New particles discovered at the LHC

New fundamental particles

ExperimentParticleMassDateReferenceNote
CMS$\rm Higgs\ Boson$$125.3\pm0.7$ GeV31 Jul 2012Phys. Lett. B716 (2012) 30
ATLAS$\rm Higgs\ Boson$$126.0\pm0.6$ GeV31 Jul 2012Phys. Lett. B716 (2012) 1

So far 1 fundamental particle has been discovered at the LHC.

New hadrons

ExperimentParticleMassQuarksDateReferenceNote
LHCb$T_{c\bar{c}c\bar{c}}$$6905\pm13$ MeV$c\bar{c}c\bar{c}$30 Jun 2020arXiv:2006.16957Mass for one of the fits.
LHCb$\Xi_c(2923)^0$$2923.0\pm0.3$ MeV$csd$30 Mar 2020arXiv:2003.13649
LHCb$\Xi_c(2939)^0$$2939.6\pm0.3$ MeV$csd$30 Mar 2020arXiv:2003.13649
LHCb$\Lambda_b(6070)^0$$6072.3\pm3.0$ MeV$bud$12 Feb 2020arXiv:2002.05112
LHCb$\Omega_b(6340)^-$$6339.7\pm0.6$ MeV$bss$03 Jan 2020Phys. Rev. Lett. 124 (2020) 082002
LHCb$\Omega_b(6350)^-$$6449.9\pm0.6$ MeV$bss$03 Jan 2020Phys. Rev. Lett. 124 (2020) 082002
LHCb$\Lambda_b(6146)^0$$6146.2\pm0.4$ MeV$bud$31 Jul 2019Phys. Rev. Lett. 123 (2019) 152001
LHCb$\Lambda_b(6152)^0$$6152.5\pm0.4$ MeV$bud$31 Jul 2019Phys. Rev. Lett. 123 (2019) 152001
LHCb$P_c(4312)^+$$4312\,^{+\,7}_{-\,1}$ MeV$c\bar{c}uud$08 Apr 2019Phys. Rev. Lett. 122 (2019) 222001
LHCb$P_c(4440)^+$$4440\pm5$ MeV$c\bar{c}uud$08 Apr 2019Phys. Rev. Lett. 122 (2019) 222001Resolves $P_c(4450)^+$
LHCb$P_c(4457)^+$$4457\,^{+\,4}_{-\,2}$ MeV$c\bar{c}uud$08 Apr 2019Phys. Rev. Lett. 122 (2019) 222001Resolves $P_c(4450)^+$
LHCb$X(3842)$$3842.7\pm0.2$ MeV$c\bar{c} (q\bar{q}?)$28 Mar 2019JHEP 1907 (2019) 035
CMS$B_c(2S)^+$$6871.0\pm1.6$ MeV$\bar{b}c$01 Feb 2019Phys. Rev. Lett. 122 (2019) 132001Resolves $B_c(2S)^+$ (ATLAS). See 1.
CMS$B_c^{*}(2S)^+$Undetermined$\bar{b}c$01 Feb 2019Phys. Rev. Lett. 122 (2019) 132001Resolves $B_c(2S)^+$ (ATLAS). See 1.
LHCb$\Sigma_b(6097)^+$$6098.0\pm1.8$ MeV$buu$20 Sep 2018Phys. Rev. Lett. 122 (2019) 012001
LHCb$\Sigma_b(6097)^-$$6095.8\pm1.8$ MeV$bdd$20 Sep 2018Phys. Rev. Lett. 122 (2019) 012001
LHCb$Z_c(4100)^-$$4096\pm28$ MeV$c\bar{c}d\bar{u}$19 Sep 2018Eur. Phys. J. C78 (2018) 1019
LHCb$\Xi_{cc}^{++}$$3621.4\pm0.8$ MeV$ccu$06 Jul 2017Phys. Rev. Lett. 119 (2017) 112001Weakly decaying
LHCb$\Omega_c(3000)^0$$3000.4\,^{+\,0.4}_{-\,0.5}$ MeV$css$14 May 2017Phys. Rev. Lett. 118 (2017) 182001
LHCb$\Omega_c(3050)^0$$3050.2\,^{+\,0.3}_{-\,0.5}$ MeV$css$14 May 2017Phys. Rev. Lett. 118 (2017) 182001
LHCb$\Omega_c(3066)^0$$3065.6\,^{+\,0.4}_{-\,0.6}$ MeV$css$14 May 2017Phys. Rev. Lett. 118 (2017) 182001
LHCb$\Omega_c(3090)^0$$3090.2\,^{+\,0.7}_{-\,0.8}$ MeV$css$14 May 2017Phys. Rev. Lett. 118 (2017) 182001
LHCb$\Omega_c(3119)^0$$3119.1\,^{+\,1.0}_{-\,1.1}$ MeV$css$14 May 2017Phys. Rev. Lett. 118 (2017) 182001
LHCb$X(4274)$$4147\,^{+\,6}_{-\,5}$ MeV$c\bar{c}s\bar{s}$25 Jun 2017Phys. Rev. Lett. 118 (2017) 022003
LHCb$X(4500)$$4506\,^{+\,16}_{-\,18}$ MeV$c\bar{c}s\bar{s}$25 Jun 2017Phys. Rev. Lett. 118 (2017) 022003
LHCb$X(4700)$$4704\,^{+\,17}_{-\,26}$ MeV$c\bar{c}s\bar{s}$25 Jun 2017Phys. Rev. Lett. 118 (2017) 022003
LHCb$P_c(4450)^+$$4449.8\pm3.0$ MeV$c\bar{c}uud$13 Jul 2015Phys. Rev. Lett. 115 (2015) 072001Later resolved into $P_c(4440)^+$ and $P_c(4457)^+$
LHCb$P_c(4380)^+$$4380\pm30$ MeV$c\bar{c}uud$13 Jul 2015Phys. Rev. Lett. 115 (2015) 072001
LHCb$B_J(5840)^+$$5851\pm19$ MeV$\bar{b}u$09 Feb 2015JHEP 1504 (2015) 024A state at 5960 is seen, which could be the $B_J(5970)$ seen by CDF. Also evidence for neutral states.
LHCb$\Xi_b^{'-}$$5935.0\pm0.5$ MeV$bsd$18 Nov 2014Phys. Rev. Lett. 114 (2015) 062004
LHCb$\Xi_b^{*-}$$5955.3\pm0.5$ MeV$bsd$18 Nov 2014Phys. Rev. Lett. 114 (2015) 062004
LHCb$D_{s3}(2860)^-$$2860\pm6$ MeV$c\bar{s}$28 Jul 2014Phys. Rev. Lett. 113 (2014) 162001Previoulsy known $D_{s}(2860)^-$ resolved into spin-1 and 3 states
ATLAS$B_c(2S)^+$$6842\pm7$ MeV$\bar{b}c$04 Jul 2014Phys. Rev. Lett. 113 (2014) 212004Resolved into two states by CMS
CMS$X(4140)$$4148\pm7$ MeV$c\bar{c}s\bar{s}$26 Sep 2013Phys. Lett. B 734 (2014) 261Confirmed by LHCb in 2016
LHCb$\Lambda_b(5912)^0$$5912.0\pm0.7$ MeV$bud$15 May 2012Phys. Rev. Lett. 109 (2012) 172003
LHCb$\Lambda_b(5920)^0$$5912.0\pm0.7$ MeV$bud$15 May 2012Phys. Rev. Lett. 109 (2012) 172003
CMS$\Xi_b^{*0}$$5945\pm3$ MeV$bsu$26 Apr 2012Phys. Rev. Lett. 108 (2012) 252002
ATLAS$\chi_b(3P)$$10.53\pm0.01$ GeV$b\bar{b}$21 Dec 2011Phys. Rev. Lett. 108 (2012) 152001

So far 37 hadrons have been discovered at the LHC, of which 31 by LHCb



Resonances per year


Resonances versus time


Masses and discovery dates

Only first observations of particles with $5\sigma$ significance are listed. $q$ stands for $u$ or $d$. If a peak is observed and later resolved into several components, both papers are listed but particles are not double counted.

Notes:

1. Two peaks are observed. One is the $B_c(2S)^+$, the other likely the partially-reconstructed $B_c^*(2S)^+$. Which one is which is yet unclear.

Please report mistakes and omissions.