M. Dima

Dept. of Theoretical Physics

CERN, 17.09.2007

Sliding VTX Method in Physics and Detector

Institute for Nuclear Physics & Engineering

Bucharest - Romania

IP

Bs0

K+ K -

-

Ds-

+

sliding VTX

Bs0 Ds

- +

Institute for Nuclear Physics & Engineering

Bucharest - Romania

+ solution

- solution?! …

BVTX

DVTX

Furthering SLD’s

Missing p Series … 0

BRvisexclusive

= 6.90 %

BRvisinclusive

= 6.70 %

TOTAL: x 2 faster to ms

Institute for Nuclear Physics & Engineering

Bucharest - Romania

2 independent cond.’s:

• pB point-back

• MB window

simultaneously obsv.

real solution !

Institute for Nuclear Physics & Engineering

Bucharest - Romania

Rare ambiguities:

… what to do ?

Institute for Nuclear Physics & Engineering

Bucharest - Romania

No-detector errors:

sliding step = 50 m

TO DO:

Study detector induced resolution

IP

D -

Institute for Nuclear Physics & Engineering

Bucharest - RomaniaLepton Source

PID Calibration

Hard-to-Get PID Cal. Source:

• very clean (precise VTX’s)

• large momentum range

• both e /

• .... and K /

Bd 0

BVTX

DVTX

+

K -

l -

l +

Bd 0 D

- +

- +

+

-

2 x 0.17 M l / week of running

0.33 M K / week of running

1.34 M / week of running !m

is-ID

sys

t.’s

PID e

ff.’stag-

ID e

ff.’s

IP

D 0

Institute for Nuclear Physics & Engineering

Bucharest - RomaniaLepton Source

PID Calibration

… similar (-42% yield)

TOTAL:

Bd 0

BVTX

DVTX

+

K -

l +

l

Bd 0 D*

- +

- +

+ -

2 x 0.27 M l / week of running

0.52 M K / week of running

2.12 M / week of running !m

is-ID

sys

t.’s

PID e

ff.’stag-

ID e

ff.’s

-

IP

-

J/ , - +

Institute for Nuclear Physics & Engineering

Bucharest - RomaniaProton Source

PID Calibration

pProton source:

• simple + very clean

• J/ reasonable yield (CDF)

VTX

VTX

+

p

IP

-

K -

- K -

Institute for Nuclear Physics & Engineering

Bucharest - Romania

VTX

p-K- Source

PID Calibration p

Excellent PID Cal. Source:

• source = p, K,

• simple + very clean

• CDF = 10vis / pb-1 (trig. ?)

• large momentum range

2 x 1.20 kp / wk running

… s phys. ?

-

VTXsliding VTX

VELO trk

c = 24.6 mm

IP

-

-

0

-

- 0 -

Institute for Nuclear Physics & Engineering

Bucharest - Romania

0

VTX

VTX

Proton Source

PID Calibration

VTX0

p

2 independent cond.’s:

• 2 way computation p 0

, mass-windows

… graduate project

learn to do physics

sliding VTX

VELO trk

c = 24.6 mm