Cep C workshop and goals F Bedeschi Cep

Cep. C workshop and goals F. Bedeschi, Cep. C workshop Rome, May 2018 Outline v Some history v Many “uncertain” options v The next steps v Workshop goals Cep. C workshop, Rome, May 2018 1 F. Bedeschi, INFN-Pisa

The Great Discovery! v After the Higgs. . . what next? v How to go beyond the SM? v Italian community started an internal discussion Ø CSN 1 community published summary 1. 5 yr of work by theorists and experimental physicists Frascati Phys. Ser. 60 (2015) pp. 1 -291 ISBN 978 -88 -864 -0999 -5 July 4 th, 2012 R. Barbieri, Plank 2017 Cep. C workshop, Rome, May 2018 2 F. Bedeschi, INFN-Pisa

Recommendations v Some key recommendations from CSN 1 White Paper ØCSN 1 urges INFN to continue and strengthen its support of R&D for the development of new high field magnets and conventional or un-conventional accelerator structures ØCSN 1 supports INFN participation in studies and R&D related to the future colliders. Our community must be part of the planning of the future. Cep. C workshop, Rome, May 2018 3 F. Bedeschi, INFN-Pisa

INFN Scientific Committee 1 v Fall 2016 new line of research on future accelerators created Ø Incubator future machines and future experiments Limited funding at present Ø Presently 84 physicists involved at small fraction of research time Ø Three main lines of research: EIC in the USA Muon Collider R&D Circular colliders: e+e- (main effort) and pp Parallel work on FCC-ee and Cep. C given the major uncertainties and the obvious synergies Some work on FCC-hh and SPPC Cep. C workshop, Rome, May 2018 4 F. Bedeschi, INFN-Pisa

Additional comments v EIC closer to the nuclear physics community Ø Will evolve in a separate activity in 2019 in CSN 3 v Muon Colliders could be the future of multi. Te. V lepton machines new ideas are being explored Ø R&D important. If successful next to next machine v An e+e- collider for a high precision study of EW phenomena is currently the preferred next big machine Especially if it is a first step for a future very high energy pp Ø It has a well defined strong physics program Ø It is technically feasible NOW Ø The cost scale is similar to LHC, thus expensive but affordable Cep. C workshop, Rome, May 2018 5 F. Bedeschi, INFN-Pisa

e+e- collider potential (1) v r e v o t en P E L m e v s o r c i p t a m i m e 0 t 2 s r y s o t g c a n i f d ~ u l c n i Courtesy of D. D’Enterria, FCC week 2018, Amsterdam Cep. C workshop, Rome, May 2018 6 F. Bedeschi, INFN-Pisa

e+e- collider potential (2) Ø ZH: One order of magnitude better than LHC No model dependence in BR measurements Accessible scale for new physics ~ several Te. V Courtesy of D. pre-CDR, D’Enterria, FCC week 2018, Amsterdam Cep. C 2015 Cep. C workshop, Rome, May 2018 7 F. Bedeschi, INFN-Pisa

The “uncertain” options v Linear (High energy): Ø ILC – Oldest project – Reviewed to death Staged: 240 Ge. V with reduced costs Will know by end of 2018? Ø CLIC – Rather old too Staged: 380 Ge. V to 3 Te. V Higgs and top at 380 Ge. V v Circular (High luminosity): Ø FCC – Kick-off 2014 Z, WW, ZH, tt Ø Cep. C – Pre-CDR 2015 Z, WW, ZH, tt Cep. C workshop, Rome, May 2018 8 F. Bedeschi, INFN-Pisa

Cep. C, FCC, ILC, CLIC luminosity comparison Z WW ZH 100 x. LEP FCC SR power/beam < 50 MW Cep. C SR power/beam < 30 MW Cep. C workshop, Rome, May 2018 9 F. Bedeschi, INFN-Pisa

Next major dates v ILC: December 2018 Ø Deadline for being included in the ESPP 2020 Assumed to be go/no go decision v FCC: Ø CDR by end of 2018 Ø ESPP 2020 update What will be pushed harder? Ø ESPP 2026 update (CERN decision time) v Cep. C: Ø CDR by end of 2018 Ø Working with MOST to be included in “Large international science projects” – 3 -5 (6 -10) preparatory/1 -2 (2 -4? ) construction now-2020 (2035) Cep. C workshop, Rome, May 2018 10 F. Bedeschi, INFN-Pisa

EU Schedule v FCC proposed schedule ? Courtesy of M. Benedikt, FCC week 2018, Amsterdam Cep. C workshop, Rome, May 2018 11 F. Bedeschi, INFN-Pisa

China schedule v Cep. C proposed schedule (ideal = optimistic) design issues R&D items pre. CDR design, funding R&D program Intl. collaboration site study Cep. C workshop, Rome, May 2018 seek approval, site decision construction during 14 th 5 - year plan commissioning Courtesy of Y. Wang, FCC week 2018, Amsterdam 12 F. Bedeschi, INFN-Pisa

Detectors for e+e- circular colliders v ILC/CLIC detectors already studied in considerable detail, so why bother? v ILC/CLIC detectors are not optimized for circular colliders Ø Basic resolution requirements similar Ø Many common developments Ø Same solutions not always viable Ø Different optimizations Cep. C workshop, Rome, May 2018 13 F. Bedeschi, INFN-Pisa

Differences with ILC v ILC Cep. C workshop, Rome, May 2018 14 F. Bedeschi, INFN-Pisa

Other drivers v Extreme statistical resolution on Z pole Ø Acceptance systematics control is critical Both charged and neutrals at few mm level v Extreme systematics control required by luminometers Cep. C workshop, Rome, May 2018 15 F. Bedeschi, INFN-Pisa

Workshop agenda & goals v Present status of all e+e- options for the post-LHC era Ø Accelerator designs and associated constraints on detectors (Plenary+MDI) Ø Detector concepts/Physics potential and associated constraints on detectors (Plenary+Physics) v Current status of the Cep. C machine and related topics (Parallel) v Current status and future work on simulation studies (Parallel) v Current status and future R&D plans for detectors (2 parallel) Ø Potential for joint developments for FCC and Cep. C Ø Understand synergies with solutions designed for ILC/CLIC Ø Mix communities interested in similar physics and similar detector issues v Panel discussion: Ø Future collider options – What do we want in the ESPP 2020? Ø Beyond CDR’s - How do we want to structure future R&D? Cep. C workshop, Rome, May 2018 16 F. Bedeschi, INFN-Pisa

Final comments (1) v 2018 is an important year: Ø Cep. C and FCC complete the CDR’s Ø Input to ESPP 2020 Ø Japan gives final answer on ILC (? ) v The years that follow will be more focused Ø Should be ready to act in case of strong ESPP recommendations Ø Should be ready to act in case MOST grants major funds for Cep. C v 2019 -2025: major overlap with other activities draining human and financial resources Ø LHC upgrades Ø Many accelerator projects in China Cep. C workshop, Rome, May 2018 17 F. Bedeschi, INFN-Pisa

Final comments (2) v Joining forces is absolutely needed to be effective in the next critical years Ø Also helps to prepare international proto-collaboration that should be ready when the time comes Ø China has become much more open to international collaborations in the last years First International Cep. C Institutional board during the Cep. C workshop in Beijing – November 2017 This workshop!!! v I hope this workshop will be useful to the people of Cep. C and all enthusiasts of e+e- colliders Cep. C workshop, Rome, May 2018 18 F. Bedeschi, INFN-Pisa