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Study of Higgs boson production in bosonic decay channels at the LHC (including off-shell production) Susumu Oda Kyushu University On behalf of the ATLAS.

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Presentation on theme: "Study of Higgs boson production in bosonic decay channels at the LHC (including off-shell production) Susumu Oda Kyushu University On behalf of the ATLAS."— Presentation transcript:

1 Study of Higgs boson production in bosonic decay channels at the LHC (including off-shell production) Susumu Oda Kyushu University On behalf of the ATLAS and CMS Collaborations 2015-06-03 Blois2015: 27th Rencontres de Blois on “Particle Physics and Cosmology” 1/21

2 Introduction Higgs boson was the last undiscovered particle in the Standard Model of particle physics. Couplings to the scalar (J P =0 + ) Higgs field determine the particle masses. ©Wikipedia 2/21

3 Production Gluon fusion (ggF) is the dominant production channel of the Standard Model Higgs boson at the LHC. Fermionic production (production via top quark loop) Vector boson fusion (VBF or qqH) and vector boson associated production (VH, WH and ZH) Bosonic production 3/21

4 Decay 4/21

5 H   (1/3) Decay via loops of W boson and top quark Sensitive to new phenomena Event topology can be fully reconstructed. Adequate to study production mechanism by categorization Very good mass resolution ATLAS  =1.32—1.86 GeV  =1.05—2.62 GeV 5/21

6 H   (2/3) 6/21

7 H   (3/3) Correlation between fermionic production and bosonic production is studied. ATLAS: ggF vs VBF, VH, ttH CMS: ggF+ttH vs VBF+VH CMS 7/21

8 HZHZ Sensitive to new phenomena because of decay via loops. No excess above SM backgrounds ATLAS:  <11 (9) obs. (exp.) (95% C.L.) m H =125.5 GeV CMS:  <9.5 (10) obs. (exp.) (95% C.L.) m H =125 GeV 8/21

9 H  ZZ*  4l (1/4) Clean final state Event topology can be fully reconstructed. Small branching fraction On-shell Higgs signal is clearly seen at m 4l ~125 GeV. SignalBackground 9/21

10 H  ZZ*  4l (2/4) 10/21

11 H  ZZ*  4l (3/4) Events are categorized using event topology and discriminants to distinguish production channels. ATLAS: BDT VBF is used for VBF category CMS: p T 4l for 0/1-jet category and D jet for dijet category 11/21

12 H  ZZ*  4l (4/4) 12/21

13 Fiducial and total cross sections 13/21

14 Differential cross section (1/2) p T H distributions are compared. Mean p T H Combined data: 40.1 +/- 3.0 GeV HRES, NNLOPS, MG5_aMC@NLO and SHERPA 2.1.1: 34—37 GeV 14/21

15 Differential cross section (2/2) N jets distributions are compared. H   and H  ZZ*  4l data agree. Combined data have higher cross sections than predictions (NNLOPS, MG_aMC@NLO and SHERPA 2.1.1). 15/21

16 H  WW*  l l (1/3) Large branching fraction VBF and VH productions can be studied. (purely bosonic channels) Large missing E T by two neutrinos W bosons from the decay of a scalar particle and the V-A structure of the W boson decay lead to a small opening angle of two leptons. Discriminating variables: m T, m ll,  R ll,  ll ATLAS 16/21

17 H  WW*  l l (2/3) 4 categories are used in CMS. 0/1-jet ggF tag, 2-jets VBF tag, 2-jets VH tag, 3-leptons WH tag Either template fit or counting is used to extract signals depending on categories. 17/21

18 H  WW*  l l (3/3) 18/21

19 Off-shell production (1/2) Off-shell production cross section through gluon fusion does NOT depend on the total Higgs boson decay width,  H, unlike on-shell production. On-shell production is known to be close to the SM. Off-shell production can be used to constrain the total width  H. gg  H  VV (Signal)gg  VV (Background) 19/21

20 Off-shell production (2/2) Large qq  VV background 95% C.L. upper limits ATLAS  off-shell <5.1—8.6  H /  H SM <4.5—7.5 Depending on K-factor of gg  VV background CMS  H /  H SM <5.4 20/21

21 Conclusions Bosonic decay channels ( , Z , ZZ* and WW*) of the Higgs boson are excellent tools for Higgs physics at the LHC. Observed signal strengths are almost consistent with unity of the Standard Model expectation.  and ZZ* decay channels provided interesting differential cross section data. WW* decay channel provided the evidence of vector boson fusion production. Off-shell production is used to constrain the total width of the Higgs boson. 21/21

22 Backup slides 22/21

23 ATLAS publications https://twiki.cern.ch/twiki/bin/view/AtlasPublic/HiggsPublicResults H->  Phys. Rev. D 90, 112015 (2014) arXiv:1408.7084 https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-08/ H->  fiducial cross section JHEP 09 (2014) 112 arXiv:1407.4222 https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-10/ H->ZZ Phys. Rev. D 91, 012006 (2015) arXiv:1408.5191 https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-21/ H->ZZ fiducial cross section Phys. Lett. B 738, 234-253 (2014) arXiv:1408.3226 https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-22/ H->WW arXiv:1412.2641 https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-13/ VH->VWW ATLAS-CONF-2015-005 https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2015-005/ Off-shell H->ZZ and WW arXiv:1503.01060 https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2014-10/ H->  and ZZ fiducial cross section arXiv:1504.05833 https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2014-11/ H->Z  Phys. Lett. B 732, 8-27 (2014) arXiv:1402.3051 https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-05/ 23/21

24 CMS publications https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsHIG H->  Eur. Phys. J. C 74, 3076 (2014) arXiv:1407.0558 https://twiki.cern.ch/twiki/bin/view/CMSPublic/Hig13001PubTWiki H->ZZ Phys. Rev. D 89, 092007 (2014) arXiv:1312.5353 https://twiki.cern.ch/twiki/bin/view/CMSPublic/Hig13002PubTWiki H->WW JHEP 01 (2014) 096 arXiv:1312.1129 https://twiki.cern.ch/twiki/bin/view/CMSPublic/Hig13023PubTWiki H->Z  Phys. Lett. B 726, 587-609 (2014) arXiv:1307.5515 https://twiki.cern.ch/twiki/bin/view/CMSPublic/Hig13006PubTWiki Off-shell Phys. Lett. B 736, 64-85 (2014) arXiv:1405.3455 https://twiki.cern.ch/twiki/bin/view/CMSPublic/Hig14002PubTWiki 24/21

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