ATLAS YIG Kerstin Tackmann  · 

Higgs Physics with Photons

Helmholtz Young Investigator Group of Kerstin Tackmann (2011-2016)

Research Activities

The Young Investigator's Group is situated at DESY and is embedded in the ATLAS group there. It is also closely linked to the University of Hamburg. The group participates in the ATLAS experiment at the Large Hadron Collider (LHC) at CERN. We are focusing on photon-related activities in the ATLAS experiment, and in particular on Higgs boson decays into two photons, and on activities around the current and future silicon microstrip detector.

Excellent candidates interested in Bachelor, Masters or PhD theses are welcome to contact me any time.

Higgs Studies

Silicon Microstrip Detector

We are contributing to several aspects of photon and Higgs studies, ranging from the reconstruction to Higgs studies.

We are contributing to

  • Converted photon reconstruction. Photons converting in the material of the tracking detectors make up for a sizable fraction of photons and are reconstructed using the tracker and the calorimeter.
  • Inner Detector material studies. A precise understanding the material budget of the tracking detectors is needed for the reconstruction of charged particles and electromagnetic objects. Photon conversions in the detector material can be used to study the material distribution.
  • Photon identification and efficiency measurements. The photon idenfitifcation is based on shower shapes in the calorimeter, and needs to be adapted to the expected pileup conditions. Making use of the a clean electron sample selected from Z decays and the similarity of the electromagnetic showers of electrons and photons, the photon identification efficiency can be extrapolated from electrons.
  • Higgs decays into two photons. The diphoton decay channel contributed significantly to the discovery of the new particle in summer 2012. We are now contributing to the detailed study of the properties of the new particle, in particular its production at the LHC, and the measurements of the production and decay kinematics.
  • We also searched for possible Higgs decays into four photons and narrow diphoton resonances in a wider mass range from 60 to 650 GeV.
  • An overview of the group's activities at the time of the Higgs boson discovery may be found in this article (in German): http://www.weltderphysik.de/gebiet/teilchen/bausteine/der-lange-weg-zum-higgs-teilchen/higgs-suche-am-atlas-experiment/
  • Differential cross sections in SM diphoton events, also including jets.
  • Operation of the ATLAS SCT. Online monitoring the detector, and control room shifts.
  • Simulation of radiation damage in the ATLAS SCT. The tracking detectors are accumulating radiation damage, which eventually will need to be accounted for in the simulation of the detector.
  • Lorentz angle in irradiated sensors. One effect of radiation damage is a change in the Lorentz angle of the sensor. This can be studied in a dedicated test beam setup at DESY.
  • Qualification of radiation tolerance high-voltage multiplexers for the upgrade of the silicon microstrip detector.
  • Micro-channel cooling. Micro-channel cooling could offer a possibility to significantly reduce the material budget of the future silicon microstrip detector and is studied in a test setup at DESY.

Teaching

Semester

Title

University

September 2013

Physics at the LHC

Herbstschule Maria Laach

Summer 2013

Lecture: Electroweak and Higgs Physics

DESY Summer Student Program

WS 2012/2013

Proseminar: Teilchen und Astroteilchenphysik

Hamburg

Summer 2012

Lecture: Electroweak and Higgs Physics

DESY Summer Student Program

Spring 2012

Lecture: Physics at the LHC

DESY, Monte Carlo School

SS 2012

Proseminar: Teilchen und Astroteilchenphysik

Hamburg

WS 2011/2012

Proseminar: Teilchen und Astroteilchenphysik

Hamburg

Group Members (YIG and SFB 676 project B9)

 

Group Leader

Postdocs

PhD Students

Master Students

Bachelor Students

Visitors

Current

Kerstin Tackmann

Elisabeth Petit
Yanping Huang
Jike Wang

Eda Yildirim
Christopher Hengler
Marco Fillipuzzi
Martin Bessner
Nils Flaschel

working with us: Phillip Hamnett

Früd Braren

 

Cong Peng (IHEP)

