ECFA – Physics Goals … group 2 nd meeting

1. ECFA – Physics Goals … group2nd meeting Chris, Gavin and Leandro May 31st

2. Some notes from last SC meeting • We're expected to give a 30' talk (+10' discussion) covering: • Proposed agenda of our session at the October Workshop • Detailed outline of the presentations • Status of availability of the required material • Next steps • We think that our report has been well received. Based on the feedback we got, most likely we should have in our Session four central talks: 1) Higgs physics, 2) BSM searches 3) Heavy Flavourand 4) Heavy Ions. • Probably we want to cover Vector Boson Scattering in 1) • It has been suggest to consider a specific talk on requirement from physics to detector and trigger. This could be an additional important talk • All points covered by this bulleted item are meant to be *starting ideas* for next PG1 meeting (date/time to be decided). • One question we got is on HI: it would be good to know from HI colleagues and idea on how much p-p collision reference data is needed • Last but not least: interconnect/merge the “Theory” and “Physics Goals…” sessions

3. Proposed Agenda & “Theory & Physics Goals…” session [for discussion] • Introduction – 15’ • Higgs boson precision measurements and VBS 40’ • New Physics searches: SUSY, ExtraDimensions, etc; 40’ • Requirements to Trigger, Detector and Physics objects performance 30’ • Heavy Flavour [LHCb speaker] 25’ • Heavy Ion [ALICE speaker] 25’ • Theory considerations relevant for HL-LHC are presented in each talk (except 4) • The Introduction is a talk that presents the structure of the session and gives the main message on the physics case for HL-LHC

4. Detailed outline of the presentations • We should start discussing this today • Probably we should give at least the main points that we want to cover in each talk

5. Higgs & VBS: an example • Higgs couplings • Includes SM measurements to reduce theory uncerainty, egconstrain PDFs • includes rare decays • Higgs selfcoupling • Higgs spin and CP • VBS: sensitivity studies to detect non-SM contribution from VV invariant mass analysis • Example: VBS WW  lnlnqq

6. BSM searches: an example • Third generation squark searches • Electroweak gaugino searches • (Squark and gluino searches) • Heavy resonance decays to ttbar, leptons, … (Discuss with Andreas Weiler)

7. Heavy Flavour talk (1) • Propose a talk on HF physics for ECFA workshop • Suggest an LHCb speaker for this contribution • Cover not only b, c & τ, but also t FCNC decays and lepton flavour violation • Emphasize synergies between LHCb & GPDs • Focus on HL-LHC era i.e. post-LS3 – recall LHCb upgrade starts post-LS2 • Not useful to discuss in terms of Lint • 1/fb @ LHCb 1/fb ≠ @ ATLAS/CMS • Instead consider calendar year, or LHC run period, with certain assumptions • Material for LHCb upgrade available at CERN-LHCC-2011-001 and arXiv:1208.3355 – update for w/s based on latest information

8. Heavy Flavourtalk (2) • Consider performance vs. time for (for example) • B(B0→μ+μ–)/B(Bs0→μ+μ–) LHCb, ATLAS & CMS • Precision SM and MFV test • φs(Bs0→φφ)LHCb • Search for NP causing CPV in loops • CKM angle γLHCb (Belle2) • Crucial input for precision CKM fits • AΓ (D0→K+K– & π+π–)LHCb (Belle2) • Search for CPV in charm mixing – SM null test • τ→μμμLHCb (Belle2, ATLAS & CMS?) • Lepton flavour violation • t→cγ, cμμ & ceeATLAS & CMS • FCNC top decays – SM null test

9. Heavy Ions • Propose a talk on HI physics plans and goals for RUN3 • Suggest an ALICE speaker for such a report • Also in this case, encourage synergy between ALICE and ATLAS+CMS • Main items in the proposed report: • (very) Low pT Heavy Flavor, charmonium production (mainly ALICE) • Heavy quark diffusion in in QGP ( -> equation of state); heavy quark thermalization and in-medium hadronization • Important to measure precisely (few % level) the J/ψ and ψ’ production down to zero pT, and to perform this as a function of eta • Upsilon family production (ALICE, ATLAS and CMS) • (very) Low-mass dileptons (ALICE) • photons from QGP, γ to e+e-, map temperature during system evolution • Modification of ρ spectral function (ρ to e+e-) -> chiral symmetry restoration • Jet physics: fragmentation functions in QGP, flavor dependent (ALICE, ATLAS and CMS); high-pT production (mainly ATLAS and CMS)

10. Available material • The European Strategy documents submitted by ATLAS and CMS • The MC samples and the ES functions used by ATLAS • The system put in place by CMS for projecting current data/MC results to HL-LHC • The HI & HF studies submitted for European Strategy • ALICE/ATLAS/CMS/LHCb Upgrade documents ATLAS: • Useful info on trigger rates @ 7x1034 • Very useful information on ITK performance • Transverse momentum resolution as a function of (pT,eta) • Efficiencies as a function of fucntion of (pT,eta) with p.u. for muonspions and electrons • B-tagging with p.u. • Recent effort (ongoing) for Snowmass

11. Channels suggested for full simulation • HHbbgammagamma • Hμ+μ− • HZgamma • VBF H ττ • VB Scattering • a channel from BSM We should choose one/few of them (not all!)

12. some ideas on the “strategy” • Revisit European Strategy findings with what learnt in recent full simulation studies (eg Upgrade work) • Benefit from Snowmass preparation • We should focus to results with detector response close to ATLAS/CMS • Pay attention also to findings from more generic (and more optimistic?) simulations • Validate with full simulation the “smearing fucntions” used for ES (ATLAS) • Consider one (a few?) channels that we want to perform in full simulation • Study these also in fast simulation: it will be very important to know how results from fast simulation compare with those from full • Question: the same channel for ATLAS and CMS (improves robustness of the result) or two different channels (expand the physics output)?

13. appendix