Physics at LHC

Physics at LHC – Israeli
contributions
S. Tarem
RECFA meeting, Tel Aviv
10.4.2014
SM Higgs
Statistical methods for hypothesis testing Eilam Gross w O, Vitellis
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Eur. Phys. J. C 71, 1554 (2011)
Eur. Phys. J. C 70, 525 (2010)
Phys. Rev. D 81, 055010
Eilam Gross: Editor of Higgs discovery paper in role as Higgs convener
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Observation of a new particle in the search for the Standard Model Higgs
boson with the ATLAS detector at the LHC Phys. Lett. B 716 (2012)
H  4l VBF, Yoram Rozen, Eitan Gozani (PhD), Alessandro Di Mattia
(postdoc)
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Measurements of Higgs boson production
and couplings in diboson final states with
the ATLAS detector at the LHC,
Phys. Lett. B 726, 88 (2013)
SM Higgs, ttH, H   with both  decay hadronically, one top
hadronic and the other to lepton. E.Gross with Michael Pitt (PhD) and
Jana Schaarschmidt (postdoc) – in progress
BSM Higgs
Search for neutral MSSM Higgs bosons decaying to τ+τ− pairs :
Eilam Gross w Michael Pitt –
Physics Letters B 705, 174 (2011)
Charged Higgs search:
Eilam Gross with Liron Barak (PhD), Yoram Rozen with Silvia
Behar (finished PhD).
JHEP 1206, 039 (2012)
Eilam Gross with Liron Barak, Jana Schaarschmidt
• Heavy charged higgs decaying to top+bottom – in progress
Shikma Bressler, Avital Dery, Aielet Efrati
• Lepton flavor violating Higgs decays
– in progress
Studies for high luminosity
• Physics at a High-Luminosity LHC with ATLAS ATL-PHYS-PUB2012-001
• Beyond-the-Standard-Model Higgs boson searches at a HighLuminosity LHC with ATLAS ATLAS-PHYS-PUB-2013-016
• Liron Barak - WI
SUSY – long lived charged particles
Shlomit Tarem with S. Bressler, E. Kajomovitz (both graduated), Elisa
Musto (postdoc), Revital Kopeliansky (PhD)
• Search for long-lived charged particles (stau, R-hadrons, charginos)
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Phys. Lett. B 720, 277 (2013). (2011 data)
Phys. Lett. B 703, 428 (2011). (2010 data)
Eur.Phys.J.C62:281-292 (2009). (methods)
Paper on 2012 data in progress, preliminary
ATLAS-CONF-2013-058
A method for fast LLP search
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When a Muon Is Not a Muon, Detecting Fast Long-Lived Charged Particles from
Cascade Decays Using a Mass Scan, I. Galon, Y. Shadmi, S. Tarboush and S. Tarem,
Journal of High Energy Physics, 5 (2012), 136, arXiv:1112.4486 [hep-ph]
Long-lived neutral particle
Avner Soffer with Nimrod Taiblum (PhD) and Arik Kreisel
(postdoc, now staff at Soreq) - TAU
• Searches for long-lived particles: 2 papers with muon +
displaced vertex, working on 3rd paper (adding new channels)
– Phys.Lett. B719 (2013) 280 (2010 data)
– Phys.Lett. B707 (2012) 478
(2011 data)
Non LLP SUSY
• Search for new phenomena in final states with large jet
multiplicities and missing transverse momentum – Ehud
Duchovni, Itamar Roth - WI (PhD), JHEP 11 (2011) 099
• Search for supersymmetry in events with photons, bottom
quarks, and missing transverse momentum – Ehud Duchovni,
Ofir Gabizon (finished PhD, now postdoc) - WI, Phys.Lett. B
719 (2013) 261-279
Search for Exotics Physics (TAU)
• Team: Erez Etzion, Gideon Bella
• Postdoc: Merlin Davies
• Recently graduated: Noam Hod, Yiftah Silver, Yonathan
Munwes
• Graduate students: Nir Amram, Avi Gershon, Adi Ashkenazi,
Gidi Littwin
Search for dijet resonance
• Dijet resonance - A. Ashkenazi, G. Littwin, M.
Davies, G. Bella, E. Etzion – TAU
• Trigger Level Analysis for Dijets Mass
Resonance Search - G. Littwin, E. Etzion, C.
Doglioni, M. Davies, G. Bella, A. Ashkenazi
• Dijets Angular Distribution
– Complementary for to mass resonance
search, to account for wide resonances
or high tail
Search for heavy resonances
• Search for heavy resonances: di-muons - N. Hod, Y. Urkovsky,
Y. Silver, Y. Oz, G. Bella, E. Etzion – TAU
• Dileptons->Zkk - In collaboration with TAU Theorists
– JHEP 1211 (2012) 138
• Search for WZ resonance in 3l channel - M. Davies – TAU
– ATLAS-CONF-2014-015 (soon to be published)
• Search for top antitop resonances - A. Gershon, G. Bella, E.
Etzion - TAU
combine resolved and boosted selection
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Exotics: Dark Matter search
• Yoram Rozen, Eitan Gozani (PhD), Sandro Di Mattia, Henso
Abreu (postdocs) -Technion
• DM candidate may come from or in association with heavy
quarks. Search for DM by looking for large MET in tt-bar
environment (high jet multiplicity) and in association with a
single b jet (low jet multiplicity)
QCD
• J/ψ cross section and polarization - N. Amram, Y. Munwes, G.
Bella, E. Etzion – TAU
• Extracting the signal of double parton scattering in four-jet
events (7TeV, 2010) – Halina Abramovitz, Orel Gueta (PhD) TAU
Heavy ion physics - Weizmann
People:
• Sasha Milov
• Zvi Citron
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PI
Post-doc
Short term visitors
Petr Balek
Charles U. visiting student
Thomas Balstri
Stony Brook U. visiting student
Evgeny Shulga
MEPhI. visiting student
• Direct collaborators
• Alexei Antonov
MEPhI. Joint analysis
• Natalia Korotkova Moscow State U. Joint analysis
Z and W
Z – with Zvi Citron
• Goals: Initial state of collisions, Jet energy loss by jet tagging
• Signature: W and Z bosons produced in hard interaction
processes and immediately decay into a pair of leptons.
Leptons leave hot medium without interacting with it, and
provide direct insight on initial state of Heavy Ion collisions.
– Z in PbPb published
Phys. Rev. Lett 110, 022301 (2013)
– Z+jet in PbPb preliminary ATLAS-CONF-2012-119
– Z in pPb
work in progress
W – with Thomas Balestri, Zvi Citron
– W in PbPb
work in progress
More HI
dNch/d in pPb - Natalia Korotkova, Alexei Antonov and Sasha
Milov
• Goals: Study of soft particle production, Understanding
centrality behavior.
• Signature: charged tracks down to very at low pT. Centrality
behavior is very interesting in asymmetric collisions. Test for
centrality determination in pPb (first time)
– ATLAS-CONF-2013-096
Hadron spectra:
• Goals: Charged hadron suppression at high pT. Initial state
effects.
• PbPb Petr Balek and Sasha Milov
– ATLAS-CONF-2012-120
• pPb Evgeny Shulga and Sasha Milov
– ATLAS-CONF-2013-107