Pr eli mi na ry

J/^– and (2S) ^– distributions

background (from K) + BW (free mass & width) No signal in J/ ^- (like in Belle), ~2 in (2S)  ^- :

< 2.6x10^-5@ 95% CL, (4.1 ± 1.0 ±1.4) x 10^-5

(2S)^– mass distribution is statistically consistent with Belle (²/ndf=54.7/58)

- K* veto: M=4437±5, =23±25 MeV, 1.7

- K^*(892) + K^*₂(1430): M=4483±3, =15±11 MeV, 2.5

B(B⁰Z^–K⁺(2S)^^) at M=4430 & =45 MeV:

shifted ICHEP 08, 413 fb^-1



^K^^-



^^K

K contributions,

2) _K is parameterized

arXiv:0905.2869

procurou Z

(4430) em 4 modos de decaimento:

sem evidência conclusiva

para a existência do Z⁺(4430) visto pela Belle

terça-feira, 21 de julho de 15

Z ⁺ (4430)

Belle @ KEK: (arXiv:0708.1790)

distinct peak observed in the decay mode:

B ¯

⁰

→ K

⁻

(ψ

π

⁺

)

Q = + ⇒ minimum quark content: c cu ¯ d ¯

M = (4433 ± 14) MeV Γ = (44 ± 17) MeV

J

=?

^? _3.8 _4.05 _4.3 _4.55 _4.8

M(!⁺"^#) (GeV) 0

10 20 30

Events/0.01 GeV

Z

⁺

(4430) → ψ

π

⁺

⇒ I

= 1

⁺

M ( ¯ D

₁⁰

(2420)D

^∗⁺

(2010)) = 4430 MeV

– p.26/34

B Z(4430)

⁺

K  S

⁺

K: charged state  not cc!

M2 ((2S) + ), GeV2

M²(K^-/K⁰_S ⁺), GeV² K*(890) K*(1430)

veto veto

S-wave BW + ph. space-like bgr:

121±30 ev., 6.5 significance M = 443342 MeV





 = 45⁺¹⁸_-13⁺³⁰_-13 MeV  narrow

 cannot be explained by interf. in K channel K mass from ±30 MeV Z(4433)⁺ window

M((2S)⁺), GeV non-B bgr. from

E sidebands S-wave D^*D₁(2420)

thresh. effect

PRD76,114002

[cu][cd] tetraquark

hep-ph/0708.3997

D^*D₁(2420) molecule

0708.4222,0710.1029, 0711.0494

PRL100, 142001, 605 fb^-1

⁺^- J/ ( ⁺^-, e⁺e^-)

PRL100(08)142001

estado carregado ➡ não é um ! c¯ c

BaBar search for Z(4430)

⁺

in B

^-0

 J/ 

K

⁰⁺

,  (2S) 

K

⁰⁺

S-wave P-wave D-wave

M²(K⁰^–)

M²(K⁺^–)

M2 ((2S)), (GeV2 ) Detailed study of K^– system before looking at J/^–, (2S)^– :

M(K



) plot 1) S, P, D wave intensity

K^*(892)+K^*(1430) region

K^*(892)+K^*(1430)

veto

M((2S)), GeV

4430

J/^– and (2S) ^– distributions

background (from K) + BW (free mass & width) No signal in J/ ^- (like in Belle), ~2 in (2S)  ^- :

< 2.6x10^-5@ 95% CL, (4.1 ± 1.0 ±1.4) x 10^-5

(2S)^– mass distribution is statistically consistent with Belle (²/ndf=54.7/58)

- K* veto: M=4437±5, =23±25 MeV, 1.7

- K^*(892) + K^*₂(1430): M=4483±3, =15±11 MeV, 2.5

B(B⁰Z^–K⁺(2S)^^) at M=4430 & =45 MeV:

shifted ICHEP 08, 413 fb^-1



^K^^-



^^K

K contributions,

2) _K is parameterized

arXiv:0905.2869

procurou Z

(4430) em 4 modos de decaimento:

B Z(4430)

⁺

K  S

⁺

K: charged state  not cc!

M2 ((2S) + ), GeV2

M²(K^-/K⁰_S ⁺), GeV² K*(890) K*(1430)

veto veto

S-wave BW + ph. space-like bgr:

