Exotic hadrons at Anton Poluektov University of Warwick, UK Budker Institute of Nuclear Physics, Novosibirsk, Russia 6 December 16 On behalf of collaboration Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 1/34
Outline experiment Measurements of X (387) Z(443) in B + ψ(s)k + π Pentaquark states in Λ b J/ψ pk Exotic states in Λ b J/ψ pπ Exotic states in B + J/ψ φk Search for X (5568) in Bs π spectrum All results presented here are based on full 3 fb 1 Run 1 data sample (11+1). Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 /34
One-arm spectrometer optimised for studies of beauty and charm decays at LHC Angular acceptance < η < 5 η 8 acceptance 6 GPD acceptance 4 - -4-6 MC s = 14 TeV -8-8 -6-4 - 4 6 8 η 1 Covers forward region (maximum of c and b production) Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 3/34
One-arm spectrometer optimised for studies of beauty and charm decays at LHC Vertexing B s oscillations with B s D sπ [New J. Phys. 15 (13) 531] Covers forward region (maximum of c and b production) Good vertexing: measure B and Bs oscillations, reject prompt background Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 3/34
One-arm spectrometer optimised for studies of beauty and charm decays at LHC PID K/π ID efficiency and misid rate [EPJ C73 (13) 431] Covers forward region (maximum of c and b production) Good vertexing: measure B and Bs oscillations, reject prompt background Particle identification: flavour tagging, misid background Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 3/34
One-arm spectrometer optimised for studies of beauty and charm decays at LHC Tracking µ + µ mass spectrum [PRL 111 (13) 1185] Covers forward region (maximum of c and b production) Good vertexing: measure B and Bs oscillations, reject prompt background Particle identification: flavour tagging, misid background High-resolution tracking Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 3/34
One-arm spectrometer optimised for studies of beauty and charm decays at LHC Calorimetry B s χ c1 φ, χ c1 J/ψγ [Nucl. Phys. B874 (13) 663] Covers forward region (maximum of c and b production) Good vertexing: measure B and Bs oscillations, reject prompt background Particle identification: flavour tagging, misid background High-resolution tracking Calorimetry: reconstruct neutrals (π, γ) in the final state Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 3/34
One-arm spectrometer optimised for studies of beauty and charm decays at LHC Calorimetry B s χ c1 φ, χ c1 J/ψγ [Nucl. Phys. B874 (13) 663] Covers forward region (maximum of c and b production) Good vertexing: measure B and Bs oscillations, reject prompt background Particle identification: flavour tagging, misid background High-resolution tracking Calorimetry: reconstruct neutrals (π, γ) in the final state Efficient trigger, including fully hadronic modes Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 3/34
in Run 1 and Run 3 fb 1 in 11 and 1 (Run 1, s = 7, 8 TeV) fb 1 in 15 and 16 (Run, s = 13 TeV, higher b cross section) Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 4/34
