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Veksler and Baldin Laboratory of High Energy Physics

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Veksler and Baldin Laboratory of High Energy Physics The activity of the V. I. Veksler and A. M. Baldin the NICA project (Nuclotron-NICA, MPD, and BM@N Laboratory of High Energy Physics in 2012 was con- subprojects) and the participation in current researches centrated on the realization and further development of in various world-class accelerator centres. THE MOST IMPORTANT RESULTS IN THE DEVELOPMENT OF THE ACCELERATOR COMPLEX Basic Facilities Development at 4 GeV/n) were delivered to the BM@N experi- In 2012, the main activities connected with the Nu- mental hall. clotron development were aimed at the increase of en- 9. R&D on the accelerator parameters' setting and ergy and intensity up to the maximum design values; measurements, tests and the study of the ion beam di- the improvement of stability and reliability; the reduc- agnostic have been continued. tion of losses during capture and acceleration, as well as NICA the quality improvement of the slowly extracted beam. The following tasks were fulˇlled in the course of Nuclotron-NICA the NICA project realization: In the course of Nuclotron modernization and fur- 1. Experimental studies of the booster dipole mag- ther development the following tasks were fulˇlled: net have been carried out after upgrading the power 1. Two runs (the 45th and 46th) of Nuclotron op- supply on the test bench. eration with a total duration of about 1650 hours 2. The development of the infrastructure for the were held. mass-production of new models and prototypes of the 2. All elements of the KRION-6T heavy ion source superconducting magnets for NICA and FAIR has been were fabricated, the assembly of the source was com- continued. pleted and the commissioning of KRION-6T has started. 3. The technical design of the new heavy ion linear 3. The new source of polarized ions was assembled accelerator (HILac) was prepared. at the test bench, the commissioning of the source has 4. The technical design of the collider rings has been begin. approved. 4. The further development of the cryogenic com- 5. Studies of the NICA collider stochastic cooling plex has continued. prototype were carried out at the Nuclotron. 5. Installation and commissioning of the fast current 6. Studies of various stochastic cooling methods and transformer for the Nuclotron injection line have been of particle loss mechanisms during the long circulation completed. have been undertaken. 6. Commissioning of the new thermometry system was completed. ILC 7. The stable operation of the complex was demon- JINR actively participates in the International strated at the beam circulation time of 1000 s; the study Linear Collider (ILC) project Å one of the most in- of the accelerator's optical and cryogenic systems be- teresting future accelerator projects. The basic results havior in a long plateau mode has been carried out. obtained in 2012 contributing to the ILC project are the 8. The acceleration and slow extraction of the following: deuteron beam up to an energy of 4.5 GeV/n was real- 1. The commissioning of the ˇrst acceleration sta- ized; ion beams (carbon at 3.4 GeV/n and deuterons tion of the JINR electron linac was performed. The cur- 66 rent of the e-bunch has achieved a value up to 6 m at 3. The work on the DC photogun test bench aiming energy of 23Ä25 MeV. to the development of the hollow photocathode concep- 2. The undulator based on a changeless magnetic tion development is going on. structure has been assembled at the test-bench in VBL- HEP and the ˇeld quality was measured. The results During 2012, at the total number of 8 arti- show that the required values of the ˇeld distribution cles and 19 reports have been prepared or deliv- and, in particular, the ˇeld magnitude at the poles have ered at international conferences by the members of been achieved. Tasks contribution to the design and the LHEP accelerator division. Two Ph.D. theses manufacturing of the FEL IR deection magnet have and one habilitation (Dr. sc.) have been successfully been performed. defended. THE MOST IMPORTANT EXPERIMENTAL RESULTS CMS The main efforts of the JINR group participating in the CMS physics programme have been focused on research of muon pairs and multiple jet production in order to check the SM predictions and to search for physics beyond the SM [1]. The dimuon mass spec- trum was studied in different invariant mass ranges. The kinematic cuts were optimized and a good agree- ment between experimental data and Monte Carlo pre- dictions was demonstrated. A search for a new high mass resonance decaying to muon pairs has been performed. It is based upon data taken during the years 2011Ä2012 and corresponds to an integrated luminosity of 5.0 fb−1for 