{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"e3788db5e22dc2c452859904e4d1fb3ad686c482a32d8f01e13399b360f41bee","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":["ai:gpt-5.5"],"kind":"seed"},"parents":["c219475b2ed38ac576b5a1be46e0fdd68be97e82673c4482e63df5dc7870e2a0","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"886c146a7a236b2898adc962680db7eb236d4ce05087e9470a8f06877c066942","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":["ai:gpt-5.5"],"external_id":"nuc.emc-src.tagged-dis-virtuality","kind":"well-posed","literature_status":"open","n":"2","parents":[],"plain":"By detecting the partner nucleon that recoils backward, experiments can select collisions on a nucleon that was moving fast inside deuterium. This tests directly whether fast-moving bound nucleons have modified quark distributions.","posed_since":"","precise":"Measure the struck-nucleon structure function in $d(e, e' N_s) X$ as a function of $x'$ and spectator momentum $p_s$ from $0.25\\text{ to }0.6\\ \\mathrm{GeV}/c$ (JLab BAND and LAD experiments), and determine whether $F2_{\\mathrm{bound}}/F2_{\\mathrm{free}}$ scales with the virtuality $v = (p^\\mu p_\\mu - M^2)/M^2$ as SRC models predict. Answer: the measured function $F2_{\\mathrm{bound}}/F2_{\\mathrm{free}}(x', v)$.","problem_ref":"c219475b2ed38ac576b5a1be46e0fdd68be97e82673c4482e63df5dc7870e2a0","references":"","settled_by":"Spectator-tagged DIS with final-state interactions constrained by the measured angular dependence of the spectator nucleon.","status_note":"","title":"Structure function of a bound nucleon versus its virtuality","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"f573ee2308401ad268c9f1e76aad6bb79c9c9fcf2772759fb90ad877b22e65fd","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"0b6da3e8b09b6f594e8c38aadc1a6a8312aeaba24d9204805db30d63d106e0cb","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"wGN_RA1WdODlkyp1KR6xywNAWqRB2lB46nFxnnV3w2KS-3Lskbgk0BFLERqb3sxvhfSOJYdS8J_OMEwkAOpTAw"},"schema":"pubphys.envelope/1"},"record_hash":"f573ee2308401ad268c9f1e76aad6bb79c9c9fcf2772759fb90ad877b22e65fd","leaf_index":3492}