First manifestly exotic candidate: X (387) Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 5/34
X (387) Discovered by Belle in 3 [PRL 91 61 (3)] B + X (397)K +, X (387) J/ψ π + π Events/5 MeV a) Belle Mass close to D D [PRD 91 (15), 111] m(d D ) m(x (387)) = 3 ± 19 kev (sic!) Small width (Γ < 1. MeV) M(π + π - J/ψ) (GeV/c) Hadron machines are also active in studies of X (387) production CDF, [PRL 93:16,4] CMS, 7 TeV [JHEP 4 (13) 154] Candidates / 1 MeV/c 8 DØ 6 4 ψ(s) Candidates / 1 MeV/c X(387) 1 J/ψ.9 3 3.1 3. 3.3 M µ + - (GeV/c ) µ.6.7.8.9 1 M µ - M µ + - (GeV/c ) + µ - π + π - µ Candidates / 5 MeV 1 8 6 4 3 1 1 < p < 5 GeV T y < 1. Candidates / 3.15 MeV CMS s = 7 TeV -1 L = 4.8 fb data total fit background signal 3.75 3.8 3.85 3.9 3.95 4 m(j/ψ π + π - ) [GeV] 3.6 3.7 3.8 3.9 4 - m(j/ψ π + π ) [GeV] 16 14 1 1 3 1 Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 6/34
X (387) results from Observation of prompt X (387) in pp and mass measurement: M(X (387)) = 3871.95 ±.48 ±.1 MeV/c with 35 pb 1 [EPJC 7 (1) 197] Quantum numbers: J PC = 1 ++ (> 8σ over + ) [PRL 11, 1 (13)] Number of candidates / (.5 MeV) 1 1 8 6 4 ψ(s) 1 1 8 6 4 55 6 7 X(387) 6 5 4 3 1 75 8 Number of experiments / bin 7 1 6 1 5 1 4 1 3 1 1 PC -+ Simulated J = PC ++ Simulated J =1 t data 6 8 1 1 14 M(π + π J/ψ) - M(J/ψ) [MeV] - - -1 1 -+ ++ t = - ln[ L( )/L(1 ) ] D-wave decay could invalidate 1 ++, constrained < 4% [PRD 9 (15) 111] Branching ratio to c cγ: [Nucl.Phys. B886 (14) 665-68] R ψγ = B(X (387) ψ(s)γ) B(X (387) J/ψ γ) Rules out purely molecular interpretation (R ψγ 1) =.46 ±.64 ±.9 Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 7/34
Search for X (387) pp Decay B + ppk + First observation of η c(s) pp Mass and width of η c(1s) [arxiv:167.6446] Candidates/(6. MeV) 4 1 3 1 1 η (1S) c J/ ψ χ χ c c1 η (S) c ψ (S) X(387)? 1 1 3 35 4 [MeV] M pp B(B + X (387)K + ) B(X (387) pp) B(B + J/ψ K + ) B(J/ψ pp) <.5 1 @ 95% CL Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 8/34
Charged exotic state: Z(443) Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 9/34
Amplitude analyses Many of exotic measurements use amplitude analysis technique. Perform fits of the amplitude as a function of phase space variables Three-body decays D ABC: at least two kinematic variebles M AB, M BC (Dalitz plot) Add angular variables if initial/final state not scalar Helicity structure Phase space Absolute phase not visible, but phases of components can be accessed though interference with other structures. Model-dependent fits: isobar model (sum of resonant/nonresonant components) Model-independent PWA: for spin J, polynomials up to J order. Helicity as a function of M AB. Dynamics (line shape) Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 1/34
Z(443) in B ψ(s)k + π Decay B ψ(s)k + π Signal yield: 5k events Combinatorial background: 4% 4D amplitude analysis (m (Kπ), m (ψ(s)π), θ ψ, φ ψ ) [PRL 11, (14)] Candidates / 1 MeV 18 16 14 1 1 8 6 4 sideband signal range sideband 55 53 m ψ'k [MeV] + π - [GeV ] - m ψ'π 1 19 18 17 16 15 K (89) Z(443) + K (143).5 1 1.5.5 m [GeV K ] + π - 1 1 1 Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 11/34
