arXiv subjects

C. A. Aidala

Publications and source records attributed to C. A. Aidala.

446 records · Page 25Linked to original sources

arXiv2018

Angular moments of the decay $Λ_b^0 \rightarrow Λμ^{+} μ^{-}$ at low hadronic recoil

An analysis of the angular distribution of the decay $Λ_b^0 \rightarrow Λμ^{+} μ^{-}$ is presented, using data collected with the LHCb detector between 2011 and 2016 and corresponding to an integrated luminosity of approximately $5\,fb^{-1}$. Angular observables are determined using a moment analysis of the angular distribution at low hadronic recoil, corresponding to the dimuon invariant mass squared range $15 < q^{2} < 20\, GeV^2/c^4$. The full basis of observables is measured for the first time. The lepton-side, hadron-side and combined forward-backward asymmetries of the decay are determined to be \begin{align} A_{FB}^{l} & = -0.39 \pm 0.04\,\rm{stat} \pm 0.01\, \rm{syst}, \nonumber\\ A_{FB}^{h} & = -0.30 \pm 0.05\,\rm{stat} \pm 0.02\, \rm{syst}, \nonumber\\ A_{FB}^{lh} & = +0.25 \pm 0.04\,\rm{stat} \pm 0.01\, \rm{syst}. \nonumber \end{align} The measurements are consistent with Standard Model predictions.

hep-ex↗

arXiv2018

Observation of two resonances in the $Λ_b^0 π^\pm$ systems and precise measurement of $Σ_b^\pm$ and $Σ_b^{*\pm}$ properties

The first observation of two structures consistent with resonances in the final states $Λ_b^0 π^-$ and $Λ_b^0 π^+$ is reported using samples of $pp$ collision data collected by the LHCb experiment at $\sqrt{s} = 7$ and $8$ TeV, corresponding to an integrated luminosity of 3 $\mathrm{fb}^{-1}$. The ground states $Σ_b^\pm$ and $Σ_b^{*\pm}$ are also confirmed and their masses and widths are precisely measured.

hep-ex↗

arXiv2018

Measurement of $Z\rightarrowτ^+τ^-$ production in proton-proton collisions at $\sqrt{s} = 8$ TeV

A measurement of $Z\rightarrowτ^+τ^-$ production cross-section is presented using data, corresponding to an integrated luminosity of 2 fb$^{-1}$, from $pp$ collisions at $\sqrt{s}=8$ TeV collected by the LHCb experiment. The $τ^+τ^-$ candidates are reconstructed in final states with the first tau lepton decaying leptonically, and the second decaying either leptonically or to one or three charged hadrons. The production cross-section is measured for $Z$ bosons with invariant mass between 60 and 120 GeV/$c^2$, which decay to tau leptons with transverse momenta greater than 20 GeV/$c$ and pseudorapidities between 2.0 and 4.5. The cross-section is determined to be $σ_{pp\rightarrow{}Z\rightarrow{}τ^+τ^-} = 95.8 \pm 2.1 \pm 4.6 \pm 0.2 \pm 1.1 \mathrm{pb}$, where the first uncertainty is statistical, the second is systematic, the third is due to the LHC beam energy uncertainty, and the fourth to the integrated luminosity uncertainty. This result is compatible with NNLO Standard model predictions. The ratio of the cross-sections for $Z\rightarrowτ^+τ^-$ to $Z\rightarrowμ^+μ^-$ ($Z\rightarrow{}e^+e^-$), determined to be $1.01 \pm 0.05$ ($1.02 \pm 0.06$), is consistent with the lepton-universality hypothesis in $Z$ decays.

