Probes of Lepton Flavor Universality in <i>b</i> → <i>u</i> Transitions

Anomalies recently observed in semileptonic <inline-formula> <math display="inline"> <semantics> <mrow> <mi>b</mi> <mo>→</mo> <mi>c</mi> <msup> <mi>ℓ</mi> <mo>-</mo> </msup> <msub&g...

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Main Authors:	Pietro Colangelo, Fulvia De Fazio, Francesco Loparco
Format:	Article
Language:	English
Published:	MDPI AG 2020-02-01
Series:	Particles
Subjects:	lepton flavour universality semileptonic b decays
Online Access:	https://www.mdpi.com/2571-712X/3/1/12

id	doaj-a89b7a5967144db7ac3df6a075529435
record_format	Article
spelling	doaj-a89b7a5967144db7ac3df6a0755294352020-11-25T00:31:47ZengMDPI AGParticles2571-712X2020-02-013114516310.3390/particles3010012particles3010012Probes of Lepton Flavor Universality in <i>b</i> → <i>u</i> TransitionsPietro Colangelo0Fulvia De Fazio1Francesco Loparco2Istituto Nazionale di Fisica Nucleare - Sezione di Bari, via Orabona 4, 70126 Bari, ItalyIstituto Nazionale di Fisica Nucleare - Sezione di Bari, via Orabona 4, 70126 Bari, ItalyIstituto Nazionale di Fisica Nucleare - Sezione di Bari, via Orabona 4, 70126 Bari, ItalyAnomalies recently observed in semileptonic <inline-formula> <math display="inline"> <semantics> <mrow> <mi>b</mi> <mo>→</mo> <mi>c</mi> <msup> <mi>ℓ</mi> <mo>-</mo> </msup> <msub> <mover accent="true"> <mi>ν</mi> <mo>¯</mo> </mover> <mi>ℓ</mi> </msub> </mrow> </semantics> </math> </inline-formula> and <inline-formula> <math display="inline"> <semantics> <mrow> <mi>b</mi> <mo>→</mo> <mi>s</mi> <msup> <mi>ℓ</mi> <mo>+</mo> </msup> <msup> <mi>ℓ</mi> <mo>-</mo> </msup> </mrow> </semantics> </math> </inline-formula> transitions point to violation of Lepton Flavour Universality. Strategies for new analyses of different modes are required, in particular for the modes induced by the <inline-formula> <math display="inline"> <semantics> <mrow> <mi>b</mi> <mo>→</mo> <mi>u</mi> </mrow> </semantics> </math> </inline-formula> transition. We describe the purely leptonic <i>B</i> decay, the <inline-formula> <math display="inline"> <semantics> <mrow> <mover accent="true"> <mi>B</mi> <mo>¯</mo> </mover> <mo>→</mo> <mi>π</mi> <msup> <mi>ℓ</mi> <mo>-</mo> </msup> <msub> <mover accent="true"> <mi>ν</mi> <mo>¯</mo> </mover> <mi>ℓ</mi> </msub> </mrow> </semantics> </math> </inline-formula> channel and the <i>B</i> semileptonic modes to <inline-formula> <math display="inline"> <semantics> <mrow> <mi>ρ</mi> <mo>(</mo> <mn>770</mn> <mo>)</mo> </mrow> </semantics> </math> </inline-formula> and <inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mi>a</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mn>1260</mn> <mo>)</mo> </mrow> </mrow> </semantics> </math> </inline-formula> in extensions of the Standard Model involving Lepton Flavour Universality violating <inline-formula> <math display="inline"> <semantics> <mrow> <mi>b</mi> <mo>→</mo> <mi>u</mi> </mrow> </semantics> </math> </inline-formula> operators. In particular, we review the observables in the four-dimensional angular <inline-formula> <math display="inline"> <semantics> <mrow> <mover accent="true"> <mi>B</mi> <mo>¯</mo> </mover> <mo>→</mo> <mi>ρ</mi> <mrow> <mo>(</mo> <mi>π</mi> <mi>π</mi> <mo>)</mo> </mrow> <msup> <mi>ℓ</mi> <mo>-</mo> </msup> <msub> <mover accent="true"> <mi>ν</mi> <mo>¯</mo> </mover> <mi>ℓ</mi> </msub> </mrow> </semantics> </math> </inline-formula> and <inline-formula> <math display="inline"> <semantics> <mrow> <mover accent="true"> <mi>B</mi> <mo>¯</mo> </mover> <mo>→</mo> <msub> <mi>a</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>ρ</mi> <mi>π</mi> <mo>)</mo> </mrow> <msup> <mi>ℓ</mi> <mo>-</mo> </msup> <msub> <mover accent="true"> <mi>ν</mi> <mo>¯</mo> </mover> <mi>ℓ</mi> </msub> </mrow> </semantics> </math> </inline-formula> distributions, suitable to pin down deviations from the Standard Model. We discuss the complementarity among the various modes for New Physics searches.https://www.mdpi.com/2571-712X/3/1/12lepton flavour universalitysemileptonic b decays
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Pietro Colangelo Fulvia De Fazio Francesco Loparco
