Department of Particle Physics and Astrophysics

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Vladimir Smakhtin

Associate Staff
Location:Edna and K.B. Weissman Building of Physical Sciences, Room

Dr. Vladimir Smakhtin has started his career in Experimental High Energy Physics since 1969 when he graduated with a M.S. degree from the Novosibirsk State University, followed by the Ph.D. degree acquired in the Budker Institute of Nuclear Physics, Novosibirsk, Russia in 1979.

Dr. Smakhtin’s career may be chronologically divided into two parts:

  1. In the 1969-1999 he works as a Research Scientist (since 1979 - Senior Research Scientist) in the Budker Institute of Nuclear Physics (BINP). This period also includes more than 15 years of teaching in Novosibirsk Technical State University and supervision of M.Sc. and Ph.D. students in Budker Institute of Nuclear Physics.
  2. Since 1999 until today Dr. Smakhtin works in the Department of Particle Physics and Astrophysics of the Weizmann Institute of Science and today has the position of Senior Associate Staff Scientist.

Research Interests:

1. Israel period (Weizmann Institute of Science)

  • Research and development of trigger system of the ATLAS Muon Spectrometer, LHC, CERN

The ATLAS Muon Spectrometer is one of the most important sub-system of the ATLAS experiment, and its good performance (1-3) during the last LHC running has been crucial to the later discovery of the Higgs boson (4-5). The high performance achieved with the ATLAS Muon Spectrometer is mainly due to the high reliability of its detectors, and in particular of its end cap trigger detectors (TGC) for which Israel is responsible. This was achieved by performing very stringent quality control tests, the main one being the irradiation of the produced detectors with a high radiation source, and the understanding of the failures to feed back into the production. Dr. Smakhtin has been the one that initiated this operation and performed it during a period of 5 years. He has arranged irradiation laboratory and carried out huge work efforts in testing thousands of chambers, also bringing back non-operational ones to life. As a natural step of working with high radiation environment, he has carried out ageing tests with TGC detectors and other components, which are essential for the successful operation of the muon system for the ATLAS experiment.

  • ATLAS muon spectrometer upgrade for super LHC (sLHC)

In 2018, the LHC will be stopped for an upgrade of the injectors and the collimators. During the shutdown, ATLAS intends to accomplish the installation of new Muon Small Wheels (NSW) and introducing of new trigger schemes. The concern is that for high luminosities, in addition to the higher number of pile-up events per bunch-crossing, large amounts of cavern background will be induced, affecting a large region of the NSW. The current system in this region will struggle badly to cope with this and therefore a replacement is required. The NSW must ensure efficient tracking at high collision rate (up to L = 7 × 1034 cm−2s−1), with position resolution of < 100 μm. For this project, Dr. Smakhtin was one of the key persons for a development of the super TGC (sTGC) chambers, which combine detector trigger and precise tracking features in one detection volume. Dr Smakhtin participated throughout all stages of the sTGC development and testing (more than 11 periods of test beams). Partially due to his hard work, these chambers were accepted as a critical part of the NSW for the ATLAS upgrade.

2. Russia period (Budker Institute of Nuclear Physics)

  • Precision measurements of elementary particle masses using resonant depolarization technique developed in Budker Institute

The charged kaon mass measurements are the main part of Dr. Smaktin’s Ph.D. thesis. Masses of charged and neutral kaons as well as other light vector mesons performed in BINP are still the most accurate ones as stated in the “Review of Particle Physics” by the Particle Data Group (9-12).

The resonant depolarization technique developed at BINP has been successfully used for the measurements of the Z and W bosons masses at CERN. For the series of pioneer precise measurements of particle masses with resonance depolarization technique Dr. Smakhtin became the laureate of the State Award of the Soviet Union in 1989.

  • Study of the electro-magnetic decays of light unflavoured mesons

The rare decay modes cross-section measurements of the light vector mesons performed in BINP are still the most accurate ones as stated in the “Review of Particle Physics” by the Particle Data Group (12-15).

  • Precise measurement of hadronic cross-sections at low energy

These measurements (16) were of extreme importance for the Muon Anomalous Magnetic Moment Measurement at BNL (Muon G-2 Collaboration) and for precision electroweak measurements on the Z resonance at LEP (ALEP, DELPHI, L3 and OPAL Collaboration).

Selected Publications:

  1. Expected performance of the ATLAS experiment – Detector, Trigger, Physics. arXiv:0901.0512, 2009
  2. The ATLAS experiment at the CERN large hadron collider. JNST 3:S08003, 2008
  3. The trigger chambers of the ATLAS muon spectrometer; Production and tests. Nucl.Instrum.Meth.A535:265-271, 2004
  4. Combined search for the Standard Model Higgs boson in pp collisions at s√=7  TeV with the ATLAS detector. Phys. Rev. D 86, 032003 – (2012)
  5. Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC. Physics Letters B Volume 716, Issue 1, 17 September 2012, Pages 1–29
  6. Thin Gap Chamber Upgrade for sLHC: Position resolution in a test beam. Nucl.Insrtum.Meth.A598:196-200, 2009
  7. Position resolution and efficiency measurements with large scale Thin Gap Chambers for the super LHC. Nucl.Insrtum.Meth.A628:177-181, 2011
  8. Test of spatial resolution and trigger efficiency of combined Thin Gap and fast Drift Tube Chambers for high-luminosity LHC upgrade.
    Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2011, IEEE 1761-1766
  9. The Charged Kaon Mass Measurement.Nucl.Phys.B148:53-60, 1979
  10. Precision Measurement of the Neutral Kaon Mass. Yad.Fiz.46:1088-1094, 1987
  11. Reanalysis of hadronic cross-section measurements at CMD-2. Phys.Lett.B578:285-289, 2004
  12. Study of the processes e+ e- ---> eta gamma, pi0 gamma ---> 3 gamma in the c.m. energy range 600-MeV to 1380-MeV at CMD-2. Phys.Lett.B605:26-36, 2005
  13. Measurement of phi meson parameters with CMD-2 detector at VEPP-2M collider. Phys.Lett.B364:199-206, 1995 
  14. Study of the rho and omega meson decays into pseudoscalar meson and e+ e- pair with the CMD-2 detector. Phys.Lett.B613:29-38, 2005                                                                                                  
  15. φ(1020) decays modes: Study of conversion decays phi ---> eta e+ e-, eta ---> e+ e- gamma and eta ---> pi+ pi- e+ e- at CMD-2. Phys.Lett.B501:191-199, 2001    
  16. By CMD-2 Collaboration in Phys.Lett.B578:285-289, 2004