b.mellado university of the witwatersrand on behalf of the lhec study group hep seminar, tsinghua...
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B.MelladoUniversity of the Witwatersrand
On behalf of the LHeC Study Group
HEP Seminar, Tsinghua University, 22/08/14
Exploration of the Higgs boson and the Physics case for the
Large Hadron Electron Collider
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CERN Referees
Published 600 pages conceptual design report (CDR) written by 150 authors from 60 Institutes.Reviewed by ECFA, NuPECC (long range plan), Referees invited by CERN. Published June 2012.
arXiv:1206.2913
arXiv:1211.4831 and 5102
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About 200 Experimentalists and Theorists from 76 InstitutesSupported by CERN, ECFA, NuPECC
http://cern.ch/lhec
Present LHeC Study group and CDR authors
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LHeC Physics Programme
Ultra high precision (detector, e-h redundancy) - new insight Maximum luminosity and much extended range - rare, new effects Deep relation to (HL-) LHC (precision+range) - complementarity
CDR, arXiv:1211.4831 and 5102http://cern.ch/lhec
Strong coupling 0.1%; Full unfolding of PDFs; Gluon: low x: saturation?, high x: HL LHC searches…
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M.Klein
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LHeC Collaboration arXiv:1211:5102, see also O.Bruening and M.Klein arXiv:1305.2090
After the Higgs discovery: LHeC 1033 34 Luminosity (parameters in parenthesis) Turn the LHeC into a Higgs factory
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Some LHeC Context Some LHeC Context
The LHeC is not the first proposal for TeV scale DIS, but it is the first with the potential for significantly higher luminosity than HERA …
… achievable with a new electronaccelerator at the LHC …
[JINST 1 (2006) P10001]
Considering x10 increase of lumi
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The LHeC Detector
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P. Kostka
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Particles of
interest
Pdfs are needed to calculate cross-sections at the LHC
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Physics and Range
Large xGluon
HiggsBoson
co MK
-four-momentum transfer squared
Bjorken
High PrecisionQCD &El.weakPhysics
RPV SUSY, LQSubstructure ?
Nuclear Structure
QGPlasma
High Density Matter
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LHeC Kinematics and the LHC
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Extension of parton density
measurements at the LHeC very
important for upgraded LHC
Luminosity
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d/u at large x
Lead motivation for a LHeC: pdfs at high x for discovery physics
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Gluon Density Distribution
Spectacular increase in the precision of gluon density function at high x. This is important for discovery physics at the LHC
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M.Klein
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Higgs Physics at the LHeC
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On July 4th reported 5σ. With the addition of WW a 6σ effect is reached and reported in the final paper.
Habemus novum BosonPhys.Lett. B716 (2012) 1-29
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Evidence for VBF and VH production modes given in terms of ratio w.r.t. ggF+ttH modes.
Observe > 4σ evidence.
ATLAS-CONF-2014-009
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Higgs at LHeC
It is remarkable that VBF diagrams were calculated for lepton nucleon collisions before for pp!
Consider feasibility for the following point:
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At LHC replacelepton lines by quark lines
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Higgs via VBFQualitative remarks
Unlike QCD partons that scale like 1/PT
2, here PT~sqrt(1-x)MW
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Due to the 1/x behavior of the Weak boson the outgoing parton energy (1-x)E is large forward jets
At high PT
Contribution from longitudinally polarized Weak Bosons is suppressed in favor of transversely polarized WB at high pT
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Higgs Decay Products
Scattered fermions
Central Jet Veto
Well-defined prediction of the SM. Kinematics of scattered quarks, very sensitive to new physics
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Introduction
We’ll come back to HH production later
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LHeC, a Higgs Factory M.Klein
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MC Samples in Hadron-level study
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U.Klein et al.
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U.Klein
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CDR analysis is being revisited by Tokyo/Liverpool
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Refining event selectionWork in progress
Masahiro Tanaka
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Masahiro TanakaResults being cross-checked
Work in progressNeed to add photoproduction of ttbar
Need more man power to develop more realistic detector simulation and to study other channels
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Spin/CP Quantum numbers
At some point the study of the signal strength is not sufficient to understand presence of new physics in Higgs couplings. Scrutiny of kinematics of scattered quarks is a unique window of opportunity to establish admixtures of BSM terms in the HVV coupling
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Need to investigate physics beyond the SM within the 0+ hypothesis with high precision
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S. Biswal, R. Godbole, B.M. and a S. Raychaudhuri Phys.Rev.Lett. 109 (2012) 261801
CP Structure of HVV Couplings
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Strong potential to exclude admixture of BSM physics in the HWW coupling
Very conservative systematics assumed
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Double Higgs Production with a 50 TeV Proton Beam
In the light of the FCC kick-off meeting, we are evaluating feasibility of double Higgs production with a 50 TeV beam. Electron-proton collisions offer the advantage of reduced QCD backgrounds and negligible pile-up with the possibility of using the 4b final state.
