Sparticle spectroscopy and dark matter in a U(1)B−L extension of MSSM
Waqas Ahmed, Shabbar Raza, Qaisar Shafi, Cem Salih Un, Bin Zhu
Abstract
A bstract We consider a class of SUSY models in which the MSSM gauge group is supplemented with a gauged U(1) B−L symmetry and a global U(1) R symmetry. This extension introduces only electrically neutral states, and the new SUSY partners effectively double the number of states in the neutralino sector that now includes a blino (from B − L ) and singlino from a gauge singlet superfield. If the DM density is saturated by a LSP neutralino, the model yields quite a rich phenomenology depending on the DM composition. The LSP relic density constraint provides a lower bound on the stop and gluino masses of about 3 TeV and 4 TeV respectively, which is testable in the near future collider experiments such as HL-LHC. The chargino mass lies between 0.24 TeV and about 2.0 TeV, which can be tested based on the allowed decay channels. We also find $$ {m}_{\tilde{\tau}1}\gtrsim $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>m</mml:mi><mml:mrow><mml:mover><mml:mi>τ</mml:mi><mml:mo>˜</mml:mo></mml:mover><mml:mn>1</mml:mn></mml:mrow></mml:msub><mml:mo>≳</mml:mo></mml:math> 500 GeV, and $$ {m}_{\tilde{e}},{m}_{\tilde{\mu}},{m}_{{\tilde{v}}^{S,P}}\gtrsim $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>m</mml:mi><mml:mover><mml:mi>e</mml:mi><mml:mo>˜</mml:mo></mml:mover></mml:msub><mml:mo>,</mml:mo><mml:msub><mml:mi>m</mml:mi><mml:mover><mml:mi>μ</mml:mi><mml:mo>˜</mml:mo></mml:mover></mml:msub><mml:mo>,</mml:mo><mml:msub><mml:mi>m</mml:mi><mml:msup><mml:mover><mml:mi>v</mml:mi><mml:mo>˜</mml:mo></mml:mover><mml:mrow><mml:mi>S</mml:mi><mml:mo>,</mml:mo><mml:mi>P</mml:mi></mml:mrow></mml:msup></mml:msub><mml:mo>≳</mml:mo></mml:math> 1 TeV. We identify chargino-neutralino coannihilation processes in the mass region 0 . 24 TeV $$ \lesssim {m}_{{\tilde{\upchi}}_1^0}\approx {m}_{{\tilde{\upchi}}_1^{\pm }}\lesssim $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>≲</mml:mo><mml:msub><mml:mi>m</mml:mi><mml:msubsup><mml:mover><mml:mi>χ</mml:mi><mml:mo>˜</mml:mo></mml:mover><mml:mn>1</mml:mn><mml:mn>0</mml:mn></mml:msubsup></mml:msub><mml:mo>≈</mml:mo><mml:msub><mml:mi>m</mml:mi><mml:msubsup><mml:mover><mml:mi>χ</mml:mi><mml:mo>˜</mml:mo></mml:mover><mml:mn>1</mml:mn><mml:mo>±</mml:mo></mml:msubsup></mml:msub><mml:mo>≲</mml:mo></mml:math> 1 . 5 TeV, and also coannihilation processes involving stau, selectron, smuon and sneutrinos for masses around 1 TeV. In addition, A 2 resonance solutions are found around 1 TeV, and H 2 and H 3 resonance solutions are also shown around 0.5 TeV and 1 TeV . Some of the A 2 resonance solutions with tan β ≳ 20 may be tested by the A / H → τ + τ − LHC searches.. While the relic density constraint excludes the bino-like DM, it is still possible to realize higgsino, singlino and blino-like DM for various mass scales. We show that all these solutions will be tested in future direct detection experiments such as LUX-Zeplin and Xenon-nT.