2011 and 5.3 fb−1 for 2012 of CMS data collected at 7 TeV and 8 TeV, respectively. Upper limits on the inclusive cross section of heavy dilepton resonances had been predicted in theoretical models with extra gauge bosons Z or as KaluzaÄ Klein graviton excitations G in the Randall-Sundrum Fig. 1. (Color online) Distribution of the four-lepton invari- KK → model. These limits exclude at 95% conˇdence level ant mass for the ZZ 4l (4e, 4μ,and2e2μ) analysis. The points represent the data, the ˇlled histograms represent the a Z with standard-model-like couplings (a ZSSM) be- background, and the open histogram shows the signal expec- low 2270 GeV as well as the superstring-inspired Zψ below 1940 GeV. The combined analysis using dimuon tation for a Higgs boson, added to the background expectation and dielectron events increases signiˇcantly these limits up to 2590 GeV for ZSSM and 2260 GeV for Zψ. Thus, JINR scientists have given 5 presentations at inter- CMS has extended the invariant mass region studied so national conferences. far (covered by LHC and Tevatron at FNAL, USA) and ALICE has established new limits for the onset of new physics. ALICE is a general-purpose heavy-ion detector de- The JINR group has also contributed to the observa- signed to study the properties of strongly interacting ± ± tion of a new boson with a mass of 125.3 0.4(stat.) matter in the form of quarkÄgluon plasma created in → 0.5(syst.) in 2Z 4 lepton decays (Fig. 1). This has nucleusÄnucleus collisions at the LHC. In 2012, ALICE followed the Higgs boson searches of 2011 in ˇve decay carried out data taking with proton beams at 8 TeV, modes: two photons, two tau-leptons, two b-quarks, two with the minimum bias trigger (108 events) and other W -bosons and two Z-bosons. The combined analysis rare triggers (109 events). The short pilot p-Pb run at −1 −1 of the 2011 (5.1 fb ) and 2012 (5.3 fb ) data re- 5.02 TeV also has been successfully carried out. The sults in the observation of an excess of characteristic statistics of nearly 2 · 106 events from this p-Pb run events above the expected background with a signiˇ- has been analyzed, and two ˇrst articles have been cance of 3.2σ. published. 67 Fig. 2. (Color online) Invariant radii versus transverse mass of different particle pairs extracted from the analysis of femtoscopic correlations for PbÄPb collisions at 2.76 TeV per nucleon pair. Blue, green and red points are for event centrality 0Ä10%, 10Ä30%, and 30Ä50%, respectively. An approximate mT scaling is demonstrated JINR group concentrates on the study of BoseÄEinstein correlations between identical mesons. In 2012, an analysis of the dependence of invariant source radii on the transverse√ mass of charged kaons created in PbÄPb collisions at s =2.76 TeV was car- ried out at different selected values of the event central- ity (see Fig. 2) [2]. These results have been presented at four international conferences ATLAS In 2012, the activities of the LHEP group partic- ipating in the ATLAS experiment could be listed as follows: • search for the Standard Model (SM) Higgs boson produced in association with a W -boson which decays to a b-quark pair; • search of manifestations of SUSY; • investigation of the ATLAS liquid argon calorime- Fig. 3. (Color online) The limit on the cross-section value of ter's electronic degradation caused by the LHC high the SM Higgs boson production in association with W -boson −1 luminosity; based on the statistics of 2012 (∼ 13 fb ) • global QCD ˇt of DIS data. iting the 2011 ATLAS data. No indication for a sta- The LHEP group has actively participated in the tistically signiˇcant excess over the SM prediction was search for the SM Higgs boson by studying its produc- obtained and new limits for predictions of some SUSY tion in association with a W -boson. In 2012, ∼ 5 fb−1 have been set. of data recorded in 2011 and ∼ 13 fb−1of data recorded The obtained results have been reported by LHEP in 2012 have been analyzed. As a result, new limit on members at two international conferences. the cross-section value for this channel has been ob- tained (see Fig. 3). An analysis of this channel is also NA62 and NA48/2 Experiments important for the determination of the spin of ¥·Ê candi- Main results obtained in 2012 are: date particle to be the SM Higgs-boson ˇnally reported 1. The straw mass-production has been continued at in 2012. LHEP. More than 3000 straws were manufactured; ap- The programme aimed at searching for hints at proximately 2000 straws have been delivered to CERN. SUSY has been continued in 2012. An inclusive search The straw parameters correspond to the speciˇcation. for the SUSY with one ®hard¯ lepton and with large jet A long-term overpressure test of each straw is in multiplicity in the ˇnal state has been carried out explo- progress.
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