ALICE Upgrade 2 (Silicon Physicist post)
Lead Research Organisation:
University of Liverpool
Department Name: Physics
Abstract
Quantum-ChromoDynamics (QCD) is the theory of the strong force and understanding its properties has been the focus of
intense World-wide research over the past half century. QCD forms a major part of the Standard Model and its
understanding is crucial in producing an overall theory to describe the properties of matter and the fundamental forces of
nature including a grand unification theory to explain how the Universe evolved from the Big Bang.
The principal purpose of our research is to use ultra-relativistic heavy-ion interactions to study QCD at extreme energy
densities. Theoretical models predict that under very extreme conditions of high energy densities the quarks, which are
confined in normal nuclear matter, will be freed and nuclear matter will undergo a phase transition into a hot, dense plasma
of free quarks and gluons known as a Quark-Gluon Plasma (QGP). It is thought that such a state of matter would have
existed until about 10^-5 seconds after the Big Bang, after which time the Universe would have cooled sufficiently for
protons and neutrons to form.
The physics aim of this research is to study the strong force under these extreme conditions and, in particular, explore the
properties of this exotic state of matter. By studying the QGP, we hope to address the fundamental questions of quark
confinement and how quarks gain a large effective mass in hadrons due to the strong force (accounting for 99% of atomic
mass).
In order to create the conditions required to produce a QGP we must collide heavy nuclei together at the highest possible
energies, creating tiny hot (~10^13K) and dense fireballs. As the resulting QGP will only last for about 10-22 seconds,
before condensing in to thousands of elementary particles, we must also use the most sophisticated detectors to analyse
these collisions.
The LHC collides lead ions at centre-of-mass energies of 2.76 TeV in ALICE. We also collide protons together as this forms
an excellent reference data set. Moreover, the excellent particle identification and tracking make ALICE an ideal detector
to study the global aspects of proton-proton collisions in their own right.
This field of research employs about two thousand physicists around the world and ALICE is the most sophisticated
experiment ever built in the field, studying heavy-ion collisions at centre-of-mass energies over an order of magnitude
greater than its nearest rival. It hence represents the pinnacle of research in this field.
The ALICE collaboration is now preparing for the second LHC Upgrade scheduled to start in 2018. These upgrades are
required to cope with the anticipated increase in lead beam luminosity which will increase beam intensities by an order of
magnitude. The main motivation for the luminosity upgrade is to achieve a precise, quantitative understand of the
properties of the QGP by focusing on rare probes both at low and high transverse momenta as well as on multidimensional
analysis of such probes with respect to centrality, event plane, multi-particle correlations, etc.
intense World-wide research over the past half century. QCD forms a major part of the Standard Model and its
understanding is crucial in producing an overall theory to describe the properties of matter and the fundamental forces of
nature including a grand unification theory to explain how the Universe evolved from the Big Bang.
The principal purpose of our research is to use ultra-relativistic heavy-ion interactions to study QCD at extreme energy
densities. Theoretical models predict that under very extreme conditions of high energy densities the quarks, which are
confined in normal nuclear matter, will be freed and nuclear matter will undergo a phase transition into a hot, dense plasma
of free quarks and gluons known as a Quark-Gluon Plasma (QGP). It is thought that such a state of matter would have
existed until about 10^-5 seconds after the Big Bang, after which time the Universe would have cooled sufficiently for
protons and neutrons to form.
The physics aim of this research is to study the strong force under these extreme conditions and, in particular, explore the
properties of this exotic state of matter. By studying the QGP, we hope to address the fundamental questions of quark
confinement and how quarks gain a large effective mass in hadrons due to the strong force (accounting for 99% of atomic
mass).
In order to create the conditions required to produce a QGP we must collide heavy nuclei together at the highest possible
energies, creating tiny hot (~10^13K) and dense fireballs. As the resulting QGP will only last for about 10-22 seconds,
before condensing in to thousands of elementary particles, we must also use the most sophisticated detectors to analyse
these collisions.
The LHC collides lead ions at centre-of-mass energies of 2.76 TeV in ALICE. We also collide protons together as this forms
an excellent reference data set. Moreover, the excellent particle identification and tracking make ALICE an ideal detector
to study the global aspects of proton-proton collisions in their own right.
This field of research employs about two thousand physicists around the world and ALICE is the most sophisticated
experiment ever built in the field, studying heavy-ion collisions at centre-of-mass energies over an order of magnitude
greater than its nearest rival. It hence represents the pinnacle of research in this field.
