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other, while geometry has no such communication. The right hand does not need to know what the left hand is doing. However, if physics symmetry makes them do the same thing then they can show a cor- relation. 

The away side peak depends on the fragmenta- tion of the away side bubble. For the triggered case where there is a hard bubble with a strong corre- lation of parton p t inside the bubble (GFTM like), we will have more correlated particles adding to the signal on the near side. On the other hand the away side bubble will be on average a softer bubble which will have a lot less particles passing the p t cuts and thus have a smaller signal. If we consider the case of a random parton p t bubble the particles passing the p t cuts should be very similar on the near and the away side. In Fig. 8 we compare the two cor- relations generated by the correlated and the ran- dom cases. We compare the Δ φ correlation for the two cases (solid is correlated and open is random)for each of the five Δ η bins which cover the entire Δ η range (0.0 to 1.5). The vertical correlation scale is not offset and is correct for the largest Δ η bin, 1.2 < Δ η < 1.5, which is the lowest bin on the figure. As one proceeds upwards to the next Δ η bin the 

<img src='content_image/411886.jpg'>

## B. The away side peak 

correlation is offset by +0.05. This is added to the correlation of each subsequent Δ η bin. The smallest Δ η bin on top of Fig. 8 has a +0.2 offset. A solid straight horizontal line shows the offset for each Δ η bin. Each solid straight horizontal line is at 1.0 in correlation strength. We see that the away side cor- relation in the Δ φ region greater than about 120 ◦ is larger for the random case. 

## C. Predicted transverse momentum dependence of correlation 

Particles which come from bubbles that satisfy the trigger (3.0 < p t < 4.0 GeV/c) are harder and have a different p t distribution compared to the case with- out trigger requirements. In a given triggered event if one could select particles that come from the bub- ble or ridge, one would find that the p t spectrum is harder than the average p t spectrum. In Fig. 9 we show how one can by trigger choose particles that are rich with ridge particles. We consider a typi- cal trigger particle and the associated regions in the available experimental φ and η ranges. The ridge particles we consider are separated from the trigger particle by 0.7 in η . This is done to eliminate par- ticles coming from jet production that could also be associated with the trigger particle. The bulk of the ridge particles lie within 20 ◦ of the φ of the trigger 