hep-ex↗

arXiv2018

Observation of the decay $Λ^0_b\rightarrowψ(2S)pπ^-$

The Cabibbo-suppressed decay $Λ^0_b\rightarrowψ(2S)pπ^-$ is observed for the first time using a data sample collected by the LHCb experiment in proton-proton collisions corresponding to 1.0, 2.0 and 1.9fb$^{-1}$ of integrated luminosity at centre-of-mass energies of 7, 8 and 13TeV, respectively. The $ψ(2S)$ mesons are reconstructed in the $μ^+μ^-$ final state. The~branching fraction with respect to that of the $Λ^0_b\rightarrowψ(2S)pK^-$ decay mode is measured to be $$\frac{\mathcal{B}\left(Λ^0_b\rightarrowψ(2S)pπ^- \right)} {\mathcal{B}\left(Λ^0_b\rightarrowψ(2S)pK^-\right)}=\left(11.4 \pm 1.3 \pm 0.2\right)\!\%\,,$$ where the first uncertainty is statistical and the second is systematic. The $ψ(2S)p$ and $ψ(2S)π^-$ mass spectra are investigated and no evidence for exotic resonances is found.

hep-ex↗

arXiv2018

Measurement of the CKM angle $γ$ using $B^\pm\to DK^\pm$ with $D\to K_\text{S}^0π^+π^-$, $K_\text{S}^0K^+K^-$ decays

A binned Dalitz plot analysis of $B^\pm \to D K^\pm$ decays, with $D\to K_\text{S}^0π^+π^-$ and $D\to K_\text{S}^0K^+K^-$, is used to perform a measurement of the CP-violating observables $x_{\pm}$ and $y_{\pm}$, which are sensitive to the Cabibbo-Kobayashi-Maskawa angle $γ$. The analysis is performed without assuming any $D$ decay model, through the use of information on the strong-phase variation over the Dalitz plot from the CLEO collaboration. Using a sample of proton-proton collision data collected with the LHCb experiment in 2015 and 2016, and corresponding to an integrated luminosity of 2.0$\,\text{fb}^{-1}$, the values of the CP violation parameters are found to be $x_- = ( 9.0 \pm 1.7 \pm 0.7 \pm 0.4) \times 10^{-2}$, $y_- = ( 2.1 \pm 2.2 \pm 0.5 \pm 1.1) \times 10^{-2}$, $x_+ = (- 7.7 \pm 1.9 \pm 0.7 \pm 0.4) \times 10^{-2}$, and $y_+ = (- 1.0 \pm 1.9 \pm 0.4 \pm 0.9) \times 10^{-2}$. The first uncertainty is statistical, the second is systematic, and the third is due to the uncertainty on the strong-phase measurements. These values are used to obtain $γ= \left(87\,^{+11}_{-12}\right)^\circ$, $r_B = 0.086^{+ 0.013}_{-0.014}$, and $δ_B = (101 \pm 11)^\circ$, where $r_B$ is the ratio between the suppressed and favoured $B$-decay amplitudes and $δ_B$ is the corresponding strong-interaction phase difference. This measurement is combined with the result obtained using 2011 and 2012 data collected with the \lhcb experiment, to give $γ= \left(80\,^{+10}_{\,-9}\right)^\circ$, $r_B = 0.080 \pm 0.011$, and $δ_B = (110 \pm 10)^\circ$.

hep-ex↗

arXiv2018

Observation of the decay $\overline{B_s^0} \rightarrow χ_{c2} K^+ K^- $ in the $φ$ mass region

The $\overline{B_s^0} \rightarrow χ_{c2} K^+ K^- $ decay mode is observed and its branching fraction relative to the corresponding $χ_{c1}$ decay mode, in a $\pm 15 \textrm{MeV}/c^2$ window around the $ϕ$ mass, is found to be $\frac{\mathcal{B}(\overline{B_s^0} \rightarrow χ_{c2} K^+ K^-) }{ \mathcal{B}(\overline{B_s^0} \rightarrow χ_{c1} K^+ K^-)} = (17.1 \pm 3.1 \pm 0.4 \pm 0.9)\%,$ where the first uncertainty is statistical, the second systematic and the third due to the knowledge of the branching fractions of radiative $χ_c$ decays. The decay mode $\overline{B_s^0} \rightarrow χ_{c1} K^+ K^- $ allows the $ B_s^0$ mass to be measured as $m(B_s^0) = 5366.83 \pm 0.25 \pm 0.27 \, \textrm{MeV}/c^2,$ where the first uncertainty is statistical and the second systematic. A combination of this result with other LHCb determinations of the $B_s^0$ mass is made.

