# CHEP04

27 September 2004 to 1 October 2004
Interlaken, Switzerland
Europe/Zurich timezone

## Tracking of long lived hyperons in silicon detector at CDF.

30 Sep 2004, 10:00
1h
Coffee (Interlaken, Switzerland)

### Coffee

#### Interlaken, Switzerland

Board: 17
poster Track 2 - Event processing

### Speaker

Dr E. Gerchtein (CMU)

### Description

Long lived charged hyperon, $\Xi$ and $\Omega$, are capable of travelling significant distances producing hits in the silicon detector, before decaying into $\Lambda^0 \pi$ and $\Lambda^0 K$ pairs, respectively. This gives unique opportunity of reconstructiong hyperon tracks. We have developed a dedicated "outside-in" tracking algorithm that is seeded by 4-momentum and decay vertex of the long lived hyperon reconstructed by its decay products. The tracking of hyperons in the silicon detector results in a dramatic reduction of the combinatorial background and an improvement of the momentum resolution compared with the standard reconstruction using final decay products. Using a super clean sample of $\Xi$ hyperons CDF observed charmed-strange baryon isodublet $\Xi^0_c$ and $\Xi^+_c$ for the first time in $p \bar{p}$ collision. $\Xi$ hyperons were used for the search for exotic $S=-2$ baryons decaying into $\Xi \pi$.

### Presentation Materials

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