The ALICE collaboration is now preparing for the second LHC Upgrade scheduled to start in 2018. These upgrades are
required to cope with the anticipated increase in lead beam luminosity which will increase beam intensities by an order of
magnitude. The main motivation for the luminosity upgrade is to achieve a precise, quantitative understand of the
properties of the QGP by focusing on rare probes both at low and high transverse momenta as well as on multidimensional
analysis of such probes with respect to centrality, event plane, multi-particle correlations, etc.
Planned Impact
The main beneficiaries of this upgrade will be experimentalists and theorists working in the field of hot Quantum
Chromodynamics. They will directly benefit from the new insights that will arise out of the research, made possible by this
Upgrade. The results of the subsequent research will be disseminated in high impact journals, through conference talks
and seminars so as to reach as wide an audience as possible. More broadly, both the technologies developed during the
Upgrade and the resulting research will also be of relevance to researchers in other fields, including other areas of nuclear
physics, particle physics, astrophysics and cosmology. Some of the hardware developments related to the Birmingham
design of the original ALICE trigger subsystem have already had impact, having been adopted by another experiment at
CERN. Future developments that are foreseen in this proposal will potentially have relevance to a new generation of
experiments planning to run in continuous data taking mode. The ITS Upgrade project will develop MAPS technologies, an
area where the UK is already considered to be a world leader. Such technologies will not only have applications for other
particle detectors but are likely to have applications in the areas of medicine and security.
Another strand revolves around the public understanding of science. The research that is related to this proposal has the
potential to capture the imagination and to inspire a new generation of scientists. The research programme which will arise
from this Upgrade is involved in studying matter as it would have existed a fraction of a second after the Big Bang. This
aspect is relevant to the evolution of the Early Universe and the possible existence of (strange) quark matter stars.
Members of the ALICE-UK collaboration have given over 70 public lectures over the past five years and been involved in
many other public outreach events to school children, teachers, and members of the general public.
Chromodynamics. They will directly benefit from the new insights that will arise out of the research, made possible by this
Upgrade. The results of the subsequent research will be disseminated in high impact journals, through conference talks
and seminars so as to reach as wide an audience as possible. More broadly, both the technologies developed during the
Upgrade and the resulting research will also be of relevance to researchers in other fields, including other areas of nuclear
physics, particle physics, astrophysics and cosmology. Some of the hardware developments related to the Birmingham
design of the original ALICE trigger subsystem have already had impact, having been adopted by another experiment at
CERN. Future developments that are foreseen in this proposal will potentially have relevance to a new generation of
experiments planning to run in continuous data taking mode. The ITS Upgrade project will develop MAPS technologies, an
area where the UK is already considered to be a world leader. Such technologies will not only have applications for other
particle detectors but are likely to have applications in the areas of medicine and security.
Another strand revolves around the public understanding of science. The research that is related to this proposal has the
potential to capture the imagination and to inspire a new generation of scientists. The research programme which will arise
from this Upgrade is involved in studying matter as it would have existed a fraction of a second after the Big Bang. This
aspect is relevant to the evolution of the Early Universe and the possible existence of (strange) quark matter stars.
Members of the ALICE-UK collaboration have given over 70 public lectures over the past five years and been involved in
many other public outreach events to school children, teachers, and members of the general public.
Publications
Acharya S
(2024)
Measurements of inclusive J/? production at midrapidity and forward rapidity in Pb-Pb collisions at s NN = 5.02 TeV
in Physics Letters B
Acharya S
(2024)
Measurement of the low-energy antitriton inelastic cross section
in Physics Letters B
Acharya S
(2024)
Measurement of the radius dependence of charged-particle jet suppression in Pb-Pb collisions at s NN = 5.02 TeV
in Physics Letters B
Acharya S
(2024)
Pseudorapidity dependence of anisotropic flow and its decorrelations using long-range multiparticle correlations in Pb-Pb and Xe-Xe collisions
in Physics Letters B
Acharya S
(2024)
ALICE luminosity determination for Pb-Pb collisions at vs NN = 5.02 TeV
in Journal of Instrumentation
Acharya S
(2024)
Skewness and kurtosis of mean transverse momentum fluctuations at the LHC energies
in Physics Letters B
Acharya S
(2024)
?(2S) Suppression in Pb-Pb Collisions at the LHC.
