The world-famous lab cuts ties with a scientist who said women were less able at physics than men.
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By Pallab Ghosh Science correspondent, BBC News
An image shows high-tech machinery in a long array, almost like a very large tube, running through a concrete tunnel, with a staggering array of cables and gleaming industrial machinery connected to the tube Image copyright Reuters Image caption Cern is the home of the Large Hadron Collider - the most powerful particle collider on Earth
The European particle physics research centre Cern has cut ties with the scientist who said that women were less able at physics than men.
Cern has decided not to extend Professor Alessandro Strumia’s status of guest professor.
The decision follows an investigation into comments, first reported by BBC News, made by Prof Strumia at a Cern workshop on gender equality.
Prof Strumia told BBC News that he stood by his remarks.
"Some people hated hearing about higher male variance: this idea comes from Darwin, like other offensive ideas that got observational support," he told BBC News.
"Science is not about being offended when facts challenge ideas held as sacred".
He added that he believed that he had not been fairly treated.
"For months, Cern kept ʼinvestigatingʼ if my 30-minute talk might have violated Cern rules [requiring an] ʼobligation to exercise reserve and tact in expressing personal opinions and communication to the publicʼ," Prof Strumia said.
"In such a case, they would have opened some procedure, where I would have been able [to defend] myself. This never happened."
Last September, Professor Strumia stated that “physics was invented and built by men, itʼs not by invitation" at a presentation at the Cern the workshop.
Image caption Prof Alessandro Strumia is based at Pisa University in Italy
He also showed cartoons deriding women campaigning for equality in science and presented the results of an analysis that he claimed showed that work conducted by female physicists was not as good as their male counterparts.
His analysis was quickly dismissed as being unscientific and incorrect by experts in the impact of research.
But Profesor Strumia told BBC News that his analysis would eventually be proved correct if scientific journals would allow him to publish his research.
"Extra checks confirmed that my results are correct and in line with the specialised literature.
"This will be shown in a scientific paper, if it can appear".
In a statement Cern said: “The incident was investigated in light of the internal Rules and Regulations and the Organisation’s Code of Conduct, which is based on Cern’s core values."
"As a result of its own investigation and following the decision taken by the University of Pisa, Cern decided not to extend Professor Strumia’s status of Guest Professor.”
“Cern reaffirms its commitment to the paramount importance of respect and diversity in the workplace.”
Image caption Prof Strumia claimed there were examples where men were discriminated against
Dr Jessica Wade, a physicist from Imperial College London who was at the workshop where Prof Strumia made his controversial remarks welcomed the decision.
“The recent statement is a powerful message for scientists all over the world; irrespective of your status, you will be held accountable for your actions," she said.
"Well-funded senior academics should not use their positions of power to attack colleagues or demean the work of women."
What was Prof Strumiaʼs argument - and why was it dismissed?
Prof Strumia analysed papers available in a database of particle physics research. He produced a series of graphs which, he claimed, showed that women were hired over men whose research was cited more by other scientists in their publications, which is an indication of higher quality.
He also presented data that he claimed showed that male and female researchers were equally cited at the start of their careers but men scored progressively better as their careers progressed.
This evidence, he said indicated that men produced better research than women. But a group of physicists posted their take on the analysis at particlesforjustice.org and stated that they believed it to be "fundamentally unsound".
They said the correlation was a reflection of the difficulties faced by women in research rather than their abilities. There are many more men in particle physics, and they tend to cite other male colleagues over women. Senior researchers, who are mostly men, often add their names to research conducted by their junior colleagues on the grounds that they supervised the work, although their contribution to the work can often be minimal or non-existent. And disproportionately higher rates of women leave the field.
Those rebutting Prof Stumiaʼs analysis said that "Prof Strumia is not an expert on these topics and is misusing his physics credentials to put himself forward as one. Those among us who are familiar with the relevant literature know that Strumiaʼs conclusions are in stark disagreement with those of experts.
"He frequently made the basic error of conflating correlation with causation, and while Strumia claimed to be proving that there is no discrimination against women, his arguments were rooted in a circumscribed, biased reading of the data available, to the point of promoting a perspective that is biased against women".
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