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M a i n    H E P D    a ch i e v e m e n t s
BOOKLET "High Energy Physics Division PNPI. Main scientific activities."  (.pdf = 2,52 Mb)
PNPI Reports: PNPI 2007-2012 (28 Mb) PNPI 2010-2013(5,6 Mb), PNPI 2014(9 Mb),
PNPI 2015(6,7 Mb)

Important work HEPD for 2016 :


  Investigations at the Large Hadron Collider

Overall view of the LHC experiments
Experiments   in   CERN  -  CMS,   ATLAS,   LHCb,   ALICE,   UA9


Heads of PNPI groups:   A.A. Vorobyov (CMS and LHCb), O.L. Fedin (ATLAS), V.M.Samsonov (ALICE), Yu.M. Ivanov (UA9).

Overall layout of the Atlas Detector PNPI has made an extremely large contribution in construction of the collider detectors ATLAS, CMS, LHCb and ALICE. This contribution is described in detail in the booklet "Participation in preparation and performance of experiments at the LHC" (pdf = 5 Mb). Due to this contribution, PNPI has become a full member of LHC experiments. PNPI scientists participate actively in data taking, share responsibilities in maintenance and operation of the detectors and participate in the data analysis. During 20102013, LHC participants have published more than 400 papers. 40 PNPI members are among authors of these papers. Overall layout of the ALICE Detector
      A large number of physical results have been obtained, the most important being the discovery of the Higgs boson.
      Important results also concern the search of contributions of new physics beyond the Standard Model. It has been established that such contributions are absent up to the mass of about 1 TeV.
LHCb Detector       The observation in the LHCb and CMS experiments of a very rare decay of the Bs meson into two mesons is also considered as a result of prime importance. This decay was observed on the level of 3.2 10-9 in agreement with the prediction of the Standard Model. The measured probability of this decay imposes stringent limits on possible existence of new physics. This result was obtained with active participation of PNPI scientists. experiment UA9
     The experiment UA9 has demonstrated that it is possible to cut down the halo of the LHC proton beams using crystals developed at PNPI (pdf) and IHEP. This result can be of great importance for increasing the LHC luminosity. It has been decided to establish a pilot collimation station right in the LHC ring.
3d view of the CMS detector         At present, PNPI participates in the program of the Upgrade of the CMS detector. Adedicated station is arranged for assembly and testing new CMS muon chambers. Seven PNPI engineers participate constantly in this work. Besides that, PNPI has produced a 2500-channel high-voltage system for the CMS detector and is developing a new trigger system. The contribution of PNPI to the CMS Upgrade is estimated to be about 1 million Swiss franks.


  Investigation of collisions of relativistic nuclei.

Experiment *PHENIX* - The page opens in a separate window
Experiment PHENIX (Brookhaven, USA)


Head of the PNPI group:    V.M. Samsonov

In the experiment PHENIX, collisions of relativistic nuclei are investigated in a wide energy range from 8 GeV/nucleon up to 200 GeV/nucleon.
PNPI has made a weighty contribution to the construction of the PHENIX detector. PNPI has built the central tracker, which is one of the cardinal components of the PHENIX set-up. Also, the main magnet of unique design was fabricated in St. Petersburg for the PHENIX experiment. The PNPI group presents the obtained physical results at international conferences on behalf of the PHENIX collaboration. The experiment is going on rather successfully, and it has good perspectives for the following 5 years.
     The main physical result of the PHENIX experiment is the observation of a new state of the nuclear matter quark-gluon liquid.

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Last update on:   by   Svetlana F. Udalova