Contact Information

UC Santa Barbara
CERN
5119 Broida Hall
Physics Department
University of California
Santa Barbara, CA 93106

Mailbox J02400
CH-1211 Genève 23
Switzerland
Office: B510 1-011 or 1-015
+1 805 893 7567 (office)
+1 805 893-8959 (lab)
+1 805 893-8957 (fax)

+41 22 76 71748 (office)
+41 22 76 79496 (office)
+41 (0) 762727404 (mobile)
claudio@physics.ucsb.edu
Claudio.Campagnari@cern.ch

Research

I am an experimental high energy physicist.  I am a member of the CMS collaboration at the Large Hadron Collider (LHC) at CERN.   For non-experts, a good starting point to learn about the LHC and its physics program is the LHC Wikipedia page.

My group in CMS has contributed directly to the discovery of the Higgs boson by studying the WW mode. We have also searched for supersymmetry (SUSY) in dilepton final states (both same and opposite signs), and in a dedicated search for pair production of relatively light top squarks favored by naturalness arguments.  In addition, we have made measurements of Standard Model processes such as top pair and W pair production, searched for 4th generation top-like quarks, and for production of same sign top pairs.  The selected publications listed below give a flavor for the kind of physics that we have been doing.

The LHC is presently being upgraded and will come back on-line with increased energy in 2015.  Our research program of searches for new physics will continue at the higher energy.

On the more technical side, we are now working on upgrading some of the electronics for the muon system.  In the past we worked on muon identification and reconstruction, missing transverse energy studies, photon coversion identification, physics dataset definition, and the development of event visualization tools.  Furthermore, a large fraction of the modules for the CMS tracker were assembled in our lab on the UCSB campus between 2003 and 2006.  

You are welcome to contact me if you would like further information.

Teaching

At UCSB I have taught physics at all levels: from lower division physics for life science majors to particle physics for 2nd year graduate students.  This quarter (Fall 2014) I am teaching Physics 23.

Opportunities for Students

There are openings in my group for students interested in pursuing a PhD in experimental high energy physics at CMS.

There are also opportunities for motivated undergraduates to do research with us, hopefully leading to a senior thesis.

Interested students should get in touch with me directly.  Contact information is available at the top of the page.

Selected Publications

Measurement of top quark-antiquark pair production in association with a W or Z boson in pp collisions at sqrt(s) = 8 TeV Eur. Phys.J. C74 (2014) 3060.

Measurements of the t t-bar charge asymmetry using the dilepton decay channel in pp collisions at sqrt(s) = 7 TeV JHEP 04 (2014) 191.

Measurement of Higgs boson production and properties in the WW decay channel with leptonic final states JHEP 01 (2014) 055 .

Search for new physics in events with same-sign dileptons and jets in pp collisions at sqrt(s)=8 TeV JHEP 01 (2014) 163 .

Measurements of t t-bar spin correlations and top-quark polarization using dilepton final states in pp collisions at 7 TeV Phys. Rev. Lett. 112 182001 (2014) .

Search for top-squark pair production in the single-lepton final state in pp collisions at sqrt(s) = 8 TeV Eur.Phys. J. C73 (2013) 2677 .

Search for new physics in events with same-sign dileptons and b jets in pp collisions at sqrt(s) = 8 TeV JHEP03(2013)037 .

Search for electroweak production of charginos and neutralinos using leptonic final states in pp collisions at sqrt(s) = 7 TeV JHEP 1211(2012) 147.

Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC Phys. Lett. B716, 30 (2012).

Search for new physics with same-sign isolated dilepton events with jets and missing transverse energy Phys. Rev. Lett. 109, 071803 (2012).

Search for new physics in events with opposite-sign leptons, jets, and missing transverse energy in pp collisions at sqrt(s) = 7 TeV Phys. Lett B718, 815 (2013)

Search for new physics in events with same-sign dileptons and b-tagged jets in pp collisions at sqrt(s)=7 TeV JHEP08(2012)110.

Search for physics beyond the standard model in events with a Z boson, jets, and missing transverse energy in pp collisions at sqrt(s)=7 TeV Phys. Lett. B716, 260 (2012).

Search for heavy, top-like quark pair production in the dilepton final state in pp collisions at sqrt(s)=7 TeV Phys. Lett. B716, 103 (2012).

