HEP-EX

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Spectrum and mass composition of cosmic rays in the energy range 10^15-10^18 eV derived from the Yakutsk array data

: 1. ์•ผ์ฟ ์ธ ํฌ ๋ฐฐ์—ด์˜ ๋…ํŠนํ•œ ์—ญํ•  ์•ผ์ฟ ์ธ ํฌ ๋ฐฐ์—ด์€ ์ฝ”์Šค๋ฏน ๋ ˆ์ด(CR) ์ŠคํŽ™ํŠธ๋Ÿผ๊ณผ ์งˆ๋Ÿ‰ ๊ตฌ์„ฑ ๋ถ„์„์— ์žˆ์–ด ์ค‘์š”ํ•œ ๋„๊ตฌ๋กœ ์ž‘์šฉํ•œ๋‹ค. ์ด ๋ฐฐ์—ด์€ ๊ด‘๋ฒ”์œ„ํ•œ ์—๋„ˆ์ง€ ๋ฒ”์œ„ (10^15 10^19 eV)์—์„œ CR ํ๋ฆ„์„ ํšจ๊ณผ์ ์œผ๋กœ ์ธก์ •ํ•  ์ˆ˜ ์žˆ์œผ๋ฉฐ, ํŠนํžˆ 3 ร— (10^15 10^18) eV์˜ ์—๋„ˆ์ง€ ์˜์—ญ์—์„œ๋Š” ์ด์ „๊นŒ์ง€ ์ƒ์„ธํ•˜๊ฒŒ ์—ฐ๊ตฌ๋˜์ง€ ์•Š์•˜๋˜ ์ค‘์š”ํ•œ ์ •๋ณด๋ฅผ ์ œ๊ณตํ•œ๋‹ค. ์ด๋Ÿฌํ•œ ๋ฐฐ์—ด์€ ๋ชจ๋ธ ๋…๋ฆฝ์  ๊ธฐ๋ฒ•์„ ์‚ฌ์šฉํ•˜์—ฌ ๊ด‘๋ฒ”์œ„ํ•œ ๊ณต๊ธฐ ์ƒค์›Œ(EAS)์˜ ์—๋„ˆ์ง€๋ฅผ ์ถ”์ •ํ•˜๊ณ , ์ฒด๋ Œ์ฝ”ํ”„ ๋น› ๋ฐฉ์ถœ ๊ฐ์ง€๋กœ EAS์˜ ์žฅ๊ฑฐ๋ฆฌ ๋ฐœ๋‹ฌ์„ ์ถ”์ ํ•  ์ˆ˜ ์žˆ๋‹ค. 2. ์ฝ”์Šค๋ฏน ๋ ˆ

HEP-EX Astrophysics Data
An OPERA inspired classical model reproducing superluminal velocities

An OPERA inspired classical model reproducing superluminal velocities

: ๋ณธ ๋…ผ๋ฌธ์€ ์ค‘์„ฑ๋ฏธ์ž์˜ ์ดˆ๊ด‘์† ์ธก์ •์— ๋Œ€ํ•œ ํšŒ์˜์ ์ธ ๊ด€์ ์„ ์ œ์‹œํ•˜๋ฉฐ, ์ด๋ฅผ ์œ„ํ•ด ํ†ต๊ณ„์  ๋ฐฉ๋ฒ•๋ก ๊ณผ ๊ณ ์ „ ๋ฌผ๋ฆฌํ•™ ์›๋ฆฌ๋ฅผ ํ™œ์šฉํ•œ๋‹ค. ํŠนํžˆ, OPERA ์‹คํ—˜์—์„œ ๋„์ถœ๋œ ๊ฒฐ๊ณผ๋ฅผ ์žฌํ•ด์„ํ•˜๊ณ  ๊ทธ ์ด๋ฉด์— ์กด์žฌํ•˜๋Š” ์ˆ˜ํ•™์  ๊ฐœ๋…์„ ๋ช…ํ™•ํžˆ ํ•˜๊ธฐ ์œ„ํ•œ ๋ชฉ์ ์œผ๋กœ ์ž‘์„ฑ๋˜์—ˆ๋‹ค. 1. ์—ฐ๊ตฌ ๋ฐฐ๊ฒฝ ๋ฐ ๋ชฉ์  OPERA ํ˜‘์—…์€ ์ค‘์„ฑ๋ฏธ์ž๊ฐ€ ๋น›์˜ ์†๋„๋ฅผ ์ดˆ๊ณผํ•œ๋‹ค๋Š” ๋†€๋ผ์šด ๊ฒฐ๊ณผ๋ฅผ ๋ฐœํ‘œํ–ˆ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ ๋ณธ ๋…ผ๋ฌธ์—์„œ๋Š” ์ด๋Ÿฌํ•œ ๊ฒฐ๊ณผ์— ๋Œ€ํ•ด ํšŒ์˜์ ์ธ ์ž…์žฅ์„ ์ทจํ•˜๋ฉฐ, ํ†ต๊ณ„์  ์˜ค๋ฅ˜ ๊ฐ€๋Šฅ์„ฑ๊ณผ ๊ณ ์ „ ๋ฌผ๋ฆฌํ•™ ์›๋ฆฌ๋ฅผ ํ†ตํ•ด ์ด๋ฅผ ์žฌํ•ด์„ํ•˜๋ ค๊ณ  ํ•œ๋‹ค. 2. ์—ฐ๊ตฌ ๋ฐฉ๋ฒ•๋ก  ๊ฐ€์ • ๋ฐ ๋ชจ๋ธ๋ง: ํ™•๋ฅ  ๋ฐ€

