arXiv subjects

A. Bursche

Publications and source records attributed to A. Bursche.

At least 127 records · Page 7Linked to original sources

arXiv2016

Measurement of forward $W$ and $Z$ boson production in $pp$ collisions at $\sqrt{s} = 8\mathrm{\,Te\kern -0.1em V}$

Measurements are presented of electroweak boson production using data from $pp$ collisions at a centre-of-mass energy of $\sqrt{s} = 8\mathrm{\,Te\kern -0.1em V}$. The analysis is based on an integrated luminosity of $2.0\mathrm{\,fb}^{-1}$ recorded with the LHCb detector. The bosons are identified in the $W\rightarrowμν$ and $Z\rightarrowμ^{+}μ^{-}$ decay channels. The cross-sections are measured for muons in the pseudorapidity range $2.0 < η< 4.5$, with transverse momenta $p_{\rm T} > 20{\mathrm{\,Ge\kern -0.1em V\!/}c}$ and, in the case of the $Z$ boson, a dimuon mass within $60 < M_{μ^{+}μ^{-}} < 120{\mathrm{\,Ge\kern -0.1em V\!/}c^{2}}$. The results are \begin{align*} σ_{W^{+}\rightarrowμ^{+}ν} &= 1093.6 \pm 2.1 \pm 7.2 \pm 10.9 \pm 12.7{\rm \,pb} \, , σ_{W^{-}\rightarrowμ^{-}\barν} &= \phantom{0}818.4 \pm 1.9 \pm 5.0 \pm \phantom{0}7.0 \pm \phantom{0}9.5{\rm \,pb} \, , σ_{Z\rightarrowμ^{+}μ^{-}} &= \phantom{00}95.0 \pm 0.3 \pm 0.7 \pm \phantom{0}1.1 \pm \phantom{0}1.1{\rm \,pb} \, , \end{align*} where the first uncertainties are statistical, the second are systematic, the third are due to the knowledge of the LHC beam energy and the fourth are due to the luminosity determination. The evolution of the $W$ and $Z$ boson cross-sections with centre-of-mass energy is studied using previously reported measurements with $1.0\mathrm{\,fb}^{-1}$ of data at $7\mathrm{\,Te\kern -0.1em V}$. Differential distributions are also presented. Results are in good agreement with theoretical predictions at next-to-next-to-leading order in perturbative quantum chromodynamics.

hep-ex↗

arXiv2016

Study of $ψ(2S)$ production and cold nuclear matter effects in pPb collisions at $\sqrt{s_{NN}}=5~\mathrm{TeV}$

The production of $ψ(2S)$ mesons is studied in dimuon final states using proton-lead collision data collected by the LHCb detector. The data sample corresponds to an integrated luminosity of $1.6~\mathrm{nb}^{-1}$. The nucleon-nucleon centre-of-mass energy of the proton-lead collisions is $\sqrt{s_{NN}}=5~\mathrm{TeV}$. The measurement is performed using $ψ(2S)$ mesons with transverse momentum less than $14~\mathrm{GeV}/c$ and rapidity $y$ in the ranges $1.5<y<4.0$ and $-5.0<y<-2.5$ in the nucleon-nucleon centre-of-mass system. The forward-backward production ratio and the nuclear modification factor are determined for $ψ(2S)$ mesons. Using the production cross-section results of $ψ(2S)$ and $J/ψ$ mesons from $b$-hadron decays, the $b\bar{b}$ cross-section in pPb collisions at $\sqrt{s_{NN}}=5~\mathrm{TeV}$ is obtained.

nucl-ex↗

arXiv2016

Search for the lepton-flavour violating decay $D^0 \to e^\pmμ^\mp$

A search for the lepton-flavour violating decay $D^0 \to e^\pm μ^\mp$ is made with a dataset corresponding to an integrated luminosity of 3.0 fb$^{-1}$ of proton-proton collisions at centre-of-mass energies of $7$ TeV and $8$ TeV, collected by the LHCb experiment. Candidate $D^0$ mesons are selected using the decay $D^{*+} \to D^0 π^+$ and the $D^0 \to e^\pm μ^\mp$ branching fraction is measured using the decay mode $D^0 \to K^-π^+$ as a normalisation channel. No significant excess of $D^0 \to e^\pm μ^\mp$ candidates over the expected background is seen, and a limit is set on the branching fraction, $\mathcal{B}(D^0 \to e^\pm μ^\mp) < 1.3 \times 10^{-8}$, at 90 % confidence level. This is an order of magnitude lower than the previous limit and it further constrains the parameter space in some leptoquark models and in supersymmetric models with R-parity violation.

