The future of particle physics: what can the past teach us?

The future of particle physics: what can the past teach us?

In the heart of CERN's main auditorium, a space that has witnessed historic announcements like the discovery of the Higgs boson, the 4th International Symposium on the History of Particle Physics took place last November. The symposium, which drew together experts and historians of the field, was not your typical scientific conference. Its unconventional nature was evident from the opening remarks of Chris Llewellyn Smith, a former director-general of CERN in the 1990s. He encouraged participants to delve into topics that were often overlooked in scientific journals, such as mistakes, dead-ends, and challenges in securing funding. According to Llewellyn Smith, discussing these aspects could offer valuable insights into the realities of scientific progress.

The 1980s and 1990s were a transformative period for particle physics, marked by the construction and operation of several significant accelerators and detectors. At CERN, this era saw the UA1 and UA2 experiments at the Super Proton Synchrotron, where the W and Z bosons were discovered, paving the way for the Standard Model of particle physics. Later, the Large Electron-Positron Collider (LEP) came online in 1989, providing crucial data on the electroweak interaction. The Large Hadron Collider (LHC), approved in 1993, would eventually become the world's most powerful particle accelerator.

Beyond CERN, the United States saw the opening of several accelerators during this time. The Stanford Linear Accelerator Center (SLAC) in California hosted two notable projects: the Positron-Electron Project in 1980 and the Stanford Linear Collider in 1989. The latter was instrumental in confirming the existence of the top quark. The Tevatron at Fermilab, which began operations in 1983, also played a pivotal role in particle physics, contributing to the discovery of the top quark and the first evidence of the Higgs boson.

In the former Soviet Union, scientists at Dubna built the Nuclotron, a superconducting synchrotron that opened in 1992. This machine, designed to study heavy ion collisions, was a testament to the continued advancement of particle physics despite geopolitical challenges.

However, not all projects of the era were successful. The U.S. faced setbacks with the cancellation of two proton–proton facilities. The ISABELLE project, which aimed to study the Higgs boson, was terminated in 1983 due to budget constraints and technical difficulties. The Superconducting Super Collider (SSC), a proposed $4 billion project, was also cancelled in 1993 after years of delays and cost overruns. These failures underscored the uncertainties and challenges inherent in large-scale scientific endeavors.

The symposium highlighted the importance of learning from the past to inform the future of particle physics. By examining the triumphs and failures of the 1980s and 1990s, researchers can better understand the complexities of scientific progress. The era's achievements, such as the discovery of the W and Z bosons and the construction of iconic accelerators like the LHC, laid the foundation for modern particle physics. Yet, the challenges faced, including funding issues and technical hurdles, remind scientists of the need for adaptability and resilience in their pursuit of knowledge.

In conclusion, the 4th International Symposium on the History of Particle Physics at CERN provided a unique opportunity to reflect on the past and its lessons for the future. By acknowledging the mistakes and setbacks of the 1980s and 1990s, the scientific community can better navigate the challenges ahead and continue to make groundbreaking discoveries in particle physics. The symposium's emphasis on the unwritten history of the field serves as a reminder that scientific progress is not merely a series of successes, but also a journey marked by perseverance, learning, and adaptation.