Physics Model HEP-PH HEP-EX
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Light Nuclei and Isotope Abundances in Cosmic Rays. Results from AMS-01

Catchy Title KO: ์šฐ์ฃผ์„ ์˜ ๊ฒฝ๋Ÿ‰ ์›์†Œ์™€ ๋™์œ„์›์†Œ ํ’๋ถ€๋„: AMS 01์˜ ๋ฐœ๊ฒฌ Abstract KO: ์ด ๋…ผ๋ฌธ์€ Alpha Magnetic Spectrometer 01(AMS 01)์„ ์ด์šฉํ•˜์—ฌ 100 MeV์—์„œ 100 GeV ์‚ฌ์ด์˜ ์—๋„ˆ์ง€ ๋ฒ”์œ„๋ฅผ ๊ฐ€์ง„ ์šฐ์ฃผ์„ ์— ๋Œ€ํ•œ ์—ฐ๊ตฌ ๊ฒฐ๊ณผ๋ฅผ ์ œ์‹œํ•œ๋‹ค. ํŠนํžˆ, ์ด ์—ฐ๊ตฌ๋Š” C, N, O ํ•ต์˜ ์ŠคํŒ”๋ ˆ์ด์…˜ ์‚ฐ๋ฌผ์ธ 2์ฐจ ์ข…๊ณผ ๊ฒฝ์›์†Œ(Li, Be) ๋ฐ ๊ทธ ๋™์œ„์›์†Œ๋“ค์˜ ์ „ํŒŒ ์—ญ์‚ฌ๋ฅผ ํƒ๊ตฌํ•˜๋Š”๋ฐ ์ดˆ์ ์„ ๋งž์ถ”๊ณ  ์žˆ๋‹ค. ์ด๋Ÿฌํ•œ ์›์†Œ์™€ ๋™์œ„์›์†Œ์˜ ํ’๋ถ€๋„๋Š” ์šฐ์ฃผ์„ ์˜ ํ™•์‚ฐ ๋งค๊ฐœ๋ณ€์ˆ˜๋ฅผ ๊ฒฐ์ •ํ•˜๋Š” ๋ฐ ์ค‘์š”ํ•œ ์ •๋ณด๋ฅผ

HEP-EX Astrophysics
Bringing the LHC and ATLAS to a regional planetarium

Bringing the LHC and ATLAS to a regional planetarium

: ์ด ๋…ผ๋ฌธ์€ ๋ฏธ์‹œ๊ฐ„ ์ฃผ๋ฆฝ๋Œ€ํ•™๊ต์˜ ์•„๋ธŒ๋žŒ ์ฒœ๋ฌธ๋Œ€๋ฅผ ํ™œ์šฉํ•œ LHC์™€ ATLAS ์‹คํ—˜์˜ ํ™๋ณด ํ”„๋กœ๊ทธ๋žจ์„ ์†Œ๊ฐœํ•ฉ๋‹ˆ๋‹ค. ์ด ํ”„๋กœ๊ทธ๋žจ์€ ๊ณผํ•™ ๊ต์œก๊ณผ ๋Œ€์ค‘ํ™”์— ์ค‘์š”ํ•œ ์—ญํ• ์„ ํ•˜๋Š” ๋™์‹œ์—, ํ•™์ƒ๋“ค์˜ ์ฐฝ์˜์  ๋Šฅ๋ ฅ๊ณผ ์˜์‚ฌ์†Œํ†ต ๊ธฐ์ˆ ์„ ํ–ฅ์ƒ์‹œํ‚ค๋Š” ๋ฐ ์ค‘์ ์„ ๋‘๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. 1. ์ฒœ๋ฌธ๋Œ€ ํ™œ์šฉ์˜ ์ค‘์š”์„ฑ ์ฒœ๋ฌธ๋Œ€๋Š” ๊ณผํ•™ ๊ต์œก ๋ฐ ํ™๋ณด์— ์ค‘์š”ํ•œ ์—ญํ• ์„ ํ•ฉ๋‹ˆ๋‹ค. ์ „ ์„ธ๊ณ„์ ์œผ๋กœ ์ˆ˜์ฒœ ๊ฐœ์˜ ์ฒœ๋ฌธ๋Œ€๊ฐ€ ๋‹ค์–‘ํ•œ ์—ฐ๋ น๊ณผ ๋ฐฐ๊ฒฝ์„ ๊ฐ€์ง„ ์‚ฌ๋žŒ๋“ค์—๊ฒŒ ๊ณผํ•™์  ์ง€์‹์„ ์ œ๊ณตํ•˜๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. ๋ฏธ์‹œ๊ฐ„ ์ฃผ๋ฆฝ๋Œ€ํ•™๊ต์˜ ์•„๋ธŒ๋žŒ ์ฒœ๋ฌธ๋Œ€๋Š” ๋งค๋…„ ์•ฝ 35,000๋ช…์˜ ๋ฐฉ๋ฌธ๊ฐ์„ ๋งž์ดํ•˜๋ฉฐ, ์ด๋“ค ์ค‘ ๋งŽ์€ ์ด

