Editing Bottom quark (section)

{{Short description|Type of quark}}
{{Use dmy dates|date=December 2020}}
{{Infobox particle
| image            =
| caption          =
| num_types        =
| composition      = [[elementary particle]]
| statistics       = [[fermion]]ic
| group            = [[quark]]
| generation       = third
| interaction      = [[Strong interaction|strong]], [[Weak interaction|weak]], [[Electromagnetic interaction|electromagnetic]], [[gravity]]
| particle         =
| antiparticle     = bottom antiquark ({{Subatomic particle|bottom antiquark}})
| theorized        = [[Makoto Kobayashi (physicist)|Makoto Kobayashi]] and [[Toshihide Maskawa]] (1973)<ref name="KM" />
| discovered       = [[Leon M. Lederman]] et al. (1977)<ref name="FermiPress1977">
{{cite press release
 |date=7 August 1977
 |title=Discoveries at Fermilab – Discovery of the Bottom Quark
 |url=http://www.fnal.gov/pub/inquiring/physics/discoveries/bottom_quark_pr.html
 |publisher=[[Fermilab]]
 |access-date=2009-07-24
}}</ref>
| symbol           = {{Subatomic particle|bottom quark}}
| mass             = {{val|4.18|+0.04|-0.03|ul=GeV/c2}} ([[Minimal subtraction scheme|{{overline|MS}} scheme]])<ref name="PDG2018">
{{cite journal
 |author=M. Tanabashi et al. (Particle Data Group)
 |title=Review of Particle Physics
 |year= 2018
 |doi=10.1103/PhysRevD.98.030001
 |volume=98
 |issue=3
 |pages=030001
 |journal=Physical Review D
 |url=http://pdglive.lbl.gov/DataBlock.action?node=Q005M
 |doi-access=free
 |bibcode=2018PhRvD..98c0001T
 |hdl=10044/1/68623
 |hdl-access=free
}}</ref>{{br}}{{val|4.65|+0.03|-0.03|ul=GeV/c2}} ([[1S scheme]])<ref name="PDG2012">
{{cite web
 |author=J. Beringer ([[Particle Data Group]])
 |url=http://pdg.lbl.gov/2012/tables/rpp2012-sum-quarks.pdf
 |title=PDGLive Particle Summary 'Quarks (u, d, s, c, b, t, b′, t′, Free)'
 |publisher=[[Particle Data Group]]
 |year=2012
 |access-date=2012-12-18
 |display-authors=etal
 |archive-url=https://web.archive.org/web/20130512010447/http://pdg.lbl.gov/2012/tables/rpp2012-sum-quarks.pdf
 |archive-date=12 May 2013
 |url-status=dead
}}</ref>
| decay_time       =
| decay_particle   = [[charm quark]] or<br/>[[up quark]]
| electric_charge  = −{{sfrac| 1 |3}}&nbsp;[[Elementary charge|''e'']]
| color_charge     = yes
| spin             = {{sfrac| 1 |2}}&nbsp;[[reduced Planck constant|''ħ'']]
| num_spin_states  =
| weak_isospin     = {{nowrap|[[Chirality (physics)|LH]]: {{sfrac|−| 1 |2}}, [[Chirality (physics)|RH]]: 0}}
| weak_hypercharge = {{nowrap|[[Chirality (physics)|LH]]: {{sfrac| 1 |3}}, [[Chirality (physics)|RH]]: {{sfrac|−| 2 |3}}}}
}}

The '''bottom quark''', '''beauty quark''', or '''b quark''', is an [[elementary particle]] of the third [[Generation (particle physics)|generation]]. It is a heavy [[quark]] with a charge of −{{sfrac|3}}&nbsp;[[elementary charge|''e'']].

All quarks are described in a similar way by [[electroweak interaction]] and [[quantum chromodynamics]], but the bottom quark has exceptionally low rates of transition to lower-mass quarks. The bottom quark is also notable because it is a product in almost all [[top quark]] decays, and is a frequent decay product of the [[Higgs boson]].