in Physical review letters
Acharya S
(2024)
System-size dependence of the hadronic rescattering effect at energies available at the CERN Large Hadron Collider
in Physical Review C
Acharya S
(2024)
Femtoscopic correlations of identical charged pions and kaons in p p collisions at s = 13 TeV with event-shape selection
in Physical Review C
Acharya S
(2023)
Measurements of azimuthal anisotropies at forward and backward rapidity with muons in high-multiplicity p-Pb collisions at s NN = 8.16 TeV
in Physics Letters B
Acharya S
(2023)
Two-particle transverse momentum correlations in p p and p -Pb collisions at energies available at the CERN Large Hadron Collider
in Physical Review C
Acharya S
(2023)
Neutron emission in ultraperipheral Pb-Pb collisions at s N N = 5.02 TeV
in Physical Review C
Acharya S
(2023)
Study of the p-p-K$$^{+}$$ and p-p-K$$^{-}$$ dynamics using the femtoscopy technique
in The European Physical Journal A
Acharya S
(2023)
$$\Sigma (1385)^{\pm }$$ resonance production in Pb-Pb collisions at $$\sqrt{s_{\textrm{NN}}}~=~5.02$$ TeV
in The European Physical Journal C
Acharya S
(2023)
Constraining hadronization mechanisms with ? c + / D 0 production ratios in Pb-Pb collisions at s NN = 5.02 TeV
in Physics Letters B
Acharya S
(2023)
Observation of flow angle and flow magnitude fluctuations in Pb-Pb collisions at s N N = 5.02 TeV at the CERN Large Hadron Collider
in Physical Review C
Acharya S
(2023)
First measurement of ? c + production down to p T = 0 in p p and p -Pb collisions at s N N = 5.02 TeV
in Physical Review C
Acharya S
(2023)
Closing in on critical net-baryon fluctuations at LHC energies: Cumulants up to third order in Pb-Pb collisions
in Physics Letters B
Acharya S
(2023)
First measurement of O c 0 production in pp collisions at s = 13 TeV
in Physics Letters B
Acharya S
(2023)
Measurement of the Lifetime and ? Separation Energy of _{?}^{3}H.
in Physical review letters
Acharya S
(2023)
Enhanced Deuteron Coalescence Probability in Jets
in Physical Review Letters
Acharya S
(2023)
Exclusive and dissociative J / ? photoproduction, and exclusive dimuon production, in p-Pb collisions at s NN = 8.16 TeV
in Physical Review D
Acharya S
(2023)
Pseudorapidity densities of charged particles with transverse momentum thresholds in pp collisions at s = 5.02 and 13 TeV
in Physical Review D
Acharya S
(2023)
Photoproduction of low-pT J/? from peripheral to central Pb-Pb collisions at 5.02 TeV
in Physics Letters B
Acharya S
(2023)
Measurement of inclusive J / ? pair production cross section in p p collisions at s = 13 TeV
in Physical Review C
Acharya S
(2023)
Inclusive quarkonium production in pp collisions at $$\sqrt{s}$$ = 5.02 TeV
in The European Physical Journal C
Acharya S
(2023)
Measurements of Groomed-Jet Substructure of Charm Jets Tagged by D 0 Mesons in Proton-Proton Collisions at s = 13 TeV
in Physical Review Letters
Acharya S
(2023)
Study of flavor dependence of the baryon-to-meson ratio in proton-proton collisions at s = 13 TeV
in Physical Review D
Acharya S
(2023)
Azimuthal correlations of heavy-flavor hadron decay electrons with charged particles in pp and p-Pb collisions at $$\pmb {\sqrt{s_{\mathrm{ {NN}}}}}$$ = 5.02 TeV
in The European Physical Journal C
Acharya S
(2023)
Multiplicity and rapidity dependence of $$\textrm{K}^{*}(\mathrm { {\textbf {892}}})^{0}$$ and $$\mathrm {\phi ({\textbf {1020}})}$$ production in p-Pb collisions at $$\sqrt{s_{\textrm{NN}}} =$$ 5.02 TeV
in The European Physical Journal C
Acharya S
(2023)
Multiplicity dependence of charged-particle production in pp, p-Pb, Xe-Xe and Pb-Pb collisions at the LHC
in Physics Letters B
Acharya S
(2023)
Symmetry plane correlations in Pb-Pb collisions at $${\varvec{\sqrt{s_\text {NN}}}} =2.76$$ TeV
in The European Physical Journal C
Acharya S
(2023)
Measurement of electrons from beauty-hadron decays in p p and Pb-Pb collisions at s N N = 5.02 TeV
in Physical Review C
Acharya S
(2023)
Inclusive photon production at forward rapidities in pp and p-Pb collisions at $$\sqrt{ {{s}}_{\textrm{NN}}}={5.02}$$ TeV
in The European Physical Journal C
Acharya S
(2023)
First measurement of prompt and non-prompt D?+ vector meson spin alignment in pp collisions at s = 13 TeV
in Physics Letters B
Acharya S
(2023)
First measurement of the ?-? interaction in proton-proton collisions at the LHC
in Physics Letters B
Acharya S
(2023)
Measurement of beauty-strange meson production in Pb-Pb collisions at s NN = 5.02 TeV via non-prompt D s + mesons
in Physics Letters B
Acharya S
(2023)
System-size dependence of the charged-particle pseudorapidity density at s NN = 5.02 TeV for pp, p Pb, and Pb Pb collisions
in Physics Letters B
Acharya S
(2023)
Performance of the ALICE Electromagnetic Calorimeter
in Journal of Instrumentation
Acharya S
(2023)
First Measurement of Antideuteron Number Fluctuations at Energies Available at the Large Hadron Collider.
