Recent B physics results from D0

Nuclear Physics B (Proc. Suppl.) 185 (2008) 181–186 www.elsevierphysics.com

ΔΓ s (ps-1)

0.4

D∅ , 2.8 fb-1

(a)

0

0.3

Bs → J/ψ φ ΔMs ≡ 17.77 ps-1

0.2 0.1 -0 SM

-0.1 -0.2-2

0920-5632/$ – see front matter © 2008 Published by Elsevier B.V. doi:10.1016/j.nuclphysbps.2008.10.022

ΔΓ = ΔΓSM × |cos(φs)|

-1.5

-1

-0.5

0

0.5

1

1.5

φs (radian)

182

B. Abbott / Nuclear Physics B (Proc. Suppl.) 185 (2008) 181–186

Data Total Fit Total Signal

-1

DØ , 2.8 fb B0s

3

10

→ J/ψ φ

Mass 5.26 - 5.46 GeV 2

10

CP-even CP-odd Background

10

D0 Run II Preliminary (2.8 fb-1) Candidates / ( 0.03 GeV/c2 )

Candidates per 25.0 μ m

104

70 60 50 40 30 20 10 0 1.7

1

1.8

1.9

2.0

2.1 2.2 2.3 m(φ π) (GeV/c2) 1

-1 10-0.1

0

0.1

0.2

0.3

0.4

0.5

ct (cm)

183

m( φ μ ) vs. m(D

D0 RunII Preliminary (2.8 fb-1)

φ μ)

1

m(φ μ) (GeV/c 2)

s

3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.03.0

3 2

1

Events / ( 40 MeV/c2 )

B. Abbott / Nuclear Physics B (Proc. Suppl.) 185 (2008) 181–186

40

DØ, 1.3 fb-1

35 30 25 20 15 10 5

3.5

4.0

4.5

5.0 5.5 6.0 m(Dsφ μ) (GeV/c2) 2

0 5.6

5.8

6

6.2

6.4

6.6Invariant 6.8 Mass7(GeV/c7.2 2 )

M(μμπ) [GeV/c2]

B. Abbott / Nuclear Physics B (Proc. Suppl.) 185 (2008) 181–186

180 160 140 120 100 80 60 40 20 0 3

D

-1

1.3 fb

Total Signal J/ψ MC Prompt J/ψ + Track

Events/0.005 cm

Events / 0.23 GeV

184

4

D

10

1.3 fb -1

3

10

2

10

10

Total Fit Signal J/ψμ MC J/ψ SB+ μ Prompt J/ψ+Track + B

1

4

5

6

7

8 9 10 M(J/ ψμ) [GeV]

-1

10 -0.1 -0.05

0

0.05

0.1

0.15 0.2 0.25 0.3 VPDL [cm]

185

B. Abbott / Nuclear Physics B (Proc. Suppl.) 185 (2008) 181–186

2.5 2 1.5

D∅ RunII Preliminary: data ± 1 σ (tot)

∫ L dt = 2.4 fb

-1

data ± 1.645 σ (stat) data ± 1.645 σ (tot)

May 2, 2008

Δ lnL

1 0.5

D∅ RunII Preliminary: 10

∫ L dt = 2.4 fb

-1

stat error only

0

total error

-0.5

5

-1 -1.5

sensitivity: 27.3 ps-1 (tot)

0

-2 -2.5 0

5

10

15

20

25

30 -1 Δms (ps )

-5 Δ lnL(min) = -4.08 -10

-1

Δ ms = 18.53 ± 0.93(stat) ± 0.30(syst) ps

12

14

12000 Entries/0.03 [GeV/c2]

Amplitude

March 5, 2008

16

18

20

22

24

26

28 30 -1 Δms (ps )

DATA J/ψK J/ψπ J/ψK*

D0 Run II, 2.8 fb-1

10000

BKG TOTAL FIT

8000 6000 4000 2000 0

5

5.1

5.2

5.3 5.4 5.5 m(J/ψK) [GeV/c2]

5.6

5.7

186

B. Abbott / Nuclear Physics B (Proc. Suppl.) 185 (2008) 181–186

400

a)

data-driven fit

2 χ /ndf=1.11 150

ϒ(1S)

ϒ(2S) ϒ(3S)

200 0

8

-1

200

DØ, 1.3 fb

b)

0.2 8

2

Events/0.05GeV/c

Events/N/bin

-1

MC-driven fit

c)

200

2 χ /ndf=1.14 150

100

200

50 8

10 12 14 + 2 Mass(μ μ ) [GeV/c ]

-1

0.2 DØ, 1.3 fb 0.2 (a)

Events/N/bin

-1

400

0

0 0

0

0 0

Events/N/bin

0.1

0 0

0 2

(i)

-0.6 -0.8

2

8

(d) 0.1

100 o Θ[ ] (g)

5.5 9 pTμ [GeV/c] (j)

0 0

0

2.5

5

7.5

10 12.5 15 17.5 20 pT of ϒ(1S) [GeV/c]

7.5

10 12.5 15 17.5 20 pT of ϒ(2S) [GeV/c]

10 12 14 + 2 Mass(μ μ ) [GeV/c ]

0.2

200 μ o φ []

-0.4

MC-driven fit

0 0 0.2

0.5 1 * |cosΘ |

0 0

1

DØ, 1.3 fb

0.8 200 o φ[ ] (h)

-1

0.6 0.4 0.2 0

0.2 20 μ p [GeV/c]

-0.2

χ /ndf=0.92

0.2

0.2 100 o μμ angle [ ]

d)

0

DØ, 1.3 fb

(c)

(b)

0 0 20 40 2 3 4 0 p [GeV/c] pT [GeV/c] 0.4 0.4 (e) (f)

0.2 0 0

10 12 14 + 2 Mass(μ μ ) [GeV/c ] 10
DØ, 1.3 fb

800

-1

0.4

50

10 12 14 + 2 Mass(μ μ ) [GeV/c ]

DØ, 1.3 fb

0.6

100

0

1 0.8

2

χ /ndf=0.93

2
600

data-driven fit

α

800 600

10
DØ, 1.3 fb

α

Events/0.05GeV/c

2

2
-0.2 100 μ o Θ []

-0.4 -0.6 -0.8

0

2.5

5