Le boson de Higgs

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Elles se d茅pla莽aient 脿 la vitesse de la lumi猫re.<br> Si les 茅toiles, les plan猫tes et la vie ont pu 茅merger, c鈥檈st parce que les particules ont acquis une masse gr芒ce au champ de Higgs.<br> L鈥檈xistence de ce champ a 茅t茅 confirm茅e en 2012, par la d茅couverte au CERN du boson de Higgs qui lui est associ茅.</p> </span> </div> <div class="background__veil"></div> <div class="background-component background__image" style="background:url('/sites/default/files/2022-06/Artboard%201-100.jpg') no-repeat center top / cover; height: 100%;"></div> </div> </div> <span class="component-header__scroll"></span> </div> <a class="endof-cern-header-blocks"></a> </div> </div> </div> </div> </div> <div class="field--item"> <div class="component-row component-row__display__fluid section-navigation effect_none"> <div class="background-component background__color" style="background-color:rgba(0,0,0,1); height: 100%;"></div> <div class="component-row__row"> <div class="component-row__column component-row__center 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id="preview-card--9" class="component-preview-cards box-pattern simple-display story_page" style="background:url('//cds.cern.ch/images/ATLAS-PHO-EVENTS-2012-007-1/file?size=medium') no-repeat center center / cover" data-background="//cds.cern.ch/images/ATLAS-PHO-EVENTS-2012-007-1/file?size=medium" class="component-preview-cards box-pattern simple-display story_page"> <a class="box-link" target="" href="/fr/science/physics/higgs-boson/how"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3><a href="/fr/science/physics/higgs-boson/how" title="Comment a-t-on d茅couvert le boson de Higgs ?"> <span style="color:"> Comment a-t-on d茅couvert le boson de Higgs ? </span> </a></h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> </div> </div> </div> </div> <div id="preview-card--10" class="component-preview-cards box-pattern 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style="background:url('//cds.cern.ch/images/OPEN-PHO-ACCEL-2015-001-1/file?size=medium') no-repeat center center / cover" data-background="//cds.cern.ch/images/OPEN-PHO-ACCEL-2015-001-1/file?size=medium" class="component-preview-cards box-pattern simple-display story_page"> <a class="box-link" target="" href="/fr/science/physics/higgs-boson/future"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3><a href="/fr/science/physics/higgs-boson/future" title="Qu'allons-nous chercher ensuite ?"> <span style="color:"> Qu'allons-nous chercher ensuite ? </span> </a></h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> </div> </div> </div> </div> <div id="preview-card--12" class="component-preview-cards box-pattern simple-display story_page" style="background:url('/sites/default/files/2022-07/668454536_b0ec8bf7ee_b_1.jpg') no-repeat center center / cover" data-background="/sites/default/files/2022-07/668454536_b0ec8bf7ee_b_1.jpg" class="component-preview-cards box-pattern simple-display story_page"> <a class="box-link" target="" href="/fr/science/physics/higgs-boson/why"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3><a href="/fr/science/physics/higgs-boson/why" title="Le boson de Higgs dans notre vie"> <span style="color:"> Le boson de Higgs dans notre vie </span> </a></h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> </div> </div> </div> </div> <div id="preview-card--13" class="component-preview-cards box-pattern simple-display story_page" style="background:url('//cds.cern.ch/images/CERN-HOMEWEB-PHO-2012-001-1/file?size=medium') no-repeat center center / cover" data-background="//cds.cern.ch/images/CERN-HOMEWEB-PHO-2012-001-1/file?size=medium" class="component-preview-cards box-pattern simple-display story_page"> <a