The Higgs Story-Part 12: How the quarks and leptons acquire masses

In the previous post in this series, we saw how the Higgs mechanism gave rise to the masses of the weak interaction force particles W+, W, and Z. We also saw how the process of spontaneous symmetry breaking that was part of that mechanism resulted in the Higgs field having a non-zero average value even in the vacuum, unlike every other field. (For previous posts in this series, click on the Higgs folder just below the blog post title.) [Read more…]

The Higgs Story-Part 11: The Higgs mechanism

We have finally reached the stage where we can explain the Higgs mechanism.

In part 3 of this series, I said that the complete set of elementary particles consisted of six quarks, six leptons, six ‘gauge bosons’ (particles that are the agents of the four fundamental forces), and the Higgs particle. In part 7, I said that there were patterns among the 18 non-Higgs particles, apart from some anomalies. (For previous posts in this series, click on the Higgs folder just below the blog post title.) [Read more…]

The Science-Religion panel discussion

Last Friday, I participated on the panel that discussed Science and Religion. The room was full (I estimate well over 100 people) showing how much interest there was in this topic amongst students, staff and faculty. It lasted about 75 minutes but many people stayed on afterwards to discuss in small groups. I spent about 90 minutes afterwards talking with some people and it was a lot of fun. What follows is a summary of the discussion and Q/A that focuses mostly on the topics that interested me. [Read more…]

The Higgs Story-Part 10: The non-zero Higgs field in the vacuum

In order to understand the Higgs mechanism, we need to first understand how it came to be that the Higgs field, unlike all the other fields corresponding to the other 18 elementary particles, came to have a non-zero average value in the vacuum. As I said in the previous post in this series, this is the key fact about the Higgs field that leads to it giving mass to the other particles. So how did that come about? [Read more…]

The Higgs Story-Part 8: Gravity and the graviton

Although I will not be talking about the graviton much in this series, it is worthwhile to make a slight detour from the main story line to discuss the role of the gravity force. (For previous posts in this series, click on the Higgs folder just below the blog post title.)

I should point out that unlike with the other force fields, we have not as yet been able to find a way to ‘quantize’ the gravitational field, i.e., find a way to make its particle properties manifest, the way we have been able to do with the theories of the strong, electromagnetic, and weak forces. But despite this, we have been able to make great progress in understanding it. As this article points out, because we have the option of visualizing the behavior of fields using either a particle model or a wave model, we can choose which is the most convenient in any given context, and that has enabled us to overcome the lack of a quantized theory of gravity. [Read more…]

If the obituaries of male scientists were like those of female scientists …

Yvonne Brill died recently. She was a highly respected rocket scientist who received the National Medal of Technology and Innovation in 2011 from president Obama and was noteworthy enough to merit an obituary in the New York Times. Also noteworthy was the fact that the obituary also focused on her sterling qualities as a mother, wife, and cook, as if her ability to combine the mundane duties of everyday life with her scientific work was her main achievement. [Read more…]