Sourendu Gupta
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View article: Spin polarization of heavy quarks in matter: predictions from effective field theories
Spin polarization of heavy quarks in matter: predictions from effective field theories Open
The spin polarization of heavy quarks in heavy-ion collisions at the LHC is estimated from effective field theories (EFTs). One EFT is similar to the HQET used at zero temperature. This gives a coupling of the heavy quark spin to colour an…
View article: Limits of thermalization in relativistic heavy ion collisions
Limits of thermalization in relativistic heavy ion collisions Open
The goal of collider programs of high energy heavy-ion collisions is to produce a form of matter that can test non-perturbative aspects of Quantum Chromodynamics (QCD), the theory of strong interactions. One of the primary predictions from…
View article: Fun with colours: the standard model with two colour QCD has radically different long distance physics
Fun with colours: the standard model with two colour QCD has radically different long distance physics Open
In our world the standard model of particle physics contains within it the fairly intractable theory called QCD. A toy version with two colours is often studied as a model confining and chiral symmetry breaking field theory. Here we invest…
View article: The age and sex distribution of COVID-19 cases and fatalities in India
The age and sex distribution of COVID-19 cases and fatalities in India Open
Using anonymous publicly available data on COVID-19 infections and gross outcomes in India, the age and sex distribution of infections and fatalities is studied. The age structure in the count of infections is not proportional to that in t…
View article: Epidemic parameters for COVID-19 in several regions of India
Epidemic parameters for COVID-19 in several regions of India Open
Bayesian analysis of publicly available time series of cases and fatalities in different geographical regions of India during April 2020 is reported. It is found that the initial apparent rapid growthin infections could be partly due to co…
View article: Inferring epidemic parameters for COVID-19 from fatality counts in Mumbai
Inferring epidemic parameters for COVID-19 from fatality counts in Mumbai Open
Epidemic parameters are estimated through Bayesian inference using the daily fatality counts in Mumbai during the period from March 31 to April 14. A doubling time of 5.5 days (median with 95% CrI of 4.6-6.9 days) is observed. In the SEIR …
View article: Estimating the number of COVID-19 infections in Indian hot-spots using fatality data
Estimating the number of COVID-19 infections in Indian hot-spots using fatality data Open
In India the COVID-19 infected population has not yet been accurately established. As always in the early stages of any epidemic, the need to test serious cases first has meant that the population with asymptomatic or mild sub-clinical sym…
View article: Quark Number Susceptibilities and Equation of State in QCD at Finite μB
Quark Number Susceptibilities and Equation of State in QCD at Finite μB Open
One of the main goals of the cold baryonic matter (CBM) experiment at FAIR is to explore the phases of strongly interacting matter at finite temperature and baryon chemical potential μ B . The equation of state of quantum chromodynamics (Q…
View article: Beam Energy Dependence of Jet-Quenching Effects in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Au</mml:mi><mml:mo>+</mml:mo><mml:mi>Au</mml:mi></mml:mrow></mml:math> Collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:mrow><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mi>NN</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:msqrt><mml:mo>=</mml:mo><mml:mn>7.7</mml:mn></mml:mrow></mml:math>, 11.5, 14.5, 19.6, 27, 39, and 62.4 GeV
Beam Energy Dependence of Jet-Quenching Effects in Collisions at , 11.5, 14.5, 19.6, 27, 39, and 62.4 GeV Open
We report measurements of the nuclear modification factor R_{CP} for charged hadrons as well as identified π^{+(-)}, K^{+(-)}, and p(p[over ¯]) for Au+Au collision energies of sqrt[s_{NN}]=7.7, 11.5, 14.5, 19.6, 27, 39, and 62.4 GeV. We ob…
View article: Accelerating lattice QCD simulations with 2 flavors of staggered fermions on multiple GPUs using OpenACC—A first attempt
Accelerating lattice QCD simulations with 2 flavors of staggered fermions on multiple GPUs using OpenACC—A first attempt Open
View article: Effective field theory for warm QCD
Effective field theory for warm QCD Open
Using only global symmetries of QCD, we set up an effective model of quarks at finite temperature near the cross over, including all possible terms up to dimension 6. We first treat this in mean field theory. Then we investigate low-energy…
View article: Beam-Energy Dependence of Directed Flow of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Λ</mml:mi></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mover accent="true"><mml:mi mathvariant="normal">Λ</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>K</mml:mi><mml:mo>±</mml:mo></mml:msup></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>K</mml:mi><mml:mi>s</mml:mi><mml:mn>0</mml:mn></mml:msubsup></mml:math>, and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ϕ</mml:mi></mml:math>in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Au</mml:mi><mml:mo>+</mml:mo><mml:mi>Au</mml:mi></mml:mrow></mml:math>Collisions
Beam-Energy Dependence of Directed Flow of,,,, andinCollisions Open
Rapidity-odd directed-flow measurements at midrapidity are presented for Λ, Λ[over ¯], K^{±}, K_{s}^{0}, and ϕ at sqrt[s_{NN}]=7.7, 11.5, 14.5, 19.6, 27, 39, 62.4, and 200 GeV in Au+Au collisions recorded by the Solenoidal Tracker detector…
View article: Effective thermal models from the lattice
Effective thermal models from the lattice Open
We build effective models of the thermodynamics of QCD and match the couplings using a few measurements from the lattice. We discuss further predictions from the models, including corners where the lattice cannot reach yet.
