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-- Main.TomRavenscroft - 2012-01-20

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---+ Summary Of ATLAS UK Work

This page summaries other ATLAS UK groups work in Higgs analysis, taken from web pages and also presentations made at the ATLAS UK meeting 2012.

---++ Alphabetical List of Groups

---+++ University of Birmingham
Involved in search for low mass Higgs in H -> bb searches from either W or Z bosons.

They presented work at ATLAS UK 2012 in conjuntion with Liverpool on seaches for Higgs in VH channel with V being either vector boson. The analysis was done in the three major channels: WH -> l<latex>\nu</latex>bb, ZH -> llbb and ZH -> <latex>\nu\nu</latex>.

They used the full 2011 data set. and identified major backgrounds in the data as: W/Z+jets, tops, QCD, diboson and high WH stats. 

Selection of the ojects wa split into groups for different criteria. For single elctrons they had to have pT > 25(20)GeV for W(Z -> ll), |<latex>\eta</latex>| < 2.47, a strack isolation of < 0.1 and <latex>\Delta</latex>R < 0.2. The impact parameter, d0 < 0.1mm. 

For single muons, the pT, track isolation, <latex>\Delta</latex>R and |<latex>\eta</latex>| < 2.47 was the same as for electrons but the impact parameters were z0 < 10mm and d0 <0.1(1)mm for W(Z -> ll).

There was no singnificat excess in any of the mentioned channels. The WH limits have not yet been completed but the yare expected to be comparable to the ZH limits, giving a combined VH (H -> bb) limit.

There is good MC data agreement and will publich an inclusive VH analysis contributing to the standard model Higgs combination.
[[http://www.ep.ph.bham.ac.uk/exp/ATLAS/][BirminghamATLAS]]

---+++ University of Edinburgh
Involved with search for the Higgs in WH (H -> bb) and H -> ZZ(*) -> 4l channels. Not much information on their website.

Heavily involved with working with UCL in a boosted Higgs analysis of WH and ZH presenting preliminary results at ATLAS UK 2012 meeting where they showed only the analysis for WH -> l<latex>\nu</latex>bb. (ZH analyses are still being developed). Although they are working closely together, UCL and Edinburgh have independent analysis codes. 

Working on a neural network approach in parallel to this an attempt to improve the sensitivity. Also planning a data-driven QCD.
[[http://www2.ph.ed.ac.uk/particle-physics-experiment/research/ATLAS/][EdinburghATLAS]]
---+++ University of Lancaster
Working on Higgs decays to leptons is all it says about Higgs searches. They have done work on B-physics, looking for new particles decaying in to top quarks and also J/ <latex>\Psi</latex> decays to understand triggers. [[http://www.hep.lancs.ac.uk/ATLAS/Atlas-1.html][LancasterATLAS]]
---+++ University of Liverpool
Liverpool is involved with a number of Higgs analyses in a number of channels: H -> ZZ( * ) -> 4l, H -> ZZ( * ) -> 2l2b, ZH -> 2l2b and H -> <latex>\tau\tau</latex>.

As stated higher up, presented work alongside Birmingham on  VH (H -> bb) decays. Liverpool also presented their work on H -> ZZ -> ll<latex>\nu\nu</latex>/llqq analysis.for a high mass Higgs candidate, allowing for the testing for many Higgs theories. Their search was done over the entire data set with backgrounds in Z/W+jets, Top, Diboson and QCD. They will publish a paper on the full 2011 analysis before extending the search up to a 600GeV candidate. Liverpool will continue theire H -> ZZ -> <latex>\nu\nu</latex>bb channel and set limits on the non-standard model Higgs. 
[[http://hep.ph.liv.ac.uk/atlas/Physics/Higgs.html][LiverpoolATLAS]]
---+++ University of Manchester
Nothing indepth at all, but does state they are working on charged Higgs searches in top decays. [[http://www.hep.man.ac.uk/atlas/][Manchester ATLAS]]
---+++ University of Oxford
H -> WW and H -> <latex> \tau\tau </latex> searches as well as beyond the standard model Higgs searches. No extra information. [[http://www.physics.ox.ac.uk/atlas/Group_Activities/Physics/higgs.aspx][OxfordATLAS]]
---+++ Queen Mary University of London (QMUL)
Studying Top quark production and mass as well as Higgs production in H -> WW channel. and any deviatoins from the standard model. [[http://pprc.qmul.ac.uk/research/atlas-group-qmul][QMUL_ATLAS]]
---+++ Rutherford Appleton Lab (RAL)
Involved with B-physics emphasising on triggering , W-physics on the W cross-section measurements, mass and decays. Higgs searches include ttH and H -> <latex>\gamma\gamma</latex>. [[http://www.stfc.ac.uk/PPD/22544.aspx][RAL_ATLAS]]
---+++ Royal Holloway University of London
Areas of Higgs study include ttH -> <latex>\gamma\gamma</latex> and ttH -> WW. Investigting the physics of inclusive and exclusive SUSY signatures as well as looking for exotic phenomena (extra dimensions) [[http://www.rhul.ac.uk/physics/research/particlephysics/experimentalparticlephysics/atlasphysicsstudies.aspx][RoyalHollowayATLAS]]
---+++ University of Sheffield

---+++ University of Sussex
Looking for evidence of neutralino by looking for large missing energies as well as other leptonic supersymmetric partners [[https://epp.phys.susx.ac.uk/epp/ATLAS][SussexATLAS]]
---+++ University College London (UCL)
Searching for the Higgs but does not say in which channels on their website. They have a contribution to the trigger and the recording of events. 

At the ATLAS UK meeting 2012, Edinburgh had a presentation on boosted Higgs analysis in conjuntion with UCL in WH and ZH. The Boosted Higgs analysis was well underway for Z -> bb at UCl with an expected constraint on WH/ZH systematics.
[[http://www.hep.ucl.ac.uk/atlas/][UCL_ATLAS]]
---++ Useful Links
Topic revision: r1 - 2012-01-20 - TomRavenscroft
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