Automatic calculation of particle interaction or decay
Overview
 
The automatic calculation of particle interaction or decay is part of the computational particle physics
Computational particle physics
Computational particle physics refers to the methods and computing tools developed in and used by particle physics research. Like computational chemistry or computational biology, it is, for particle physics both a specific branch and an interdisciplinary field relying on computer science,...

 branch. It refers to computing tools that help calculating the complex particle interactions as studied in high-energy physics, astroparticle physics
Astroparticle physics
Astroparticle physics, the same as particle astrophysics, is that branch of particle physics that studies elementary particles of astronomical origin, and their relation to astrophysics and cosmology. It is a relatively new field of research emerging at the intersection of particle physics,...

 and cosmology
Cosmology
Cosmology is the discipline that deals with the nature of the Universe as a whole. Cosmologists seek to understand the origin, evolution, structure, and ultimate fate of the Universe at large, as well as the natural laws that keep it in order...

. The goal of the automation is to handle the full sequence of calculations in an automatic (programmed) way: from the Lagrangian
Lagrangian
The Lagrangian, L, of a dynamical system is a function that summarizes the dynamics of the system. It is named after Joseph Louis Lagrange. The concept of a Lagrangian was originally introduced in a reformulation of classical mechanics by Irish mathematician William Rowan Hamilton known as...

 expression describing the physics model up to the cross-section
Cross section (physics)
A cross section is the effective area which governs the probability of some scattering or absorption event. Together with particle density and path length, it can be used to predict the total scattering probability via the Beer-Lambert law....

s values and to the event generator software.

Particle accelerator or colliders produce collisions (interactions) of particle (like the electron
Electron
The electron is a subatomic particle with a negative elementary electric charge. It has no known components or substructure; in other words, it is generally thought to be an elementary particle. An electron has a mass that is approximately 1/1836 that of the proton...

 or the proton
Proton
The proton is a subatomic particle with the symbol or and a positive electric charge of 1 elementary charge. One or more protons are present in the nucleus of each atom, along with neutrons. The number of protons in each atom is its atomic number....

).
Quotations

A friend is a person with whom I may be sincere. Before him, I may think aloud.

Ralph Waldo Emerson, in "Friendship" in Essays, First series (1841)

Faithful are the wounds of a friend, But deceitful are the kisses of an enemy.

The Bible, Proverbs 27:6 (NASB)

A friendship that can be ended didn't ever start.

Mellin de Saint-Gelais, Oeuvres poétiques

A friend in need is a friend indeed.

Scots proverb, as published in Beauties of Allan Ramsay: Being a Selection of the Most Admired Pieces of that Celebrated Author, viz. The Gentle Shepherd; Christ's Kirk on the Green; The Monk, and the Miller's Wife; with his valuable collection of Scots Proverbs (1815), "Scots Proverbs" Ch. 1; also quoted in Pure Morning|Pure Morning, a song by Placebo|Placebo.

A friend loves at all times, and kinsfolk are born to share adversity.

The Bible, Proverbs 17:17 (NRSV)

A man of many companions may come to ruin, but there is a friend who sticks closer than a brother.

Proverbs 18:24, The Bible (New International Version)

It is amazing how you can surround yourself with so many people you can call friends, and yet actually only have one or two real ones.

Jerry Grant Blakeney

Each friend represents a world in us, a world possibly not born until they arrive, and it is only by this meeting that a new world is born.

Anaïs Nin, Diary entry, March 1937

A faithful friend is a sturdy shelter;he who finds one finds a treasure.A faithful friend is beyond price,no sum can balance his worth.

Sirach 6:14-15 (The New American Bible)

Friendship is not for merriment but for stern reproach when friends go astray.

Tiruvalluvar, Tirukkural: 784

 
x
OK