Z(443) in B ψ(s)k + π [PRL 11, (14)] ) Candidates / (. GeV ) Candidates / (. GeV 3 1 1 1 1 5.5 1 1.5.5 + [GeV ] data total fit - Z(443) * K (89) * K S-wave excluded * K (143) - Z(443) background * K (168) * K (141) - total fit with no Z(443) m K π data - 1 total fit total fit with no Z(443) - Z(443) * K (89) - Z(443) * K S-wave * K (143) background * K (168) * K (141) excluded 16 18 [GeV m ψ'π ] Model-dependent fit prefers resonance-like state with J P = 1 + Quantum numbers (wrt. favoured J P = 1 + ) J P Belle 9.7 3.4 1 15.8 3.7 + 16.1 5.1 14.6 4.7 Parameters Pseudo-experiments / 1. 3 5 15 1 5 Simulated experiments P JZ = Simulated experiments P + JZ = 1 Data - 4 (- ln L) Belle Mass, MeV/c 4475 ± 7 +15 5 4485 ± +8 11 Width, MeV 17 ± 13 +7 +6 34 +41 46 35 Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 1/34
Z(443): model-independent confirmation [PRL 11, (14)] Model-independent test of phase rotation. Interference with K states provides reference amplitude for phase motion measurement. Z Im A. -. -.4 Magnitude Breit-Wigner fit Data Phase Split M(ψ π ) (477 465 MeV/c ) into 6 bins. Fit magnitude and phase independently for each bin. Clear phase rotation in counter clockwise direction: characteristic of a resonant behaviour. -.6 -.6 -.4 -.. Z Re A Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 13/34
Z(443): model-independent confirmation [PRD 9 (15) 119] Model-independent confirmation of exotic contribution. Check that K π + amplitude only fails to describe the decay. K π + should contribute to reasonably low moments, while exotic ψ π contributes to all moments. J max = l max = 4 (K, K etc.) J max = 3 l max = 6 (+K 3 (178) etc.) J max = 15 l max = 3... ) Yield / (5 MeV/c 14 1 1 8 ) Yield / (5 MeV/c 14 1 1 8 ) Yield / (5 MeV/c 14 1 1 8 6 6 6 4 4 4 38 4 4 44 46 48 m ψ(s)π [MeV/c ] 38 4 4 44 46 48 m ψ(s)π [MeV/c ] 38 4 4 44 46 48 m ψ(s)π [MeV/c ] Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 14/34
Z(443): model-independent confirmation Test statistic: NLL = i W i ɛ i log F l(m i ψπ) F 3(m i ψπ ) [PRD 9 (15) 119] Run toys with K + π -only model to determine distribution, compare with NLL in data. Number of pseudoexperiments 1 1 13.3 σ Data Number of pseudoexperiments 1 1 Data 8. σ Number of pseudoexperiments 1 1 15. σ Data 1-1 1-1 1-1 1 - NLL -5 5 1 15 - NLL 1 3 - NLL l max = 4 l max = 6 l max = 4... 6 depending on m(k + π ) Resonances with spin up to 3 cannot reproduce the features seen in data. Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 15/34
Pentaquarks: P c (438) and P c (445) Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 16/34
Pentaquark states in Λ b J/ψ pk Λ b J/ψ pk decay [PRL 115 (15) 71] Conventional contributions only in pk spectrum (Λ states). Events / ( 4 MeV) 7 6 5 4 3 1 55 56 57 m [MeV] J/ψ K p Event yield: 67 ± 166 events Low background (5.4%) ] [GeV ψp J/ m 6 4 18 16 3 4 5 6 mkp [GeV Dalitz distribution shows an unexpected narrow feature in J/ψ p mass. Not an experimental effect (veto B J/ψ Kh, check part-rec Ξ b decays, clones and ghosts...) ] Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 17/34
