Charming

CERN

Published 1975 | Version v1

Periodical article Open

Charming

CERN

Files

vol15-issue4-p103-e.pdf

Files (3.4 MB)

Name	Size	Download all
vol15-issue4-p103-e.pdf md5:3adb60f7afb9f4a0fe52018faa4cd612	997.7 kB	Preview Download
One of the events that started the ball rolling. A neutrino, coming from the right interacts with a neutron in the Gargamelle bubble chamber at CERN and does not give a charged muon emerging. It revealed the existence of 'neutral currents' in weak interactions. The fact that neutral currents do not seem to operate in other interactions, where they are expected, has promoted the idea that another particle property, called charm, is intervening. md5:909665297332c317ca582711b38ec769	158.5 kB	Preview Download
Our present picture of the basic (?) constituents from which all the hadrons (all the particles which feel the strong force) are built up. Baryons have constituents such that the total baryon number is equal to 1 — for example, the proton is made up of Qp Qp Qn which gives its single positive charge with no strangeness and no charm. Mesons have constituents such that the total baryon number is equal to 0 — for example, the negative kaon is made of Q\ Qp (Qp being the ant/'particle of Qp with all the properties of opposite sign) which gives its single negative charge, strangeness and no charm. md5:cbdf963ef9213e7c20c6e8d63d5dae81	330.4 kB	Preview Download
#SPEAR was in normal operation on 25 March and the West region on 8 April. The peak beam energy is now raised to 4 GeV. Event in the CERN heavy liquid bubble chamber, Gargamelle, which is a candidate for a charmed particle. A neutrino (coming in from the left) in interaction with a nucleon seems to have yielded, 1 - a positron, 2 and 3 from decay of a neutral kaon, 4 - negative pion, 5 - positive pion or proton, 6 - muon, 7 - positive pion or proton. If this assignment is correct, the event has a good signature for charm — two leptons are seen emerging from a neutrino interaction together with a strange particle. md5:3c39b2db9045db1247b06448c29c581f	558.9 kB	Preview Download
Part of the huge detection system at the FermiLab where neutrino interactions yielding two muons are being seen. Some completely new interpretation seems needed to explain the origin of these muons. The detectors which can be seen are huge drift chambers (the large square plaques of 4 m side) and cylinders of magnetised iron which form the muon spectrometer. (Photo FermiLab) md5:033a971974acc4b9caa437627cc8d5ba	563.0 kB	Preview Download
The picture from the 7 foot bubble chamber at Brookhaven which is put forward as being most probably the decay of a charmed particle produced in the interaction of an incoming neutrino with a proton. The tracks are assigned to the following particles 1 — negative pion, 2 — positive pion (its muon and electron subsequent decay is also seen in the chamber), 3 — positive pion, 4 — muon, 5 — positive pion, 6 and 7 from decay of a neutral lambda. Some of the reasoning behind the claim that a charm particle is the origin of these tracks is given in the article. md5:07f51743badfc56f0709fc8f2a2ae5bf	275.4 kB	Preview Download
Line up of Directors Genera/ at the Council Session on 21 March. On the left is W. Jentschke, present Director General of CERN Laboratory I. Centre and right, respectively, are J.B. Adams and L. Van Hove who are appointed to lead the combined Laboratories as from 1 January 1976. md5:ed3b56cf2a29e37c20576a74dbea07c7	505.0 kB	Preview Download

Additional details

CDS: 1729894

Issued: 1975-04

	All versions	This version
Views	168	168
Downloads	134	134
Data volume	127.2 MB	127.2 MB

vol15-issue4-p103-e.pdf

Files (3.4 MB)

Identifiers

Dates

Charming

Authors/Creators

Files

vol15-issue4-p103-e.pdf

Files (3.4 MB)

Additional details

Identifiers

Dates

Linked records