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Everything about Upsilon

Twentieth letter in the Greek alphabet

Upsilon or ypsilon is the twentieth letter of the Greek alphabet. In the system of Greek numerals, Υʹ has a value of 400. It is derived from the Phoenician waw (𐤅). Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: UpsilonA 5-minute orientation
  2. Skim a recent paper: Diffractive semi-hard production of a $$J/\psi $$ or a $$\Upsilon $$ from single-parton fragmentation plus a jet in hybrid factorizationInfluential work since 2022
  3. Pick up a classic book: A history of the Upsilon chapter of the Psi upsilon fraternityThe most-reprinted book on the subject
  4. Read the landmark paper: A fit of upsilon and charmonium spectraCited 327 times
  5. Go sideways: RhoA closely related topic
  6. Go sideways: IotaA closely related topic

📖 Definitions

Noun The twentieth letter of Classical and Modern Greek; the twenty-second letter of Old and Ancient Greek.

Noun An upsilon meson, or bottomonium.

🏆 Landmark papers (most cited)

🆕 Influential since 2022

📚 Books worth reading

Ranked by number of editions on Open Library, a rough measure of how lasting a book is.

🔗 Related topics