Difference between revisions of "Quark"
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===Conserved Quantities=== | ===Conserved Quantities=== | ||
| + | {| border="1" style="border-collapse:collapse" | ||
| + | | style="height:20px; width:200px; text-align:center;"|'''[[Quark]]''' | ||
| + | | style="height:20px; width:200px; text-align:center;"|[[Electrical Charge|'''Charge''']]/[[Elementary Charge|e]] | ||
| + | | style="height:20px; width:200px; text-align:center;"|'''[[Strangeness]]''' | ||
| + | | style="height:20px; width:200px; text-align:center;"|'''[[Conservation of Baryon Number|Baryon Number]]''' | ||
| + | | style="height:20px; width:200px; text-align:center;"|'''[[Conservation of Lepton Number|Lepton Number]]''' | ||
| + | |||
| + | |- | ||
| + | | style="height:20px; width:200px; text-align:center;"| | ||
| + | [[Up-quark]] | ||
| + | | style="height:20px; width:200px; text-align:center;"|<math>q=+\frac{2}{3}</math> | ||
| + | |||
| + | | style="height:20px; width:200px; text-align:center;"|<math>S=0</math> | ||
| + | | style="height:20px; width:200px; text-align:center;"|<math>b=\frac{1}{3}</math> | ||
| + | | style="height:20px; width:200px; text-align:center;"|<math>l=0</math> | ||
| + | |- | ||
| + | | style="height:20px; width:200px; text-align:center;"| | ||
| + | [[Down-quark]] | ||
| + | | style="height:20px; width:200px; text-align:center;"|<math>q=-\frac{1}{3}</math> | ||
| + | |||
| + | | style="height:20px; width:200px; text-align:center;"|<math>S=0</math> | ||
| + | | style="height:20px; width:200px; text-align:center;"|<math>b=\frac{1}{3}</math> | ||
| + | | style="height:20px; width:200px; text-align:center;"|<math>l=0</math> | ||
| + | |- | ||
| + | | style="height:20px; width:200px; text-align:center;"| | ||
| + | [[Strange-quark]] | ||
| + | | style="height:20px; width:200px; text-align:center;"|<math>q=-\frac{1}{3}</math> | ||
| + | |||
| + | | style="height:20px; width:200px; text-align:center;"|<math>S=-1</math> | ||
| + | | style="height:20px; width:200px; text-align:center;"|<math>b=\frac{1}{3}</math> | ||
| + | | style="height:20px; width:200px; text-align:center;"|<math>l=0</math> | ||
| + | |} | ||
Revision as of 15:30, 18 July 2019
Key Stage 5
Meaning
Quarks are a type of fermion and are the constituent parts of hadrons.
About Quarks
- Quarks are believed to be fundamental particles but they have never been observed on their own.
- Quarks always exist as part of hadron including a baryon, which is a triplet of quarks or a meson which is a quark-antiquark pair.
- There are 6 types of quark including:
- Up-quark - With a charge of \(+\frac{2}{3}\)e, two of which are found in proton and one of which is found in a neutron.
- Down-quark - With a charge of \(-\frac{1}{3}\)e, two of which are found in a neutron and one of which is found in a proton.
- Strange-quark - With a charge of \(-\frac{1}{3}\)e which decays quickly via the weak interaction into a down-quark.
- Top-quark - With a charge of \(+\frac{2}{3}\)e which decays quickly via the weak interaction.
- Bottom-quark - With a charge of \(-\frac{1}{3}\)e which decays quickly via the weak interaction.
- Charm-quark - With a charge of \(+\frac{2}{3}\)e which decays quickly via the weak interaction.
Conserved Quantities
| Quark | Charge/e | Strangeness | Baryon Number | Lepton Number |
| \(q=+\frac{2}{3}\) | \(S=0\) | \(b=\frac{1}{3}\) | \(l=0\) | |
| \(q=-\frac{1}{3}\) | \(S=0\) | \(b=\frac{1}{3}\) | \(l=0\) | |
| \(q=-\frac{1}{3}\) | \(S=-1\) | \(b=\frac{1}{3}\) | \(l=0\) |