Méson eta

O méson eta (
η
) e méson eta prime (
η′
) são mésons feitos por uma mistura de quark up, quark down e quark estranho e seus antiquarks. O méson eta encantado (
η
c) e o méson eta inferior (
η
b) são formas de quarkônio; eles têm o mesmo spin e paridade que o eta leve, mas são feitos de quarks charms e quarks bottoms respectivamente. O quark top é tão pesado para formar o teórico méson eta superior,
η
t, devido ao seu rápido decaimento.

Composição de quark

As partículas
η
pertencem aos mésons pseudo-escalar com momento angular total igual a zero e paridade negativa, hipercarga, isospin e estranheza igual a zero também. Cada quark que aparece em um méson eta, é acompanhado pelo seu antiquark correspondente, por causa disso ele não tem sabor e todos os seus números quânticos são iguais a zero.^[1]^[2]

A simetria básica SU(3) teoria de quarks para os três quarks mais leves, que apenas leva em consideração a interação forte prevê apenas as partículas correspondentes:

\eta _{1}=\mathrm {\tfrac {u{\bar {u}}+d{\bar {d}}+s{\bar {s}}}{\sqrt {3}}}

, e

\eta _{8}=\mathrm {\tfrac {u{\bar {u}}+d{\bar {d}}-2s{\bar {s}}}{\sqrt {6}}}

Os subscritos referem-se ao fato que o η₁ pertence a um singleto (que é totalmente antissimétrico) e η₈ é parte de um octeto. Contudo nesse caso a interação fraca e a interação eletromagnética, que podem transformar um sabor de quark em outro, causa uma significante, porém pequena, mistura de valor próprio (que mistura de ângulo igual à θ_P = -11,5), portanto a verdade composição de quark é uma combinação linear de três fórmulas. Que são:

\left({\begin{array}{cc}\cos \theta _{\mathrm {P} }&-\sin \theta _{\mathrm {P} }\\\sin \theta _{\mathrm {P} }&\cos \theta _{\mathrm {P} }\end{array}}\right)\left({\begin{array}{c}\eta _{8}\\\eta _{1}\end{array}}\right)=\left({\begin{array}{c}\eta \\\eta '\end{array}}\right)

O nome não subscrito
η
refere-se a real partícula que na verdade foi observada e que é perto da η₈. O
η′
é a partícula observada parecida perto da η₁.

As partículas
η
e
η′
estão mais intimamente relacionadas com o mais conhecido píon neutro
π0
, onde

\pi ^{0}={\rm {\tfrac {u{\bar {u}}-d{\bar {d}}}{\sqrt {2}}}}

De fato π⁰, η₁ e η₈ são três combinações lineares ortogonais dos pares quark up-antiquark up, quark down-antiquark down e quark strange-antiquark strange; eles estão todos no centro do mésons pseudo escalares, com números quânticos iguais a zero.

Geral

O Eta foi descoberto em colisões entre píons e núcleons no Bevatron em 1961 por A. Pevsner em um tempo em que a proposta do caminho óctuplo foi usado para previsões e descobertas de novas partículas das considerações de simetria.

A diferença entre massa do η e do η' é maior do que o Modelo Padrão por naturalmente explicar. Esse quebra-cabeça η-η' é resolvido por instantons.

Referências

↑ «Quark model» (PDF). PDG. 18 de junho de 2012. Consultado em 10 de setembro de 2023
↑ Andrzej Kupsc (5 de setembro de 2007). «What is interesting in eta and eta' Meson Decays?». ArXiv. Consultado em 10 de setembro de 2023

Ligações externas

Eta Meson no Particle Data Group

Read other articles:

Partai Colorado (Uruguay)

Untuk Partai politik di Paraguay dengan nama yang sama, lihat Partai Colorado (Paraguay). Artikel ini memiliki beberapa masalah. Tolong bantu memperbaikinya atau diskusikan masalah-masalah ini di halaman pembicaraannya. (Pelajari bagaimana dan kapan saat yang tepat untuk menghapus templat pesan ini) Keakuratan fakta pada sebagian artikel ini dipertanyakan karena informasi yang terkandung di dalamnya sudah kedaluwarsa. Harap perbarui artikel dengan menambahkan informasi terbaru yang tersedia. ...

Cannabis smoking

Inhalation of marijuana fumes This article is about smoking practices. For drug information, see Cannabis (drug). For other uses, see Cannabis (disambiguation). Hotboxing redirects here. For the Magnapop album, see Hot Boxing. A man smoking cannabis in Kolkata, India Part of a series onCannabis ArtsCulture 420 (chan) Books Magu (deity) Names Religion Judaism Latter-day Saints Sikhism Smoke-in Spiritual use Sports Stoner film Stoner rock Terms Chemistry Cannabinoid receptors Cannabinoid recept...

Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia

Fakultas Ilmu Sosial dan Ilmu PolitikRumpun Ilmu Sosial dan HumanioraUniversitas IndonesiaFISIP UISignature FISIP UI[1]Nama sebelumnyaFakultas Ilmu-ilmu SosialJenisPerguruan Tinggi Negeri Badan Hukum[2]Didirikan1 Februari 1968 (bernama FIPK UI) DekanProf. Dr. Semiarto Aji PurwantoLokasiDepok, Jawa Barat, 16424, IndonesiaKampusUrbanAlamatFakultas Ilmu Sosial dan Ilmu Politik, Jalan Prof. Dr. Selo Soemardjan, Kampus UI DepokWarnaJingga Situs webhttps://fisip.ui.ac.id/ Infor...

Синелобый амазон

Синелобый амазон Научная классификация Домен:ЭукариотыЦарство:ЖивотныеПодцарство:ЭуметазоиБез ранга:Двусторонне-симметричныеБез ранга:ВторичноротыеТип:ХордовыеПодтип:ПозвоночныеИнфратип:ЧелюстноротыеНадкласс:ЧетвероногиеКлада:АмниотыКлада:ЗавропсидыКласс:Пт�...

Independence Day of Cambodia

National holiday in Cambodia Independence Dayបុណ្យឯករាជ្យជាតិIndependence MonumentObserved by CambodiaTypeNationalSignificanceCommemorates the day of the Declaration of Independence from FranceDate9 NovemberNext time9 November 2024 (2024-11-09)FrequencyAnnual Independence Day (Khmer: បុណ្យឯករាជ្យជាតិ; French: Fête de l'Indépendance) is a national holiday observed annually in Cambodia every 9 November. The da...

Kennedy Township, Allegheny County, Pennsylvania

Township in Pennsylvania, United StatesKennedy TownshipTownshipArchangel Gabriel Parish on Forest Grove Road (previously St. Malachy Church).Motto(s): A Great Place To Live, Work, and WorshipLocation in Allegheny County and state of PennsylvaniaCoordinates: 40°28′45″N 80°6′23″W / 40.47917°N 80.10639°W / 40.47917; -80.10639Country United StatesStatePennsylvaniaCountyAlleghenyGovernment • President of BoardAnthony Mollica (R)Area[1&...

1999 Phoenix mayoral election

1999 Phoenix mayoral election ← 1995 7 September 1999 2003 → Candidate Skip Rimsza Randy Pullen Party Nonpartisan Nonpartisan Popular vote 52,053 31,885 Percentage 59.43% 36.40% Mayor before election Skip Rimsza Republican Elected Mayor Skip Rimsza Republican Elections in Arizona Federal government Presidential elections 1912 1916 1920 1924 1928 1932 1936 1940 1944 1948 1952 1956 1960 1964 1968 1972 1976 1980 1984 1988 1992 1996 2000 2004 2008 2012 2016 2020 ...

Idioma gallego

Gallego GalegoHablado en España España Galicia Galicia Principado de Asturias Principado de Asturias (franja occidental) Castilla y León Castilla y León (comarca de Alta Sanabria y occidente de la comarca de El Bierzo)Hablantes 3 221 000[1][2]Puesto 158 (Ethnologue, 2013)Familia Indoeuropeo Itálico Romance Romance occidental Iberorromance ...

銮披汶·颂堪

銮披汶·頌堪แปลก พิบูลสงคราม第3任泰國總理任期1938年12月16日—1944年8月1日君主國王拉玛八世前任披耶帕凤侯爵继任寬·阿派旺第8任泰國總理任期1948年4月8日—1957年9月16日君主國王拉玛九世前任寬·阿派旺继任乃朴·沙拉信个人资料出生貝·基達桑卡(1897-07-14)1897年7月14日暹罗暖武里府逝世1964年6月11日(1964歲—06—11)（66歲）日本神奈川縣相模原市国籍&#...

Vynohradiv

City in Zakarpattia Oblast, Ukraine Not to be confused with Vinohrady. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: Vynohradiv – news · newspapers · books · scholar · JSTOR (February 2015) (Learn how and when to remove this message) City in Zakarpattia Oblast, UkraineVynohradiv ВиноградівNagysz�...

Villuis

Villuis La mairie. Administration Pays France Région Île-de-France Département Seine-et-Marne Arrondissement Provins Intercommunalité Communauté de communes de la Bassée - Montois Maire Mandat Joël Pachot 2020-2026 Code postal 77480 Code commune 77523 Démographie Gentilé Villuisiens Populationmunicipale 255 hab. (2021 ) Densité 28 hab./km2 Géographie Coordonnées 48° 24′ 39″ nord, 3° 21′ 20″ est Altitude Min. 62 mMax. 147 ...