class="box-link" target="" href="/fr/news/series/higgs10"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3><a href="/fr/news/series/higgs10" title="La s茅rie Higgs10"> <span style="color:"> La s茅rie Higgs10 </span> </a></h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Les histoires derri猫re la d茅couverte </div> </div> </div> </div> </div> <div class="component-media-content box-pattern simple-display image" style="background-image:url('//cds.cern.ch/images/CMS-PHO-EVENTS-2012-005-1/file?size=medium'); background-repeat: no-repeat; background-position: center center; background-size: cover; background-color: ;"> <a class="box-link" target="" href="/fr/resources/image/physics/higgs-collection-images-gallery"></a> <div class="component-media-content__veil"></div> <div class="component-media-content__wrapper"> <div class="component-media-content__subwrapper"> <div class="component-media-content__icon"> <div class="type_video">video</div> <div class="type_image">image</div> </div> <div class="component-media-content__title"> <h3> <a href="/fr/resources/image/physics/higgs-collection-images-gallery" title="Images de la collection Higgs"> <span class="text-color" > Images de la collection Higgs </span> </a> </h3> </div> </div> </div> </div> <div class="component-media-content box-pattern simple-display video" style="background-image:url('//cds.cern.ch/images/CERN-HI-1207136-101/file?size=medium'); background-repeat: no-repeat; background-position: center center; background-size: cover; background-color: ;"> <a class="box-link" target="" href="/fr/resources?title=&topic=All&type=61&audience=All&field_p_resource_display_tags_target_id%5B0%5D%5Btarget_id%5D=102&date_from=&date_to=&page=0"></a> <div class="component-media-content__veil"></div> <div class="component-media-content__wrapper"> <div class="component-media-content__subwrapper"> <div class="component-media-content__icon"> <div class="type_video">video</div> <div class="type_image">image</div> </div> <div class="component-media-content__title"> <h3> <a href="/fr/resources?title=&topic=All&type=61&audience=All&field_p_resource_display_tags_target_id%5B0%5D%5Btarget_id%5D=102&date_from=&date_to=&page=0" title="Vid茅os de la collection Higgs"> <span class="text-color" > Vid茅os de la collection Higgs </span> </a> </h3> </div> </div> </div> </div> <div id="preview-card--14" class="component-preview-cards box-pattern simple-display story_page" style="background:url('//cds.cern.ch/images/ATLAS-PHO-COLLAB-2012-011-1/file?size=medium') no-repeat center center / cover" data-background="//cds.cern.ch/images/ATLAS-PHO-COLLAB-2012-011-1/file?size=medium" class="component-preview-cards box-pattern simple-display story_page"> <a class="box-link" target="" href="/fr/resources/faqs/five-sigma"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3><a href="/fr/resources/faqs/five-sigma" title="Vous avez dit 芦 cinq sigmas 禄 ?"> <span style="color:"> Vous avez dit 芦 cinq sigmas 禄 ? </span> </a></h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> </div> </div> </div> </div> </div> </div> </div> </div> </div> <div class="field--item"> <div class="component-row component-row__display__fluid section-navigation effect_none"> <div class="component-row__row"> <div class="component-row__column component-row__center section-has-no-column col-md-12 col-sm-12 col-xs-12"> <div class="box-effects-wrapper "> <div class="component-division" style="background:url('//cds.cern.ch/images/OPEN-PHO-ACCEL-2013-052-1/file?size=medium') no-repeat center center / cover"> <div class="component-division__text"> <div class="component-division__text__link"> <a href="/fr/science/physics/higgs-boson/what" title="Qu鈥檈st-ce que le boson de Higgs ?"> <span>Qu鈥檈st-ce que le boson de Higgs ?