Combining experimental data to test models of new physics that explain dark matter

The most statistically consistent and versatile tool to date is designed to gain insights into dark matter from models that extend the standard model of particle physics, rigorously comparing them with the latest experimental data

New York | Heidelberg, 21 December 2017

In chess, a gambit refers to a move in which a player risks one piece to gain an advantage. The quest to explain dark matter, a missing ingredient from the minimal model that can describe the fundamental particles we have observed (referred to as the standard model of particle physics), has left many physicists eager to gain an advantage when comparing theoretical models to as many experiments as possible. In particular, maintaining calculation speed without sacrificing the number of parameters involved is a priority. Now the GAMBIT collaboration, an international group of physicists, has just published a series of papers in EPJ C that offer the most promising approach to date to understanding dark matter.

The collaboration has developed the eponymous GAMBIT software, designed to combine the growing volume of experimental data from multiple sources - a process referred to as a global fit - in a statistically consistent manner. Such data typically comes from astrophysical observations and experiments that collide subatomic particles, such as those involving the Large Hadron Collider (LHC), based at CERN in Geneva, Switzerland.

The software enables new experimental data and physics models to be included with ease and is now freely available to the scientific community. With the capacity to take more scenarios into account than was previously possible, this approach opens the door to explorations of many new theoretical explanations of the presence of dark matter.

In the first three GAMBIT physics studies published so far in EPJ C, the authors produce the most rigorous global fits of four different extensions of the standard model, referred to as supersymmetric, and another model, called the simple scalar singlet extension. The global fits include more experiments than previous studies and have yielded new physical insights. Specifically, they included the latest LHC data, which has made it possible to rule out an entire region of the parameter space in one supersymmetric model.

References: 

The GAMBIT Collaboration: P. Athron, C. Balázs, T. Bringmann, A. Buckley, M. Chrząszcz, J. Conrad, J. M. Cornell, L. A. Dal, J. Edsjö, B. Farmer, P. Jackson, F. Kahlhoefer, A. Krislock, A. Kvellestad, J. McKay, F. Mahmoudi, G. D. Martinez, A. Putze, A. Raklev, C. Rogan, A. Saa-vedra, C. Savage, P. Scott, N. Serra, Ch. Weniger, M. White (2017), Status of the scalar singlet dark matter model, European Physical Journal C, DOI 10.1140/epjc/s10052-017-5113-1

The GAMBIT Collaboration: P. Athron, C. Balázs, T. Bringmann, A. Buckley, M. Chrząszcz, J. Conrad, J. M. Cornell, L. A. Dal, J. Edsjö, B. Farmer, P. Jackson, A.. Krislock, A. Kvellestad, . Mahmoudi, G. D. Martinez, A. Putze, A. Raklev, C. Rogan, R. Ruiz de Austri, A. Saavedra, C. Sa-vage, P. Scott, N. Serra, Ch. Weniger, M. White (2017), Global fits of GUT-scale SUSY models with GAMBIT, European Physical Journal C, DOI 10.1140/epjc/s10052-017-5167-0

The GAMBIT Collaboration: P. Athron, C. Balázs, T. Bringmann, A. Buckley, M. Chrząszcz, J. Conrad, J. M. Cornell, L. A. Dal, J. Edsjö, B. Farmer, P. Jackson, A. Krislock, A. Kvellestad, . Mahmoudi, G. D. Martinez, A. Putze, A. Raklev, C. Rogan, A. Saavedra, C. Savage, P. Scott, N. Serra, Ch. Weniger, M. White (2017), A global fit of the MSSM with GAMBIT, European Physical Journal C, DOI 10.1140/epjc/s10052-017-5196-8