121±30 ev., 6.5 significance M = 443342 MeV



 = 45⁺¹⁸_-13⁺³⁰_-13 MeV  narrow

 cannot be explained by interf. in K channel K mass from ±30 MeV Z(4433)⁺ window

M((2S)⁺), GeV non-B bgr. from

E sidebands S-wave D^*D₁(2420)

thresh. effect

PRD76,114002

[cu][cd] tetraquark

hep-ph/0708.3997

D^*D₁(2420) molecule

0708.4222,0710.1029, 0711.0494

PRL100, 142001, 605 fb^-1

⁺^- J/ ( ⁺^-, e⁺e^-)

arXiv:1306.4894

/c4

), GeV2

(K,π M2

0.5 1 1.5 2 2.5

4 /c2 Events / 0.046 GeV

10-1

1 10 102

/c4

) < 19 GeV2

’,π (ψ M2

/c4

), GeV2

(K,π M2

0.5 1 1.5 2 2.5

4 /c2 Events / 0.046 GeV

10-1

1 10 102

/c4

) < 20.5 GeV2

’,π (ψ < M2

/c4

19 GeV2

/c4

), GeV2

(K,π M2

0.5 1 1.5 2 2.5

4 /c2 Events / 0.046 GeV

10-1

1 10 102

/c4

) > 20.5 GeV2

’,π (ψ M2

/c4

), GeV2

’,π (ψ M2

15 16 17 18 19 20 21 22 23

4 /c2 Events / 0.17 GeV

0 2 4 6 8 10 12 14

) < 0.796 GeV/c2

M(K,π

/c4

), GeV2

’,π (ψ M2

15 16 17 18 19 20 21 22 23

4 /c2 Events / 0.17 GeV

0 10 20 30 40 50

) < 0.996 GeV/c2

< M(K,π 0.796 GeV/c2

/c4

), GeV2

’,π (ψ M2

15 16 17 18 19 20 21 22 23

4 /c2 Events / 0.17 GeV

0 5 10 15 20 25 30 35

) < 1.332 GeV/c2

< M(K,π 0.996 GeV/c2

/c4

), GeV2

’,π (ψ M2

15 16 17 18 19 20 21 22 23

4 /c2 Events / 0.17 GeV

0 5 10 15 20 25 30

) < 1.532 GeV/c2

< M(K,π 1.332 GeV/c2

/c4

), GeV2

’,π (ψ M2

15 16 17 18 19 20 21 22 23

4 /c2 Events / 0.17 GeV

0 1 2 3 4 5 6

) > 1.532 GeV/c2

M(K,π

FIG. 6: The fit results with (solid line) and without (dashed line) Z⁺ (J^P = 1⁺) in the default model. The points with error bars are data; the hatched histograms are ψ^! sidebands. Slices are defined in Fig. 5.

TABLE III: The fit fractions and significances of all resonances in the default model.

Resonance Z(4430)⁺: J^P = 1⁺ Z(4430)⁺: J^P = 0⁻ Fit fraction Significance Fit fraction Significance K0^∗(800) (5.9 ± 1.6)% 5.5σ (11.7 ± 2.5)% 6.5σ K^∗(892) (59.8 ± 2.7)% 40.1σ (68.0 ± 2.6)% 41.9σ K^∗(1410) (7.9 ± 2.4)% 3.1σ (1.8 ± 1.2)% 0.7σ K0^∗(1430) (3.4 ± 1.2)% 4.5σ (4.2 ± 1.8)% 3.8σ K2^∗(1430) (5.5 ± 0.9)% 5.5σ (7.4 ± 0.9)% 6.3σ K^∗(1680) (7.7 ± 1.6)% 2.9σ (7.3 ± 2.0)% 2.5σ Z(4430)⁺ (6.1⁺²₋₁^._.¹₃)% 6.1σ (2.5⁺¹₋₀^._.¹₈)% 4.4σ

/c4

), GeV2

’,π (ψ M2

15 16 17 18 19 20 21 22 23

4 /c2 Events / 0.17 GeV

0 5 10 15 20 25 30 35 40 45

FIG. 7: Projection of the fit results with the K^∗ veto. The legend is the same as in Fig. 6.

The central value is given for the default model with the Z(4430)⁺ having J^P = 1⁺. The systematic error in- cludes contributions from the same sources as the uncer- tainty in the branching fraction of the ¯B⁰ → ψ^!K⁻π⁺ decay and the amplitude model dependence of the K^∗(892) fit fraction [(^+27.3−4.3 )%]. We also determine the fraction of the K^∗(892) mesons that are longitudinally polarized:

f_L = (41.5^+3.1+3.2−2.3−0.3)%.

The branching fraction product for the Z(4430)⁺ is

B( ¯B⁰ → Z(4430)⁺K⁻) × B(Z(4430)⁺ → ψ^!π⁺) = (3.5^+1.2+0.4−0.8−1.3) × 10⁻⁵ for J^P = 1⁺ or

(1.5^+0.7+0.7−0.5−0.2) × 10⁻⁵ for J^P = 0⁻,

where the systematic error due to the amplitude model dependence is (^+10.3−37.5)% for the 1⁺ hypothesis and (^+44.9−13.4)% for the 0⁻ hypothesis.

confirmou a observação do

Z

⁺

(4430) com 6.1 σ e J

⁺

=1

⁺

sem evidência conclusiva

para a existência do Z⁺(4430) visto pela Belle

terça-feira, 21 de julho de 15

arXiv:1404.1903

confirmou a observação do Z

⁺

(4430) com 13.9 σ e J

⁺

=1

⁺

2] [GeV

2 ₋ 'π

mψ

16 18 20 22

)2 Candidates / ( 0.2 GeV

0 100 200

LHCb

< 1.8 GeV2 2

π−

K+

1.0 < m

Figure 4: Distribution of m²₀_⇡ in the data (black points) for 1.0 < m²_K+⇡ < 1.8 GeV² (K^⇤(892), K₂^⇤(1430) veto region) compared with the fit with two, 0 and 1⁺ (solid-line red histogram) and only one 1⁺ (dashed-line green histogram) Z resonances. Individual Z terms (blue points) are shown for the fit with two Z resonances.

