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C. Clément

Historically crucial to persevere on problems which resists the big picture Prioritise experimental facts as a motivation for the BSM searches 1- Dark matter Well anchored in observations Best fit is a WIMP in 1-1000 GeV Does not fit into SM

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C. Clément

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  1. Historically crucial to persevere on problems which resists the big picture • Prioritise experimental facts as a motivation for the BSM searches • 1- Dark matter • Well anchored in observations • Best fit is a WIMP in 1-1000 GeV • Does not fit into SM • Cannot be explained even by a fine tuning of SM • 2- Neutrino masses • Are non-zero, not generated by Higgs mechanism • If the Seesaw mechanism explains the mass of the neutrinos then can expect: • Heavy neutrinos at LHC or right-handed W, Z bosons, neutrinoless double β decay. • 3- Hierarchy problem • Builds on somewhat subjective theory concept of naturalness • Can be fine tuned away • Boosted by the fact that theories addressing this problem often have more to offer • Cannot ignore the fact that problems 1,3 can be solved with the same general • ingredients. 2- could also solve 1- … Future Group Strategy 2013-10-08 C. Clément 1

  2. Historically crucial to persevere on problems which resists the big picture • Prioritise experimental facts as a motivation for the BSM searches • 1- Dark matter • Well anchored in observations • Best fit is a WIMP in 1-1000 GeV • Does not fit into SM • Cannot be explained even by a fine tuning of SM • 2- Neutrino masses • Are non-zero, not generated by Higgs mechanism • If the Seesaw mechanism explains the mass of the neutrinos then can expect: • Heavy neutrinos at LHC or right-handed W, Z bosons, neutrinoless double β decay. • 3- Hierarchy problem • Builds on somewhat subjective theory concept of naturalness • Can be fine tuned away • Boosted by the fact that theories addressing this problem often have more to offer • Cannot ignore the fact that problems 1,3 can be solved with the same general • ingredients. 2- could also solve 1- … Future Group Strategy 2013-10-08 C. Clément 2

  3. Historically crucial to persevere on problems which resists the big picture • Prioritise experimental facts as a motivation for the BSM searches • 1- Dark matter • Well anchored in observations • Best fit is a WIMP in 1-1000 GeV • Does not fit into SM • Cannot be explained even by a fine tuning of SM • 2- Neutrino masses • Are non-zero, not generated by Higgs mechanism • If the Seesaw mechanism explains the mass of the neutrinos then can expect: • Heavy neutrinos at LHC or right-handed W, Z bosons, neutrinoless double β decay. • 3- Hierarchy problem • Builds on somewhat subjective theory concept of naturalness • Can be fine tuned away • Boosted by the fact that theories addressing this problem often have more to offer • Cannot ignore the fact that problems 1,3 can be solved with the same general • ingredients. 2- could also solve 1- … Future Group Strategy 2013-10-08 C. Clément 3

  4. 1- Dark matter • 2- Neutrino masses • 3- Hierarchy problem • ATLAS and LHC allow us to look into these problems and more • Directly via production of new particles • Indirectly via loop diagrams, access several order of magnitudes above TeV scale. not a prioritized order! Allows to investigate a very large spectrum of physics problems Future Group Strategy 2013-10-08 C. Clément 4

  5. mono jet analysis 5 fb-1 Difficult region for direct dark matter searches Future Group Strategy 2013-10-08 C. Clément 5

  6. Limit from future direct DM experiments ATLAS 5fb-1 Future Group Strategy 2013-10-08 C. Clément 6

  7. Limit from future direct DM experiments ATLAS 5fb-1 • ATLAS and LHC • - sensitive to WIMP production between 1 and >1 TeV • offer the most performant tool to look for WIMP production at low mass • unique possibility to measure quantum numbers Future Group Strategy 2013-10-08 C. Clément 7

  8. 1- Dark matter 2- Neutrino masses 3- Hierarchy problem Whether one wants to work with any of the problems there are plots showing ATLAS sensitivity. Future Group Strategy 2013-10-08 C. Clément 8

  9. Missing energy resolution degrades by a large factor at high pileup. • Can we as a group contribute to the phase-II upgrade to improve performance • in high lumi environment? • L1Calo and TileCal are crucial to many analysis, for • ETmiss • high pT jets • isolation of electrons and photons Future Group Strategy 2013-10-08 C. Clément 9