Physics HEP-EX
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Fluctuations of the depth of maximum in extensive air showers and cross-section of p-air inelastic interaction for energy range 10^15-10^17 eV

: ์ด ๋…ผ๋ฌธ์€ ์•ผ์ฟ ์ธ ํฌ ๋ฐฐ์—ด์„ ์ด์šฉํ•œ ์ดˆ๊ณ ์—๋„ˆ์ง€ ์šฐ์ฃผ์„ (UHECR)์˜ ๊ด€์ธก๊ณผ ๋ถ„์„์— ์ค‘์ ์„ ๋‘๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. ์—ฐ๊ตฌํŒ€์€ ๊ด‘ํ•™์ , ๋ฌด์˜จ์  ๋ฐ ์ฒด๋ Œ์ฝ”ํ”„ ์„ฑ๋ถ„๋“ค์„ ์ธก์ •ํ•˜์—ฌ ๊ด‘๋ฒ”์œ„ํ•œ ๊ณต๊ธฐ ์ƒค์›Œ(EAS)๋ฅผ ์—ฐ๊ตฌํ•˜์˜€์œผ๋ฉฐ, ์ด๋ฅผ ํ†ตํ•ด ์ถฉ์ „ ์ž…์ž์™€ ๋ฌด์˜จ ์ž…์ž์˜ ๋ถ„ํฌ๋ฅผ 1 GeV ์ด์ƒ์œผ๋กœ ๊ด€์ฐฐํ•˜๊ณ , ์ฒด๋ Œ์ฝ”ํ”„ ๋น›์˜ ์ธก๋ฉด์„ ํ†ตํ•ด ๊ณต๊ธฐ ์ƒค์›Œ์˜ ์ˆ˜์ง ๋ฐœ๋‹ฌ์„ ์žฌ๊ตฌ์„ฑํ•˜์˜€์Šต๋‹ˆ๋‹ค. ์ด๋Ÿฌํ•œ ์ธก์ •์€ ์ฒด๋ Œ์ฝ”ํ”„ ๋น›์˜ ๋Œ€๊ธฐ ๋ถ„ํฌ ์กฐ๊ฑด์— ์•ฝํ•˜๊ฒŒ ์˜์กดํ•˜์ง€๋งŒ, ์ƒค์›Œ ๊ธฐํ•˜ํ•™ ์žฌ๊ตฌ์„ฑ์—๋Š” ์ •ํ™•๋„๊ฐ€ ํฌ๊ฒŒ ์˜ํ–ฅ์„ ๋ฏธ์นฉ๋‹ˆ๋‹ค. ๋…ผ๋ฌธ์—์„œ ์ค‘์š”ํ•œ ํฌ์ธํŠธ ์ค‘ ํ•˜๋‚˜๋Š” xโ‚™ ์ตœ๋Œ€ ๋ฐ์ดํ„ฐ๋ฅผ ํ™œ์šฉํ•œ ํƒ„์„ฑ

HEP-EX Astrophysics
High-energy spectrum and zenith-angle distribution of atmospheric neutrinos

