Prof. Dr. Valerio Bocci

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Academic Career Length

24Years (2003-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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16 August 2017 in Journal of High Energy Physics

Journal Article

Test of lepton universality with B 0 → K *0 ℓ + ℓ − decays

The LHCb collaboration

R. Aaij

B. Adeva

M. Adinolfi

Z. Ajaltouni

S. Zucchelli

+782

A test of lepton universality, performed by measuring the ratio of the branching fractions of the B ⁰ → K ^*0 μ ⁺ μ ⁻ and B ⁰ → K ^*0 e ⁺ e ⁻ decays, $ {R}_{K^{*0}} $, is presented. The K ^*0 meson is reconstructed in the final state K ⁺ π ⁻, which is required to have an invariant mass within 100 MeV/c ² of the known K ^*(892)⁰ mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of about 3 fb⁻¹, collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The ratio is measured in two regions of the dilepton invariant mass squared, q ², to be $$ {R}_{K^{*0}}=\left\{\begin{array}{l}{0.66_{-}^{+}}_{0.07}^{0.11}\left(\mathrm{stat}\right)\pm 0.03\left(\mathrm{syst}\right)\kern1em \mathrm{f}\mathrm{o}\mathrm{r}\kern1em 0.045<{q}^2<1.1\kern0.5em {\mathrm{GeV}}^2/{c}^4,\hfill \\ {}{0.69_{-}^{+}}_{0.07}^{0.11}\left(\mathrm{stat}\right)\pm 0.05\left(\mathrm{syst}\right)\kern1em \mathrm{f}\mathrm{o}\mathrm{r}\kern1em 1.1<{q}^2<6.0\kern0.5em {\mathrm{GeV}}^2/{c}^4.\hfill \end{array}\right. $$ The corresponding 95.4% confidence level intervals are [0.52, 0.89] and [0.53, 0.94]. The results, which represent the most precise measurements of $ {R}_{K^{*0}} $ to date, are compatible with the Standard Model expectations at the level of 2.1–2.3 and 2.4–2.5 standard deviations in the two q ² regions, respectively. Open image in new window

5 June 2019 in Physical Review Letters

Journal Article

Observation of a Narrow Pentaquark State,

P_{c} (4312)^{+}

, and of the Two-Peak Structure of the

P_{c} (4450)^{+}

R. Aaij

C. Abellán Beteta

B. Adeva

M. Adinolfi

C. A. Aidala

LHCb Collaboration

+862

A narrow pentaquark state,

P_{c} (4312)^{+}

, decaying to

J / ψ p

, is discovered with a statistical significance of

7.3 σ

in a data sample of

Λ_{b}^{0} \to J / ψ p K^{-}

decays, which is an order of magnitude larger than that previously analyzed by the LHCb Collaboration. The

P_{c} (4450)^{+}

pentaquark structure formerly reported by LHCb is confirmed and observed to consist of two narrow overlapping peaks,

P_{c} (4440)^{+}

and

P_{c} (4457)^{+}

, where the statistical significance of this two-peak interpretation is

5.4 σ

. The proximity of the

Σ_{c}^{+} {\bar{D}}^{0}

and

Σ_{c}^{+} {\bar{D}}^{* 0}

thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states.

11 September 2017 in Physical Review Letters

Journal Article

Observation of the Doubly Charmed Baryon

Ξ_{c c}^{+ +}

R. Aaij

B. Adeva

M. Adinolfi

Z. Ajaltouni

S. Akar

LHCb Collaboration

+802

A highly significant structure is observed in the

Λ_{c}^{+} K^{-} π^{+} π^{+}

mass spectrum, where the

Λ_{c}^{+}

baryon is reconstructed in the decay mode

p K^{-} π^{+}

. The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon

Ξ_{c c}^{+ +}

. The difference between the masses of the

Ξ_{c c}^{+ +}

and

Λ_{c}^{+}

states is measured to be

1334.94 \pm 0.72 (stat.) \pm 0.27 (syst .) MeV / c^{2}

, and the

Ξ_{c c}^{+ +}

mass is then determined to be

3621.40 \pm 0.72 (stat.) \pm 0.27 (syst .) \pm 0.14 (Λ_{c}^{+}) MeV / c^{2}

, where the last uncertainty is due to the limited knowledge of the

Λ_{c}^{+}

mass. The state is observed in a sample of proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of

1.7 {fb}^{- 1}

, and confirmed in an additional sample of data collected at 8 TeV.