hep-ex↗

arXiv2016

Study of the production of $Λ_b^0$ and $\overline{B}^0$ hadrons in $pp$ collisions and first measurement of the $Λ_b^0\rightarrow J/ψpK^-$ branching fraction

The product of the $Λ_b^0$ ($\overline{B}^0$) differential production cross-section and the branching fraction of the decay $Λ_b^0\rightarrow J/ψpK^-$ ($\overline{B}^0\rightarrow J/ψ\overline{K}^*(892)^0$) is measured as a function of the beauty hadron transverse momentum, $p_{\rm T}$, and rapidity, $y$. The kinematic region of the measurements is $p_{\rm T}<20~{\rm GeV}/c$ and $2.0<y<4.5$. The measurements use a data sample corresponding to an integrated luminosity of $3~{\rm fb}^{-1}$ collected by the LHCb detector in $pp$ collisions at centre-of-mass energies $\sqrt{s}=7~{\rm TeV}$ in 2011 and $\sqrt{s}=8~{\rm TeV}$ in 2012. Based on previous LHCb results of the fragmentation fraction ratio, $f_{Λ_B^0}/f_d$, the branching fraction of the decay $Λ_b^0\rightarrow J/ψpK^-$ is measured to be \begin{equation*} \mathcal{B}(Λ_b^0\rightarrow J/ψpK^-)= (3.17\pm0.04\pm0.07\pm0.34^{+0.45}_{-0.28})\times10^{-4}, \end{equation*} where the first uncertainty is statistical, the second is systematic, the third is due to the uncertainty on the branching fraction of the decay $\overline{B}^0\rightarrow J/ψ\overline{K}^*(892)^0$, and the fourth is due to the knowledge of $f_{Λ_b^0}/f_d$. The sum of the asymmetries in the production and decay between $Λ_b^0$ and $\overlineΛ_b^0$ is also measured as a function of $p_{\rm T}$ and $y$. The previously published branching fraction of $Λ_b^0\rightarrow J/ψpπ^-$, relative to that of $Λ_b^0\rightarrow J/ψpK^-$, is updated. The branching fractions of $Λ_b^0\rightarrow P_c^+(\rightarrow J/ψp)K^-$ are determined.

hep-ex↗

arXiv2016

First observation of the decay $B_{s}^{0} \to K_{S}^{0} K^{*}(892)^{0}$

A search for $B_{(s)}^{0} \to K_{S}^{0} K^{*}(892)^{0}$ decays is performed using $pp$ collision data, corresponding to an integrated luminosity of $1.0~\text{fb}^{-1}$, collected with the LHCb detector at a centre-of-mass energy of $7~\text{TeV}$. The $B_{s}^{0} \to K_{S}^{0} K^{*}(892)^{0}$ decay is observed for the first time, with a significance of 7.1 standard deviations. The branching fraction is measured to be \begin{equation*} \mathcal{B}(B_{s}^{0} \to \bar{K}^{0} K^{*}(892)^{0}) + \mathcal{B}(B_{s}^{0} \to K^{0} \bar{K}^{*}(892)^{0}) = (16.4 \pm 3.4 \pm 2.3) \times 10^{-6},\\ \end{equation*} where the first uncertainty is statistical and the second is systematic. No evidence is found for the decay $B^{0} \to K_{S}^{0} K^{*}(892)^{0}$ and an upper limit is set on the branching fraction, $\mathcal{B}(B^{0} \to \bar{K}^{0} K^{*}(892)^{0}) + \mathcal{B}(B^{0} \to K^{0} \bar{K}^{*}(892)^{0}) < 0.96 \ \times 10^{-6}, $ at $90\,\% $ confidence level. All results are consistent with Standard Model predictions.

hep-ex↗

arXiv2015

Study of $B^{-}\to DK^-π^+π^-$ and $B^-\to Dπ^-π^+π^-$ decays and determination of the CKM angle $γ$

