The origin of thermal component in the transverse momentum spectra in high energy hadronic processes

Bylinkin, Alexander A.; Kharzeev, Dmitri E.; Rostovtsev, Andrei A.

doi:10.1142/S0218301314500839

Title: The origin of thermal component in the transverse momentum spectra in high energy hadronic processes

Journal Article · Mon Dec 15 00:00:00 EST 2014 · International Journal of Modern Physics E

DOI:https://doi.org/10.1142/S0218301314500839· OSTI ID:1201333

Bylinkin, Alexander A. ^[1]; Kharzeev, Dmitri E. ^[2]; Rostovtsev, Andrei A. ^[3]

Moscow Inst. of Physics and Technology (MIPT), Moscow (Russian Federation); Inst. of Theoretical and Experimental Physics (ITEP)
Stony Brook Univ., NY (United States). Dept. of Physics and Astronomy; Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Physics
Russian Academy of Sciences (RAS), Moscow (Russian Federation). Inst. for Information Transmission Problems (IITP)

The transverse momentum spectra of hadrons produced in high energy collisions can be decomposed into two components: the exponential ("thermal") and the power ("hard") ones. Recently, the H1 Collaboration has discovered that the relative strength of these two components in Deep Inelastic Scattering (DIS) depends drastically upon the global structure of the event - namely, the exponential component is absent in the diffractive events characterized by a rapidity gap. We discuss the possible origin of this effect and speculate that it is linked to confinement. Specifically, we argue that the thermal component is due to the effective event horizon introduced by the confining string, in analogy to the Hawking-Unruh effect. In diffractive events, the t-channel exchange is color-singlet and there is no fragmenting string - so the thermal component is absent. The slope of the soft component of the hadron spectrum in this picture is determined by the saturation momentum that drives the deceleration in the color field, and thus the Hawking-Unruh temperature. We analyze the data on non-diffractive pp collisions and find that the slope of the thermal component of the hadron spectrum is indeed proportional to the saturation momentum.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC00112704

OSTI ID:: 1201333

Report Number(s):: BNL-107803-2015-JA; KB0301020; TRN: US1500560

Journal Information:: International Journal of Modern Physics E, Vol. 23, Issue 12; ISSN 0218-3013

Publisher:: World ScientificCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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