Related Experiment Video
Updated: Sep 4, 2025
07:46
Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
8.6K
Probing Charm Quark Dynamics via Multiparticle Correlations in Pb-Pb Collisions at sqrt[s_{NN}]=5.02 TeV
A Tumasyan1, W Adam2, J W Andrejkovic2
1Yerevan Physics Institute, Yerevan, Armenia.
Physical Review Letters
|July 22, 2022
Summary
Researchers measured charm quark correlations in lead-lead collisions. Using a novel four-particle method, they studied D0 meson behavior and found it similar to other particles, with deviations in central and peripheral collisions.
Area of Science:
- High-energy nuclear physics
- Quantum chromodynamics
- Quark-gluon plasma physics
Background:
- Azimuthal correlations reveal particle behavior in heavy-ion collisions.
- Charm quarks are sensitive probes of the quark-gluon plasma.
- Previous studies used two-particle cumulants for azimuthal anisotropy (v2).
Purpose of the Study:
- To measure multiparticle azimuthal correlations of prompt D0 mesons in Pb-Pb collisions at 5.02 TeV.
- To extract D0 meson v2 using a four-particle cumulant method for the first time.
- To investigate event-by-event fluctuations in charm quark azimuthal anisotropies.
Main Methods:
- Performed measurements in lead-lead (Pb-Pb) collisions at a nucleon-nucleon center-of-mass energy of sqrt[sNN]=5.02 TeV.
- Utilized a four-particle cumulant method to determine the second Fourier coefficient (v2) of D0 mesons.
- Analyzed v2 as a function of event centrality and D0 transverse momentum (pT).
Main Results:
- The ratios of four-particle v2 to two-particle v2 values provide direct access to charm quark anisotropy fluctuations.
- These ratios are comparable to those of inclusive charged particles.
- Deviations from inclusive charged particles were observed in the most central and peripheral collisions.
Conclusions:
- The study provides new insights into charm quark dynamics and fluctuations in the quark-gluon plasma.
- Models of charm quark energy loss (collisional and radiative) were compared to the data.
- Current models do not fully describe the observed data, particularly regarding flow fluctuations.
Related Concept Videos
01:182D NMR: Overview of Heteronuclear Correlation Techniques
292
Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
292
03:08Atomic Radii and Effective Nuclear Charge
52.4K
The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
52.4K
01:19Thomson's e/m Experiment
4.3K
In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The...
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The...
4.3K
01:14Atomic Nuclei: Nuclear Spin State Population Distribution
1.1K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
1.1K
03:18Nuclear Stability
19.5K
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
To hold positively charged protons together...
19.5K
01:19Mass Analyzers: Common Types
700
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
700