Former

 

Marcos Jimenez Belenguer
Sergei Gleyzer

   

Früd Braren
Jens Multhaup

 

Contact

Kerstin Tackmann
Tackmann
Phone: +49 (0)40 8998 1445
E-Mail: Kerstin Tackmann
Location: 1c / O2.303
DESY
Notkestr. 85, 22607 Hamburg, Germany

Publications

*Measurements of the Total and Differential Higgs Boson Production Cross Sections Combining the H->gammagamma and H->ZZ(*)->4l Decay Channels at sqrt(s)=8 TeV with the ATLAS Detector. The ATLAS Collaboration. arXiv:1504.05833 [hep-ex].

*Constraints on the off-shell Higgs boson signal strength in the high-mass ZZ and WW final states with the ATLAS detector. The ATLAS Collaboration. arXiv: 1503.01060 [hep-ex]. Accepted by EPJC.

*Development of n+-in-p large-area silicon microstrip sensors for very high radiation environments -- ATLAS12 design and initial results. Y. Unno et al. Nucl. Instrum. Meth. A 765, 80 (2014).

*H->gammagamma measurements at the ATLAS experiment. Kerstin Tackmann. Proceedings for ICHEP 2014, to be published in Nucl. Phys. B Proceedings Supplement.

*Measurement of Higgs boson production in the diphoton decay channel in pp collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector. The ATLAS Collaboration. arXiv:1408.7084 [hep-ex]. Phys. Rev. D90, 112015 (2014).

*Search for Scalar Diphoton Resonances in the Mass Range 65-600 GeV with the ATLAS Detector in pp Collision Data at sqrt(s)=8 TeV. The ATLAS Collaboration. arXiv:1407.6583 [hep-ex]. Phys. Rev. Lett. 113, no. 17, 171801 (2014).

*Measurements of fiducial and differential cross sections for Higgs boson production in the diphoton decay channel at sqrt(s)=8 TeV with ATLAS. The ATLAS Collaboration. arXiv:1407.4222 [hep-ex]. JHEP 1409, 112 (2014).

*Electron and photon energy calibration with the ATLAS detector using LHC Run 1 data. The ATLAS Collaboration. arXiv:1407.5063 [hep-ex]. Eur. Phys. J. C 74, no. 10, 3071 (2014).

*Measurement of the Higgs boson mass from the H->gammagamma and H->ZZ*->4l channels with the ATLAS detector using 25 fb-1 of pp collision data. The ATLAS Collaboration. arXiv:1406.3827 [hep-ex]. Phys. Rev. D 90, 052004 (2014).

*Electron efficiency measurements with the ATLAS detector using the 2012 LHC proton-proton collision data. The ATLAS Collaboation. ATLAS-CONF-2014-032.

*Comparison of the response of the ATLAS detector to electromagnetic processes in data at 8 TeV and simulation using different G4 setups. The ATLAS Collaboration. ATL-PHYS-PUB-2014-003.

*High voltage multiplexing for the ATLAS Tracker Upgrade. E.G. Villani et al. JINST 9 (2014) C01032.

*Search for the Standard Model Higgs boson decay to a photon and a Z boson in pp collisions at sqrt(s)=7 and 8 TeV with the ATLAS detector. The ATLAS Collaboration. arXiv:1402.3051 [hep-ex]. Phys. Lett. B 732, 8 (2014).

*Der Ursprung der Masse. K. Tackmann. PhysikJournal 12 (2013) Nr. 8/9.

*Search for ttH production in the H->gammagamma channel at sqrt(s)=8 TeV with the ATLAS detector. The ATLAS Collaboration. ATLAS-CONF-2013-080.

*Differential cross sections of the Higgs boson measured in the diphoton decay channel with the ATLAS detector using 8 TeV proton-proton collision data. The ATLAS Collaboration. ATLAS-CONF-2013-072.

*Measurements of the Higgs boson production and couplings in diboson final states with the ATLAS detector at the LHC. The ATLAS Collaboration. arXiv:1307.1427 [hep-ex]. Phys. Lett. B 726, 88 (2013).

