Related Experiment Video
Updated: Jun 3, 2026
07:46
Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Beam thrust cross section for Drell-Yan production at next-to-next-to-leading-logarithmic order
Iain W Stewart1, Frank J Tackmann, Wouter J Waalewijn
1Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Physical Review Letters
|March 17, 2011
Summary
Strong initial-state radiation (ISR) is crucial in high-energy particle collisions. This study introduces a new method using beam thrust to measure ISR, offering vital insights for the Large Hadron Collider (LHC) and Tevatron.
Area of Science:
- High Energy Physics
- Particle Collisions
- Quantum Chromodynamics
Background:
- Initial-state radiation (ISR) significantly impacts particle collision outcomes at the LHC and Tevatron.
- ISR can alter partonic luminosity and introduce extra jets or soft radiation, complicating signal analysis.
Purpose of the Study:
- To investigate initial-state radiation (ISR) using isolated Drell-Yan production.
- To utilize the hadronic event shape beam thrust (τB) as an inclusive central jet veto.
- To measure the spectrum of ISR by requiring τB << 1.
Main Methods:
- Performed a resummation of αs(n)ln(m)τB corrections at next-to-next-to-leading-logarithmic order for τB << 1.
- This represents the first resummation at this precision for a hadron-hadron collider event shape.
Main Results:
- The study presents a novel theoretical framework for analyzing ISR in high-energy collisions.
- The developed method allows for precise measurement of the ISR spectrum.
Conclusions:
- Measurements of beam thrust (τB) at the Tevatron and LHC can validate our understanding of ISR.
- The utility of τB as an effective central jet veto is confirmed, enhancing future experimental analyses.
More Related Videos
Related Concept Videos
01:19Thomson's e/m Experiment
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 magnetic...
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 magnetic...
01:15Thin-Walled Hollow Shafts
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
01:21Deformations in a Transverse Cross Section
When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
01:13Linear Momentum in Control Volume
Newton's second law is applied to obtain the linear momentum in a control volume in a fluid system. According to this law, the rate of change of linear momentum is equal to the sum of external forces acting on the system. When a control volume matches the fluid system at a specific moment, the forces acting on both are identical. Reynolds transport theorem helps explain this by breaking down the system's linear momentum into two components: the rate of change of linear momentum within the...
01:14Atomic Nuclei: Nuclear Spin State Population Distribution
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.
02:13Nuclear Binding Energy
The difference between the calculated and experimentally measured masses is known as the mass defect of the atom. In the case of helium-4, the mass defect indicates a “loss” in mass of 4.0331 amu – 4.0026 amu = 0.0305 amu. The loss in mass accompanying the formation of an atom from protons, neutrons, and electrons is due to the conversion of that mass into energy that is evolved as the atom forms. The nuclear binding energy is the energy produced when the atoms’ nucleons are bound together;...