Qhia tawm qhov laj thawj rau kev muaj teeb meem nyob hauv Lub Ntiaj Teb

Qhia tawm qhov laj thawj rau kev muaj teeb meem nyob hauv Lub Ntiaj Teb
Qhia tawm qhov laj thawj rau kev muaj teeb meem nyob hauv Lub Ntiaj Teb
Anonim

Cov kws kho mob Nyij Pooj tau kawm txog qhov ua rau baryon asymmetry - ua txhaum ntawm kev sib npaug ntawm qhov teeb meem thiab cov tshuaj tiv thaiv, uas tuaj yeem piav qhia vim li cas thiaj muaj teeb meem hauv ntiaj teb no. Lawv tau nthuav tawm cov pov thawj txaus ntseeg tshaj plaws rau hnub no tias qhov tsis sib xws yog vim tus cwj pwm ntawm neutrinos. Kab lus ntawm kws tshawb fawb tau luam tawm hauv phau ntawv xov xwm Xwm.

Cov kws tshawb fawb tau soj ntsuam neutrino oscillations hauv T2K (Tokai rau Kamioka) kev sim. Neutrino oscillations yog qhov tshwm sim uas neutrinos hloov pauv lawv. Hauv qhov no, cov kws tshawb fawb tau xav paub txog kev hloov pauv ntawm muon neutrinos thiab muon antineutrinos rau hauv lawv daim iav "daim ntawv" - electron neutrinos thiab electron antineutrinos, feem.

Ib qho ntawm cov xwm txheej tsim nyog rau qhov tseem ceeb tshaj ntawm cov teeb meem antimatter, uas tau pom nyob hauv lub ntiaj teb niaj hnub no, yog kev ua txhaum ntawm kev them nqi sib npaug sib npaug (CP-symmetry), uas yog, txoj cai ntawm lub cev tsis hloov pauv rau cov khoom uas muaj tau dhau los ua cov ntawv sib thooj sib luag thiab tib lub sijhawm tsom iav. Kev tawg ntawm CP sib npaug tau pom rau quarks, tab sis qhov loj ntawm qhov tawg no tau ua kom tsis txaus los piav qhia txog baryon asymmetry. T2K yog tsim los tshawb nrhiav CP ua txhaum cai hauv neutrino oscillations.

Thaum lub sijhawm T2K, lub nqaj ntawm muon neutrinos thiab antineutrinos tau tsim ntawm J-PARC proton accelerator complex nyob ze lub zos Tokai ntawm ntug dej hiav txwv sab hnub tuaj ntawm Nyij Pooj. Cov khoom tau taug kev 295 kilometers thiab tau sau tseg los ntawm Super-Kamiokande neutrino detector hauv Kamioka mine. Ntxiv mus, lawv qhov kev hloov pauv hauv chav kawm ntawm neutrino oscillations.

Cov qib ntawm kev sib tsoo tawg yog txiav txim siab los ntawm qhov ntsuas δ, uas tuaj yeem ntsuas qhov tseem ceeb ntawm -180 degrees txog 180 degrees. Yog tias qhov ntsuas ntsuas sib npaug rau xoom lossis 180 degrees, tom qab ntawd neutrinos thiab antineutrinos yuav hloov lawv tus yam ntxwv zoo ib yam, tsis ua txhaum CP sib npaug. Txawm li cas los xij, δ tuaj yeem txhim kho neutrino lossis antineutrino oscillations, ntsuas qhov ntsuas ntawm -90 degrees lossis 90 degrees, feem. Cov kws tshawb fawb tau hloov kho qhov kev hloov pauv ntawm qhov oscillations los ntawm qhov tseeb tias cov ntsuas tau ua los ntawm qhov teeb meem, tsis yog antimatter.

Cov txiaj ntsig tau txais feem ntau zoo ib yam nrog δ tus nqi ntawm -90 degrees, thiab yam tsawg kawg - hauv thaj tsam ntawm 2 txog 165 degrees ntawm qhov ntsuas tseem ceeb ntawm qib ntawm 99.7 feem pua, uas sib haum rau peb sigma, lossis peb tus qauv sib txawv. Nyob rau tib lub sijhawm, qhov kev nkag siab ntawm qhov kev sim tseem tsis tau txaus los txiav txim siab tseeb tias CP symmetry tau tawg lossis tsis yog. Qhov no xav tau tsib sigma qhov tseem ceeb txheeb cais. Nyob rau yav tom ntej, cov kws tshawb fawb tab tom yuav hloov kho qhov kev sim ua tshiab.

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