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Stan van Bentvelsen, de grote deeltjesversneller in Genève

Naar aanleiding van de recente bekendmaking van de ‘waarschijnlijke’ ontdekking van het Higgs-deeltje organiseerde de sectie Natuur- en Sterrenkunde van de KNAW op 11 januari 2012 een minisymposium over de achtergronden en de gevolgen van deze vondst. Topwetenschappers gingen in op vragen als: Waarom zegt men dat het Higgs-deeltje verantwoordelijk is voor het bestaan van sterren en planeten? Hoe kan zo’n buitengewoon zeldzaam deeltje zo invloedrijk zijn? Hoe zeker is de ontdekking?

De wereld van de elementaire deeltjes wordt beschreven door het zogenoemde ‘Standaard Model’. Je kunt de stand van zaken van dit model als volgt samenvatten:
Het Standaard Model is de meest succesvolle theorie ooit. Alle observaties aan elementaire deeltjes en hun onderlinge wisselwerkingen zijn in overeenstemming met het Standaard Model.
Het Standaard Model voorspelt het bestaan van het Higgs deeltje. Het Higgs deeltje representeert het ontbrekende stuk dat essentieel is voor de beschrijving van de massa van deeltjes.
Het Standaard Model is niet kompleet, zit esthetisch niet mooi in elkaar en laat veel vragen onbeantwoord. Het Standaard Model kan niet de ultieme theorie zijn; het bevat bijvoorbeeld geen beschrijving van de zwaartekracht.
Het Atlas experiment bij de Large Hadron Collider rond Geneve, Zwitserland, zal in het bestaan van het Higgs deeltje aantonen – of zijn bestaan uitsluiten. Mogelijk worden er nog veel meer nieuwe vormen van materie gevonden en krijgen we grip op een aantal van de onbeantwoorde vragen van het Standaard Model.
De theorie heeft het te lang zonder experiment moeten doen. Met de start van de Large Hadron Collider gaat de hoge energie fysica een nieuw tijdperk in. Het is een triomf als de donkere materie in ons heelal geïdentificeerd kan worden met nieuwe, vooralsnog onbekende elementaire deeltjes. Het zal ons begrip van het universum veranderen en de kosmologie en deeltjesfysica op een spectaculaire manier samenbrengen.

Prof. dr. Stan Bentvelsen

Curriculum

Korte loopbaanbeschrijving:
1989 afgestudeerd in de theoretische natuurkunde aan de UvA ‘cosmologische scalar fields’
1989-1994 promotie in de experimentele hoge energie fysica aan de UvA, ‘Measurement of the proton structure function at HERA using the ZEUS detector’ (cum laude)
1994-2000 fellow en vervolgens staff medewerker bij CERN, Geneve. Analyse van elektron-positron botsingen bij de LEP versneller.
2000-2005 senior onderzoeker bij FOM – Nikhef. Voorbereiding voor het Atlas experiment bij de LHC.
2005- hoogleraar aan de UvA ‘Collider physics at the LHC
Huidige werkzaamheden
Verantwoordelijk voor het FOM programma ‘Exploration of new phenomena at the highest energy frontier with D0 and ATLAS’ bij het Nikhef
Directeur van het Instituut voor Hoge Energie Fysica aan de FNWI
Onderwijs
Speciale Relativiteitstheorie voor eerste jaars Bachelors
Elementaire deeltjes fysica voor Bacherors
Caput elementaire deeltjes Master
Overige activiteiten
2005-2007 Convenor van de top-quark fysica groep in Atlas
2007 VICI award ‘BeyondtheTop; a new era in particle physics’
2005- Lid van de KNAW Cern Contact Commissie

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