hep-ex↗

arXiv2018

Measurement of angular and CP asymmetries in $D^0\toπ^+π^-μ^+μ^-$ and $D^0\to K^+K^-μ^+μ^-$ decays

The first measurements of the forward-backward asymmetry of the dimuon pair ($A_{FB}$), the triple-product asymmetry ($A_{2ϕ}$), and the charge-parity-conjugation asymmetry ($A_{CP}$), in $D^0\toπ^+π^-μ^+μ^-$ and $D^0\to K^+K^-μ^+μ^-$ decays are reported. They are performed using data from proton-proton collisions collected with the LHCb experiment from 2011 to 2016, corresponding to a total integrated luminosity of 5 fb$^{-1}$. The asymmetries are measured to be \begin{align*} A_{FB}(D^0\toπ^+π^-μ^+μ^-) &= (\phantom{-}3.3\pm3.7\pm0.6)\%,\\ A_{2ϕ}(D^0\toπ^+π^-μ^+μ^-)&= (-0.6\pm3.7\pm0.6)\%,\\ A_{CP}(D^0\toπ^+π^-μ^+μ^-) &= (\phantom{-}4.9\pm3.8\pm0.7)\%,\\ A_{FB}(D^0\to K^+K^-μ^+μ^-) &= (0\pm11\pm2)\%,\\ A_{2ϕ}(D^0\to K^+K^-μ^+μ^-)&= (9\pm11\pm1)\%,\\ A_{CP}(D^0\to K^+K^-μ^+μ^-) &= (0\pm11\pm2)\%, \end{align*} where the first uncertainty is statistical and the second systematic. The asymmetries are also measured as a function of the dimuon invariant mass. The results are consistent with the Standard Model predictions.

hep-ex↗

arXiv2018

Measurement of the $Ω_c^0$ baryon lifetime

We report a measurement of the lifetime of the $Ω_c^0$ baryon using proton-proton collision data at center-of-mass energies of 7 and 8~TeV, corresponding to an integrated luminosity of 3.0 fb$^{-1}$ collected by the LHCb experiment. The sample consists of about 1000 $Ω_b^-\toΩ_c^0μ^-\barν_μ X$ signal decays, where the $Ω_c^0$ baryon is detected in the $pK^-K^-π^+$ final state and $X$ represents possible additional undetected particles in the decay. The $Ω_c^0$ lifetime is measured to be $τ_{Ω_c^0} = 268\pm24\pm10\pm2$ fs, where the uncertainties are statistical, systematic, and from the uncertainty in the $D^+$ lifetime, respectively. This value is nearly four times larger than, and inconsistent with, the current world-average value.

hep-ex↗

arXiv2018

Observation of a new $Ξ_b^-$ resonance

From samples of $pp$ collision data collected by the LHCb experiment at $\sqrt{s}=7$, $8$ and $13$ TeV corresponding to integrated luminosities of 1.0, 2.0 and 1.5 fb$^{-1}$, respectively, a peak in both the $Λ_b^0K^-$ and $Ξ_b^0π^-$ invariant mass spectra is observed. In the quark model, radially and orbitally excited $Ξ_b^-$ resonances with quark content $bds$ are expected. Referring to this peak as $Ξ_b(6227)^-$, the mass and natural width are measured to be $m_{Ξ_{b}(6227)^-}=6226.9\pm2.0\pm0.3\pm0.2$ MeV/$c^2$ and $Γ_{Ξ_b(6227)^-}=18.1\pm5.4\pm1.8$ MeV/$c^2$, where the first uncertainty is statistical, the second is systematic, and the third, on $m_{Ξ_b(6227)^-}$, is due to the knowledge of the $Λ_b^0$ baryon mass. Relative production rates of the ${Ξ_b(6227)^-\toΛ_b^0K^-}$ and ${Ξ_b(6227)^-\toΞ_b^0π^-}$ decays are also reported.

