清华大学：SUSY Higgs at the LHC plus a bit more

SUSY Higgs at the LHC plus a bit more Mike Bisset/毕楷杰 PHYSICS 2005 Tsinghua University Beijing,China “Linear Collider' conference 清大学 Tsinghua, July17,2005

“Linear Collider” conference Tsinghua, July 17, 2005 Mike Bisset / 毕楷杰 Tsinghua University Beijing, China plus a bit more

First consider something that is NOT supersymmetry MUED'S Minimal universal extra dimensions H.-C. Cheng, Matchev& Schmaltz hep-ph/0205314 All SM fields propagate in a single compactified extra dimension with compactification radius near the Tev scale E All SM particles have KK partners with similar couplings (lowest energy states in the Kaluza-Klein towers) E The lowest KK level particles carry a conserved quantum number KK-parity The lightest kK particle is the stable LKP The LKP is not detected, resulting in a missing energy signal Sounds a lot like the MSSM. no?

MUED’s Minimal universal extra dimensions All SM fields propagate in a single compactified extra dimension with compactification radius near the TeV scale All SM particles have KK partners with similar couplings The lowest KK level particles carry a conserved quantum number KK-parity The lightest KK particle is the stable LKP    The LKP is not detected, resulting in a missing energy signal. (lowest energy states in the Kaluza-Klein towers) Sounds a lot like the MSSM, no? First consider something that is supersymmetry --- H.-C. Cheng, Matchev & Schmaltz hep-ph/0205314

Distinctions between the mssm and MUED's O Sparticles have different spins from their SM partners while KK particles have the same spin This would certainly be testable at a LC, but at the epph0405052 ② There is no analog to the heavier MSSM Higgs bosons The KK partners to the Higgs carry KK-parity, and so should be pair produced (behaving more like Higgsinos than like Higgs bosons)

Distinctions between the MSSM and MUED’s  Sparticles have different spins from their SM partners while KK particles have the same spin This would certainly be testable at a LC, but at the LHC maybe not  There is no analog to the heavier MSSM Higgs bosons The KK partners to the Higgs carry KK-parity, and so should be pair produced (behaving more like Higgsinos than like Higgs bosons) Smillie & Webber hep-ph/0507171 limited attempts: Barr, hep-ph/0405052

So we see detection of the heavier MSSM Higgs bosons IS crucial Tor even being sure that we are seeing SUPERSYMMETRY

So we see detection of the heavier MSSM Higgs bosons is crucial for even being sure that we are seeing SUPERSYMMETRY

How well can we do at the lHc?

How well can we do at the LHC?

t→bH",H'→ ATLAS h→>yand ∫udt=300fb wh/tth.h→>yy Maximal mixing tth,h→bb H→tb ATLAS HA→T TDR →tH,H→ leptons LEP 2000 H→tb A→Zh→‖bb H/A→tt 50100150200250300350400450 DA (Gev) 3. 14: 5 discovery contours for MSSM Higgs boson detection in various channels

ATLAS TDR

40 →bH°,H'→Ty ATLAS ∫Ldt=300fb Wh /th. h ond Maxim h→b H 20 H→tb H/A 098 only detect h the decoupling regime A→Zh→‖bb H/A→t 5010015020025030035040450500 (Gev) 3.14: 5o discovery contours for MSSM Higgs boson detection in various channels

only detect h the

t→bH",H'→ ATLAS 40 ∫udt=300fb h→>yand wh/tth.h→>yy Maximal mixi tth,h→bb BUT depends on good detection capabilities A,H, H for bs and taus signals only detect LEP Il excluded 5010015020025030035040 DA (Gev) 3. 14: 5 discovery contours for MSSM Higgs boson detection in various channels

BUT depends on good detection capabilities for b’s and tau’s only detect h LEP II excluded A, H, H  signals

40 H.A→ muons Depends on good detection capabilities for b's and taus only detect -plated LEP Il excluded 5010015020025030035040 DA (Gev) 3. 14: 5 discovery contours for MSSM Higgs boson detection in various channels

Depends on good detection capabilities for b’s and tau’s only detect h H, A  muons Gold -plated signal LEP II excluded

阅清华大学 Tsinghua University BUT the preceding does not take into account possible Higgs boson decays into sparticles h.H.A→ x H On the bad side... decays to these channels reduce the rates of SM signal channels On the good side... new signals may be found

清华大学 Tsinghua University the preceding does not take into account possible Higgs boson decays into sparticles 0 0 * , , , , , i j i j h H A                     0 , H i  j           On the bad side… On the good side… decays to these channels reduce the rates of SM signal channels new signals may be found