spellingShingle	Pietro Colangelo Fulvia De Fazio Francesco Loparco Probes of Lepton Flavor Universality in <i>b</i> → <i>u</i> Transitions Particles lepton flavour universality semileptonic b decays
author_facet	Pietro Colangelo Fulvia De Fazio Francesco Loparco
author_sort	Pietro Colangelo
title	Probes of Lepton Flavor Universality in <i>b</i> → <i>u</i> Transitions
title_short	Probes of Lepton Flavor Universality in <i>b</i> → <i>u</i> Transitions
title_full	Probes of Lepton Flavor Universality in <i>b</i> → <i>u</i> Transitions
title_fullStr	Probes of Lepton Flavor Universality in <i>b</i> → <i>u</i> Transitions
title_full_unstemmed	Probes of Lepton Flavor Universality in <i>b</i> → <i>u</i> Transitions
title_sort	probes of lepton flavor universality in <i>b</i> → <i>u</i> transitions
publisher	MDPI AG
series	Particles
issn	2571-712X
publishDate	2020-02-01
description	Anomalies recently observed in semileptonic <inline-formula> <math display="inline"> <semantics> <mrow> <mi>b</mi> <mo>→</mo> <mi>c</mi> <msup> <mi>ℓ</mi> <mo>-</mo> </msup> <msub> <mover accent="true"> <mi>ν</mi> <mo>¯</mo> </mover> <mi>ℓ</mi> </msub> </mrow> </semantics> </math> </inline-formula> and <inline-formula> <math display="inline"> <semantics> <mrow> <mi>b</mi> <mo>→</mo> <mi>s</mi> <msup> <mi>ℓ</mi> <mo>+</mo> </msup> <msup> <mi>ℓ</mi> <mo>-</mo> </msup> </mrow> </semantics> </math> </inline-formula> transitions point to violation of Lepton Flavour Universality. Strategies for new analyses of different modes are required, in particular for the modes induced by the <inline-formula> <math display="inline"> <semantics> <mrow> <mi>b</mi> <mo>→</mo> <mi>u</mi> </mrow> </semantics> </math> </inline-formula> transition. We describe the purely leptonic <i>B</i> decay, the <inline-formula> <math display="inline"> <semantics> <mrow> <mover accent="true"> <mi>B</mi> <mo>¯</mo> </mover> <mo>→</mo> <mi>π</mi> <msup> <mi>ℓ</mi> <mo>-</mo> </msup> <msub> <mover accent="true"> <mi>ν</mi> <mo>¯</mo> </mover> <mi>ℓ</mi> </msub> </mrow> </semantics> </math> </inline-formula> channel and the <i>B</i> semileptonic modes to <inline-formula> <math display="inline"> <semantics> <mrow> <mi>ρ</mi> <mo>(</mo> <mn>770</mn> <mo>)</mo> </mrow> </semantics> </math> </inline-formula> and <inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mi>a</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mn>1260</mn> <mo>)</mo> </mrow> </mrow> </semantics> </math> </inline-formula> in extensions of the Standard Model involving Lepton Flavour Universality violating <inline-formula> <math display="inline"> <semantics> <mrow> <mi>b</mi> <mo>→</mo> <mi>u</mi> </mrow> </semantics> </math> </inline-formula> operators. In particular, we review the observables in the four-dimensional angular <inline-formula> <math display="inline"> <semantics> <mrow> <mover accent="true"> <mi>B</mi> <mo>¯</mo> </mover> <mo>→</mo> <mi>ρ</mi> <mrow> <mo>(</mo> <mi>π</mi> <mi>π</mi> <mo>)</mo> </mrow> <msup> <mi>ℓ</mi> <mo>-</mo> </msup> <msub> <mover accent="true"> <mi>ν</mi> <mo>¯</mo> </mover> <mi>ℓ</mi> </msub> </mrow> </semantics> </math> </inline-formula> and <inline-formula> <math display="inline"> <semantics> <mrow> <mover accent="true"> <mi>B</mi> <mo>¯</mo> </mover> <mo>→</mo> <msub> <mi>a</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>ρ</mi> <mi>π</mi> <mo>)</mo> </mrow> <msup> <mi>ℓ</mi> <mo>-</mo> </msup> <msub> <mover accent="true"> <mi>ν</mi> <mo>¯</mo> </mover> <mi>ℓ</mi> </msub> </mrow> </semantics> </math> </inline-formula> distributions, suitable to pin down deviations from the Standard Model. We discuss the complementarity among the various modes for New Physics searches.
topic	lepton flavour universality semileptonic b decays
url	https://www.mdpi.com/2571-712X/3/1/12
work_keys_str_mv	AT pietrocolangelo probesofleptonflavoruniversalityinibiiuitransitions AT fulviadefazio probesofleptonflavoruniversalityinibiiuitransitions AT francescoloparco probesofleptonflavoruniversalityinibiiuitransitions
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Probes of Lepton Flavor Universality in <i>b</i> → <i>u</i> Transitions

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