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Agenda. ATLAS. DØ. n , p decay, DUSEL. Mariachi. The Stony Brook Group makeup – three NSF grants, two DOE tasks: Seen from within, the boundaries between grants are highly permeable. We are one unified HEP group.

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n, p decay, DUSEL



  • The Stony Brook Group makeup – three NSF grants, two DOE tasks: Seen from within, the boundaries between grants are highly permeable. We are one unified HEP group.

  • NSFa – DØ, Atlas, ILC (senior PIs Grannis, Engelmann, McCarthy, Schamberger)

  • NSFb – Mariachi (senior PI Marx)

  • NSFc – DUSEL (senior PIs Jung, Paul)

  • DOEa – DØ, Atlas (senior PIs Rijssenbeek, Hobbs)

  • DOEb – SuperK, K2K, T2K, UNO (senior PIs Jung, McGrew, Yanagisawa)

  • Shared resources: Elect. Engineer – Manzella (NSFa); Technician – Steffens (State, NSFa, NSFb, DOEa); Computing – Ng (State); Administration – Napolitano, Dugan (1/2 time) shared on all HEP and XRay grants.


Stony Brook Grant support (approximate yearly totals):

Current base grants:

NSFa $982K


NSFc $80K



ATLAS MoU support: ~$80K

K2K MoU suppport: ~$80K


Evolution of Stony Brook experiments



K2K – T2K

AGS Direct electrons






FNAL Dileptons/ dihadrons









Some notable Stony Brook physics achievements:

FNAL E605: Discovery of Upsilon (Upsilon’ and ’’)

CUSB: Upsilon 4S discovery, bottomonium spectroscopy

ISR: rising total pp and ppbar cross sections, high pTp0

AGS E650: anomalous high pT e- and e+e- production

DØ: top discovery, cross section & mass; W boson mass; high pTg, W/Z; high pT jet production; BS mixing; trilinear gauge boson coupling; BFKL pomeron …

SuperK: atmospheric neutrino mass and mixing discovery

K2K: mixing in accelerator neutrinos


Some major Stony Brook hardware fabrication:

CUSB: crystal calorimeter electronics, DAQ

E605: first ring imaging Cerenkov detector

ISR: p0 spectrometer

AGS electrons: electron/photon calorimeters

DØ: central drift chamber, LAr calorimeter electronics, forward preshower, level 1 preshower trigger, Layer 0 silicon strips

SuperK: outer detector PM testing

K2K: near detector scintillating strips

ATLAS: calorimeter HV feedthroughs


*Ties Behnke – Central drift chamber tests (faculty, Univ. Hamburg/DESY)

*Domenic Pizzuto – drift chamber performance (financial industry)

Jim Cochran – top cross section (em channel) (faculty, Iowa State)

Joey Thompson – top cross section (m+jets channel) (Photo-optics industry)

*Terry Heuring – electrons in central calorimeter (Defense Dept)

Marc Paterno – squark gluino search (Fermilab staff)

*Paul Rubinov – direct photon angular dist. (Fermilab staff)

*Dhiman Chakraborty – top production (faculty, No. Illinois Univ.)

*Jaehoon Yu – jet production/aS (faculty, Univ Texas Arlington)

*Scott Snyder – top quark mass (BNL staff physicist)

Hailin Li -- W→ t and lepton universality (software industry)

*Ting Hu – W width (software industry)

*John Jiang – pT distribution of Z’s (SLAC/industry in CA)

*Greg Landsberg – Trilinear ZZg, Zgg couplings (faculty, Brown Univ.)

*Wei Chen – direct diphoton production

Dennis Shpakov – WZ mass ratio (Fermilab staff)

*Slava Kulik – W mass (financial industry)

Marian Zdrazil – doubly charged Higgs search (postdoc LBNL)

*Zarah Casilum – Z+jets production (via SUNY Buffalo)

Abid Patwa – forward preshower and J/y trigger (BNL staff)

Zhong Min Wang – jet production

*Yildirim Mutaf – Zb production (Mayo clinic postdoc)

*Satish Desai – technicolor search in W(m)bb (Fermilab postdoc)

Where do our students go?

