Clusters of Cold Dense Nuclear Matter and Their Registration with the MPD Vertex Detector

Dense Cold Quark–Gluon Matter Clusters and Their Study at the NICA Collider

“…From Table 2 it can be seen that, at an initial energy of 4 GeV, the predictions for particle multiplicities obtained within the framework of the described theoretical model are consistent to within approximately an order of magnitude with the results obtained using both Gaussian and exponential fits of the experimental data. At an initial energy of 8 GeV, the results of the present theoretical calculations support the results obtained using the more natural exponential fits for the transverse momentum dependence proposed in [31,32], while the use of Gaussian type fits [9,10] predicts extremely low particle multiplicities into this new cumulative region at this energy.…”

“…This Gaussian approximation (7), used in [9,10], does not seem quite realistic to us, especially in light of the extrapolation of this dependence to the region of sufficiently large transverse momenta (region C in Figures 1 and 2). Therefore, in the works [31,32] we proposed an alternative parameterization of the dependence of the data [9,10] on the transverse momentum by a simple exponent, which usually provides a more adequate description of the data for large transverse momenta:…”

“…Unfortunately, as shown in [31,32], although both approximations provide an adequate description of the experimental data [9,10] in the nucleus fragmentation region (region F in Figures 1 and 2), they provide very different results, especially at higher initial energy ( √ s NN = 8 GeV), when we use them to calculate particle yields in the new cumulative region of central rapidities and large transverse momenta (region C in Figures 1 and 2) available for study at the NICA MPD. In these figures, we depict the pseudorapidity acceptance (−1 < η < 1) of the MPD detector in the NN collision center of the mass frame.…”

“…For comparison, we carried out similar calculations using the Gaussian dependence on the transverse momentum (7), as used in the original experimental works [9,10], and with the exponential dependence (7) proposed in [31,32]. The value x = 1.6 was chosen as the beginning of the cumulative region because the fits used in these works are valid for both pions and protons when starting from this value.…”

Dense Cold Quark-Gluon Matter Clusters and their Studies at the NICA Collider

“…Table 2. Pion and proton integrated multiplicities in the new cumulative region at x ∈ (1.6, 3.0) and y ∈ (−1, −0.5) (region C in Figures 1 and 2) for pAu collisions calculated with the transverse momentum dependences (11) and ( 14) obtained in the theoretical approach [16][17][18][19][20][21] (Theor) for initial energies of 4 and 8 GeV, and the same with the Gaussian dependence (7) used in the experimental works [9,10] (Gauss) and the exponential dependence (7) proposed in [31,32] (Exponent).…”