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Beyond the Standard Models
How credible are CKM matrix limits on new physics?
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[QUOTE="ohwilleke, post: 6063461, member: 19562"] A[URL='https://arxiv.org/abs/1710.09644'] pre-print[/URL] of a conference paper from eleven months ago analyzes the extent to which the available data on the CKM matrix element values rules out beyond the Standard Model Physics. It finds that in the most rigid model dependent analysis, that new physics are excluded up to a characteristic energy scale of about 500,000 TeV. There is no practical way that a human designed experiment could reach these energy scales from an engineering perspective. These are energy scales that haven't existed anywhere in the Universe since the early moments of the Big Bang. If the assumptions of the model are relaxed, new physics are still excluded up to a characteristic energy scale of 114 TeV. This would take an accelerator on the order of ten times as powerful as the LHC or more to test. To allow for new physics at a characteristic energy scale of 11 TeV which is the highest that there is a realistic chance that could be discovered at the LHC, one would have to abandon assumptions that are almost certainly correct based upon the available experimental evidence. These limits are much more strict than the energy scale limitations established by direct searches for new particles at the LHC. So, if this analysis of correct, the likelihood that we can experimentally observe any new physics that could tweak the parameters of the CKM matrix is dim indeed. But, how credible is this analysis? What loopholes remain for "relatively" low energy new beyond the Standard Model physics? The paper is: [SIZE=6][B][URL='https://arxiv.org/pdf/1710.09644.pdf']Unitarity Triangle Analysis in the Standard Model and Beyond[/URL][/B][/SIZE] [URL='https://arxiv.org/search/hep-ph?searchtype=author&query=Alpigiani%2C+C']Cristiano Alpigiani[/URL], [URL='https://arxiv.org/search/hep-ph?searchtype=author&query=Bevan%2C+A']Adrian Bevan[/URL], [URL='https://arxiv.org/search/hep-ph?searchtype=author&query=Bona%2C+M']Marcella Bona[/URL], [URL='https://arxiv.org/search/hep-ph?searchtype=author&query=Ciuchini%2C+M']Marco Ciuchini[/URL], [URL='https://arxiv.org/search/hep-ph?searchtype=author&query=Derkach%2C+D']Denis Derkach[/URL], [URL='https://arxiv.org/search/hep-ph?searchtype=author&query=Franco%2C+E']Enrico Franco[/URL], [URL='https://arxiv.org/search/hep-ph?searchtype=author&query=Lubicz%2C+V']Vittorio Lubicz[/URL], [URL='https://arxiv.org/search/hep-ph?searchtype=author&query=Martinelli%2C+G']Guido Martinelli[/URL], [URL='https://arxiv.org/search/hep-ph?searchtype=author&query=Parodi%2C+F']Fabrizio Parodi[/URL],[URL='https://arxiv.org/search/hep-ph?searchtype=author&query=Pierini%2C+M']Maurizio Pierini[/URL], [URL='https://arxiv.org/search/hep-ph?searchtype=author&query=Silvestrini%2C+L']Luca Silvestrini[/URL], [URL='https://arxiv.org/search/hep-ph?searchtype=author&query=Sordini%2C+V']Viola Sordini[/URL], [URL='https://arxiv.org/search/hep-ph?searchtype=author&query=Stocchi%2C+A']Achille Stocchi[/URL], [URL='https://arxiv.org/search/hep-ph?searchtype=author&query=Tarantino%2C+C']Cecilia Tarantino[/URL], [URL='https://arxiv.org/search/hep-ph?searchtype=author&query=Vagnoni%2C+V']Vincenzo Vagnoni[/URL] (Submitted on 26 Oct 2017 ([URL='https://arxiv.org/abs/1710.09644v1']v1[/URL]), last revised 27 Oct 2017 (this version, v2)) The pertinent language from the conclusion of the paper is as follows: [/QUOTE]
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How credible are CKM matrix limits on new physics?
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