  10. Motivate the hardware work with the type of physics we want to do in phase-II We know that landscape can evolve so we can adapt when data really comes Now going to show an example around a physics case . Future Group Strategy 2013-10-08 C. Clément 10

  11. Tile Calorimeter crucial to measure the high MET and jets pT > 150 - 500 GeV in the WIMP search. Can we develop new handles to mitigate pile-up in TileCal? • With 25ns pile-up much worse • Not just two but more pulses in time frame. • Eg. higher sampling frequency, narrower pulses,… 50 ns pile-up Future Group Strategy 2013-10-08 C. Clément 11

  12. 1. ATLAS WIMP search in medium luminosity environment with 2015 – 2019 data Use as testbench for high pile-up technique, simulation studies Combination of multiple channels mono W/Z, mono-jet, mono-γ 2. Simulations for optimisation of the tile calorimeter electronics. Sampling frequency, shaping parameters, ADC accuracy. Electronic simulation  Electronic performance Pile-up simulation  How far can we go in pile-up discrimination. 3. Develop and construct the second and following TileCal demonstrators. Daughter and mother boards. 4. Develop the algorithms that exploit the new electronics. Exploitation of additional samplings baseline subtraction in the RODs In-time pile-up / Left-Right PMT and GEANT simulations. Future Group Strategy 2013-10-08 C. Clément 12

  13. Future Group Strategy 2013-10-08 C. Clément 13

  14. Other possible tracks I find interesting Upgradable Higgs factory which would operate before I retire Neutrino physics Darwin Neutrino mass hierarchy But We should be careful to divert efforts to non-collider efforts, there are already many non-collider projects at SU and in Sweden, but few in collider PP. Future Group Strategy 2013-10-08 C. Clément 14

  15. Conclusions Collider PP is central and still to my mind the best approach to multiple problems. We are heavy on analysis now, it is good, but if we consider ATLAS OT and UPGRADE we are actually running thin, with limited # of seniors to ensure all this happens. There is only a limited number of options to maintain collider particle physics in Sweden. For these reasons, I think the priority should be upgraded LHC. If the linear collider in Japan happens need to be seriously considered (if we can get money for that). Future Group Strategy 2013-10-08 C. Clément 15

  16. mono W/Z analysis 20 fb-1 • ATLAS and LHC • - sensitive to WIMP production between 1 and >1 TeV • offer the most performant tool to look for WIMP production at low mass • unique possibility to measure quantum numbers Future Group Strategy 2013-10-08 C. Clément 16

  17. 1. Developing the ATLAS WIMP search in a medium luminosity environment based on the 2015 – 2019 ATLAS data New data, analyses improvements with medium pile-up Use as testbench for high pile-up technique, simulation studies Combination of multiple channels mono W/Z, mono-jet, mono-γ 2. Simulations for optimisation of the tile calorimeter electronics. Sampling frequency, shaping parameters, ADC accuracy. Electronic simulation  Electronic performance Pile-up simulation (tool developed by Pawel / Simon)  How far can we go in pile-up discrimination. 3. Develop and construct the second and following TileCal demonstrators. Depending on the type of development proposed, develop not only the daughter boards but also the mother boards. 4. Develop the algorithms that exploit the new electronics. Exploitation of additional samplings baseline subtraction in the RODs In-time pile-up / Left-Right PMT and GEANT simulations. Future Group Strategy 2013-10-08 C. Clément 17

  18. Physics strategy High Energy Frontier: LHC-upgrade and e+e- colliders. Discuss two scenarios for • if new signatures found at LHC running at 13/14 TeV and • if nothing new is found. C. Clément & J. Rathsman Uppsala 2013-01-16 Physics Strategy 18

  19. ILC, CLIC, LEP3, HL-LHC, HE-LHC, LHeC ? ~14 TeV LS2 14 TeV 27 2015 19 31 23 25 21 17 29 33 ~25 fb-1 ~90 fb-1 ~300 fb-1 • Why do we need to discuss such a long time scale ? • 1990 => 18 years to LHC • LEP is in full steam • LEP stop is 10 years away • LHC discussions 1990 Aachen First beam in LHC 2008 • Situation not dissimilar fro 1990 • If we do not take the HL-LHC for granted … Uppsala 2013-01-16 Physics Strategy 19

  20. CLIC • Finalise parameters • Construct. stage 1 (500 GeV) • CLIC Run LEP3 • R&D, TDR • Install • LEP 3 Run HE-LHC HE-LHC Run HE-LHC R&D, industrialisation, … installation ILC ILC design, construction, installation ILC Run LHC • ~14 TeV • ~14 TeV • HL-LHC • LS2 • LS3 2015 2017 2024 2030 2021 2035 HE- LHC, ILC and CLIC: important decisions need to be taken around O(2016) if these time scales are be realistic.