High-energy spectrum and zenith-angle distribution of atmospheric neutrinos

: ๋ณธ ๋…ผ๋ฌธ์€ ๊ณ ์—๋„ˆ์ง€ ๋Œ€๊ธฐ ์ค‘์„ฑ๋ฏธ์ž(AN)์˜ ์—๋„ˆ์ง€ ์ŠคํŽ™ํŠธ๋Ÿผ๊ณผ ์ฒœ์ •๊ฐ ๋ถ„ํฌ๋ฅผ ๊ณ„์‚ฐํ•˜๊ณ  ๋‹ค์–‘ํ•œ ๋ชจ๋ธ์„ ํ†ตํ•ด ๊ทธ ๊ฒฐ๊ณผ๋ฅผ ๋ถ„์„ํ•œ๋‹ค. AN์€ ์šฐ์ฃผ์„  ํ•ต์ด ์ง€๊ตฌ ์ƒ์ธต๋Œ€๊ธฐ์™€ ์ถฉ๋Œํ•˜๋ฉด์„œ ์ƒ์„ฑ๋˜๋Š” ์ค‘์„ฑ๋ฏธ์ž๊ฐ€ ๋ถ•๊ดดํ•˜๋Š” ๊ณผ์ •์—์„œ ๋ฐœ์ƒํ•˜๋ฉฐ, ์ด๋Š” ์ €์—๋„ˆ์ง€์—์„œ๋Š” ์ค‘์„ฑ๋ฏธ์ž ์ง„๋™ ์—ฐ๊ตฌ์— ์ค‘์š”ํ•œ ์—ญํ• ์„ ํ•˜๋ฉฐ ๊ณ ์—๋„ˆ์ง€์—์„œ๋Š” ์ฒœ๋ฌธํ•™์  ์ค‘์„ฑ๋ฏธ์ž ์‹คํ—˜์˜ ๋ฐฐ๊ฒฝ ์žก์Œ์œผ๋กœ ์ž‘์šฉํ•œ๋‹ค. ๋…ผ๋ฌธ์€ QGSJET II 03, SIBYLL 2.1 ๋ฐ Kimel & Mokhov(KM) ๋ชจ๋ธ์„ ์‚ฌ์šฉํ•˜์—ฌ AN ํ๋ฆ„์„ ๊ณ„์‚ฐํ•˜๊ณ , ์ด ๊ฒฐ๊ณผ๋ฅผ Frejus, AMANDA II ๋ฐ IceCube

HEP-PH HEP-EX Astrophysics
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Top-quark pair cross-section measurement in the lepton+jets channel

์ด ๋…ผ๋ฌธ์€ LHC ์ดˆ๊ธฐ ๋ฐ์ดํ„ฐ ์ˆ˜์ง‘ ๊ธฐ๊ฐ„ ๋™์•ˆ tt ์Œ์˜ ๊ต์ฐจ ์ ˆ๋‹จ(cross section) ์ธก์ •์— ๋Œ€ํ•œ ์‹ฌ๋„ ์žˆ๋Š” ๋ถ„์„์„ ์ œ๊ณตํ•œ๋‹ค. ์ด ์—ฐ๊ตฌ๋Š” ํผํŠธ๋ฅด๋ธŒ QCD ์˜ˆ์ธก์˜ ์ •ํ™•์„ฑ์„ ๊ฒ€์ฆํ•˜๊ณ , ์ดˆ์›” ํ‘œ์ค€ ๋ชจ๋ธ ๋ฌผ๋ฆฌํ•™ ํƒ์ƒ‰์—์„œ ์ค‘์š”ํ•œ ๋ฐฐ๊ฒฝ์„ ํ˜•์„ฑํ•˜๋ฉฐ, ์ƒˆ๋กœ์šด ๋ฌผ๋ฆฌํ•™ ํƒ์‚ฌ์˜ ์ฒซ๊ฑธ์Œ์ด ๋˜๋Š” ์ธก์ •์— ์ค‘์ ์„ ๋‘”๋‹ค. 1. ์ด๋ก ์  ๋ฐฐ๊ฒฝ ๋ฐ ์ค‘์š”์„ฑ tt ์Œ์˜ ๊ต์ฐจ ์ ˆ๋‹จ์€ pp ์ถฉ๋Œ์—์„œ ์œ„ ์ฟผํฌ์™€ ๋ฐ˜์œ„ ์ฟผํฌ๊ฐ€ ์ƒ์„ฑ๋˜๋Š” ํ™•๋ฅ ์„ ๋‚˜ํƒ€๋‚ธ๋‹ค. ์ด ์ธก์ •์€ ํผํŠธ๋ฅด๋ธŒ QCD ์˜ˆ์ธก๊ณผ ์ง์ ‘ ๋น„๊ตํ•˜์—ฌ ๊ทธ ์ •ํ™•๋„๋ฅผ ๊ฒ€์ฆํ•˜๋Š” ๋ฐ ์‚ฌ์šฉ๋œ๋‹ค. ๋˜ํ•œ, tt ์ƒ์‚ฐ์€ ์ดˆ์›” SM ๋ฌผ

Physics HEP-EX

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