Pentaquark states in Λ b J/ψ pk Λ b J/ψ pk decay [PRL 115 (15) 71] Conventional contributions only in pk spectrum (Λ states). Events / ( 4 MeV) 7 6 5 4 3 1 55 56 57 m [MeV] J/ψ K p Event yield: 67 ± 166 events Low background (5.4%) ] [GeV ψp J/ m 6 4 18 Λ resonances J/ψ p resonance 16 3 4 5 6 mkp [GeV Dalitz distribution shows an unexpected narrow feature in J/ψ p mass. Not an experimental effect (veto B J/ψ Kh, check part-rec Ξ b decays, clones and ghosts...) ] Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 17/34
Pentaquark states in Λ b J/ψ pk PRL 115, 71 (15), Full amplitude analysis of the Λ b J/ψ pk decay to understand its dynamics. Fit in 6D phase space: (M Kp, θ Λ b, θ µ, φ µ, θ K, φ K ) Events/(15 MeV) 18 16 14 1 1 8 6 4 (a) data total fit background Λ(145) Λ(15) Λ(16) Λ(167) Λ(169) Λ(18) Λ(181) Λ(18) Λ(183) Λ(189) Λ(1) Λ(11) Λ(35) Λ(385) Events/(15 MeV) 8 7 6 5 4 3 1 (b) 1.4 1.6 1.8..4.6 m K p [GeV] 4 4. 4.4 4.6 4.8 5 m J/ψp [GeV] Admixture of all known Λ states does not reproduce the peak observed at m J/ψ p = 445 MeV. Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 18/34
Pentaquark states in Λ b J/ψ pk PRL 115, 71 (15), Full amplitude analysis of the Λ b J/ψ pk decay to understand its dynamics. Fit in 6D phase space: (M Kp, θ Λ b, θ µ, φ µ, θ K, φ K ) Events/(15 MeV) 18 16 14 1 1 8 6 4 (a) data total fit background P c Λ(145) Λ(15) Λ(16) Λ(167) Λ(169) Λ(18) Λ(181) Λ(18) Λ(183) Λ(189) Λ(1) Λ(11) Λ(35) Λ(385) Events/(15 MeV) 8 7 6 5 4 3 1 (b) 1.4 1.6 1.8..4.6 m K p [GeV] 4 4. 4.4 4.6 4.8 5 m J/ψp [GeV] Inclusion of the exotic J/ψ p state improves the fit, best J P = 5/ ± Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 18/34
Pentaquark states in Λ b J/ψ pk PRL 115, 71 (15), Full amplitude analysis of the Λ b J/ψ pk decay to understand its dynamics. Fit in 6D phase space: (M Kp, θ Λ b, θ µ, φ µ, θ K, φ K ) Events/(15 MeV) 18 16 14 1 1 8 6 4 (a) data total fit background P c(445) P c(438) Λ(145) Λ(15) Λ(16) Λ(167) Λ(169) Λ(18) Λ(181) Λ(18) Λ(183) Λ(189) Λ(1) Λ(11) Events/(15 MeV) 8 7 6 5 4 3 1 (b) 1.4 1.6 1.8..4.6 m K p [GeV] 4 4. 4.4 4.6 4.8 5 m J/ψp [GeV] Two J/ψ p states give the best fit, J = 3/ and 5/ with opposite parities Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 18/34
Pentaquark states in Λ b J/ψ pk PRL 115, 71 (15), Events/(15 MeV) 4 (a) (b) Parameters of the pentaquark states Events/(15 MeV) 4 (c) (d) P c(438): M = 438 ± 8 ± 9 MeV, Γ = 5 ± 18 ± 86 MeV P c(445): M = 4449.8 ± 1.7 ±.5 MeV Γ = 39 ± 5 ± 19 MeV 4 4.5 5 4 4.5 5 [GeV] [GeV] m J/ ψp m J/ ψp Significance (stat+syst) is overwhelming: 9σ and 1σ Apparent need for nd, wide, J/ψ p state Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 19/34
Pentaquark states in Λ b J/ψ pk PRL 115, 71 (15), Argand plots: model-independent confirmation of the resonant character of the exotic states. Interference with Λ states allows to extract the phase in bins of m J/ψ p..15 Im A Pc.1.5 (a) Data (b) Data -.5 -.1 -.15 P c (445) P c (438) -. -.5 -.3 Breit-Wigner fit Breit-Wigner fit -.35 -.35 -.3 -.5 -. -.15 -.1 -.5.5.1.15 -.1 -.5.5.1.15..5.3.35 Re A Pc Re A Pc Clear phase rotation for P c(445), direction consistent with Breit-Wigner amplitude Not conclusive for P c(438), need more statistics. Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 /34