عام الجماعة

عام الجماعة جزء من فتنة مقتل عثمان الدولة الإسلامية قبل عام الجماعة، اللون الأخضر الباهت يظهر المناطق الخاضعة لمعاوية. معلومات عامة التاريخ 41 هـ - 661م النتيجة تنازل الحسن واجتماع البيعة لمعاوية بن أبي سفيان القادة الحسن بن علي معاوية بن أبي سفيان تعديل مصدري - تعديل عام...

Against All Odds (2009)

2009 Total Nonstop Action Wrestling pay-per-view event This article is about the wrestling event. For the 2009 music album, see Against All Odds (N-Dubz album). Against All Odds (2009)Promotional poster featuring The TNA FrontlinePromotionTotal Nonstop Action WrestlingDateFebruary 8, 2009CityOrlando, FloridaVenueTNA Impact! ZoneAttendance1,100[1]Tagline(s)Power Concedes Nothing Without a FightPay-per-view chronology ← PreviousGenesis Next →Destination X Against All Odds ...

Pemberontakan Jacobite 1745

Pemberontakan Empat Puluh Lima[1]Pertempuran Culloden karya David MorierTanggal19 Agustus 1745 – 20 April 1746LokasiBritania RayaHasil Kemenangan besar pemerintah Berakhirnya Jacobitisme sebagai kekuatan politik yang besarPihak terlibat Jacobite Kerajaan Prancis Britania RayaTokoh dan pemimpin Charles Stuart Lord George Murray John O'Sullivan Adipati Cumberland Sir John Cope Henry Hawley Pemberontakan Jacobite 1745, juga dikenal dengan nama Pemberontakan Empat Puluh Lima...

New Hampshire Public Radio

Public radio network in New Hampshire New Hampshire Public RadioBroadcast areaNew Hampshire and bordering areas of Maine, Massachusetts, Vermont and QuebecFrequencySee § StationsBrandingNHPRProgrammingFormatNews/talkAffiliationsNPRPublic Radio InternationalAmerican Public MediaOwnershipOwnerNew Hampshire Public Radio, IncorporatedSister stationsWCNHHistoryFirst air dateAugust 4, 1981 (1981-08-04)Technical informationTranslator(s)See § TranslatorsLinksWebcastListen l...

Miss Grand Kosovo

Artikel ini bukan mengenai Miss Kosovo. Miss Grand KosovoLogo Miss GrandTanggal pendirian2014TipeKontes kecantikanKantor pusatPrištinaLokasi KosovoJumlah anggota Miss Grand InternationalBahasa resmi AlbaniaPresidenSherif Pacolli Frontina Gashi – Miss Grand Kosovo 2020 Miss Grand Kosovo (Albania: Miss Grand Kosovë) adalah kontes kecantikan di Kosovo yang diselenggarakan sejak tahun 2014 oleh Lens Production yang diketuai oleh Sherif Pacolli,[1] dan sebelumnya disiarkan di RTK ...

Solaro (Italia)

Solarocomune Solaro – VedutaLa chiesa parrocchiale dei Santi Quirico e Giulitta LocalizzazioneStato Italia Regione Lombardia Città metropolitana Milano AmministrazioneSindacoNilde Moretti (lista civica Insieme per Solaro) TerritorioCoordinate45°36′54″N 9°05′02″E45°36′54″N, 9°05′02″E (Solaro) Altitudine211 m s.l.m. Superficie6,68 km² Abitanti13 884[1] (31-12-2021) Densità2 078,44 ab./km² FrazioniVillaggio Brollo Comu...

La Défense

Major business district in Île-de-France, France Central business district in Île-de-France, FranceLa DéfenseCentral business districtClockwise from top: La Défense skyline at night; La Défense station; Esplanade with Grande Arche; La Défense de ParisCountryFranceRegionÎle-de-FranceDepartmentHauts-de-SeineCommunes List CourbevoieLa Garenne-ColombesNanterrePuteaux Area • Total5.6 km2 (2.2 sq mi)Population (2022) • Total50,000[1]Time zo...

Teejan Bai

Indian singer Padma VibhushanTeejan BaiBorn (1956-08-08) 8 August 1956 (age 67)Ganiyari village, Durg, ChhattisgarhOccupationPandavani Folk SingerSpouseTukka RamAwardsPadma Vibhushan 2019 Padma Bhushan 2003Padma Shri 1988 Sangeet Natak Akademi Award 1995Fukuoka Prize 2018 Sangeet Natak Akademi Fellowship[1][2] Teejan Bai (born 8 August 1956) is an exponent of Pandavani, a traditional performing art form, from Chhattisgarh, in which she enacts tales from the Mahabharata, w...

Venera

Soviet program that explored Venus with multiple probes For other uses, see Venera (disambiguation). This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: Venera – news · newspapers · books · scholar · JSTOR (May 2014) (Learn how and when to remove this message) Position of Venera landing sites. Red points denote ...