Featured Research

from universities, journals, and other organizations

Large Hadron Collider produces first physics results

Date:
December 15, 2009
Source:
Springer
Summary:
The first article on proton collisions in the CERN Large Hadron Collider -- designed to provide the highest energy ever explored with particle accelerators -- has just been published. In November 2009, during the early commissioning of the LHC, two counter-rotating proton bunches were circulated concurrently for the first time in the machine.

The first paper on proton collisions in the CERN Large Hadron Collider (LHC) -- designed to provide the highest energy ever explored with particle accelerators -- is published online this week in Springer's European Physical Journal C.

On 23 November 2009, during the early commissioning of the CERN (European Organization for Nuclear Research) LHC -- which was built in the circular tunnel of 27km circumference previously used by the Large Electron-Positron collider (LEP) -- two counter-rotating proton bunches were circulated concurrently for the first time in the machine, at the LHC injection energy of 450 GeV per beam.

A total of 284 collisions were recorded by the ALICE* experiment and immediately reconstructed and analyzed. The researchers determined the average number of charged particles emitted perpendicular to the beam direction, known as 'pseudorapidity density'. Their aim was to compare their results with previous measurements of proton-antiproton collisions at the same energy, and to establish a reference for comparison with future measurements at higher LHC energies.

The paper by the ALICE collaboration¹, which brings together authors from 113 research institutes, describes the experimental conditions in detail, as well as the main features of the ALICE detector systems used for the analysis.

The results obtained are consistent with earlier measurements of proton-antiproton interactions at the same energy. They also compare with model calculations.

Dr. Jürgen Schukraft from CERN and ALICE spokesperson said: "This important benchmark test illustrates the excellent functioning and rapid progress of the LHC accelerator, and of both the hardware and software of the ALICE experiment, in this early start-up phase. LHC and its experiments have finally entered the phase of physics exploitation."

*ALICE: A Large Ion Collider Experiment.


Story Source:

The above story is based on materials provided by Springer. Note: Materials may be edited for content and length.


Journal Reference:

  1. Aamodt et al. First proton-proton collisions at the LHC as observed with the ALICE detector: measurement of the charged particle pseudorapidity density at s½ = 900 GeV. The European Physical Journal C, December 2009; DOI: 10.1140/epjc/s10052-009-1227-4

Cite This Page:

Springer. "Large Hadron Collider produces first physics results." ScienceDaily. ScienceDaily, 15 December 2009. <www.sciencedaily.com/releases/2009/12/091215112049.htm>.
Springer. (2009, December 15). Large Hadron Collider produces first physics results. ScienceDaily. Retrieved April 23, 2014 from www.sciencedaily.com/releases/2009/12/091215112049.htm
Springer. "Large Hadron Collider produces first physics results." ScienceDaily. www.sciencedaily.com/releases/2009/12/091215112049.htm (accessed April 23, 2014).

Share This



More Matter & Energy News

Wednesday, April 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Is North Korea Planning Nuclear Test #4?

Is North Korea Planning Nuclear Test #4?

Newsy (Apr. 22, 2014) — South Korean officials say North Korea is preparing to conduct another nuclear test, but is Pyongyang just bluffing this time? Video provided by Newsy
Powered by NewsLook.com
China Falls for 4x4s at Beijing Auto Show

China Falls for 4x4s at Beijing Auto Show

AFP (Apr. 22, 2014) — The urban 4x4 is the latest must-have for Chinese drivers, whose conversion to the cult of the SUV is the talking point of this year's Beijing auto show. Duration: 00:40 Video provided by AFP
Powered by NewsLook.com
Hagel Gets Preview of New High-Tech Projects

Hagel Gets Preview of New High-Tech Projects

AP (Apr. 22, 2014) — Defense Secretary Chuck Hagel is given hands-on demonstrations Tuesday of some of the newest research from DARPA _ the military's Defense Advanced Research Projects Agency program. (April 22) Video provided by AP
Powered by NewsLook.com
Lytro Introduces 'Illum,' A Professional Light-Field Camera

Lytro Introduces 'Illum,' A Professional Light-Field Camera

Newsy (Apr. 22, 2014) — The light-field photography engineers at Lytro unveiled their next innovation: a professional DSLR-like camera called "Illum." Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins