New particles discovered at the LHC

New fundamental particles

CounterExperimentParticleMass [GeV]DateReferenceNote
1.ATLAS$\sf Higgs\ Boson$$126.0\pm0.6$31 Jul 2012Phys. Lett. B716 (2012) 1
1.CMS$\sf Higgs\ Boson$$125.3\pm0.7$31 Jul 2012Phys. Lett. B716 (2012) 30

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

New hadrons

CounterExperimentParticleMass [MeV]QuarksDateReferenceNote
1.ATLAS$\chi_b(3P)$$10530\pm10$$b\bar{b}$21 Dec 2011Phys. Rev. Lett. 108 (2012) 152001Later resolved into $\chi_{b1}(3P)$ and $\chi_{b2}(3P)$
2.CMS$\Xi_b^{*0}$$5945\pm3$$bsu$26 Apr 2012Phys. Rev. Lett. 108 (2012) 252002
3.LHCb$\Lambda_b(5920)^0$$5919.8\pm0.7$$bud$15 May 2012Phys. Rev. Lett. 109 (2012) 172003
4.LHCb$\Lambda_b(5912)^0$$5912.0\pm0.7$$bud$15 May 2012Phys. Rev. Lett. 109 (2012) 172003
5-6.LHCb$D_J^*(3000)^{+,0}$$3008\pm4$$c\bar{q}$17 Jul 2013JHEP 09 (2013) 145Mass of $+$ state fixed in fit
7.LHCb$D_J(3000)^0$$2972\pm9$$c\bar{u}$17 Jul 2013JHEP 09 (2013) 145
8.LHCb$D_J^*(2760)^+$$2772\pm4$$c\bar{d}$17 Jul 2013JHEP 09 (2013) 145
9.LHCb$D_J(2740)^0$$2737\pm12$$c\bar{u}$17 Jul 2013JHEP 09 (2013) 145
10.LHCb$D_J(2580)^0$$2580\pm6$$c\bar{u}$17 Jul 2013JHEP 09 (2013) 145
11.CMS$X(4140)$$4148\pm7$$c\bar{c}s\bar{s}$26 Sep 2013Phys. Lett. B 734 (2014) 261
12.ATLAS$B_c(2S)^+$$6842\pm6$$\bar{b}c$03 Jul 2014Phys. Rev. Lett. 113 (2014) 212004Later resolved into two states.
13.LHCb$D_{s1}^*(2860)^+$$2859\pm27$$c\bar{s}$28 Jul 2014Phys. Rev. Lett. 113 (2014) 162001Resolves $D_{sJ}(2860)^+$. See Note c.
14.LHCb$\Xi_b^{*-}$$5955.3\pm0.5$$bsd$18 Nov 2014Phys. Rev. Lett. 114 (2015) 062004
15.LHCb$\Xi_b^{'-}$$5935.0\pm0.5$$bsd$18 Nov 2014Phys. Rev. Lett. 114 (2015) 062004
16-17.LHCb$B_J(5970)^{+,0}$$5969\pm6$$\bar{b}q$09 Feb 2015JHEP 1504 (2015) 024See Note b.
18-19.LHCb$B_J(5840)^{+,0}$$5863\pm9$$\bar{b}q$09 Feb 2015JHEP 1504 (2015) 024See Note b.
20.LHCb$P_c(4450)^+$$4449.8\pm3.0$$c\bar{c}uud$13 Jul 2015Phys. Rev. Lett. 115 (2015) 072001Later resolved into $P_c(4440)^+$ and $P_c(4457)^+$.
21.LHCb$P_c(4380)^+$$4380\pm30$$c\bar{c}uud$13 Jul 2015Phys. Rev. Lett. 115 (2015) 072001
22.LHCb$X(4700)$$4704\,^{+\,17}_{-\,26}$$c\bar{c}s\bar{s}$25 Jun 2016Phys. Rev. Lett. 118 (2017) 022003See Note d.
23.LHCb$X(4500)$$4506\,^{+\,16}_{-\,19}$$c\bar{c}s\bar{s}$25 Jun 2016Phys. Rev. Lett. 118 (2017) 022003
24.LHCb$X(4274)$$4273\,^{+\,19}_{-\,9}$$c\bar{c}s\bar{s}$25 Jun 2016Phys. Rev. Lett. 118 (2017) 022003
25.LHCb$D_3^*(2760)^0$$2776\pm8$$c\bar{u}$03 Aug 2016Phys. Rev. D 94 (2016) 072001
26.LHCb$\Lambda_c(2860)^+$$2856\,^{+\,2}_{-\,6}$$cud$26 Jan 2017JHEP 05 (2017) 30
27.LHCb$\Omega_c(3119)^0$$3119.1\,^{+\,1.0}_{-\,1.1}$$css$14 Mar 2017Phys. Rev. Lett. 118 (2017) 182001
28.LHCb$\Omega_c(3090)^0$$3090.2\,^{+\,0.7}_{-\,0.8}$$css$14 Mar 2017Phys. Rev. Lett. 118 (2017) 182001
29.LHCb$\Omega_c(3066)^0$$3065.6\,^{+\,0.4}_{-\,0.6}$$css$14 Mar 2017Phys. Rev. Lett. 118 (2017) 182001
30.LHCb$\Omega_c(3050)^0$$3050.2\,^{+\,0.3}_{-\,0.5}$$css$14 Mar 2017Phys. Rev. Lett. 118 (2017) 182001
31.LHCb$\Omega_c(3000)^0$$3000.4\,^{+\,0.4}_{-\,0.5}$$css$14 Mar 2017Phys. Rev. Lett. 118 (2017) 182001
32.LHCb$\Xi^{++}_{cc}$$3621.4\pm0.8$$ccu$06 Jul 2017Phys. Rev. Lett. 119 (2017) 112001Weakly decaying
33.LHCb$\Xi_b(6227)^-$$6226.9\pm2.0$$bsd$23 May 2018Phys. Rev. Lett. 121 (2018) 072002
34.CMS$\chi_{b2}(3P)$$10524.0 \pm 0.6$$b\bar{b}$28 May 2018Phys. Rev. Lett. 121 (2018) 092002Resolves $\chi_{b}(3P)$.
CMS$\chi_{b1}(3P)$$10513.4 \pm 0.4$$b\bar{b}$28 May 2018Phys. Rev. Lett. 121 (2018) 092002Resolves $\chi_{b}(3P)$.
35.LHCb$\Sigma_b(6097)^-$$6095.8\pm1.8$$bdd$20 Sep 2018Phys. Rev. Lett. 122 (2019) 012001
36.LHCb$\Sigma_b(6097)^+$$6098.0\pm1.8$$buu$20 Sep 2018Phys. Rev. Lett. 122 (2019) 012001
37.CMS$B_c^{*}(2S)^+$Undetermined$\bar{b}c$01 Feb 2019Phys. Rev. Lett. 122 (2019) 132001Resolves $B_c(2S)^+$ (ATLAS). See Note a.
CMS$B_c(2S)^+$$6871.0\pm1.6$$\bar{b}c$01 Feb 2019Phys. Rev. Lett. 122 (2019) 132001Resolves $B_c(2S)^+$ (ATLAS). See Note a.
38.LHCb$X(3842)$$3842.7\pm0.2$$c\bar{c} (q\bar{q}?)$28 Mar 2019JHEP 1907 (2019) 035
39.LHCb$P_c(4457)^+$$4457\,^{+\,4}_{-\,2}$$c\bar{c}uud$08 Apr 2019Phys. Rev. Lett. 122 (2019) 222001Resolves $P_c(4450)^+$.
LHCb$P_c(4440)^+$$4440\,^{+\,4}_{-\,5}$$c\bar{c}uud$08 Apr 2019Phys. Rev. Lett. 122 (2019) 222001Resolves $P_c(4450)^+$.
40.LHCb$P_c(4312)^+$$4312\,^{+\,7}_{-\,1}$$c\bar{c}uud$08 Apr 2019Phys. Rev. Lett. 122 (2019) 222001
41.LHCb$\Lambda_b(6152)^0$$6152.5\pm0.4$$bud$31 Jul 2019Phys. Rev. Lett. 123 (2019) 152001
42.LHCb$\Lambda_b(6146)^0$$6146.2\pm0.4$$bud$31 Jul 2019Phys. Rev. Lett. 123 (2019) 152001
43.LHCb$\Omega_b(6350)^-$$6349.9\pm0.6$$bss$03 Jan 2020Phys. Rev. Lett. 124 (2020) 082002
44.LHCb$\Omega_b(6340)^-$$6339.7\pm0.6$$bss$03 Jan 2020Phys. Rev. Lett. 124 (2020) 082002
45.LHCb$\Lambda_b(6070)^0$$6072.3\pm3.0$$bud$12 Feb 2020JHEP 06 (2020) 136
46.LHCb$\Xi_c(2939)^0$$2938.55\pm0.30$$csd$30 Mar 2020Phys. Rev. Lett. 124 (2020) 222001
47.LHCb$\Xi_c(2923)^0$$2923.04\pm0.35$$csd$30 Mar 2020Phys. Rev. Lett. 124 (2020) 222001
48.LHCb$X(6900)$$6905\pm13$$c\bar{c}c\bar{c}$30 Jun 2020Science Bulletin 2020 65(23) 1983Mass for one of the fits.
49.LHCb$X_1(2900)$$2904\pm5$$\bar{c}d\bar{s}u$31 Aug 2020Phys. Rev. D 102 (2020) 112003
50.LHCb$X_0(2900)$$2866\pm7$$\bar{c}d\bar{s}u$31 Aug 2020Phys. Rev. D 102 (2020) 112003
51.LHCb$\Xi_b(6227)^0$$6227.1\,^{+\,1.5}_{-\,1.6}$$bsu$27 Oct 2020Phys. Rev. D103 (2021) 012004Isospin partner of $\Xi_b(6227)^-$
52.LHCb$B_s(6114)^0$$6114\pm6$$\bar{b}s$29 Oct 2020arXiv:2010.15931
53.LHCb$B_s(6063)^0$$6063.5\pm1.4$$\bar{b}s$29 Oct 2020arXiv:2010.15931
54.LHCb$D_{s0}(2590)^+$$2591\pm9$$c\bar{s}$18 Nov 2020Phys. Rev. Lett. 126 (2021) 122002
55.CMS$\Xi_b(6100)^-$$6100.3\pm0.6$$bsd$08 Feb 2021Phys. Rev. Lett. 126 (2021) 252003
56.LHCb$X(4685)$$4684\,^{+\,15}_{-\,17}$$c\bar{c}s\bar{s}$02 Mar 2021arXiv:2103.01803
57.LHCb$X(4630)$$4630\,^{+\,20}_{-\,110}$$c\bar{c}s\bar{s}$02 Mar 2021arXiv:2103.01803
58.LHCb$Z_{cs}(4220)^+$$4220\,^{+\,50}_{-\,40}$$c\bar{c}u\bar{s}$02 Mar 2021arXiv:2103.01803
59.LHCb$Z_{cs}(4000)^+$$4003\,^{+\,7}_{-\,15}$$c\bar{c}u\bar{s}$02 Mar 2021arXiv:2103.01803See Note e.
60.LHCb$\Xi_b(6333)^0$$6332.7\pm0.3$$bsu$29 Jul 2021Preliminary
61.LHCb$\Xi_b(6327)^0$$6327.3\pm0.3$$bsu$29 Jul 2021Preliminary
62.LHCb$T_{cc}^+$$3870.01\pm0.12$$cc\bar{u}\bar{d}$29 Jul 2021Preliminary

So far 62 hadrons have been discovered at the LHC, of which 55 by LHCb



Number of new hadrons per year.
LHCb-only version: pdf, png


Number of hadrons versus time.
LHCb-only version: pdf, png


Masses and discovery date for states observed at the LHC. Hollow markers indicate superseded states.


Masses and discovery date for states observed at LHCb. Hollow markers indicate superseded states.


Masses and discovery date for conventional mesons observed at the LHC. Hollow markers indicate superseded states.


Masses and discovery date for conventional baryons observed at the LHC. Hollow markers indicate superseded states.


Masses and discovery date for exotic states observed at the LHC. Hollow markers indicate superseded states.

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 $B_c^*(2S)^+$. The mass of the $B_c(2S)^{*+}$ is determined to be $m(B_c^{*+}(2S))-m(B_c^{*+}) = 567.0\pm1.0$ MeV.
  2. Charged and neutral states seen. The masses reported here are those of the neutral state (using the "empirical fit"). The heavier state could be the $B_J(5970)$ seen by CDF.
  3. Previously known narrow $D_{s}(2860)^-$ resolved into a wide spin-1 and a narrow spin-3 state. We therefore consider the spin-1 state to be new.
  4. A state dubbed $X(4740)$ was reported by LHCb with properties that are consistent with those of the $X(4700)$ state. It is not listed here.
  5. The mass of the $Z_{cs}(4000)^+$ state is consistent with that of the $Z_{cs}(3985)^-$ reported by BESIII but its width is significantly larger.

Please report mistakes and omissions.

A supporting note (dated 2 March 2021, with a count at 59 resonances) is available at LHCb-FIGURE-2021-001.