</span> </a> </div> <div class="component-division__text__text"> <span><p>Dans la description actuelle de la nature, chaque particule est une onde dans un champ. Par exemple, la lumi猫re est 脿 la fois une onde dans le champ 茅lectromagn茅tique et un flux de particules appel茅es 芦 photons 禄.</p> <p>Pour le boson de Higgs, le champ est apparu en premier. Dans l鈥檋ypoth猫se propos茅e en 1964, il s鈥檃gissait d鈥檜n nouveau type de champ pr茅sent dans tout l鈥橴nivers et donnant une masse 脿 toutes les particules 茅l茅mentaires. Le boson de Higgs est une onde 脿 l鈥檌nt茅rieur de ce champ. La d茅couverte du boson confirme l鈥檈xistence du champ de Higgs.</p> </span> </div> </div> </div> <div class="component-division topright" style="background:url('//cds.cern.ch/images/OPEN-PHO-CHART-2015-001-1/file?size=large') no-repeat center center / cover"> <div class="component-division__text"> <div class="component-division__text__link"> <a href="/fr/science/physics/higgs-boson/what#BEH" title="Comment les particules acqui猫rent-elles une masse ?"> <span>Comment les particules acqui猫rent-elles une masse ?</span> </a> </div> <div class="component-division__text__text"> <span><p>Les particules acqui猫rent une masse lors de leur interaction avec le champ de Higgs. Plus l鈥檌nteraction est forte, plus la particule est massive. Les photons, par exemple, n鈥檌nteragissent pas avec ce champ : ils n鈥檕nt pas de masse. D鈥檃utres particules 茅l茅mentaires interagissent avec ce champ, et sont donc dot茅es de masses diverses.</p> <p>Ce ph茅nom猫ne par lequel les particules acqui猫rent une masse est appel茅芦 m茅canisme de Brout-Englert-Higgs 禄, du nom de trois th茅oriciens, Robert Brout, Fran莽ois Englert et Peter Higgs.</p> </span> </div> </div> </div> <div class="component-division" style="background:url('//cds.cern.ch/images/CMS-PHO-EVENTS-2013-003-1/file?size=large') no-repeat center center / cover"> <div class="component-division__text"> <div class="component-division__text__link"> <a href="/fr/science/physics/higgs-boson/how" title="Comment a-t-on d茅couvert le boson de Higgs ?"> <span>Comment a-t-on d茅couvert le boson de Higgs ?</span> </a> </div> <div class="component-division__text__text"> <span><p>On ne peut pas 芦 trouver 禄 le boson de Higgs quelque part. Il doit 锚tre produit au cours d鈥檜ne collision de particules puis se d茅sint茅grer en d鈥檃utres particules qui peuvent alors 锚tre identifi茅es dans des d茅tecteurs.</p> <p>Les traces de ces particules se trouvent dans les donn茅es collect茅es. La difficult茅, c鈥檈st que ces particules peuvent 锚tre issues d'autres processus, alors que le boson de Higgs n鈥檃ppara卯t qu鈥檃u cours d鈥檜ne collision sur un milliard au LHC. C鈥檈st l鈥檃nalyse minutieuse d鈥櫭﹏ormes quantit茅s de donn茅es qui a permis en 2012 de rep茅rer le faible signal de la particule.</p> </span> </div> </div> </div> <div class="component-division topright" style="background:url('//cds.cern.ch/images/CERN-HI-1207136-58/file?size=large') no-repeat center center / cover"> <div class="component-division__text"> <div class="component-division__text__link"> <a href="/fr/science/physics/higgs-boson/ten-years" title="Comment a-t-on su que c鈥櫭﹖ait le Higgs ?"> <span>Comment a-t-on su que c鈥櫭﹖ait le Higgs ?</span> </a> </div> <div class="component-division__text__text"> <span><p>Le 4 juillet 2012, ATLAS et CMS annon莽aient au CERN la d茅couverte d'une nouvelle particule.</p> <p>Une particule sans charge 茅lectrique, 脿 dur茅e de vie courte et se d茅sint茅grant comme le pr茅voyait la th茅orie pour le boson de Higgs. Il fallait encore v茅rifier son 芦 spin 禄, le boson de Higgs 茅tant la seule particule 脿 avoir un spin nul.