*Evidence for the spin-0 nature of the Higgs boson using ATLAS data. The ATLAS Collaboration. arXiv:1307.1432 [hep-ex]. Phys. Lett. B 726, 120 (2013).

*Study of the spin of the Higgs-like boson in the two photon decay channel using 20.7 fb-1 of pp collisions collected at sqrt(s)=8 TeV with the ATLAS detector. The ATLAS Collaboration. ATLAS-CONF-2012-029.

*Measurements of the properties of the Higgs-like boson in the two photon decay channel with the ATLAS detector using 25 fb-1 of proton-proton collision data. The ATLAS Collaboration. ATLAS-CONF-2013-012.

*Search for the Standard Model Higgs boson in the H->Zgamma decay mode with pp collisions at sqrt(s)=7 and 8 TeV. The ATLAS Collaboration. ATLAS-CONF-2013-009.

*A model independent determination of the B->Xsgamma decay rate. F. Bernlochner et al. arXiv:1303.0958 [hep-ph]. PoS ICHEP 2012, 370 (2013).

*Observation and study of the Higgs boson candidate in the two photon decay channel with the ATLAS detector at the LHC. The ATLAS Collaboration. ATLAS-CONF-2012-168.

*Search for the Higgs boson in the diphoton decay channel with the ATLAS detector. K. Tackmann on behalf of the ATLAS Collaboration. ATL-PHYS-PROC-2012-272. PoS ICHEP 2012, 068 (2013)

*Measurements of the photon identification efficiency with the ATLAS detector using 4.9 fb-1 of pp collision data collected in 2011. The ATLAS Collaboration. ATLAS-CONF-2012-123.

*Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC. The ATLAS Collaboration. arXiv:1207.7214 [hep-ex]. Phys. Lett. B 716, 1 (2012)

*Observation of an excess of events in the search for the Standard Model Higgs boson in the gamma-gamma channel with the ATLAS detector. The ATLAS Collaboration. ATLAS-CONF-2012-091.

*Search for a Higgs boson decaying to four photons through light CP-odd scalar coupling using 4.9 fb-1 of 7 TeV pp collision data taken with ATLAS detector at the LHC. The ATLAS Collaboration. ATLAS-CONF-2012-079.

*Improved electron reconstruction in ATLAS using the Gaussian Sum Filter-based model for bremsstrahlung. The ATLAS Collaboration. ATLAS-CONF-2012-047.

*Search for the Standard Model Higgs boson in the diphoton decay channel with 4.9 fb-1 of pp collisions at sqrt{s}=7 TeV with ATLAS. The ATLAS Collaboration. Phys. Rev. Lett. 108, 111803 (2012). arXiv:1202.1414 [hep-ex].

*Search for the Standard Model Higgs boson in the diphoton decay channel with 4.9 fb-1 of ATLAS data at sqrt{s}=7 TeV. The ATLAS Collaboration. ATLAS-CONF-2011-161.

*Search for the Standard Model Higgs boson in the two photon decay channel with the ATLAS detector at the LHC. The ATLAS Collaboration. Phys. Lett. B 705, 452 (2011). arXiv:1108.5895 [hep-ex].

*Measurement of the inclusive isolated prompt photon cross-section in pp collisions at sqrt{s}= 7 TeV using 35 pb-1 of ATLAS data. The ATLAS Collaboration. Phys. Lett. B 706, 150 (2011). arXiv:1108.0253 [hep-ex].

*Search for the Higgs Boson in the Diphoton Channel with the ATLAS Detector using 209 pb-1 of 7 TeV Data taken in 2011. The ATLAS Collaboration. ATLAS-CONF-2011-085.

*Update of the Background Studies in the Search for the Higgs Boson in the Two Photons Channel in pp Collisions at sqrt{s}=7 TeV. The ATLAS Collaboration. ATLAS-CONF-2011-071.

 

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