3 1 Model-independent approach: Λ b J/ψ pk Checking that Λ resonances only cannot describe the data. Use Legendre moments in cos θ hel as a function of m pk. Allow l max depending on m pk [PRL 117 (16) 8] 3 1 3 1 3 1 1 l = 1 l = l = 3 1 l = 1 l = 1 l = 3 5 5 5 5 > U < P l 1 5 1 5 1 3 1 l = 4 1 l = 7 5 1 3 1 Λ*'s l = 5 + P c(438), + P c(445) simulation 1 l = 8 5 1 3 1 l = 6 l = 9 U < P l > / (44 MeV) -5-5 -5.5 1.5.51.5 1.5.5 1 l = 41 l = 51 l = 6 5 5 5-5 -5-5.5 1.5.51.5 1.5.5 1 l = 71 l = 81 l = 9 5 5 5 Number of pseudoexperiments 18 16 14 1 1 8 6 F t( (-lnl) H ) Λ* Λ*,P c (438) Γ=5 MeV Λ*,P c (438) Γ=1 MeV 1 1 1 F t ( (-lnl) H Bif. Gaussian fit data Λ*, - 4 6 8 11141618 P c(438) Γ=5 MeV, Λ*, P c(445) Γ=39 MeV P c(438) Γ=51 MeV ) 1 5 3 1 1.5.51.5.5 1 l = 1 1 l = 11 l = 1 5 3 1 1.5.51.5.51.5.5 m Kp [GeV] 5 3 1 Moments from model -5-5 -5.5 1.5.51.5 1.5.5 1 1 l = 1 1 l = 11 1 l = 5 5 5-5 -5-5.5 1.5.51.5 1.5.5 m Kp [GeV] Moments from data 4 simulation 5 1 15 5 3 35 4 (-lnl) 1σ significance Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 1/34
Exotic contributions in Λ b J/ψ pπ [PRL 117 (16) 83] Candidates / ( 5 MeV ) 5 4 3 1 Data Fit Signal Λ b J/ψ pk Cmb. bkg. 5.5 5.6 5.7 m J/ψ pπ [GeV] Signal yield: 1885 ± 5 events Background: % N states in pπ Possible exotic contributions: P c in J/ψ p Z c in J/ψ π [Belle, PRD 9, 119 (14)] M = 4196 + 31 + 17 9 13 MeV/c Γ = 37 ± 7 + 7 13 MeV - ] [GeV J/ψ p m ] [GeV J/ψ π m 3 8 6 4 18 16 18 16 14 1 1 N P c(445) (a) 4 6 [GeV N Z c(4) m p π (b) 4 6 [GeV Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 /34 m p π ] ]
Exotic contributions in Λ b J/ψ pπ Yields/ (5 MeV) 1 1 N(144) N(15) N(1535) N(165) N(1675) N(17) NR Data RM N*+Z c+p c EM N* P c(445) P c(438) Z c(4) N pπ contributions: Basline: isobar pπ with 7-14 states. [PRL 117 (16) 83] Tried BW and Flatté for N(1535) (opening of nη threshold) Yields/ (5 MeV) 1 1 1.5.5 m pπ [GeV] 4 (b) 35 3 5 15 1 5 4.5 5 m J/ψ p [GeV] Cross-check: K-matrix for 1/ using Bonn-Gatchina parametrisation Exotic contributions: Considered P c(438), P c(445) (in J/ψ p) and Z c(4) (in J/ψ π ). Total significance of exotic contributions: 3.1σ. Individual contributions are not significant Fit fractions: F(P c(438)) = (5.1 ± 1.5 +.6 1.6 )% F(P c(445)) = (1.6 +.8 +.6.6.5 )% F(Z c(4)) = (7.7 ±.8 +3.4 4. )% Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 3/34
X (414) and J/ψ φ family Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 4/34
Exotic states in B + J/ψ φk + Peaks in J/ψ φ around 414 and 474 MeV/c are found by CDF and confirmed by D and CMS [CDF, PRL 1, 4 (9)] Candidates per 1 MeV/c 1 8 6 4 1 1.1 1. 1.3 1.4 1.5 - + - - m(µ + µ K K )-m(µ + µ ) [GeV/c ] [D, PRD 89, 14 (14)] 1 DØ Run II, 1.4 fb (c) 6 ) / 3 MeV + N(B 4 Data Full Fit X(414) X(433) PHSP 4. 4.3 + 4.4 4.5 M(J/ψK K ) (GeV) [CMS, PLB 734 (14) 61] ) / MeV + N(B 3 5 15 1 5 CMS, s -1 = 7 TeV, L=5. fb Data Global fit Three-body PS (global fit) ±1σ uncertainty band + Event-mixing (J/ψ, φ, K ) + Event-mixing (J/ψ, φ K ) 1D fit 1.1 1. 1.3 1.4 1.5 m [GeV] Belle [PRL 14:114 (1)]: no X (414), but X (435) in γγ J/ψ φ no evidence from: BaBar [PRD 91, 13 (15)], (.37 fb 1 ) [PRD 85, 9113(R) (1)] Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 5/34