</p> <p>En examinant deux fois et demie plus de donn茅es, ils ont conclu en mars 2013 qu'un type de boson de Higgs avait effectivement 茅t茅 d茅couvert. </p> </span> </div> </div> </div> <div class="component-division" style="background:url('//cds.cern.ch/images/CERN-HOMEWEB-PHO-2022-026-1/file?size=large') no-repeat center center / cover"> <div class="component-division__text"> <div class="component-division__text__link"> <a href="/fr/science/physics/higgs-boson/ten-years" title="Qu鈥檃vons-nous appris depuis ?"> <span>Qu鈥檃vons-nous appris depuis ?</span> </a> </div> <div class="component-division__text__text"> <span><p>La d茅couverte du boson de Higgs n'茅tait qu鈥檜n d茅but. Au cours des dix ann茅es suivantes, les physiciens ont 茅tudi茅 son interaction avec d'autres particules.</p> <p>La force de l'interaction peut 锚tre mesur茅e exp茅rimentalement en observant la production et la d茅sint茅gration des bosons de Higgs : plus une particule est lourde, plus il est probable qu鈥檈lle intervienne dans un tel processus. En 2016, on a d茅couvert l鈥檌nteraction du boson de Higgs avec le lepton tau et en 2018 avec les quarks top et bottom. </p> <p>Mais il nous reste encore beaucoup 脿 apprendre.</p> </span> </div> </div> </div> <div class="component-division topright" style="background:url('//cds.cern.ch/images/OPEN-PHO-ACCEL-2015-001-1/file?size=large') no-repeat center center / cover"> <div class="component-division__text"> <div class="component-division__text__link"> <a href="/fr/science/physics/higgs-boson/future" title="La suite de l鈥檃venture"> <span>La suite de l鈥檃venture</span> </a> </div> <div class="component-division__text__text"> <span><p>Dix ans apr猫s sa d茅couverte, il nous reste beaucoup 脿 apprendre sur le boson de Higgs.</p> <p>Est-il unique en son genre, ou existe-t-il tout un secteur de Higgs ? Va-t-on, gr芒ce 脿 lui, comprendre pourquoi, dans la formation de l鈥橴nivers, la mati猫re a pr茅valu sur l'antimati猫re ? Obtient-il sa masse en interagissant avec lui-m锚me ? Et pourquoi sa masse est-elle si faible, faut-il supposer un m茅canisme enti猫rement nouveau ?</p> <p>La mati猫re noire et d'autres nouvelles particules pourraient-elles 锚tre r茅v茅l茅es gr芒ce 脿 des interactions avec le boson de Higgs ?</p> </span> </div> </div> </div> <div class="component-division" style="background:url('/sites/default/files/2022-07/668454536_b0ec8bf7ee_b.jpg') no-repeat center center / cover"> <div class="component-division__text"> <div class="component-division__text__link"> <a href="/fr/science/physics/higgs-boson/why" title="Quel est l鈥檌mpact du boson de Higgs sur nos vies ?"> <span>Quel est l鈥檌mpact du boson de Higgs sur nos vies ?</span> </a> </div> <div class="component-division__text__text"> <span><p>Le boson de Higgs a un impact sur notre quotidien, et vous ne le soup莽onnez peut-锚tre pas.</p> <p>Il nous donne une cl茅 pour r茅pondre 脿 nos questions sur l鈥橴nivers et son 茅volution : pourquoi avons-nous une masse, comme toute la mati猫re qui nous entoure ?</p> <p>Pour rechercher cette particule, les technologies des acc茅l茅rateurs et des d茅tecteurs ont 茅t茅 pouss茅es 脿 leurs limites, ce qui a permis des avanc茅es dans de nombreux domaines, comme celui de la sant茅 ou de l'a茅rospatiale, pour ne citer que ces exemples.</p> </span> </div> </div> </div> </div> </div> </div> </div> </div> <div class="field--item"> </div> <div class="field--item"> <div class="component-row component-row__display__fluid section-navigation effect_none"> <div class="component-row__row"> <div class="component-row__column component-row__center section-has-no-column col-md-12 col-sm-12 col-xs-12"> <div class="box-effects-wrapper "> <div class="views-element-container form-group"> <div class="horizontal-boxes view view-news-microviews view-id-news_microviews view-display-id-block_14 js-view-dom-id-9234d442c6ddc1974ee0ab5c02617cfe765122611528098300c53ed8f96d2bb6 cern-view-display-block cern-view-display-block_14 clearfix"> <h1 class="mb-3 mt-3 text-center">Derni猫res nouvelles 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