An example - Stony Brook PhDs from DØ

(* = NSF support)

23 PhDs – 12 now in HEP


  • NSFa Group profile:

  • Faculty/Senior NSFa group physicists:

  • Before ~1985 two NSF groups:

  • (a) Lee-Franzini, Engelmann*, McCarthy*, Schamberger* working at CUSB, Fermilab dihadrons/dileptons

  • (b) Good, Finocchiaro, Grannis* (Fermilab dihadrons/ISR/DØ)

  • Amalgamated by NSF in 1980’s into one group with these 7 senior physicists all working on DØ (and some remnants of other expts).

  • Today, 4 senior physicists (*) on NSFa grant. Recent new faculty joined the DOE grants.

  • The university recently approved a new hire in HEP (ATLAS) – propose that this person will join the NSFa grant.

  • Grannis to retire from teaching faculty to become research professor Jan. 2007 (summer support from grant).


NSFa Group profile:

Current students:

Jun Guo – DØ calorimeter, W mass in electron channel

Emanuel Strauss – DØ, calorimeter calibrations

Katy Tschann-Grimm – ATLAS calorimeter, g production

Mustapha Thioye – ATLAS calorimeter (shared with DOE)

Jet Goodson – ATLAS calorimeter, missing ET

Current postdocs:

Yuan Hu – DØ preshower, t trigger, ttbb final states

Dmitri Tsybychev – DØ Si Vtx leader, B physics

Adam Yurkewicz – ATLAS calibrations, DØ W mass

New (replacement for N. Parua) – ATLAS


Physics goals of the NSFa group

  • Particle physics has not had such exciting prospects for many years. There are many fundamental problems on which it seems possible to make real advances with the next round of experiments:

  • What is dark matter – are WIMPs the whole story? Does it connect to new physics in the EWSB sector?

  • What are the small neutrino masses and large mixings telling us? Are neutrinos Majorana or Dirac? Do they imply a new high energy scale, and is this related to other scales?

  • What generates the flavor matrices? Is there new physics in the flavor loops? How can we understand baryon-antibaryon asymmetry in the universe?

  • Are there baryon lepton couplings? Is the proton stable?

    Our colleagues in DOEb group are addressing many of these questions; we benefit from our close interactions. See talks by Jung and McGrew.


Questions, cont’d.

  • How can we characterize dark energy? Are there insights that could come from particle physics (e.g. study of spin 0 fields)?

  • What generates the Electroweak symmetry breaking? Does the Higgs field exist?

  • How is the EW scale stabilized with respect to the GUT scale? What is the new non-SM physics that accomplishes this?

  • Is QCD unified with the EW interaction?

Those of us in the NSFa group have primarily focussed on the last two questions for the past 20 years, and see great opportunity to make substantial progress in the coming years. The prospect for significant new fundamental understanding is great.











The DØ Program

Tevatron should run through FY2009; goal is 8 fb-1 accumulated by end of run. Now have ~2 fb-1. Tevatron is performing very well.


Integrated luminosity

Mean initial luminosity

Integrated luminosity (fb-1)




FY04 FY05 FY06 FY07 FY08 FY09

Primary goals for remaining DØ run: Search for Higgs; constrain SM through top and W mass; evidence for new physics; explore the heavy b-quark states and rare decays.

Dean Schamberger, John Hobbs will discuss in more detail.


SM Higgs boson search

From 2006 summer conferences: within factor ~5 of SM rate.

95% confidence exclusion at Higgs mass:

< 185 GeV

By end of run, DØ/CDF combined can rule out (95% CL) Higgs up to 185 GeV. 5s discovery for mH < 120 GeV.

< 160 GeV

115 GeV

Discover Higgs at 115 GeV

SB involvement in Higgs search will continue – Grannis, Hobbs, Hu, students.


First definitive breakdown of EW Standard Model?

Measure W mass to 40 MeV in each experiment (McCarthy, J. Guo, Hobbs, Zhu, F. Guo). Expect each experiment to measure top mass to 2.5 GeV. (Note that improvement on dmW is even more important than dmt.)

The combination of decreasing errors on W and top masses, and extending the Higgs mass exclusion to higher mass can lead to a clear violation of the SM.

