Letter Search for baryogenesis and dark matter in B+ → Λc+ +invisible decays

Lees, JP and Poireau, V and Tisserand, V and Grauges, E and Palano, A and Eigen, G and Brown, DN and Kolomensky, YG and Fritsch, M and Koch, H and Cheaib, R and Hearty, C and Mattison, TS and McKenna, JA and So, RY and Blinov, VE and Buzykaev, AR and Druzhinin, VP and Kozyrev, EA and Kravchenko, EA and Serednyakov, SI and Skovpen, YI and Solodov, EP and Todyshev, KY and Lankford, AJ and Dey, B and Gary, JW and Long, O and Eisner, AM and Lockman, WS and Panduro Vazquez, W and Chao, DS and Cheng, CH and Echenard, B and Flood, KT and Hitlin, DG and Li, Y and Lin, DX and Middleton, S and Miyashita, TS and Ongmongkolkul, P and Oyang, J and Porter, FC and Röhrken, M and Meadows, BT and Sokoloff, MD and Smith, JG and Wagner, SR and Bernard, D and Verderi, M and Bettoni, D and Bozzi, C and Calabrese, R and Cibinetto, G and Fioravanti, E and Garzia, I and Luppi, E and Santoro, V and Calcaterra, A and De Sangro, R and Finocchiaro, G and Martellotti, S and Patteri, P and Peruzzi, IM and Piccolo, M and Rotondo, M and Zallo, A and Passaggio, S and Patrignani, C and Shuve, BJ and Lacker, HM and Bhuyan, B and Mallik, U and Chen, C and Cochran, J and Prell, S and Gritsan, AV and Arnaud, N and Davier, M and Le Diberder, F and Lutz, AM and Wormser, G and Lange, DJ and Wright, DM and Coleman, JP and Hutchcroft, DE and Payne, DJ and Touramanis, C and Bevan, AJ and Bona, M and Di Lodovico, F and Cowan, G and Banerjee, S and Brown, DN and Davis, CL and Denig, AG and Gradl, W and Griessinger, K and Hafner, A and Schubert, KR (2025) Letter Search for baryogenesis and dark matter in B+ → Λc+ +invisible decays. Physical Review D, 111 (3). pp. 1-6. ISSN 2470-0010 DOI: https://doi.org/10.1103/PhysRevD.111.L031101

Abstract

A mechanism of baryogenesis and dark matter production via B meson oscillations and decays has recently been proposed to explain the observed dark matter abundance and matter-antimatter asymmetry in the universe. This mechanism introduces a low-mass dark sector particle (ψD) with a nonzero baryonic charge. We present a search for this new state in B+→Λc+ψD decays using data collected at the ϒ(4S) resonance by the BABAR detector at SLAC, corresponding to an integrated luminosity of 431.0 fb-1. The search leverages the full reconstruction of the B- meson in ϒ(4S)→B+B- decays, accompanied by the reconstruction of a Λc+, to infer the presence of ψD. No significant signal is observed, and limits on the B+→Λc+ψD branching fraction are set at the level of 1.6×10-4 at 90% confidence level for 0.94<mψD<2.99 GeV. These results set strong constraints on the parameter space allowed by B-meson baryogenesis.

Divisions:	Carnegie School of Sport
Identification Number:	https://doi.org/10.1103/PhysRevD.111.L031101
Status:	Published
Refereed:	Yes
SWORD Depositor:	Symplectic
Depositing User (symplectic)	Deposited by Mann, Elizabeth
Date Deposited:	18 Mar 2025 16:00
Last Modified:	22 Apr 2025 20:06
Item Type:	Article