1. Future Colliders Gordon Watts University of Washington/Seattle APS NW Meeting May 12-14, 2016

2. G. Watts (UW/Seattle) 2

3. 3 a e f i j kl o r s v x Any new theory will have to… Add new particles Add interactions between the particles and the Standard Model Particles We can: Search for the new particles Search for evidence of the interactions

4. G. Watts (UW/Seattle) 4 We can: Search for the new particles Search for evidence of the interactions An example of large number of ATLAS analyses Reporting on searches for various exotic particles

5. G. Watts (UW/Seattle) 5

6. 6 We can: Search for the new particles Search for evidence of the interactions This is the energy frontier that the P5 report talks about Normally this requires a new facility!

7. G. Watts (UW/Seattle) 7 We can: Search for the new particles Search for evidence of the interactions From the Combined ATLAS and CMS Higgs coupling paper

8. G. Watts (UW/Seattle) 8 Sensitive to loop corrections of much more massive particles

9. G. Watts (UW/Seattle) 9 We can: Search for the new particles Search for evidence of the interactions Reducing the error bars requires statistics. Reducing the error bars requires cleaner events. Hadron vs Lepton collider, high intensity vs low intensity.

10. G. Watts (UW/Seattle) 10 A high intensity B physics machine Asymmetric collider: produces large sample of clean B meson decays Precision study of the flavor sector (Bottom and some Charm)

11. G. Watts (UW/Seattle) 11 x50 increase in luminosity and collected data over KEKB/Belle by 2020 Commissioning… Goal:

12. G. Watts (UW/Seattle) 12 The LHC is a hadron machine This will increase search mass reach Mostly this is a statistics increase Fully exploiting existing resources

13. G. Watts (UW/Seattle) 13 Long history - What interacts? One of the quarks Anything in the sea The Electron Higher Energy Rich set of initial partons Clean Backgrounds Specific Kinematics

14. G. Watts (UW/Seattle) 14 Energy Thresholds ZH and WH production Two technologies to accomplish these energies v.s.

15. G. Watts (UW/Seattle) 15 Circular Electron-Positron Collider Like LEP Energy to 250 GeV Further increases are difficult! Goal:Detailed study of Higgs couplings (decade of running) 55 km ring

16. G. Watts (UW/Seattle) 16 The International Linear Collider Most likely site: Japan Energy is a function of length Site dependent! Avoid limitations of the circular ring Beam Polarization

17. G. Watts (UW/Seattle) 17

18. G. Watts (UW/Seattle) 18 More limited in energy Designed to look at Higgs couplings Greater energy possibilities Look at a new particle spectra? When to build what? When will we know that!? e.g. If the 750 GeV bump was real, it could drastically change the motivations for these accelerators

19. G. Watts (UW/Seattle) 19 Built in same tunnel as the CEPC This is a discovery machine! A discussion of a 100 TeV collider has been on going for years (VLHC) (see archive!) This is used as a discussion point for the planning in China currently High field magnets Tunnel size Detector design (e.g. Multiple Interactions) Synchrotron Radiation!!!!!!!!!! Low priority…

20. G. Watts (UW/Seattle) 20 20102020 2030 2040 LHC HL-LHC SuperKEKB SppC 2050 CEPC ILC ?? I have ignored several colliders (BES, Fermi, Muon, photon, etc.) There are non-collider studies in progress The problem with predictions…