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Title: Entanglement entropy production in deep inelastic scattering

Journal Article · · Physical Review. D.
ORCiD logo [1]; ORCiD logo [2];  [3];  [1]
  1. Stony Brook Univ., NY (United States)
  2. Northwest University, Xi’an (China); Stony Brook Univ., NY (United States)
  3. Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

Deep inelastic scattering (DIS) samples a part of the wave function of a hadron in the vicinity of the light cone. Lipatov constructed a spin chain which describes the amplitude of DIS in leading logarithmic approximation. Kharzeev and Levin proposed the entanglement entropy as an observable in DIS [Phys. Rev. D 95, 114008 (2017)], and suggested a relation between the entanglement entropy and parton distributions. Here we represent the DIS process as a local quench in Lipatov’s spin chain and study the time evolution of the produced entanglement entropy. We show that the resulting entanglement entropy depends on time logarithmically, $$\mathcal{S}(t) = 1/3 ln(t/τ)$$ with $$τ = 1/m for 1/m ≤ t ≤ (mx)^{–1}$$, where m is the proton mass and $$\textit{x}$$ is the Bjorken $$\textit{x}$$. The central charge c of Lipatov’s spin chain is determined here to be $$\textit{c}$$ = 1; using the proposed relation between the entanglement entropy and parton distributions, this corresponds to the gluon structure function growing at small $$\textit{x}$$ as $$xG(x) ~ 1/x^{1/3}$$.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China; Shaanxi Natural Science Fundamental Research Program; Shaanxi Key Laboratory
Grant/Contract Number:
SC0012704
OSTI ID:
1866113
Report Number(s):
BNL--222964-2022-JAAM
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 1 Vol. 105; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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