A trigger of events with a high multiplicity of charged particles at the SVD-2 setup

Avdeichikov, V.V.; Bogdanova, G. A.; Budilov, V.A.; Volkov, V.; Кокоулина, Е. С.; Kutov, A. Ya.; Leflat, A.; Никитин, В. А.; Popov, V.; Rufanov, I.; Kholodenko, A. G.

doi:10.1134/s0020441211020126

Cited by 12 publications

(10 citation statements)

References 5 publications

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“…11) The events originated from nuclear interactions in the trigger hodoscope are the source of noise in determining the event multiplicity. Applying additional criterium to trigger conditions the fraction of events with interactions in the trigger hodoscope was suppressed to less than 4%.…”

Section: §1 Introductionmentioning

confidence: 99%

Neutral Pion Fluctuations in $pp$ Collisions at 50 GeV by SVD-2

Кокоулина¹

2012

Prog. Theor. Phys. Suppl.

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Elena Kokoulina on behalf of the SVD-2 Collaboration JINR, Joliot-Curie 6, 141980 Dubna, Moscow region, Russia Neutral pion fluctuations have been measured in proton interactions at U-70 accelerator (IHEP, Protvino). The experiment is carried out with the SVD-2 setup. Charged and neutral particles were registered simultaneously. The reconstruction of π 0 -mesons is fulfilled using gamma quanta registered with the electromagnetic calorimeter. The corrections on the detectors acceptance, triggering, efficiencies and the reconstruction algorithm were applied. The multiplicity distributions of the neutral pions were analysed to define the scaled variance, ω, for π 0 -mesons. The revealed sharp growth of fluctuations of the neutral pion number at total meson multiplicities more than 22 can indicate the Bose-Einstein condensate formation.

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Section: §1 Introductionmentioning

confidence: 99%

Neutral Pion Fluctuations in $pp$ Collisions at 50 GeV by SVD-2

Кокоулина¹

2012

Prog. Theor. Phys. Suppl.

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“…The performance of the trigger subsystem in the E 190 experiment was described in detail in [53]. The signal for the occurrence of an event with a multiplicity higher than the predetermined threshold is obtained from analysis of signal amplitudes from the trigger scintillation hodoscope.…”

Section: Trigger Hodoscopementioning

confidence: 99%

Spectrometer with a vertex detector for experiments at the IHEP accelerator

et al. 2013

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The stages of development and the current status of the versatile "Spectrometer with a Vertex Detector" setup designed for physics experiments at the U 70 accelerator of the Institute for High Energy Physics (Protvino) is described. The main detectors of the setup are the vertex detector based on silicon microstrip detectors, the wide aperture magnetic spectrometer based on multiwire proportional chambers, and the lead glass hodoscope γ detector. In the setup, there is a fast two level trigger system for selecting required particle interactions. The key characteristics of the setup systems are presented, and the physical results obtained on it are briefly listed. * To study the dependence of the cross sections on the atomic number of the nucleus, a passive target-a lead foil 220 µm thick-is located at a point with Z coordinate of +8 mm, and the passive target-a carbon plate 500 µm thick-is located at a point with Z coordinate of +16 mm.

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“…This setup has been modified. It includes the following elements: a silicon vertex detector (10 planes), a scintillator hodoscope (HM trigger) [4], a magnetic spectrometer (18 proportional chambers and a magnet), a Cherenkov counter and an electromagnetic calorimeter with the large aperture. Drift tracker on the straw-tube base has been also manufactured at JINR, it allows sewing the charged particle tracks leaving vertex detector and incoming to the magnetic spectrometer.…”

Section: Introductionmentioning

confidence: 99%

Search for Collective Phenomena in High Multiplicity Events at Nuclotron and U-70

Avdeichikov¹,

Bogdanova²,

Borzunov³

et al. 2018

KEn

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More than ten-year experimental search for collective phenomena in high multiplicity events has been carried out at the Laboratory of high energy physics at JINR. We present main results, which have been received at the U-70 accelerator (IHEP, Protvino) in the proton collisions and at Nuclotron ( JINR, Dubna) in the nuclear interactions. For interactions, topological cross sections have been gone three orders down and achieved KNO-scaling variable ( / ) 4.5. Probably, the tail of high multiplicity distribution stipulates gluon splitting. In the region of high multiplicity, the formation of pions is predominant. Some collective phenomena are predicted in this region. Using charged multiplicity data, we could restore total (sum of charged and neutral particles) multiplicity and have implemented unique research for fluctuations of the neutral particle number at the given total multiplicity. The revealed growth of scaled variance may indicate the pion (Bose-Einstein) condensate formation. The excess of soft photon yield at interactions of the Nuclotron beams (d, Li and C) with a carbon target has been confirmed. This can be connected with the pion condensate formation. Currently, we prepare two-shoulder electromagnetic calorimeter to carry out experimental studies at BM@N setup and plan to take part in new experiments on heavy ion collisions at Nuclotron.

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A trigger of events with a high multiplicity of charged particles at the SVD-2 setup

Cited by 12 publications

References 5 publications

Neutral Pion Fluctuations in $pp$ Collisions at 50 GeV by SVD-2

Neutral Pion Fluctuations in $pp$ Collisions at 50 GeV by SVD-2

Spectrometer with a vertex detector for experiments at the IHEP accelerator

Search for Collective Phenomena in High Multiplicity Events at Nuclotron and U-70

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