View article: Equation of State and Freezeout in QCD with Staggered Quarks
Equation of State and Freezeout in QCD with Staggered Quarks Open
We report the equation of state at finite chemical potential, namely the baryon number density and the baryonic contribution to the pressure, using a resummation of the Taylor expansion. We also report the freezeout conditions for a measur…
View article: Bulk properties of the medium produced in relativistic heavy-ion collisions from the beam energy scan program
Bulk properties of the medium produced in relativistic heavy-ion collisions from the beam energy scan program Open
© 2017 American Physical Society. We present measurements of bulk properties of the matter produced in Au+Au collisions at sNN=7.7,11.5,19.6,27, and 39 GeV using identified hadrons (π±, K±, p, and p) from the STAR experiment in the Beam En…
View article: Effective Field Theory Models for Thermal QCD
Effective Field Theory Models for Thermal QCD Open
View article: Direct virtual photon production in Au+Au collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msqrt><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>200</mml:mn><mml:mtext> </mml:mtext><mml:mtext>GeV</mml:mtext></mml:math>
Direct virtual photon production in Au+Au collisions at Open
View article: Quark number susceptibilities and equation of state at finite chemical potential in staggered QCD with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>N</mml:mi><mml:mi>t</mml:mi></mml:msub><mml:mo>=</mml:mo><mml:mn>8</mml:mn></mml:math>
Quark number susceptibilities and equation of state at finite chemical potential in staggered QCD with Open
We report the measurement of quark number susceptibilities (QNS) and their\ntemperature dependence from simulations of QCD with two flavours of light\ndynamical staggered quarks at finite temperature on 8 * 32^3 lattices. From the\nradius …
View article: Elliptic flow of electrons from heavy-flavor hadron decays in Au + Au collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>200</mml:mn></mml:mrow></mml:math>, 62.4, and 39 GeV
Elliptic flow of electrons from heavy-flavor hadron decays in Au + Au collisions at , 62.4, and 39 GeV Open
We present measurements of elliptic flow (v2) of electrons from the decays of heavy-flavor hadrons (eHF) by the STAR experiment. For Au+Au collisions at sNN=200 GeV we report v2, for transverse momentum (pT) between 0.2 and 7 GeV/c, using …
View article: Looking at the deconfinement transition using Wilson flow
Looking at the deconfinement transition using Wilson flow Open
Wilson flow is an effective tool for constructing renormalized composite operators. We explore use of the Wilson flow to construct renormalized order parameters for the deconfinement transition in SU(3) gauge theory. We discuss renormaliza…
View article: Looking at the deconfinement transition using Wilson flow
Looking at the deconfinement transition using Wilson flow Open
Wilson flow is an effective tool for constructing renormalized composite operators. We explore use of the Wilson flow to construct renormalized order parameters for the deconfinement transition in SU(3) gauge theory. We discuss renormaliza…
View article: Bayesian priors and nuisance parameters
Bayesian priors and nuisance parameters Open
Bayesian techniques are widely used to obtain spectral functions from correlators. We suggest a technique to rid the results of nuisance parameters, ie, parameters which are needed for the regularization but cannot be determined from data.…
View article: Using Wilson flow to study the SU(3) deconfinement transition
Using Wilson flow to study the SU(3) deconfinement transition Open
We explore the use of Wilson flow to study the deconfinement transition in SU(3) gauge theory. We use the flowed Polyakov loop as a renormalized order parameter for the transition, and use it to renormalize the Polyakov loop. We also study…
View article: Statistical tweaks and meson masses
Statistical tweaks and meson masses Open
We compare lattice scales determined from the vector meson mass and the\nWilson flow scale w_0 in QCD with two-flavours of rooted naive staggered\nfermions over a wide range of lattice spacing and quark mass. We find that the\ndistribution…
View article: Lambda phenomena: The Lambda points of liquid Helium and chiral QCD
Lambda phenomena: The Lambda points of liquid Helium and chiral QCD Open
The superfluid transition of liquid Helium shares an interesting phenomenon with the chiral limit of QCD: the specific heat is finite at the critical point, but has a cusp. From this follows an interesting mixture of universal and non-univ…
View article: Wilson flow with naive staggered quarks
Wilson flow with naive staggered quarks Open
Scale setting for QCD with two flavors of staggered quarks is examined using Wilson flow over a factor of four change in both the lattice spacing and the pion mass. The statistics needed to keep the errors in the flow scale fixed is found …
View article: Di-hadron correlations with identified leading hadrons in 200 GeV Au + Au and d + Au collisions at STAR
Di-hadron correlations with identified leading hadrons in 200 GeV Au + Au and d + Au collisions at STAR Open
View article: Preface
Preface Open
View article: Charged-to-neutral correlation at forward rapidity in Au + Au collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mi mathvariant="italic">NN</mml:mi></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>200</mml:mn></mml:mrow></mml:math>GeV
Charged-to-neutral correlation at forward rapidity in Au + Au collisions atGeV Open
Event-by-event fluctuations of the multiplicities of inclusive charged particles and photons at forward rapidity in Au+Au collisions at sNN=200 GeV have been studied. The dominant contribution to such fluctuations is expected to come from …