23 August 2018 in Physical Review Letters

Journal Article

Low-Mass Dark Matter Search with the DarkSide-50 Experiment

P. Agnes

I. F. M. Albuquerque

T. Alexander

A. K. Alton

G. R. Araujo

DarkSide Collaboration

+189

We present the results of a search for dark matter weakly interacting massive particles (WIMPs) in the mass range below

20 GeV / c^{2}

using a target of low-radioactivity argon with a 6786.0 kg d exposure. The data were obtained using the DarkSide-50 apparatus at Laboratori Nazionali del Gran Sasso. The analysis is based on the ionization signal, for which the DarkSide-50 time projection chamber is fully efficient at

0.1 keV ee

. The observed rate in the detector at

0.5 keV ee

is about

1.5 event / keV ee / kg / d

and is almost entirely accounted for by known background sources. We obtain a 90% C.L. exclusion limit above

1.8 GeV / c^{2}

for the spin-independent cross section of dark matter WIMPs on nucleons, extending the exclusion region for dark matter below previous limits in the range

1.8 - 6 GeV / c^{2}

13 May 2019 in Physical Review Letters

Journal Article

Search for Lepton-Universality Violation in

B^{+} \to K^{+} ℓ^{+} ℓ^{-}

Decays

R. Aaij

C. Abellán Beteta

B. Adeva

M. Adinolfi

C. A. Aidala

LHCb Collaboration 1

+842

A measurement of the ratio of branching fractions of the decays

B^{+} \to K^{+} μ^{+} μ^{-}

and

B^{+} \to K^{+} e^{+} e^{-}

is presented. The proton-proton collision data used correspond to an integrated luminosity of

5.0 {fb}^{- 1}

recorded with the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. For the dilepton mass-squared range

1.1 < q^{2} < 6.0 {GeV}^{2} / c^{4}

the ratio of branching fractions is measured to be

R_{K} = 0.84 {6_{- 0.054}^{+ 0.060}}_{- 0.014}^{+ 0.016}

, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of

R_{K}

to date and is compatible with the standard model at the level of 2.5 standard deviations.

29 March 2018 in The European Physical Journal Plus

Journal Article

DarkSide-20k: A 20 tonne two-phase LAr TPC for direct dark matter detection at LNGS

C. E. Aalseth

F. Acerbi

P. Agnes

I. F. M. Albuquerque

T. Alexander

G. Zuzel

+281

About Me

Prof. Dr. Valerio Bocci, born in 1966, graduated in Physics in 1991 from the University of Rome "Tor Vergata" and is a distinguished physicist and senior technologist at the National Institute of Nuclear Physics (INFN). He specializes in electronic instrumentation, data acquisition systems, and particle detectors. As one of the leading designers, his expertise has been pivotal in major particle physics experiments worldwide, including DELPHI, Atlas, and LHCb at CERN, Geneva, KLOE at the National Laboratories of Frascati, and Auger in Argentina. Additionally, his work involves developing detectors for medical physics applications. In academia, Prof. Dr. Bocci holds a professorship in convention with research institutions at the Department of Physics of Sapienza University of Rome. He teaches "Electronics for High Energy Physics" to Ph.D. students and "Solid-State Sensor" to master’s students. His recent projects, focusing on developing compact detectors with advanced sensors and on-chip systems, span various fields, including physics, space instrumentation, molecular biology, and education. His dedication extends to active involvement in outreach activities. Among his notable recognitions, the International Astronomical Union named a meteorite (114611) Valeriobocci in his honor. His project ArduSiPM, selected as one of the top 10 projects at the European Maker Faire, was also presented at the European Parliament, highlighting its significant impact and innovation.

Prof. Dr. Valerio Bocci

Prof. Dr. Valerio Bocci

Research Focus & Metrics

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Representative Publications

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