We report a study of the suppressed $B^-\to DK^-π^+π^-$ and favored $B^-\to Dπ^-π^+π^-$ decays, where the neutral $D$ meson is detected through its decays to the $K^{\mp}π^{\pm}$ and CP-even $K^+K^-$ and $π^+π^-$ final states. The measurement is carried out using a proton-proton collision data sample collected by the LHCb experiment, corresponding to an integrated luminosity of 3.0~fb$^{-1}$. We observe the first significant signals in the CP-even final states of the $D$ meson for both the suppressed $B^-\to DK^-π^+π^-$ and favored $B^-\to Dπ^-π^+π^-$ modes, as well as in the doubly Cabibbo-suppressed $D\to K^+π^-$ final state of the $B^-\to Dπ^-π^+π^-$ decay. Evidence for the ADS suppressed decay $B^{-}\to DK^-π^+π^-$, with $D\to K^+π^-$, is also presented. From the observed yields in the $B^-\to DK^-π^+π^-$, $B^-\to Dπ^-π^+π^-$ and their charge conjugate decay modes, we measure the value of the weak phase to be $γ=(74^{+20}_{-19})^{\rm o}$. This is one of the most precise single-measurement determinations of $γ$ to date.

hep-ex↗

arXiv2015

Measurement of the forward-backward asymmetry in $Z/γ^{\ast} \rightarrow μ^{+}μ^{-}$ decays and determination of the effective weak mixing angle

The forward-backward charge asymmetry for the process $q\bar{q} \rightarrow Z/γ^{\ast} \rightarrow μ^{+}μ^{-}$ is measured as a function of the invariant mass of the dimuon system. Measurements are performed using proton proton collision data collected with the LHCb detector at $\sqrt{s} = 7$ and 8\tev, corresponding to integrated luminosities of $1$fb$^{-1}$ and $2$fb$^{-1}$ respectively. Within the Standard Model the results constrain the effective electroweak mixing angle to be $$sin^{2}θ_{W}^{eff} = 0.23142 \pm 0.00073 \pm 0.00052 \pm 0.00056 $$ where the first uncertainty is statistical, the second systematic and the third theoretical. This result is in agreement with the current world average, and is one of the most precise determinations at hadron colliders to date.

hep-ex↗

arXiv2015

Evidence for the strangeness-changing weak decay $Ξ_b^-\toΛ_b^0π^-$

Using a $pp$ collision data sample corresponding to an integrated luminosity of 3.0~fb$^{-1}$, collected by the LHCb detector, we present the first search for the strangeness-changing weak decay $Ξ_b^-\toΛ_b^0π^-$. No $b$ hadron decay of this type has been seen before. A signal for this decay, corresponding to a significance of 3.2 standard deviations, is reported. The relative rate is measured to be ${f_{Ξ_b^-}\over{f_{Λ_b^0}}}{\cal{B}}(Ξ_b^-\toΛ_b^0π^-) = (5.7\pm1.8^{+0.8}_{-0.9})\times10^{-4}$, where $f_{Ξ_b^-}$ and $f_{Λ_b^0}$ are the $b\toΞ_b^-$ and $b\toΛ_b^0$ fragmentation fractions, and ${\cal{B}}(Ξ_b^-\toΛ_b^0π^-)$ is the branching fraction. Assuming $f_{Ξ_b^-}/f_{Λ_b^0}$ is bounded between 0.1 and 0.3, the branching fraction ${\cal{B}}(Ξ_b^-\toΛ_b^0π^-)$ would lie in the range from $(0.57\pm0.21)\%$ to $(0.19\pm0.07)\%$.

hep-ex↗

arXiv2015

Search for the rare decays $B^{0}\to J/ψγ$ and $B^{0}_{s} \to J/ψγ$

A search for the rare decay of a $B^{0}$ or $B^{0}_{s}$ meson into the final state $J/ψγ$ is performed, using data collected by the LHCb experiment in $pp$ collisions at $\sqrt{s}=7$ and $8$ TeV, corresponding to an integrated luminosity of 3 fb$^{-1}$. The observed number of signal candidates is consistent with a background-only hypothesis. Branching fraction values larger than $1.7\times 10^{-6}$ for the $B^{0}\to J/ψγ$ decay mode are excluded at 90% confidence level. For the $B^{0}_{s}\to J/ψγ$ decay mode, branching fraction values larger than $7.4\times 10^{-6}$ are excluded at 90% confidence level, this is the first branching fraction limit for this decay.

hep-ex↗

arXiv2015

Forward production of $Υ$ mesons in $pp$ collisions at $\sqrt{s}=7$ and 8TeV

The production of $Υ$ mesons in $pp$ collisions at $\sqrt=7$ and $8\,\mathrm{TeV}$ is studied with the LHCb detector using data samples corresponding to an integrated luminosity of $1\,\mathrm{fb}^{-1}$ and $2\,\mathrm{fb}^{-1}$ respectively. The production cross-sections and ratios of cross-sections are measured as functions of the meson transverse momentum $p_T$ and rapidity $y$, for $p_T<30\,\mathrm{GeV}/c$} and $2.0<y<4.5$.