Acknowledgements

We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative sta↵

at the LHCb institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ and FINEP (Brazil); NSFC (China); CNRS/IN2P3 and Region Auvergne (France); BMBF, DFG, HGF and MPG (Germany); SFI (Ireland);

INFN (Italy); FOM and NWO (The Netherlands); SCSR (Poland); MEN/IFA (Romania);

MinES, Rosatom, RFBR and NRC “Kurchatov Institute” (Russia); MinECo, XuntaGal and GENCAT (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC and the Royal Society (United Kingdom); NSF (USA). We also acknowledge the support received from EPLANET, Marie Curie Actions and the ERC under FP7. The Tier1 computing centres are supported by IN2P3 (France), KIT and BMBF (Germany), INFN (Italy), NWO and SURF (The Netherlands), PIC (Spain), GridPP (United Kingdom). We are indebted to the communities behind the multiple open source software packages on which we depend. We are also thankful for the computing resources and the access to software R&D tools provided by Yandex LLC (Russia).

terça-feira, 21 de julho de 15

T e

Maiani et al. (arXiv:0708.3997) : excitação radial do estado de quatro-quarks carregado 1⁺ (parceiro do X(3872))

terça-feira, 21 de julho de 15

T e

Maiani et al. (arXiv:0708.3997) : excitação radial do estado de quatro-quarks carregado 1⁺ (parceiro do X(3872))

Z⁺(4430) ⇥(2S) ⁺

devia ser visto no canal de decaimento J/ψπ

terça-feira, 21 de julho de 15

T e

Maiani et al. (arXiv:0708.3997) : excitação radial do estado de quatro-quarks carregado 1⁺ (parceiro do X(3872))

M _(2S₎ M _(1S₎ ⇥ 590 MeV ⇥ M_Z⁺ M_X

Z⁺(4430) ⇥(2S) ⁺

devia ser visto no canal de decaimento J/ψπ

terça-feira, 21 de julho de 15

T e

Maiani et al. (arXiv:0708.3997) : excitação radial do estado de quatro-quarks carregado 1⁺ (parceiro do X(3872))

M _(2S₎ M _(1S₎ ⇥ 590 MeV ⇥ M_Z⁺ M_X

quem é o parceiro

carregado do X(3872)?

Z⁺(4430) ⇥(2S) ⁺

devia ser visto no canal de decaimento J/ψπ

terça-feira, 21 de julho de 15

Y (4260) ! (J/ ⇡

⁺

)⇡

arXiv:1303.5949 arXiv:1304.0121

III

M = (3890±3.6±4.9) MeV Γ = (46±10±20) MeV

M = (3894.5±6.6±4.5) MeV

Γ = (63±24±26) MeV

No documento Marina Nielsen - MESONPI (páginas 54-61)

Pr eli mi na ry





procurou Z

(4430) em 4 modos de decaimento:

Z + (4430)

Belle @ KEK: (arXiv:0708.1790)

distinct peak observed in the decay mode:

B ¯

→ K

(ψ

π

)

Q = + ⇒ minimum quark content: c cu ¯ d ¯

M = (4433 ± 14) MeV Γ = (44 ± 17) MeV

J

=?

Z

(4430) → ψ

π

⇒ I

= 1

M ( ¯ D

(2420)D

(2010)) = 4430 MeV

B Z(4430)

K  S

K: charged state  not cc!

estado carregado ➡ não é um ! c¯ c

BaBar search for Z(4430)

in B

 J/ 

K

,  (2S) 

K



Pr eli mi na ry





procurou Z

(4430) em 4 modos de decaimento:

B Z(4430)

K  S

K: charged state  not cc!

confirmou a observação do

Z

(4430) com 6.1 σ e J

=1

confirmou a observação do Z

(4430) com 13.9 σ e J

=1

LHCb

Acknowledgements

T e

T e

T e

T e

quem é o parceiro

carregado do X(3872)?

Y (4260) ! (J/ ⇡

)⇡

III

M = (3890±3.6±4.9) MeV Γ = (46±10±20) MeV

M = (3894.5±6.6±4.5) MeV

Γ = (63±24±26) MeV

Z ⁺ (4430)