Gluino mass limits with sbottom NLSP in coannihilation scenarios

Abstract

In view of the recent interest in the pMSSM with light third generation squarks, we consider a hitherto neglected scenario where the lighter bottom squark ( b 1 ) is the next lightest supersymmetric particle (NLSP) which co-annihilates with the lightest supersymmetric particle (LSP), the dark matter (DM) candidate. Since the co-annihilation cross section receives contributions from both electroweak and strong vertices, it is relatively large. As a result relatively large NLSP-LSP mass difference (25-35 GeV) is consistent with the PLANCK data. This facilitates the LHC signatures of this scenario. We consider several variants of the sbottom NLSP scenario with and without light stops and delineate the parameter space allowed by the PLANCK data. We point out several novel signal (e.g., t 1 → b 1 W ) which are not viable in the stop NLSP scenario of DM production. Finally, we consider gluino ( g) decays in this scenario and using the current ATLAS data in the jets (with or without b-tagging) + E / T channel, obtain new limits in the m b 1 − m g mass plane. We find that for m b 1 upto 500 GeV, m g ≥ 1.1-1.2 TeV in this scenario.

Isothermal compressibility of hadronic matter formed in relativistic nuclear collisions

“…The HRG model has been found to provide a good description of the mean hadron yields using a few thermodynamic parameters at freeze-out (for a recent compilation of the freeze-out parameters, see Ref. [58]). The goal in the HRG model calculation is to obtain k T directly from eqn.…”

“…The calculation of k T requires temperature and volume, which are obtained from different sets of measurements. The chemical freezeout temperature (T ch ) and the corresponding volume of the system have been obtained by fitting the measured identified particle yields using thermal model calculations [57,58,59,60,61,62]. For the calculation of k T , both T ch and V have been obtained from Ref.…”

“…For the calculation of k T , both T ch and V have been obtained from Ref. [58]. A compilation of k T as a function of √ s NN for central…”

Kinetic freeze-out conditions in nuclear collisions with 2A–158A GeV beam energy within a non-boost-invariant blast-wave model

“…Hadronic p T spectra, in this investigated energy domain, has also been analyzed within the boost-invariant blast wave model. Relatively higher freeze-out temperatures (T kin > 100 MeV) has been observed even at AGS energies with a slightly weaker transverse flow [34]. However one should take note of the fact, that in the corresponding analysis particles are chosen above a non zero p T value (eg: 0.5 GeV/c for pions) to exclude the effect of resonance decay.…”

Multilepton signals of heavier electroweakinos at the LHC

“…More recent works can be found in [28][29][30][31] 2 For more recent ones see,e.g., [40,41] assumption that only a limited number of relatively light EWeakinos contribute to the 3l signal while the heavier ones are decoupled…”