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SUMMARY:From strangeness to charm and beauty with Inner Tracking System of
  ALICE at LHC
DTSTART;VALUE=DATE-TIME:20221202T150000Z
DTEND;VALUE=DATE-TIME:20221202T151500Z
DTSTAMP;VALUE=DATE-TIME:20260517T021810Z
UID:indico-contribution-3266@cern.ch
DESCRIPTION:Speakers: Grigory Feofilov (Saint-Petersburg State University)
 \nFrom strangeness to charm and beauty with Inner Tracking System of ALICE
  at LHC\n\nGrigory Feofilov\, Saint-Petersburg State University\, RF\,\non
  behalf of the ALICE Collaboration\n    \nIn the first part of this talk\,
  we present the major motivations for the current new ALICE physics progra
 mme of measurements of low-momentum charm and beauty hadrons and low-mass 
 dielectrons in heavy-ion collisions at the LHC. These studies of rare proc
 esses will bring unique information on the properties of the quark-gluon p
 lasma (QGP) and\, in particular\, on the process of QGP thermalization and
  its quantitative characterisation\, including the heavy-flavour transport
  coefficients and space–time evolution of the QGP.\n\nWe will show also 
 some several recent experimental observations by the ALICE collaboration i
 n studies of medium induced effects on strange and charm particles yields\
 , shape of jets\, and of residual strong interaction between strange\, cha
 rm and light hadrons. With these interesting results\, new long-term physi
 cs ambitious goals appeared. To reach them\, it was required to solve the 
 most challenging task of improving the ALICE performance for heavy-flavour
  detection. It was at the core of the ALICE upgrade programme in the last 
 decade. The following goals had to be met: (i) coverage in transverse mome
 ntum to be as complete as possible\, in particular\, down to very low mome
 nta\, (ii) very accurate identification of secondary vertices from decayin
 g charm or beauty (D\, J/ψ\, Λc\, Λb). The ALICE Collaboration designed
  the entirely new Inner Tracking System (ITS2) with the increased capabili
 ties in readout speed\, impact parameter resolution and the reduced materi
 al budget. The ITS2 was installed in spring 2021\, commissioned with proto
 n beams in October 2021 and June 2022 and successfully operating in LHC Ru
 n 3 at high collision rates since July 2022.\n\nToday\, the high granulari
 ty ITS2 (12\,5 Gpixels) is the largest pixel detector ever built. It has 1
 0 m2 of thin of 50 and 100 um thick ALPIDE chips— silicon monolithic act
 ive pixel sensors (MAPS) based on CMOS technology. We will present the sta
 tus of ALICE ITS2 in Run 3. We will also discuss briefly the future prospe
 cts for development of the next generation of vertex trackers — the ITS3
 . The most central three cylindrical layers of silicon-only sensors with a
  further significant reduction in the material budget (0.3 → 0.05% X0/la
 yer)\, are supposed to be installed during the Long Shutdown 3 (in 2026-20
 28).\n\nhttps://indico.particle.mephi.ru/event/275/contributions/3266/
LOCATION:Hotel Intourist Kolomenskoye 4* Moskvorechye 2
URL:https://indico.particle.mephi.ru/event/275/contributions/3266/
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