hep-ex↗

arXiv2018

Measurement of the lifetime of the doubly charmed baryon $Ξ_{cc}^{++}$

The first measurement of the lifetime of the doubly charmed baryon $Ξ_{cc}^{++}$ is presented, with the signal reconstructed in the final state $Λ_c^+ K^- π^+ π^+$. The data sample used corresponds to an integrated luminosity of $1.7\,\mathrm{fb}^{-1}$, collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of $13\mathrm{\,Te\kern -0.1em V}$. The $Ξ_{cc}^{++}$ lifetime is measured to be $0.256\,^{+0.024}_{-0.022}{\,\rm (stat)\,} \pm 0.014 {\,\rm(syst)}\mathrm{\,ps}$.

hep-ex↗

arXiv2014

Limits on TMD Evolution From Semi-Inclusive Deep Inelastic Scattering at Moderate $Q$

In the QCD evolution of transverse momentum dependent parton distribution and fragmentation functions, the Collins-Soper evolution kernel includes both a perturbative short-distance contribution as well as a large-distance non-perturbative, but strongly universal, contribution. In the past, global fits, based mainly on larger $Q$ Drell-Yan-like processes, have found substantial contributions from non-perturbative regions in the Collins-Soper evolution kernel. In this article, we investigate semi-inclusive deep inelastic scattering measurements in the region of relatively small $Q$, of the order of a few GeV, where sensitivity to non-perturbative transverse momentum dependence may become more important or even dominate the evolution. Using recently available deep inelastic scattering data from the COMPASS experiment, we provide estimates of the regions of coordinate space that dominate in TMD processes when the hard scale is of the order of only a few GeV. We find that distance scales that are much larger than those commonly probed in large $Q$ measurements become important, suggesting that the details of non-perturbative effects in TMD evolution are especially significant in the region of intermediate $Q$. We highlight the strongly universal nature of the non-perturbative component of evolution, and its potential to be tightly constrained by fits from a wide variety of observables that include both large and moderate $Q$. On this basis, we recommend detailed treatments of the non-perturbative component of the Collins-Soper evolution kernel for future TMD studies.

hep-ph↗

arXiv2013

One 4-Twist Helix Snake to Maintain Polarization in 8-120 GeV Proton Rings

Solenoid Siberian snakes have successfully maintained polarization in particle rings below 1 GeV, but never in multi-GeV rings because the Lorentz contraction of a solenoid's integral B dl would require impractically long high-field solenoids. High energy rings, such as Brookhaven's 255 GeV Relativistic Heavy Ion Collider (RHIC), use only odd multiples of pairs of transverse B-field Siberian snakes directly opposite each other. When it became impractical to use a pair of Siberian Snakes in Fermilab's 120 GeV Main Injector, we searched for a new type of single Siberian snake, which should overcome all depolarizing resonances in the 8.9 - 120 GeV range. We found that one snake made of one 4-twist helix and 2 short dipoles could maintain the polarization. This snake design might also be used at other rings, such as Japan's 30 GeV J-PARC, the 12 - 24 GeV NICA proton-deuteron collider at JINR-Dubna, and perhaps RHIC's injector, the 25 GeV AGS.

physics.acc-ph↗

arXiv2010

Global Analysis of Fragmentation Functions for Eta Mesons

Fragmentation functions for eta mesons are extracted at next-to-leading order accuracy of QCD in a global analysis of data taken in electron-positron annihilation and proton-proton scattering experiments. The obtained parametrization is in good agreement with all data sets analyzed and can be utilized, for instance, in future studies of double-spin asymmetries for single-inclusive eta production. The Lagrange multiplier technique is used to estimate the uncertainties of the fragmentation functions and to assess the role of the different data sets in constraining them.

hep-ph↗

arXiv2008

Peering Into Hadronic Matter: The Electron-Ion Collider

A unique new facility, capable of colliding beams of electrons with a wide range of nuclei as well as polarized protons and light ions, has been proposed to study the role of gluons in matter and perform precision mapping of the structure of nucleons and nuclei. The physics prospects of the proposed Electron-Ion Collider (EIC) are discussed.

nucl-ex↗