Search for the standard model Higgs boson in the H to ZZ to 2l 2nu channel in pp collisions at sqrt(s) = 7 TeV JHEP 1203 (2012) 040.

Search for the standard model Higgs boson decaying to a W pair in the fully leptonic final state in pp collisions at sqrt(s) = 7 TeV Phys. Lett. B710 91 (2012).

Search for Same-Sign Top-Quark Pair Production at sqrt(s) = 7 TeV and Limits on Flavour Changing Neutral Currents in the Top Sector JHEP 1108 (2011) 005.

Measurement of the t t-bar production cross section and the top quark mass in the dilepton channel in pp collisions at sqrt(s) =7 TeV JHEP 1107 (2011) 049.

Search for new physics with same-sign isolated dilepton events with jets and missing transverse energy at the LHC JHEP06(2011)077

Search for Physics Beyond the Standard Model in Opposite-Sign Dilepton Events at sqrt(s) = 7 TeV JHEP 1106 (2011) 026.

Measurement of WW Production and Search for the Higgs Boson in pp Collisions at sqrt(s) = 7 TeV Phys. Lett. B699 25 (2011).

First Measurement of the Cross Section for Top-Quark Pair Production in Proton-Proton Collisions at sqrt(s)=7 TeV Phys. Lett. B695 424 (2011).

Missing ET in 0.9 and 2.36 TeV pp Collisions CMS-PAS-JME-10-002

Performance of Track-Corrected Missing Transverse Energy in CMS CMS-PAS-JME-09-010

Performance of CMS Muon Reconstruction in Cosmic-Ray Events  JINST 5 T03022 2010.

Search for rare quark-annihilation decays, B-Ds(*)-ϕ   Phys. Rev. D 73, 011103 (2006).

Study of the decay anti-B0 → D*+ ωπ-   Phys. Rev. D74 012001 (2006). 

Measurement of the Charge Collection Efficiency after Heavy Non-Uniform Irradiation in BaBar Silicon Detectors  arXiv:physics/0411182     IEEE Trans. Nucl. Sci., 52, 1054 (2005)

Search for bu transitions in B-D0K- and B-D*0K-  Phys. Rev. D 72, 032004 (2005)

Search for B± → [K π±]DK± and upper limit on the b → u amplitude in B± → D K±   Phys. Rev. Lett. 93 131804 (2004)

Silicon Tracker Module Assembly at UCSB CMS PUBLIC Note 2004/010 (2004).

Measurement of the branching fraction and polarization for the decay B- → D*0 K*-   Phys. Rev. Lett. 92 141801 (2004).

The design and construction of the BaBar Silicon Vertex Tracker   Nucl. Inst. Meth A447 15 (2000).

Measurement of the CP asymmetry amplitude sin2β with B0 mesons  Phys. Rev. Lett. 89 201802 (2002).

Measurement of branching fractions for exclusive B decays to charmonium final states   Phys. Rev. D65 032001 (2002).

The discovery of the top quark  Rev. Mod. Phys. 69 137 (1997).

Observation of top quark production in ppbar collisions with the CDF detector at Fermilab  Phys. Rev. Lett. 74 2626 (1995).

Evidence for top quark production in p-pbar collisions at root-S = 1.8 TeV   Phys. Rev. Lett. 73 225 (1994)

A measurement of the bottom quark production cross section in 1.8 TeV p-pbar collisions using muons from b-quark decays   Phys. Rev. Lett. 71 2396 (1993).

Limit on the top quark mass from proton-antiproton collisions at root-S = 1.8 TeV Phys. Rev. D45 3921 (1992).

Search for W'→ e ν and W'→ μ ν in p-pbar collision at root-S=1.8 TeV   Phys. Rev. Lett. 67 2609 (1991).

Measurement of σ(W → e ν) and σ(Z → ee) in p-pbar collisions at root-S=1800 GeV   Phys. Rev. D44 29 (1991).

Measurement of the ratio σ(W → e ν)/σ(Z → ee) in p-pbar collision at root-S=1.8 TeV   Phys. Rev. Lett. 64 152 (1990).

A search for the decay K+ → π+ μ+e-    Phys. Rev. Lett. 61 2062 (1988).

Search for short lived neutral particle emitted in K+ decay Phys. Rev. Lett. 59 2832 (1987).