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Studies for a silicon detector in a e/A collider Benedetto Di RuzzaPowerPoint Presentation

Studies for a silicon detector in a e/A collider Benedetto Di Ruzza

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### Studies for a silicon detector in a e/A colliderBenedetto Di Ruzza

BNL EIC Task Force meeting

August 28th 2014

- Momentum resolution studies for a silicon detector in a eRHIC collider using the EICRoot framework.
- Some consideration on bremsstrahlung for electron in silicon.
- The ITS Alice upgrade.

Momentum resolution studies performed using a simple detector model in the EICRoot framework

Detector model: barrel

Electron energies: 5, 15 and 20 GeV

Eta : 0, 0.5, 1,1.5, 2, 2.5, 3

Forward and Rear:

In each configuration performed the simulation of 2000 events.

Crystal ball function “like” used in the fit fit:

Crystal ball function like function used in the fit:

P0= alpha, P1= n; P2= mean, P3= sigma, P4=N

Ratio tail/all events

- Repeat the fit with a crystal ball function
- change particles and detector design

electron bremsstrahlung in Si

electron bremsstrahlung in Si

Some calculation with X0 =9.36 cm

Fraction of energy loss by electrons for bremsstrahlung

For 300 µm silicon: exp -(0.03/9.36)=0.0032

Other calculation: using the Bremsstrahlung energy spectrum

electron bremsstrahlung in Si

Some calculation with X0 =9.36 cm

(thanks to Sasha Bazilevsky for useful discussions)

Fraction of energy loss by electrons for bremsstrahlung:

Numerical calculation using bremsstrahlung gamma spectrum from PDG:

Energy (Gev)

Number of gamma

Ratio of Integral over all spectrum/incoming energy = 0.0032

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