hep-ex↗

arXiv2015

Observation of the $B^0_s\toη'η'$ decay

The first observation of the $B^0_s\toη'η'$ decay is reported. The study is based on a sample of proton-proton collisions corresponding to $3.0$ ${\rm fb^{-1}}$ of integrated luminosity collected with the LHCb detector. The significance of the signal is $6.4$ standard deviations. The branching fraction is measured to be $[3.31 \pm 0.64\,{\rm (stat)} \pm 0.28\,{\rm (syst)} \pm 0.12\,{\rm (norm)}]\times10^{-5}$, where the third uncertainty comes from the $B^{\pm}\toη' K^{\pm}$ branching fraction that is used as a normalisation. In addition, the charge asymmetries of $B^{\pm}\toη' K^{\pm}$ and $B^{\pm}\toϕK^{\pm}$, which are control channels, are measured to be $(-0.2 \pm1.3)\%$ and $(+1.7\pm1.3)\%$, respectively. All results are consistent with theoretical expectations.

hep-ex↗

arXiv2015

Measurement of ${C\!P}$ violation parameters and polarisation fractions in ${B_s^0\to J/ψ\overline{K}^{*0}}$ decays

The first measurement of ${C\!P}$ asymmetries in the decay ${B_s^0\to J/ψ\overline{K}^{*}(892)^{0}}$ and an updated measurement of its branching fraction and polarisation fractions are presented. The results are obtained using data corresponding to an integrated luminosity of $3.0\,fb^{-1}$ of proton-proton collisions recorded with the LHCb detector at centre-of-mass energies of $7$ and $8\,\mathrm{TeV}$. Together with constraints from ${B^0\to J/ψρ^0}$, the results are used to constrain additional contributions due to penguin diagrams in the ${C\!P}$-violating phase ${ϕ_{s}}$, measured through ${B_s^0}$ decays to charmonium.

hep-ex↗

arXiv2015

Search for the $Λ_b \rightarrow Λη^\prime$ and $Λ_b \rightarrow Λη$ decays with the LHCb detector

A search is performed for the as yet unobserved baryonic $Λ_b \rightarrow Λη^\prime$ and $Λ_b \rightarrow Λη$ decays with 3$fb^{-1}$ of proton-proton collision data recorded by the LHCb experiment. The $B^0 \rightarrow K_S^0 η^\prime$ decay is used as a normalisation channel. No significant signal is observed for the $Λ_b \rightarrow Λη^\prime$ decay. An upper limit is found on the branching fraction of $\mathcal{B}(Λ_b \rightarrow Λη^\prime)<3.1\times10^{-6}$} at 90\% confidence level. Evidence is seen for the presence of the $Λ_b \rightarrow Λη$ decay at the level of $3σ$ significance, with a branching fraction $\mathcal{B}(Λ_b \rightarrow Λη)=(9.3^{+7.3}_{-5.3})\times10^{-6}$}.

hep-ex↗

arXiv2015

Observation of the decay $\overline{B}_s^0 \rightarrow ψ(2S) K^+ π^-$

The decay $\overline{B}_s^0 \rightarrow ψ(2S) K^+ π^-$ is observed using a data set corresponding to an integrated luminosity of $3.0fb^{-1}$ collected by the LHCb experiment in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV. The branching fraction relative to the $B^0\rightarrow ψ(2S) K^+ π^-$ decay mode is measured to be \begin{equation} \frac{{\cal B}(\overline{B}^0_s \rightarrow ψ(2S) K^+ π^-)}{{\cal B}(B^0 \rightarrow ψ(2S) K^+ π^-)} = 5.38 \pm 0.36 (stat) \pm 0.22 (syst) \pm 0.31 \, (f_s/f_d) \, \%,\nonumber \end{equation} where $f_s/f_d$ indicates the uncertainty due to the ratio of probabilities for a $b$ quark to hadronise into a $B_s^0$ or $B^0$ meson. Using an amplitude analysis, the fraction of decays proceeding via an intermediate $K^*(892)^0$ meson is measured to be $0.645 \pm 0.049 (stat) \pm 0.049 (syst)$ and its longitudinal polarisation fraction is $0.524 \pm 0.056 (stat) \pm 0.029 (syst)$. The relative branching fraction for this component is determined to be \begin{equation} \frac{{\cal B}(\overline{B}^0_s \rightarrow ψ(2S) K^*(892)^0)}{{\cal B}(B^0 \rightarrow ψ(2S) K^*(892)^0)} = 5.58 \pm 0.57 (stat) \pm 0.40 (syst) \pm 0.32 \, (f_s/f_d) \, \%. \nonumber \end{equation} In addition, the mass splitting between the $B_s^0$ and $B^0$ mesons is measured as \begin{equation} M(B^0_s) - M(B^0) = 87.45 \pm 0.44 (stat) \pm 0.07 (syst) MeV/c^2. \nonumber \end{equation}