in Physical review letters
Acharya S
(2023)
Data-driven precision determination of the material budget in ALICE
in Journal of Instrumentation
Acharya S
(2023)
Light (anti)nuclei production in Pb-Pb collisions at s N N = 5.02 TeV
in Physical Review C
Acharya S
(2023)
Accessing the strong interaction between ? baryons and charged kaons with the femtoscopy technique at the LHC
in Physics Letters B
Acharya S
(2023)
f0(980) production in inelastic pp collisions at s = 5.02 TeV
in Physics Letters B
Acharya S
(2023)
Investigation of K + K - interactions via femtoscopy in Pb-Pb collisions at s N N = 2.76 TeV at the CERN Large Hadron Collider
in Physical Review C
Acharya S
(2023)
Constraining the $${\overline{\textrm{K}}}{\textrm{N}}$$ coupled channel dynamics using femtoscopic correlations at the LHC
in The European Physical Journal C
Acharya S
(2023)
Higher-order correlations between different moments of two flow amplitudes in Pb-Pb collisions at s N N = 5.02 TeV
in Physical Review C
Acharya S
(2023)
Measurement of the production of (anti)nuclei in p-Pb collisions at s NN = 8.16 TeV
in Physics Letters B
Acharya S
(2023)
Measurement of the ? hyperon lifetime
in Physical Review D
Acharya S
(2023)
Study of charged particle production at high pT using event topology in pp, p-Pb and Pb-Pb collisions at s NN = 5.02 TeV
in Physics Letters B
Description | The ALICE experiment at the CERN LHC has created the highest temperatures and densities every produced in an experiment and re-created the primordial soup which would have existed up to 10 millionths of a second after the Big Bang. There are far too many key findings to list here but we have discovered this super hot and dense primordial soup behaves like a perfect liquid - the most perfect liquid every produced. |
Exploitation Route | This is an ongoing experiment, which will continue to upgrade and take data until at least 2030. |
Sectors | Education,Other |
Description | ALICE Collaboration |
Organisation | European Organization for Nuclear Research (CERN) |
Department | ALICE Collaboration |
Country | Switzerland |
Sector | Public |
PI Contribution | Data analysis of LHC data from Run1 and Run2 (heavy-flavour physics working group). ITS upgrade project: Monte Carlo simulations, construction of modules and staves for the Outer Barrel. Supervision of UG and PhD student projects. Meetings of ALICE-UK research groups (Univ. of Birmingham, Univ. of Liverpool, STFC Daresbury). Presentations at conferences, meetings and workshops. |
Collaborator Contribution | Access to beam time, data, GRID and other CERN infrastructure and resources, ALICE collaboration international network etc. |
Impact | Publications. Training of UG and PhD students and research staff. Invitations to speak at meetings, workshops, conferences. |
Start Year | 2012 |
Description | International Women Day |
Form Of Engagement Activity | A talk or presentation |
Part Of Official Scheme? | No |
Geographic Reach | Local |
Primary Audience | Other audiences |
Results and Impact | Panel Q&A ans discussion around the screening of the film 'Picture a scientist' by Sharon Shattuck & Ian Cheney (https://www.pictureascientist.com/) |
Year(s) Of Engagement Activity | 2022 |