Observing the Higgs would be even better!



b-quark states – heavy systems, rare decays, Bs mixing

D. Tsybychev is a primary player in B physics studies.

New b state spectroscopy

First limit on Bs mixing (CDF did better)

Bs → mm search

DØ strengths are in lepton decay modes, larger acceptance, forward decays.


ATLAS Program

Bob McCarthy, Rod Engelmann, Michael Rijssenbeek will discuss in more detail.

  • Our ATLAS group is relatively not as large as the Stony Brook DØ effort, so we have focussed more tightly.

  • Our primary technical responsibilities:

  • Design, construction, installation of the liquid argon calorimeter HV feedthroughs

  • Calorimeter commissioning

  • Fast trigger boards

  • Calorimeter tests & calibrations

Stony Brook now in CERN to commission, ATLAS – Rijssenbeek, Yurkiewicz, Tschann-Grimm, Thioye (Goodson) + 1 new postdoc. Weekly meetings by video.


  • Formulating Stony Brook/ATLAS physics program

  • Physics program will follow our belief that EWSB is the most important broad topic and will connect to our calorimeter/trigger responsibilities.

  • Early analysis efforts will center on topics that develop key competencies:

  • Direct photon production. These help develop the EM object algorithms, and provide the data sample for jet energy scale calibration (g + jet transverse momentum balance).

  • Jets + missing ET. This aims at the first order SUSY search (cross section for scalar sum of jet ET + MET). Also an opportunity for calibrating and optimizing MET resolution.

  • Leading to longer term possibilities, e.g.:

  • H → WW* → qq ln

  • H → tt (mnmnt + p/r nt)

  • Squark/gluino search in multijets + MET

  • Extra dimensions in qq/gg → jets + MET due to graviton into bulk



International Linear Collider

We expect that the Tevatron and LHC will make dramatic discoveries that extend our understanding of the Electroweak scale and its connection to the GUT/Planck scales. We should also expect that these discoveries require more precise studies to understand what they mean. The ILC can provide new discoveries and illuminate those from LHC.

e.g. LHC will not measure Higgs branching ratios accurately. Deviations of these BRs from SM prediction can tell us whether it is SM Higgs or some other model. ILC can achieve the required precision.

String inspired



SM prediction

Coupling to Higgs →



Ratios of Higgs BRs to SM


dimuon mass

prouction rate


Another example of LHC – ILC synergy: LHC sees a heavy Z state decaying to dileptons. It could be Kaluza Klein state or any of many variants of new strong coupling models. ILC can determine its character through accurate measurement of V and A couplings.

LHC discovery

axial coupling

vector coupling

ILC error


ILC detectors:

ILC detectors are challenging in complementary ways to LHC; need to identify quarks (high quality pixel vertex detectors) and give very good resolution for jet energy (goal is dE/E = 30%/√E). This requires ‘particle flow calorimetry’ with very fine segmentation, new pattern recognition algorithms for clustering deposits.

These calorimetric techniques have not yet been demonstrated – need test beam validation, software development, benchmarking of full simulation Monte Carlos. We expect to contribute to this program with supplemental funding from ILC detector funds.


ILC engagement

  • Grannis has been broadly engaged in ILC for years:

  • Co-chair of Americas Linear Collider Physics Group (physics and detectors)

  • International LC Steering Committee regional representative

  • Scope & Parameters specification subcommittee

  • International Technology Review Panel (technology choice)

  • Chair, GDE Director search committee

  • ILC Program Manager for ILC: responsible for Americas region accelerator and detector oversight; developing budget; liaison within US government

  • FALC (Funding Agencies Large Colliders) and FALC Resource Group; subgroup to document technological benefits from ILC R&D.


Mike Marx, Bob McCarthy will talk more on educational outreach efforts. We have also given numerous talks to describe our science to public audiences.


Proposed disposition of effort




Senior PIs


Individual postdocs may leave; replacements fill in as shown.

Grad students now 50% DØ, 50% ATLAS; will become predominantly ATLAS at end of 3 yr period. Expect new students to work on ILC R&D during first two years while taking courses.


NSFa 3 year budget proposal

Salaries, fringe and associated overheads are xx%, yy%, zz%



Maintenance, software licenses, miscellaneous: xx%, yy%, zz%




n, p decay, DUSEL


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