hep-ex↗

arXiv2015

Measurement of the branching fraction ratio $\mathcal{B}(B_c^+ \rightarrow ψ(2S)π^+)/\mathcal{B}(B_c^+ \rightarrow J/ψπ^+)$

Using $pp$ collision data collected by LHCb at center-of-mass energies $\sqrt{s}$ = 7 TeV and 8 TeV, corresponding to an integrated luminosity of 3 fb$^{-1}$, the ratio of the branching fraction of the $B_c^+ \rightarrow ψ(2S)π^+$ decay relative to that of the $B_c^+ \rightarrow J/ψπ^+$ decay is measured to be 0.268 $\pm$ 0.032 (stat) $\pm$ 0.007 (syst) $\pm$ 0.006 (BF). The first uncertainty is statistical, the second is systematic, and the third is due to the uncertainties on the branching fractions of the $J/ψ\rightarrow μ^+μ^-$ and $ψ(2S) \rightarrow μ^+μ^-$ decays. This measurement is consistent with the previous LHCb result, and the statistical uncertainty is halved.

hep-ex↗

arXiv2015

Measurement of the time-integrated $CP$ asymmetry in $D^0 \to K^0_S K^0_S$ decays

The time-integrated $CP$ asymmetry in the decay $D^0 \to K^0_S K^0_S$ is measured using $3 fb^{-1}$ of proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The flavour of the $D^0$ meson is determined by use of the decay $D^{*+} \to D^0 π^+$ and its charge conjugate mode. The result is \[ {\cal A}_{CP} = -0.029 \pm 0.052 \pm 0.022, \] where the first uncertainty is statistical and the second systematic. The result is consistent with Standard Model expectations and improves the uncertainty with respect to the only previous measurement of this quantity by more than a factor of three.

hep-ex↗

arXiv2015

Search for hidden-sector bosons in $B^0 \!\to K^{*0}μ^+μ^-$ decays

A search is presented for hidden-sector bosons, $χ$, produced in the decay ${B^0\!\to K^*(892)^0χ}$, with $K^*(892)^0\!\to K^{+}π^{-}$ and $χ\!\toμ^+μ^-$. The search is performed using $pp$-collision data corresponding to 3.0 fb$^{-1}$ collected with the LHCb detector. No significant signal is observed in the accessible mass range $214 \leq m(χ) \leq 4350$ MeV, and upper limits are placed on the branching fraction product $\mathcal{B}(B^0\!\to K^*(892)^0χ)\times\mathcal{B}(χ\!\toμ^+μ^-)$ as a function of the mass and lifetime of the $χ$ boson. These limits are of the order of $10^{-9}$ for $χ$ lifetimes less than 100 ps over most of the $m(χ)$ range, and place the most stringent constraints to date on many theories that predict the existence of additional low-mass bosons.

hep-ex↗

arXiv2015

Measurement of the $B_s^0 \to ϕϕ$ branching fraction and search for the decay $B^0 \to ϕϕ$

Using a dataset corresponding to an integrated luminosity of 3.0 fb$^{-1}$ collected in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV, the $B_s^0 \to ϕϕ$ branching fraction is measured to be \[ \mathcal{B}(B_s^0 \to ϕϕ) = ( 1.84 \pm 0.05 (\text{stat}) \pm 0.07 (\text{syst}) \pm 0.11 (f_s/f_d) \pm 0.12 (\text{norm}) ) \times 10^{-5}, \] where $f_s/f_d$ represents the ratio of the $B_s^0$ to $B^0$ production cross-sections, and the $B^0 \to ϕK^*(892)^0$ decay mode is used for normalization. This is the most precise measurement of this branching fraction to date, representing a factor five reduction in the statistical uncertainty compared with the previous best measurement. A search for the decay $B^0 \to ϕϕ$ is also made. No signal is observed, and an upper limit on the branching fraction is set as \[ \mathcal{B}(B^0 \to ϕϕ) < 2.8 \times 10^{-8} \] at 90% confidence level. This is a factor of seven improvement compared to the previous best limit.

hep-ex↗