Photon Event Mixing

Here photon i from event1 is mixed with photon j=1,2... of event2 if E(j-1)>E(i).
All electrons. C+Fe+Pb+D targets

1D distributions
Fig.1 Invariant mass from uncorrelated events in Z, pT, Q2, Nu bins fitted with POL4






2D distributions
Fig.2a Invariant mass from uncorrelated events in (Z,pT)

Fig.2b Invariant mass from uncorrelated events in (Z,q)

Fig.2c Invariant mass from uncorrelated events in (Z,v)

Fig.2d Invariant mass from uncorrelated events in (pT,q)

Fig.2e Invariant mass from uncorrelated events in (pT,v)

Fig.2e Invariant mass from uncorrelated events in (q,v)

3D distributions
Fig.3a Invariant mass from uncorrelated events in (Z,pT,q)

Fig.3b Invariant mass from uncorrelated events in (Z,pT,v)





Background Fits Comparison

Reason: mixed background fails in high z/pT2 bins due to EC cluster reconstruction

Fig.1a Invariant Mass in Z bins(vertical) for all 6 targets
From left to right 6(targets)x9(zbins) panels background is: 1. unconstrained(limited) POL2; 2. unconstrained(but limited) POL4;
3. [0]*POL4 with parameters from mixing; 4. as 3. with last 2 zbins fitted [0]*1/x; 5. as 3. with last 3 zbins fitted with POL2

Fig.1b Multiplicity ratio for each of the fitting methods correspondingly


Fig.2a Invariant Mass in pT2 bins(vertical) for all 6 targets
1. unconstrained(limited) POL2; 2. unconstrained(but limited) POL4;
3. [0]*POL4 with parameters from mixing; 4. as 3. with last 2 zbins fitted [0]*1/x; 5. as 3. with last 3 zbins fitted with POL2

Fig.2b Multiplicity ratio for each of the fitting methods correspondingly


Fig.3a Invariant Mass in Q2 bins(vertical) for all 6 targets
1. unconstrained(limited) POL2; 2. unconstrained(but limited) POL4;
3. [0]*POL4 with parameters from mixing; 4. as 3. with last 3 zbins fitted with POL2

Fig.3b Multiplicity ratio for each of the fitting methods correspondingly

Fig.4a Invariant Mass in V bins(vertical) for all 6 targets
1. unconstrained(limited) POL2; 2. unconstrained(but limited) POL4;
3. [0]*POL4 with parameters from mixing; 4. as 3. with last 3 zbins fitted with POL2

Fig.4b Multiplicity ratio for each of the fitting methods correspondingly

Fig.2