I'm a particle physicist at the University of Cambridge working on the LHCb experiment, a huge particle detector buried 100 metres underground at CERN near Geneva. I'm a member of an international team of around 1400 physicists, engineers and computer scientists who are using LHCb to study the basic building blocks of our universe, in search of answers to some of the biggest questions in modern physics.

I also spend a big chunk of my time trying to share my love of physics with the public. I've just finished my first popular science book, How To Make An Apple Pie From Scratch, which will be published in August 2021. From 2012 to 2018 I held a joint post between Cambridge and the Science Museum in London, where I curated two major exhibitions: Collider (2013) and The Sun (2018). I particularly enjoy talking about science in person and have given a large number of public talks, including at TED and the Royal Institution, alongside appearances on television, radio and podcasts.


I'm part of a large international team working on the LHCb Experiment at the Large Hadron Collider. LHCb is searching for signs of new particles that could help us understand some of the big unsolved problems in fundamental physics including the nature of dark matter and why the universe is made of matter and not antimatter. 

I study B-mesons, which are exotic particles containing a bottom quark. These particles are produced in huge numbers by the Large Hadron Collider and recorded in exquisite detail by the LHCb detector.


I'm particularly interested in ultra-rare decays of these particles, which can be affected by new particles or forces that lie outside our current best theory, the Standard Model. By making precise measurements of these decays and comparing to what the Standard Model predicts, my colleagues and I hope to find the first signs of something altogether new. 

How to make an apple pie from scratch Harry Cliff Doubleday cover

My first (hopefully) popular science book, How To Make An Apple Pie From Scratch, is coming out this August, published by Doubleday in the USA and Picador in the UK. It tells the story of one of humankind's most exciting intellectual journeys: the search for origin of matter. In the book I explore how physicists, astronomers and cosmologists uncovered the basic building blocks of matter and traced their origins through the hearts of dying stars and back to the Big Bang. It's also a reflection on where we stand after an exciting yet perplexing decade at the Large Hadron Collider, and where the next big breakthroughs in our understanding of matter may come from.

Oh, and, it's all told through the hopefully reassuring narrative device of searching for the ultimate apple pie recipe. Why an apple pie? Well...

If you wish to make an apple pie from scratch, you must first invent the universe

Carl Sagan

How to make an apple pie from scratch Harry Cliff Doubleday cover

I love talking about physics, particularly in front of a live audience. Get in touch if you'd like me to talk at your event, institution or school. I give a lot of public talks and lectures and have even tried my hand at standup comedy. There are some recent highlights below, and if you like this sort of thing you can find more on my YouTube channel.


In December 2015 I was invited to speak at TED Global. My talk, titled 'Have we reached the end of physics?' (short answer, definitely not) covered the Large Hadron Collider, what we still don't understand and where particle physics might be going. It has now been viewed over 2 million times.


For the past few years I've taught a lecture course, 'An Introduction to Particle Physics', at the Royal Institution in London. The course proved very popular and I've now repeated it three times and was asked to give an advanced course for the die-hard particle physics fans. Keep an eye on the RI site for news of future courses.


I've recently given talks at a number of festivals including  Kaleidoscope and Gravity Fields in 2018, the World Science Festival, Brisbane in 2017 and Wilderness in 2016. Some have been pretty straight science talks, others a bit more silly, as you can probably judge from the image below...


Here are a few examples of me in action. You can find more on my YouTube channel.






If you'd like to get in touch, just message me with your details using the form below and I'll get back to you.

  • @harryvcliff

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