Exotic states in B + J/ψ φk + ] [arxiv:166.7895] Candidates/(1 MeV) 4 35 3 5 [GeV ψ φ m J/ 3 1 16 14 1 1 15 1 5 19 8 6 55 53 535 m J/ [MeV] ψ φk Signal yield: 489 ± 151 events Background: % 18 17.5 3 3.5 4 4.5 5 m φ K [GeV ] 4 Full 6D amplitude analysis Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 6/34
Exotic states in B + J/ψ φk + ] [arxiv:166.7895] Candidates/(1 MeV) 4 35 3 5 15 1 5 55 53 535 m J/ [MeV] ψ φk Signal yield: 489 ± 151 events Background: % [GeV ψ φ m J/ 3 1 19 18 17 K?????? X (474)? X (414)?.5 3 3.5 4 4.5 5 m φ K [GeV ] 16 14 1 1 8 6 4 Full 6D amplitude analysis Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 6/34
Exotic states in B + J/ψ φk + [arxiv:166.7895] Candidates/(1 MeV) 1 1 8 data * total fit (K s) Candidates/(1 MeV) 1 1 8 6 6 4 background 41 4 43 44 45 46 47 48 m J/ [MeV] ψ φ K states only 4 41 4 43 44 45 46 47 48 m J/ ψ φ [MeV] K plus 4(!) exotic states in J/ψ φ Contribution J PC Significance M [ MeV ] Γ [ MeV ] FF % X (414) 1 ++ 8.4σ 4146.5±4.5 +4.6.8 83±1 +1 14 13±3. +4.8. X (474) 1 ++ 6.σ 473.3±8.3 +17. 3.6 56±11 + 8 11 7.1±.5 +3.5.4 X (45) ++ 6.1σ 456±11 +1 15 9±1 +1 6.6±.4 +3.5.3 X (47) ++ 5.6σ 474±1 +14 4 1±31 +4 33 1± 5 + 9 5 Masses for X (414) and X (474) are consistent with previous measurements, but widths significantly larger. Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 7/34
Exotic states in B + J/ψ φk + - [arxiv:166.7895] Im I(Z ) 1.8.6.4...4 cusp Breit-Wigner.4...4.6.8 1 - Re I(Z ) Candidates/(1 MeV) 1 D s + D s 1 cusp 8 6 4 41 4 43 44 45 46 47 48 m J/ ψ φ [MeV] J P = 1 + assignment rules out interpretation of X (414) as a Ds + Ds molecule. X (414) could be a D s + Ds state, below threshold not a Breit-Wigner line shape. Cusp model by [E.S.Swanson, Phys. Rev. D91 349, 15] Preferred by 3σ over Breit-Wigner fit. Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 8/34
bsud candidate: X (5568) Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 9/34
S S Search for exotic states in B s π + spectrum B s J/ψ φ, J/ψ µ + µ, φ K + K [DZero, PRL 117, 3 (16)] N events / MeV/c 15 1 5 1 D Run II, 1.4 fb 4.8 5 5. 5.4 5.6 5.8 6 m (J /ψ φ) [GeV/c ] Bs J/ψ φ, J/ψ µ + µ Yield: 55 events M(X (5568)) = 5567.8 ±.9 +.9 1.9 MeV/c Γ(X (5568)) = 1.9 ± 6.4 +5..5 MeV N events / 8 MeV/c Residuals (Data Fit) 1 1 8 6 4 (b) 1 D Run II, 1.4 fb DATA Fit with background shape fixed Background Signal 5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 15 1 5 5 1 15 5 5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 m (B π [GeV/c ] ± ) B s combined with π +, p T(B s ) > 1 GeV, p T(π + ) > 5 MeV Very large fraction of B s from X decays: ρ X = (8.6 ± 1.9 ± 1.4)% N events / 8 MeV/c Residuals (Data Fit) 9 8 7 6 5 4 3 1 (a) 1 D Run II, 1.4 fb DATA Fit with background shape fixed Background Signal 5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 15 1 5 5 1 5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 m (B π [GeV/c ] ± ) After cone cut, R = η + φ <.3 Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 3/34