  21. Observation To get experimental HEP data from a collider in the 2020’s there are only two options HL-LHC LEP3 About LEP3 “the earliest installation of LEP3 is during LS3 2022/23 or more probably around 2025” HL-LHC schedule could also slip Uppsala 2013-01-16 Physics Strategy 22

  22. Arguments in favour of HL-LHC • Relies heavily on the existing LHC infrastructure • Only option that is feasible in the first half of the 2020’s • Very promising Higgs physics program • Serious potential for new physics beyond design LHC Can come very close to kill eg. SUSY if no stop quarks below 1 TeV Drawback difficult very high luminosity environment 200-400 simutaneous collisions Projections for HL-LHC Uppsala 2013-01-16 Physics Strategy 23

  23. Arguments in favour of HL-LHC • Relies heavily on the existing LHC infrastructure • Only option that is feasible in the first half of the 2020’s • Very promising Higgs physics program • Serious potential for new physics beyond design LHC Can come very close to kill eg. SUSY if no stop quarks below 1 TeV Very difficult at (HL/HE)-LHC Could be addressed only by a linear collider e+e- with c-o-m > 2 TeV (CLIC) Projections for HL-LHC Uppsala 2013-01-16 Physics Strategy 24

  24. Some private thoughts about LEP3 240 GeV center of mass Essentially focused on Higgs Without further upgrade LEP3 has limited potential for direct BSM searches Upgrade means constructing a larger circular tunne A 80km tunnel would allow √s=350 GeV LEP3 guesstimate Assuming approximately here that LEP3 would allow us to go up to the kinematic limit. LEP2 Uppsala 2013-01-16 Physics Strategy 25

  25. If new signatures found at LHC running at 13/14 TeV ( <2021 ) Will want to operate LHC longer to measure new states properties! HL-LHC Can be done as the same time that the Higgs properties are detailed further. e+e- could provide cleaner environment to study the new states, eg. spin, detailed couplings. If the mass of the new particle(s) is above ~120 GeV (if pair produced) will Not be able to study them at LEP3 Pair produced particles with m>~120 GeV will require ILC or CLIC. If mass > 500 GeV requires, can only be addressed by CLIC ILC allows to cover up to 500 GeV for pair produced particles Can be operating sooner at the Higgs production threshold than CLIC The fact that ILC should be upgradable beyond Higgs production is crucial otherwise little difference with LEP3. Some developments could also allow CLIC to operate at Higgs production threshold. Uppsala 2013-01-16 Physics Strategy 26

  26. If nothing new is found at LHC up to 2021 Study the Higgs properties HL-LHC, LEP3, ILC or CLIC ALSO Need to push further the energy envelope, eg. SUSY / stop not killed by design LHC. HL-LHC would allow to push further the mass limits. Highly complementary with a high c-o-m e+e- LC. e+e- collider would anyway be necessary to close the window on several BSM theories and provide Higgs precision measurements. precision measurements Uppsala 2013-01-16 Physics Strategy 27

  27. Some complementary material Uppsala 2013-01-16 Physics Strategy 28

  28. Frank  Zimmermann,  CERN (2012) https://indico.cern.ch/abstractDisplay.py/getAttachedFile?abstractId=157&resId=0&confId=175067 Uppsala 2013-01-16 Physics Strategy 29

  29. S.  Yamashita,    Higgs  at  future  linear  collider,  In  Sitges  1999,  Physics  and  experiments  with   future  linear  e+  e-­‐  colliders,  vol.  1. Uppsala 2013-01-16 Physics Strategy 30

  30. Example sensitivity to the lightest stop quark at L=500fb-1 and √s=500 GeV Can come close to mstop~√s/2 and DeltaM=5 GeV http://arxiv.org/abs/hep-ph/0508154 Uppsala 2013-01-16 Physics Strategy 31

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