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Feynman rules for the interactions of the scalar boson with gauge bosons, fermions and self-interactions.
Exploring the feasibility of the HHH coupling via double-Higgs boson production
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HH and tHt in ep
Polarisation, max lumi, tuning cuts, bb and WW
decays may provide O(10%) precision - tentative
FCC-he unpolarisedCross section at 3.5 TeV:
total : 0.7 fbfiducial : 0.2 fbusing pt(b,j)>20 GeVΔR(j.b)>0.4η(j) <5η(b) < 3
NewTentative Studies
Require time for reliable result(detector, analysis, backgrounds..)
Bruce Mellado, Uta Klein, Masahiro Khuze et al
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Cross-sections for CC backgrounds in fb for Ee=60,120,150 GeV
Cross-sections for CC HH->4b (branching ratios included)For unpolarized electron beam
Results assume 70% b-tagging efficiency, 0.1 (0.01) fake rates for c (light) jets
Results promising at parton level, giving comparable signal and background cross-sections even before topological requirements. Looking forward to the particle-level study.
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This is a important discriminator to distinguish EW from QCD multi-jet production
Scattered quark is more forward in signal
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Lagrangian with generic HHH coupling. Implementing into Feynrules with MG5
M.Kumar, R.Islam
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A photon-photon collider can be associated to LHeC effort
MH=125 GeV
Strong potential to measure CP mixing and violation thanks to control over photon polarization
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M.Klein
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M.Klein
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Outlook and ConclusionsLHeC displays strong complementarities with the LHC/e+e- with regards to Higgs physics
Forward jet tagging secures the feasibility of the Higgs search in CC and NC in ep collisions
With the isolation of the Hbb signal at the LHeC a window of opportunity opens for the exploration of the CP properties of the HWW and HZZ vertexesThe latter is a unique feature of the ep collider absent in pp/e+e- collisions
Exploring high lumi scenarios Higgs factoryThe LHeC removes the PDF/QCD uncertainties for pp: LHeC becomes precision Higgs facility
Exploring double Higgs production in the contex of FCC. Promissing results at parton level to be evaluated at hadron level 43
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Extra Slides
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• Previously considered as `QCD explorer’ (also THERA)
• Main advantages: low interference with LHC, high Ee ( 150 GeV?) andlepton polarisation
• Somewhat lower luminosity at reasonable power, no previous experience exists
• First considered (as LEPxLHC)in 1984 ECFA workshop
• Main advantage: high peaklumi obtainable (~2.1033 cm-2 s-1)
• Main difficulties: building round existing LHC, e beam energy (60GeV?) and lifetimelimited by synchrotron radiation
LINAC-RING
RING-RING
How Could ep be Done using LHC?How Could ep be Done using LHC?
… whilst allowing simultaneous ep and pp running …
Preferred Option
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Expect 5000 H bb events at 60 GeV for 1ab-1 0.7% coupling measurement at S/B ~1.
LHeC is high precision Higgs facility
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Signal Efficiency for Different Ee
First row: Cumulative efficiencySecond row: Efficiency w.r.t. previous cut
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Effect of Jet Energy Resolution
51Charge Current Analysis (results)
Nominal
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Effect of Range of b-tagging
52Charge Current Analysis (results)
Nominal
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Effect of Jet PT
53Charge Current Analysis (results)
Nominal
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Signal Efficiency for Different Ee
First row: Cumulative efficiencySecond row: Efficiency w.r.t. previous cut
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Need to investigate physics beyond the SM within the 0+ hypothesis with high precision
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Study in pp collisions
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Effect of PDF uncertainties and pdf choice
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Circularly polarized laser
Linearly polarized laserM.Velasco
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Only Only with with CC
Only Only with with CC
== 0 if CP is conserved
In s-channel production of Higgs:
== +1 (-1) for CP is conserved forA CP-Even (CP-Odd) Higgs
If A1≠0, A2≠0 and/or |A3| < 1, the Higgs is a mixture of CP-Even and CP-Odd states
Possible to search for CP violation in gg H fermions without having to measure their polarization
In bb, a ≤1% asymmetry can be measure with 100 fb-1
that is, in 1/2 years arXiv:0705.1089v2
M.Velasco
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Kinematic Distributions (Ee = 60 GeV)
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Despite large beam energy imbalance, jets are relatively central