Search for exotic states in B s π + spectrum [PRL 117, 153 (16)] has Bs sample times larger: pp environment of course Bs Ds π + and Bs J/ψ φ p T(Bs) > 5 MeV/c and p T(Bs) > 1 MeV/c (to be consistent with DZero) Candidates / (3 MeV) 6 5 4 3 1 Candidates / (3 MeV) 1 1 8 6 4 53 535 54 545 55 555 56 m(d - π + s ) (MeV) B s D s π + Signal yield: 65 1 3 events Background: 1% 5 55 53 535 54 545 55 m(j/ ψ φ) (MeV) B s J/ψ φ Signal yield: 45 1 3 events Background: % Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 31/34
Search for exotic states in B s π + spectrum [PRL 117, 153 (16)] B s D s π + and B s J/ψ φ modes, combined. No cone cut applied. Candidates / (5 MeV) Pull 5 15 1 5 4 4 p (B s) > 1 GeV T Claimed X(5568) state Combinatorial 555 56 565 57 575 58 585 59 595 6 m(bsπ ± ) (MeV) ρ X.7.6.5.4.3..1 9% CL UL ; Γ = 1 MeV 9% CL UL ; Γ = MeV 9% CL UL ; Γ = 3 MeV p (B T s) > 1 GeV 9% CL UL ; Γ = 4 MeV 9% CL UL ; Γ = 5 MeV 555 56 565 57 575 58 585 59 595 6 m(x) (MeV) ρ X Upper limit, 9(95) % CL p T(Bs ) > 5 GeV/c <.11(.1) p T(Bs ) > 1 GeV/c <.1(.4) p T(Bs ) > 15 GeV/c <.18(.) Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 3/34
Search for exotic states in B s π + spectrum [PRL 117, 153 (16)] B s D s π + and B s J/ψ φ modes, combined. No cone cut applied. Candidates / (5 MeV) 3 Claimed X(5568) state p (B s) > 1 GeV T Combinatorial 5 15 1 5 555 56 565 57 575 58 585 59 595 6 555 56 565 57 575 58 585 59 595 6 m(x) (MeV) m(b s π ± ) (MeV) ρ X.7.6.5.4.3..1 9% CL UL ; Γ = 1 MeV 9% CL UL ; Γ = MeV 9% CL UL ; Γ = 3 MeV p (B T s) > 1 GeV 9% CL UL ; Γ = 4 MeV 9% CL UL ; Γ = 5 MeV ρ X Upper limit, 9(95) % CL p T(Bs ) > 5 GeV/c <.11(.1) p T(Bs ) > 1 GeV/c <.1(.4) p T(Bs ) > 15 GeV/c <.18(.) DZero: ρ X = (8.6 ± 1.9 ± 1.4)% in pp collisions Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 3/34
Search for exotic states in B s π + spectrum Candidates / 8 MeV Two preliminary results shown at ICHEP CMS Preliminary 14 (a) 1 1 8 6 4 5.5 5.6 5.7 5.8 5.9 M(B π ± )+M(B ) [GeV] s -1 19.7 fb CMS confirms no evidence [CMS-PAS-BPH-16-] s PDG (8 TeV) Events/8 MeV/c 5 15 1 5 m(x) -1 D Preliminary 1.4 fb Data MC Background Simulation Expected Signal 56 57 58 59 M(B π ) [MeV/c ] DZero with semileptonic B s D s µ + ν µ [DZero Note 6488] s Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 33/34
Summary Exotic spectroscopy is an essential part of physics programme Many important results with 3 fb 1 : X (387) measurements Confirmation and quantum numbers of Z(443) Discovery of hidden-charm pentaquarks Exotic states in J/ψ φ New results still to come with Run 1 sample, and many more expected with added sample of Run : Updates of present analyses with higher stats, precision measurements Pentaquark searches with open-charm states Prompt production of exotic states Final states with neutrals (χ c, Λ, K S, ω) New initial states (B s, B + c, b-baryons) More amplitude analyses Data taking plans: Run (15-18): 8 fb 1 Phase-1 upgrade Run 3 (1-4): 3 fb 1 Phase-1b upgrade (?), HL-LHC Run 4 (7-3): 46 fb 1 Anton Poluektov Exotic hadrons at HINT16, J-PARC, Japan, 5-9 December 16 34/34