle transport showed both the improvement and inconsistencies, implying that careful attention is needed when dealing with these libraries. LHCb presented two subjects: the simulation structure for the fixed target and heavy ion collision modes, and the various scenarios of fast simulation with practical examples.
a
• The Saturday morning session will be about the current developments of HEP computing models. In the afternoon sessions, various talks will be presented on the reconstruction strategies and performances of jets, missing energy, muon ID and particle ID.

Accelerator: Physics, Performance, and R&D for Future Facilities

• Many results on new technologies for high energy particle accelerators have been presented including superconducting RF cavities, high field magnets and plasma acceleration.
• Discussions of design and construction plans of various new accelerator facilities, including tau-charm factory at Novosibirsk, have been presented.
• Presentations about CERN's FCC program started from the physics program overview and plans for FCChh and FCCeh options.
• Highlight 1 for Saturday: the program covers multiple lepton colliders proposals, as Z, W, Higgs and top factories - FCCee, ILC, CLIC and CepC.
• Highlight 2 for Saturday: the design of lepton colliders at low collision energy for muon pairs production as well as of the 3-15 GeV electron beam facility at CERN will be presented.

Formal Theory Development

• Formal theory had two sessions and 6 talks.
• Hee-Cheol Kim (Postech) talked about the recent classification of Calabi Yau 3-manifolds which leads to 5 dimensional superconformal field theory when put in M-theory. These theories are much more constrained than the 4 dimensional case and will be useful for the study of string-theory embeddable quantum field theories.
• Jinbeom Bae (KIAS) talked about his recent work on the bootstrapping approach to conformal field theories and its implication on the weak gravity conjecture in the light of AdS/CFT correspondence.
• Pablo Diaz (IBS) reported on his recent construction of a tensor model, apparently motivated by the currently fashionable Sachdev-Yeh-Kitaev model. This model seems to demand further analytic and numerical studies.

Education and Outreach

• Belle has tried some new educational and outreach programs
  - Public data analysis using visual programming
  - Belle II is in Virtual Reality and available on the steam store (store.steampowered.com/app/810020/)
  - Interactive live broadcasts of Belle II Roll-in and SuperKEKB First Collisions.
• ATLAS open data project for everyone is making ATLAS data available to everyone on pretty much every platform. For the social media outreach, they are having success by optimizing content to suit the different social mediums.
• LHC Masterclasses are making 14k high school students into scientists for one day, involving 225 universities and labs from 52 countries.
• CERN has its own education research projects including teacher programs, S’Cool Lab, Beamline competition and internships.
• The technical advantage is clearly demonstrated by the whole HEP outreach community, inspiring the next generation of physicists!

Technology Applications and Industrial Opportunities

• The original goals of HL-LHC for the instant luminosity and for the integrated luminosity are 5 times 10³⁴ cm^-2s^-1 and 3000 fb^-1 twelve years after the upgrade. Using the ultimate performances achieved in 2015-16, the HL-LHC could reach at the instant luminosity of 7.5 times 10³⁴ cm^-2s^-1 and ultimately the integrated luminosity of 4000 fb^-1.
• After the construction of the Pohang Light Source (PLS) in Korea, several large science projects, such as KSTAR, KOMAC, RAON, KSLV, KHIMA and ITER, have been deployed with large scales in costs and technical complexities that lead a significant change in the industrial sector.
• Looking to the future of large-scale science projects such as CEPC-SppC, the CEPC Industrial Promotion Consortium (CIPC) has been established in 2018, and they have worked closely with Chinese academic institutions and Universities not only for CEPC but also for ILC, JUNO, and Jinping Dark matter experiment, etc.
• With the exascale era in computing on the horizon, nVidia showcased their success stories from LIGO and ITER to accelerating drug discoveries, monitoring Earth’s vitals to earthquake predictions.
• The CERN Knowledge Transfer (KT) group works on maximizing the technological and knowledge return to society. The CERN KT strategy through dissemination and impact was presented. Medical applications and HEP technologies used in cultural heritage were just two of the many successful examples shown.
• AMS is a semiconductor company providing sensor solutions for many different applications. Several examples of monolithic photonics sensors have been presented, highlighting the challenges that have to be met to develop this novel product. The back-end options include an on-wafer filter deposition leading to novel products like Fabry Perrot interferometric sensors which can be included in consumer products.
• MECARO, together with CERN and RD51, started to work on GEM foils in 2013. It further developed the GEM manufacturing process, able to now produce large area GEM foils for the CMS muon upgrade and other applications outside HEP.
• The ALICE ITS project is currently building the upgrade of the silicon tracker using monolithic CMOS silicon pixel sensors. Several Korean companies are involved in the various steps involved in the production of the tracking detector, either providing custom developed measurement machines or doing post-processing of the CMOS wafers.