Cryptic crossword clue
This person, family member, produces a tiny bit of physics 5

The most common and most likely answer to this crossword clue is the 5 letter word MESON

I've seen this crossword clue in The Times
M
E
S
O
N

Buddy explains!

The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does MESON mean?

MESON noun
  1. (rare outside entomology) The mesial plane dividing the body into similar right and left halves.
MESON noun
  1. A member of a group of subatomic particles having a mass intermediate between electrons and protons. (The most easily detected mesons fit this definition.)
  2. (now specifically) An elementary particle that is composed of a quark and an antiquark, such as a kaon or pion. (Mesons composed of rarer quarks are much heavier.)

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